IO Tools:
Free online developer tools including JSON formatter, text compare, hash generator, Base64 encoder, URL parser, and more. With 342+ tools across 12 categories, IO Tools helps you quickly format, convert, encode, and work with data directly in your browser. Most tools run locally for speed and privacy, and most tool inputs are not stored on our servers. Some features that require storage (for example, Quick Paste) store data only to provide that feature. Built to keep useful tools simple, fast, and all in one place - dmlub2Ro
Text and Content
25 tools
Text Compare
Compare text line-by-line and word-by-word with fast difference navigation.
Diff Patch Tool
Parse unified diff and preview patch application on source text with hunk validation.
Text Case Converter
Switch between upper, lower, title, sentence, snake, camel, and more.
Word Counter
Count words online instantly with reading time and unique-word metrics.
Letter Counter
Count letters online with uppercase, lowercase, space, and symbol totals.
HTML Editor
Edit and preview HTML online in-browser with simple and advanced modes.
HTML Minifier
Minify and prettify HTML markup online for cleaner readable source.
CSS Minifier
Minify and beautify CSS stylesheets online for fast optimization.
Markdown Editor
Write Markdown and see live HTML preview with clean formatted output.
SQL Formatter
Format SQL queries for readability with keyword and indentation controls.
Regex Tester
Test regular expressions and inspect match results quickly.
Text Statistics
Analyze words, characters, lines, and reading time instantly.
Line Tools
Trim, sort, deduplicate, and clean multiline text quickly.
Text Replacer
Find and replace text with regex and case-sensitive controls.
Lorem Ipsum Generator
Generate clean placeholder paragraphs for design and testing.
Text Deduplicator Online Tool
Remove duplicate lines or words with flexible matching.
Keyword Density Analyzer
Analyze word frequency and keyword density from text blocks.
Reading Time Estimator
Estimate reading and speaking time from text content.
N-Gram Extractor
Extract frequent n-grams from text input quickly.
Regex Explainer
Explain regex tokens and test match behavior.
Text Similarity Checker
Compare two texts and compute token similarity metrics.
Readability Studio
Analyze readability with Flesch and grade-level metrics.
Markdown Outline Extractor
Extract heading outline from markdown documents.
Text Redactor
Redact sensitive data like email, phone, IP, and URLs.
Unicode Inspector
Inspect code points, bytes, and character metrics in text.
Developer and Data
49 tools
JSON Formatter and Validator
Validate, format, and minify JSON with clear error feedback.
JSON and CSV Converter
Convert JSON to CSV and CSV to JSON for import and export workflows.
XML Formatter and Validator
Validate, format, and minify XML content quickly.
XML JSON Converter
Convert XML to JSON and JSON to XML with clean structured output.
YAML Formatter and Validator
Validate, format, and minify YAML content for configuration and API workflows.
YAML JSON Converter
Convert YAML to JSON and JSON to YAML instantly with readable output.
JSONPath Tester
Evaluate JSONPath expressions against JSON data and inspect matched results.
XPath Tester
Run XPath queries on XML input and inspect element, attribute, and text matches.
Semver Comparator and Range Evaluator
Compare semantic versions and test version ranges with clear pass/fail output.
Number Base Converter
Convert numbers across binary, octal, decimal, hex, and base-36.
URL Parser
Parse URL components including query parameters in one view.
HTTP Status Lookup
Find HTTP status codes quickly with meaning and category details.
MIME Type Lookup
Look up MIME types by extension or find common extensions from MIME values.
IPv6 Tools
Expand, compress, and validate IPv6 addresses for network diagnostics.
User Agent Parser
Parse user agent strings into browser, OS, device, and engine details.
IP Viewer
View detected client IP, IP version, and forwarding headers instantly.
IP Lookup Tool
Look up IP or hostname with address resolution, reverse DNS, and geo/network metadata.
DNS Lookup Tool
Query A, AAAA, CNAME, MX, TXT, and NS DNS records from one interface.
IPv4 Subnet Calculator
Calculate network address, subnet mask, broadcast, and host range from IPv4 CIDR.
CIDR to Range
Convert IPv4 CIDR notation to full start/end range and usable host boundaries.
IP to Decimal Converter
Convert IPv4 addresses to decimal and decimal values back to IPv4 instantly.
Color Converter
Convert colors between HEX, RGB, and HSL with live preview.
CSV Formatter
Validate and format CSV with delimiter support for cleaner tabular data.
Unit Converter
Convert length, weight, temperature, and digital storage values quickly.
JSON Key Extractor Online Tool
Extract nested JSON key paths and flatten object structures.
CSV Column Selector Online Tool
Select, reorder, or remove CSV columns by name or index.
JSON Diff
Compare JSON objects and arrays and list exact key-path differences quickly.
XML Diff
Compare XML documents and detect meaningful content differences line by line.
YAML Diff
Compare YAML text inputs and identify changed, added, or removed lines.
cURL Generator
Generate cURL commands from method, URL, headers, and request body values.
JSON Schema Generator
Generate JSON schema structures from sample JSON payloads.
CSV to XML Converter
Convert CSV table data into XML with configurable root/item names.
INI Parser
Parse INI config files to JSON for debugging and migration tasks.
CSV Profiler
Profile CSV columns for type, empties, and uniqueness.
JSON Flattener
Flatten nested JSON objects into path-key maps.
DNS Zone Parser
Parse DNS zone files into structured record summaries.
Markdown Table Builder
Build Markdown tables from CSV/TSV input quickly.
HTML Table Extractor
Extract table rows from HTML into CSV or TSV.
JSON Schema Sample Generator
Generate sample JSON payload from JSON schema.
Access Log Parser
Parse web access logs and summarize traffic patterns.
Email Header Parser
Parse raw email headers and summarize key fields.
HTTP Request Parser
Parse raw HTTP requests into structured JSON.
HTTP Response Parser
Parse raw HTTP responses into structured JSON.
CSV Random Sampler
Sample random rows from CSV input quickly.
Domain Extractor
Extract domains from mixed text and URL lists.
JSON Lines Merger
Merge JSON lines (JSONL/NDJSON) into a JSON array.
JSON Pointer Evaluator
Evaluate RFC 6901 JSON Pointer paths against JSON data.
JSON Merge Patch Tool
Apply RFC 7396 merge patch documents to JSON.
INI Overlay Merger
Merge base and overlay INI files with override behavior.
Encoding and Security
25 tools
Base64 Encode and Decode
Encode and decode UTF-8 text using Base64 safely in browser.
Base32 Base58 Base58Check Converter
Convert text and bytes between Base32, Base58, and Base58Check with checksum validation.
URL Encoder and Decoder
Convert URL components between readable and encoded forms.
HTML Encoder and Decoder
Encode and decode HTML entities safely for markup and debugging.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes.
SHA256 Generator
Generate SHA-256 hashes quickly for integrity checks.
HMAC Generator
Generate keyed HMAC signatures with SHA-256, SHA-384, and SHA-512.
Password Strength Checker
Evaluate password quality with practical security feedback.
Unicode Converter
Convert plain text to Unicode escape sequences and decode back instantly.
JWT Decoder
Decode JWT header and payload locally without sending data out.
JWT Encoder
Create signed HS256 JWT tokens locally from JSON payload and secret.
JWT Verifier
Verify JWT signatures for HS, RS, and ES algorithms using secret, PEM key, or JWKS.
PEM X.509 Certificate Decoder
Decode PEM and X.509 certificate details including issuer, subject, validity, SAN, and key metadata.
Secure Compare Tool Online
Compare two values safely with optional normalization.
Password Policy Tester
Test passwords against configurable policy rules including length, case, digits, and symbols.
Password Entropy Calculator
Calculate entropy bits and strength level for passwords.
TOTP Generator
Generate time-based OTP codes from Base32 secret keys.
Webhook Signature Verifier
Verify webhook signatures using HMAC algorithms.
PBKDF2 Key Generator
Derive secure keys from passwords using PBKDF2.
AES GCM Encrypt Decrypt
Encrypt and decrypt text using AES-GCM locally.
CRC32 Checksum Calculator
Calculate CRC32 checksum values for text input.
JWT Timeline Inspector
Inspect JWT timeline claims like iat, nbf, and exp.
Cookie Parser
Parse Cookie header values into key-value pairs.
Set Cookie Parser
Parse Set-Cookie headers into structured attributes.
Base64 Inspector
Decode Base64 and inspect bytes, text preview, and JSON payloads.
Generators
13 tools
UUID Generator
Generate single or bulk UUID v4 values instantly.
UUID v7 and ULID Generator
Generate sortable UUID v7 and ULID identifiers with secure randomness.
Password Generator
Create strong random passwords with configurable character sets.
Random String Generator
Generate random strings for tokens, placeholders, and test data.
Passphrase Generator
Generate memorable multi-word passphrases for stronger account security.
Nano ID Generator
Generate compact secure nano IDs with custom alphabet and length.
Username Generator
Generate multiple username ideas with style and number options.
QR Code Generator
Generate QR codes for text and URLs with size, error correction, and color controls.
QR Code Decoder
Decode QR payloads from uploaded images directly in your browser.
Barcode Generator
Generate CODE128, EAN13, UPC, and ITF14 barcodes with configurable dimensions.
Data Matrix and Aztec Generator
Generate Data Matrix or Aztec 2D codes for compact payload encoding.
QR Style Tool
Create styled QR visuals with shape and color customization.
UUID Validator
Validate UUID values by version and format and check input batches quickly.
Productivity and Files
43 tools
Quick Paste
Create secure shareable snippet links with expiry and optional password protection.
Image Format Converter
Convert images between PNG, JPG, and WEBP in-browser with quality controls.
Image Resizer
Resize image dimensions with aspect-ratio controls and export-ready output.
Image Compressor
Compress images with quality, resize, and output format controls directly in browser.
Background Remover
Remove image backgrounds in-browser and export transparent results quickly.
Bulk Image Compressor
Compress multiple images together and download optimized output as files or ZIP.
HEIC to JPG PNG Converter
Convert HEIC and HEIF photos to JPG or PNG directly in your browser.
AVIF WEBP Converter
Convert AVIF and WEBP files between modern and common image formats.
EXIF Metadata Remover
Strip image metadata by re-encoding pixels for safer sharing.
Image to PDF Converter
Convert one or multiple image files into a single PDF in browser.
PDF Compressor
Compress PDF files using fast rewrite mode or stronger raster mode with quality controls.
PDF Watermark
Add text watermarks to PDF pages with opacity, position, and rotation controls.
PDF Protect Password Tool
Apply password protection to PDF files directly in-browser.
PDF Unlock Tool
Unlock password-protected PDFs using the known password and save unlocked output.
PDF Rotate Reorder Pages
Rotate page ranges and reorder PDF pages in one processing step.
PDF Extract Delete Pages
Extract selected pages or delete chosen pages from PDF files.
PDF Merge and Split Tool
Merge multiple PDFs or split selected page ranges from a PDF file.
PDF to Images Converter
Render PDF pages into PNG or JPEG files with range and scale controls.
Image to Text Converter
Extract text from image files with browser-based OCR and quick TXT export.
PDF to Text Converter
Run OCR on scanned PDF pages and export recognized text in plain text format.
Make PDF Searchable
Add a hidden text layer to scanned PDFs to enable search and copy actions.
Screenshot to Text Converter
Paste or upload screenshots and convert visible text to editable plain text.
Handwriting to Text Converter (Beta)
Convert handwritten notes to editable text. Results depend on writing clarity and image quality.
PDF to Word Converter
Convert PDF text content into downloadable DOCX files with page grouping.
Word to PDF Converter
Convert DOCX text content to PDF in-browser for quick sharing and printing.
Image to Searchable PDF
Create searchable PDFs from one or multiple images with OCR text overlays.
Multi-page Text Export
Process multiple images and PDFs in one run, then export combined extracted text as TXT or DOCX.
Timestamp Converter
Convert Unix timestamps to readable dates and back.
Cron Expression Parser
Parse cron schedules with readable explanations and upcoming run times.
Date Difference Calculator
Calculate time difference between two dates with human-friendly breakdown.
Timezone Converter and Meeting Planner
Convert times across IANA zones and rank meeting slots by business-hour overlap.
Age Calculator
Calculate exact age in years, months, and days with next birthday details.
Online Notes
Create and edit shared notes by link with custom IDs and real-time sync.
Loan Calculator
Calculate monthly payments, total interest, and payoff estimates for loans.
Percentage Calculator
Calculate percent change, percent of value, and increase/decrease scenarios instantly.
Business Days Calculator
Count business days between dates with configurable weekend inclusion.
Merge PDF Online
Merge multiple PDF files into one document online.
Cron Expression Visualizer
Visualize upcoming run times from cron expressions.
Color Palette Generator
Generate color palettes from a base color quickly.
CSS Gradient Generator
Generate CSS linear gradients and preview output instantly.
Range List Tool
Compress number lists into ranges or expand ranges to numbers.
Date Range Generator
Generate date/time series with custom step intervals.
List Set Operations
Compute intersection, union, and differences between lists.
Finance and Business
17 tools
EMI Loan Calculator
Calculate monthly EMI, total repayment, and total interest for fixed-rate loans.
Loan Amortization Calculator
Generate month-wise amortization schedule with optional extra monthly payment.
Simple and Compound Interest Calculator
Calculate maturity value using simple or compound interest methods.
NPV Calculator
Compute net present value from initial investment, discount rate, and cash-flow series.
IRR Calculator
Estimate internal rate of return from initial investment and periodic cash flows.
Depreciation Calculator
Calculate straight-line or declining-balance depreciation schedule.
Profit Margin Calculator
Calculate profit, margin percentage, and markup percentage from cost and selling price.
GST and VAT Calculator
Add or remove GST/VAT from an amount based on tax rate.
Invoice Total Calculator
Calculate invoice grand total with discount, tax, and shipping components.
Payroll Take-home Calculator
Estimate monthly take-home pay after taxes, social contribution, and fixed deductions.
SIP Calculator
Estimate mutual fund SIP maturity value from monthly contribution, return, and tenure.
CAGR Calculator
Calculate compound annual growth rate between starting and ending investment value.
Inflation Impact Calculator
See how inflation reduces purchasing power and future value over time.
Discount and Sale Price Calculator
Find discount amount, final sale price, and effective savings percentage.
Payback Period Calculator
Estimate time needed to recover initial investment from annual cash flows.
Retirement Corpus Calculator
Estimate required retirement corpus from expenses, inflation, and post-retirement return.
Fixed Deposit Maturity Calculator
Calculate fixed deposit maturity value with compounding frequency and interest rate.
Electronics and Embedded
25 tools
Ohm's Law Calculator
Compute voltage, current, or resistance from any two known values.
Power Calculator
Calculate electrical power using V*I, I^2*R, or V^2/R formulas.
Resistor Color Code Decoder
Decode 4-band resistor value and tolerance from selected color bands.
LED Resistor Calculator
Calculate required series resistor and resistor wattage for LED circuits.
Voltage Divider Calculator
Calculate output voltage and divider current for two-resistor divider networks.
RC Time Constant Calculator
Calculate RC time constant tau and approximate settling time.
Capacitor Charge and Discharge Calculator
Compute capacitor voltage at a given time during charge or discharge.
555 Timer Calculator
Calculate astable frequency/duty or monostable pulse width for 555 timer circuits.
ADC and DAC Converter Calculator
Calculate ADC code from analog input and DAC output from digital code.
PWM Duty and Frequency Calculator
Convert between period/on-time and frequency/duty cycle representations.
Motor Full Load Current Calculator
Estimate motor full-load current from power, voltage, power factor, and efficiency.
Power Factor Correction Calculator
Calculate required capacitor bank size to improve power factor.
Short Circuit Current Estimator
Estimate transformer-based short-circuit current from rating and impedance.
UPS Battery Backup Time Calculator
Estimate UPS backup duration from battery voltage, capacity, load, and efficiency.
Cable Conduit Fill Calculator
Estimate cable count inside conduit from diameters and fill percentage.
Signal Attenuation dB Calculator
Calculate attenuation in dB from input and output power values.
Transformer Sizing Calculator
Estimate transformer kVA and full-load current from connected load, power factor, and utilization.
Cable Tray Fill Calculator
Estimate allowable cable count and fill percentage for rectangular cable trays.
Earthing Grid Resistance Estimator
Estimate grounding resistance from grid and rod parameters using simplified equations.
Harmonic Distortion THD Calculator
Compute total harmonic distortion from fundamental and harmonic magnitudes.
Generator Sizing Calculator
Estimate generator kVA from running load, power factor, starting factor, and derating.
Arc Flash Boundary Estimator
Estimate simplified arc-flash boundary distance from voltage, current, and arc duration.
Solar PV System Sizing Calculator
Estimate panel count, inverter size, and battery storage from daily energy demand and sun hours.
Circuit Breaker Sizing Helper
Suggest breaker size from load current and standard derating margins.
Earthing Conductor Sizing Calculator
Estimate grounding conductor area from fault current and fault-clearing time.
Mechanical and Manufacturing
21 tools
Bolt Torque Calculator
Estimate tightening torque from preload, nominal diameter, and nut factor.
Shaft Power and Torque Calculator
Convert between shaft power and torque at a given rotational speed.
Gear Ratio Calculator
Compute gear ratio and output speed from driver and driven tooth counts.
Belt Length Calculator
Estimate open-belt length from pulley diameters and center distance.
Bearing Life Calculator
Calculate L10 bearing life in million revolutions and operating hours.
Machining Speed and Feed Calculator
Estimate spindle speed and feed rate from cutting speed and cutter data.
Tap Drill Size Calculator
Estimate metric tap drill size from major diameter, pitch, and engagement.
Thermal Expansion Calculator
Calculate linear thermal expansion from length, coefficient, and temperature change.
Spring Rate Calculator
Calculate helical compression spring rate from geometry and shear modulus.
Weld Size Calculator
Estimate fillet weld throat area and approximate capacity from allowable stress.
Tolerance Stackup Calculator
Compute total dimensional tolerance using worst-case or RSS method.
Press Fit Interference Calculator
Estimate diametral interference and contact pressure for press fits.
Center of Gravity 2D Calculator
Calculate 2D center of gravity from point masses.
Plate Weight Calculator
Estimate plate mass and weight from dimensions and material density.
Anchor Bolt Pullout Estimator
Estimate anchor pullout capacity from diameter, embedment, and concrete strength.
GD&T Positional Tolerance Calculator
Calculate total positional tolerance with MMC bonus and virtual condition.
Fits and Tolerances ISO Helper
Estimate hole-shaft limits and resulting clearance/interference for common ISO fit classes.
Fatigue Life Estimator
Estimate fatigue life from simplified S-N curve inputs with mean stress correction.
Weld Distortion Estimator
Estimate weld shrinkage and angular distortion from heat input and section properties.
Sheet Metal Bend Allowance Calculator
Compute bend allowance, outside setback, and bend deduction for sheet-metal bending.
CNC Surface Speed Feed Optimizer
Suggest speed and feed from material presets with practical machine constraints.
GIS and Mapping
17 tools
Geo Distance Calculator
Calculate great-circle distance between two latitude/longitude points.
Bearing Calculator
Calculate initial bearings between two geographic points.
Coordinate Format Converter
Convert coordinates between decimal degrees and DMS formats.
Geographic Midpoint Calculator
Compute midpoint coordinate between two points on Earth.
Polygon Area Calculator
Estimate polygon area and perimeter from latitude/longitude vertex list.
UTM Zone Finder
Find UTM zone number and hemisphere from latitude and longitude.
Geohash Tool
Encode lat/lon into geohash or decode geohash to approximate coordinate.
Map Scale Calculator
Calculate map ratio from map and ground distance or reverse-calculate ground distance.
Elevation Grade Calculator
Calculate grade percentage and slope angle from elevations and horizontal distance.
Destination Point Calculator
Compute destination coordinates from start point, bearing, and travel distance.
Survey Traverse Closure Calculator
Compute traverse closure error and relative precision from distance-bearing legs.
Coordinate Transformation Helper
Apply translation, rotation, and scale transformations between local and global coordinate frames.
Traverse Adjustment Bowditch
Adjust traverse latitude/departure values by Bowditch rule and compute corrected coordinates.
Contour Interval Volume Estimator
Estimate volume from contour elevation-area rows using end-area method.
Line of Sight Visibility Tool
Check theoretical line-of-sight visibility from heights and path length with curvature/refraction.
Solar Shadow Azimuth Calculator
Estimate solar azimuth/altitude and shadow direction/length from date and solar time.
Bearing Distance Resection Helper
Estimate unknown point coordinates from bearings observed to two known control points.
Engineering
75 tools
Area and Perimeter Calculator
Calculate area and perimeter for rectangle, circle, triangle, and trapezoid.
Volume and Surface Area Calculator
Calculate volume and surface area for cube, cuboid, cylinder, sphere, and cone.
Slope and Grade Calculator
Convert rise and run to slope ratio, grade percentage, and angle.
Concrete Volume Calculator
Estimate concrete volume for slabs, footings, columns, and beams.
Rebar Weight Calculator
Estimate steel rebar weight from diameter, bar length, and quantity.
Brick and Block Quantity Calculator
Estimate brick or block quantity using wall area, unit size, mortar, and wastage.
Paint Quantity Calculator
Estimate paint requirement from area, coats, coverage rate, and wastage.
Tile Quantity Calculator
Estimate floor tile count from floor dimensions, tile size, and wastage.
Beam Reaction Calculator
Calculate support reactions for simply supported beams with UDL and point load.
Earthwork Cut and Fill Calculator
Estimate cut/fill volume and earthmoving balance with swell and shrinkage factors.
Pipe Flow Velocity Calculator
Calculate internal flow velocity from pipe diameter and volumetric flow rate.
Pipe Pressure Drop Calculator
Estimate pressure loss with Darcy-Weisbach relation from line inputs.
Pump Power Calculator
Estimate hydraulic and shaft power from flow, head, density, and efficiency.
Voltage Drop Calculator
Estimate single-phase and three-phase voltage drop from cable and load inputs.
Cable Size Calculator
Suggest a practical copper cable size from current and installation factors.
Section Properties Calculator
Calculate area and second moments of area for common section shapes.
BOQ Estimator
Estimate bill-of-quantities totals from item lines with overhead and contingency.
Bearing and Azimuth Converter
Convert surveying bearings and azimuth angles in both directions.
Chainage and Stationing Calculator
Generate chainage stations from start, interval, and count.
Leveling Rise and Fall Calculator
Calculate rise, fall, and net level change from BS/FS observations.
Coordinate Area Calculator
Calculate polygon area and perimeter from coordinates using shoelace method.
Stress and Strain Calculator
Calculate stress, strain, and approximate modulus from force and deformation.
Factor of Safety Calculator
Calculate factor of safety from strength and working stress.
Column Slenderness Calculator
Calculate KL/r slenderness ratio from effective length and radius of gyration.
Beam Deflection Calculator
Estimate simply-supported beam deflection under UDL and point load.
Material Cost Estimator
Estimate material procurement cost with tax and transport.
Labor Cost Estimator
Estimate labor spending from crew size, wage, days, and overtime.
Construction Schedule Duration Calculator
Estimate task duration from quantity, crew size, productivity, and daily hours.
Break-even Calculator
Calculate break-even units and revenue from fixed and variable costs.
Soil Bearing Capacity Calculator
Estimate gross allowable and ultimate bearing capacity from net allowable pressure and footing geometry.
Retaining Wall Pressure Calculator
Estimate active lateral earth pressure and resultant force location using Rankine method.
Compaction Control Calculator
Calculate relative compaction and moisture deviation from Proctor reference values.
Manning Flow Calculator
Compute open-channel discharge and velocity using Manning equation inputs.
Weir Discharge Calculator
Estimate rectangular and V-notch weir discharge from crest head and coefficient.
Hazen-Williams Calculator
Estimate pipe head loss and pressure drop in water lines with Hazen-Williams equation.
Cooling Load Estimator
Estimate sensible cooling demand from envelope and internal gains.
Duct Velocity Calculator
Calculate air velocity from airflow and duct dimensions for rectangular or circular ducts.
Air Change Rate Calculator
Compute required airflow for target ACH and achieved ACH from supplied airflow.
Earned Value Calculator
Calculate CPI, SPI, variances, and EAC from planned, earned, and actual cost.
Resource Allocation Calculator
Estimate team size requirements from work content, duration, and daily capacity.
Project Cash Flow Calculator
Estimate monthly net cash profile with retention and mobilization assumptions.
NPSH Available Calculator
Estimate NPSH available from pressure head, static head, and suction losses.
Pipe Friction Loss Calculator
Calculate Darcy-Weisbach friction loss from flow, pipe size, and fluid properties.
Reynolds Number Calculator
Calculate Reynolds number and determine laminar or turbulent flow regime.
Heat Exchanger LMTD Calculator
Compute logarithmic mean temperature difference for parallel and counterflow exchangers.
Psychrometric Air Properties
Estimate humidity ratio, dew point, and moist air enthalpy from dry-bulb and RH.
Compressor Power Estimator
Estimate compressor shaft power from flow, pressure ratio, and efficiency.
Infinite Slope Stability Calculator
Estimate infinite-slope factor of safety using friction angle, cohesion, and pore pressure.
Cantilever Beam Multiple Loads Calculator
Estimate fixed-end reactions and tip deflection for cantilever beam with multiple loads.
Concrete Mix Ratio Calculator
Estimate cement, sand, and aggregate quantities from nominal concrete mix ratio.
RCC Beam Design Helper
Estimate tensile steel demand for rectangular RCC beam sections from factored moment.
Slab Reinforcement Estimator
Estimate slab bar count, total bar length, and steel weight from slab dimensions and spacing.
Footing Sizing Estimator
Estimate footing area and dimensions using service load and allowable bearing pressure.
Steel Section Selector
Estimate required section modulus and indicative inertia for preliminary steel member sizing.
Wind Load Estimator
Estimate wind pressure and lateral force from speed factors, coefficients, and projected area.
Seismic Base Shear Estimator
Estimate seismic base shear using design spectral acceleration, response factor, and seismic weight.
Pump Affinity Laws Calculator
Use affinity laws to estimate flow, head, and power changes with speed or impeller diameter adjustments.
Water Hammer Pressure Estimator
Estimate surge pressure from abrupt velocity changes using Joukowsky relation inputs.
Pipe Network Headloss Calculator
Estimate headloss in a pipe run using Hazen-Williams or Darcy-Weisbach with practical unit support.
Tank Fill Drain Time Calculator
Estimate time required to fill or drain tanks from flow rate and volume values.
Orifice Flow Calculator
Estimate discharge through sharp-edged orifices from head, diameter, and coefficient of discharge.
Detention Basin Sizing Calculator
Estimate required detention storage volume using inflow, outflow, and storm duration assumptions.
Psychrometric Process Plot Helper
Compare two psychrometric states and estimate sensible and latent process components.
Chiller Tonnage Estimator
Estimate refrigeration tons from cooling load or chilled-water flow and temperature difference.
Duct Friction Rate Calculator
Estimate duct friction rate using airflow, diameter, and roughness.
Fan Static Pressure Estimator
Estimate required fan static pressure from duct and component pressure losses.
Heating Load Estimator
Estimate heating load from envelope losses, ventilation, and internal gains.
Cooling Tower Approach Range Calculator
Compute cooling tower approach, range, effectiveness, and heat rejection.
Retaining Wall Stability Check
Check overturning and sliding factors of safety for simplified cantilever retaining walls.
Bar Bending Schedule Calculator
Generate simplified rebar cut-length and weight totals by diameter and quantity.
Staircase Design Calculator
Estimate riser, tread, and stair geometry from floor height and run constraints.
Beam Shear Moment Diagram Generator
Compute support reactions and generate simplified shear and moment diagram tables.
Rainwater Harvesting Tank Sizing
Estimate storage tank size from roof area, rainfall, runoff coefficient, and demand.
Pipe Size from Flow Velocity Calculator
Calculate required internal diameter from target flow rate and design velocity.
Critical Path CPM Calculator
Compute earliest/latest times, float, and critical activities for simple CPM networks.
SEO and Site Utility
27 tools
UTM Builder
Build campaign tracking links with UTM parameters for analytics.
Open Graph Twitter Card Preview
Preview Open Graph and Twitter card metadata from URL or pasted HTML before publishing.
XML Sitemap Validator
Validate sitemap XML syntax, URL entries, duplicates, and sitemap index structure.
Robots.txt Tester
Test robots allow/disallow behavior for any user-agent and path.
Schema Markup Validator
Parse and validate JSON-LD schema markup with missing-field warnings.
Broken Link Checker
Crawl a single page and detect outbound links that are broken or unreachable.
Slug Generator
Create clean SEO-friendly URL slugs from text.
Robots.txt Generator
Generate clean robots.txt files with allow/disallow paths, sitemap links, and crawler directives.
XML Sitemap Generator
Generate XML sitemaps from page paths with configurable changefreq and priority defaults.
CSP Generator
Build Content-Security-Policy headers from common directives for production-ready deployment.
CSP Evaluator
Analyze CSP header strings for missing directives, duplicate rules, and weak security patterns.
HTTP Header Checker
Parse and inspect raw HTTP headers with duplicate detection and security header checks.
Canonical URL Generator
Normalize URLs and generate canonical link tags for SEO consistency.
Hreflang Generator
Generate alternate hreflang tags from locale and URL rows.
Meta Description Generator
Draft and validate meta title/description length with snippet preview output.
Redirect Rules Generator
Generate Apache or Nginx redirect rules from old,new URL maps.
Color Contrast Checker
Check WCAG AA/AAA contrast ratio between two colors.
Robots Rule Tester
Test robots allow/disallow behavior for user-agents and paths.
Schema Markup Generator
Generate FAQ, HowTo, and Product JSON-LD schema markup.
HTML Heading Extractor
Extract H1-H6 heading outline from HTML snippets.
CSP Nonce Hash Generator
Generate CSP nonce and hash values for inline scripts.
URL Batch Analyzer
Analyze URL lists for domains, protocols, and query params.
HTML Link Extractor
Extract links and asset URLs from HTML content.
Sitemap Auditor
Audit sitemap XML for duplicates and invalid URLs.
Robots Meta Generator
Generate robots meta tag and X-Robots-Tag directives.
URL Normalizer
Normalize URL lists by stripping trackers and sorting params.
HTML Meta Extractor
Extract title, description, canonical, and OG tags from HTML.
Fun
5 tools
Map Plotter
Plot latitude and longitude points on an animated world grid instantly.
Dice Roller
Roll one or multiple dice with animation and instant totals.
Coin Flip
Flip a virtual coin with smooth animation and streak tracking.
Random Number Picker
Pick fair random numbers from custom ranges with animated draw.
Random Number Wheel
Pick random numbers instantly from a configurable range.