All Tools
Browse all 271 free online tools across 18 categories.
BMI Calculator
Calculate your Body Mass Index based on weight and height
Word Counter
Count words, characters, sentences, and estimate reading time
Case Converter
Convert text between uppercase, lowercase, title case, camelCase, and more
Percentage Calculator
Calculate percentages, percentage of a number, and percentage change
Password Generator
Generate strong, random passwords with customizable options
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting
Base64 Encoder/Decoder
Encode and decode Base64 strings
UUID Generator
Generate and validate UUIDs (v4)
Regex Tester
Test regular expressions with real-time matching
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes
Curl Converter
Convert curl commands to Python, JavaScript, Go, PHP, and 10+ languages
Color Picker & Converter
Pick colors and convert between HEX, RGB, HSL with WCAG contrast checker
CSS Gradient Generator
Create beautiful CSS gradients with live preview and code export
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates
Date Difference Calculator
Calculate the difference between two dates in years, months, days
Unit Converter
Convert between metric and imperial units for length, weight, temperature, and more
Loan Calculator
Calculate monthly payments, total interest, and amortization schedule
Number to Words
Convert numbers to words in English, Vietnamese, Japanese, and Chinese
Lorem Ipsum Generator
Generate placeholder text for design and development
BMR & TDEE Calculator
Calculate Basal Metabolic Rate and Total Daily Energy Expenditure
Tip Calculator
Calculate tips and split bills between multiple people
Markdown Preview
Write Markdown and see real-time HTML preview
Image Resizer
Resize images to custom dimensions with aspect ratio lock
Image Filter
Apply CSS filters like brightness, contrast, grayscale, and more
Image Converter
Convert images between PNG, JPEG, and WebP formats
Image Cropper
Crop images with an interactive drag interface
Image Watermark
Add text watermark to images with customizable position, font, and opacity
Image Compressor
Compress images by adjusting JPEG quality to reduce file size
Image to Base64
Convert images to Base64 strings and decode Base64 back to images
CSV to JSON Converter
Convert CSV data to JSON format with customizable options
JSON to CSV Converter
Convert JSON arrays to CSV format with customizable delimiters
Statistics Calculator
Calculate mean, median, mode, standard deviation and more
Chart Generator
Create bar, line, pie and doughnut charts from your data
JSON Viewer
Parse and explore JSON data in an interactive tree view
CSV Viewer
View and sort CSV files as an interactive table
QR Code Generator
Generate customizable QR codes with colors, size, and error correction options
QR Code Reader
Decode QR codes from uploaded images instantly in your browser
WiFi QR Code
Generate a QR code for easy WiFi sharing — scan to connect instantly
vCard QR Code
Generate a QR code containing your contact information (vCard format)
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine temperature scales
Length Converter
Convert between mm, cm, m, km, inches, feet, yards, miles, and nautical miles
Weight Converter
Convert between mg, g, kg, tonnes, ounces, pounds, and stones
Area Converter
Convert between square millimeters, meters, kilometers, hectares, acres, and more
Volume Converter
Convert between mL, liters, cubic meters, gallons, quarts, pints, cups, and more
Speed Converter
Convert between m/s, km/h, mph, knots, ft/s, and Mach
Data Size Converter
Convert between bits, bytes, KB, MB, GB, TB, PB with binary and SI modes
Pressure Converter
Convert between Pascal, kPa, bar, atm, PSI, mmHg, and inHg
Energy Converter
Convert between Joules, kilojoules, calories, kilocalories, Wh, kWh, BTU, and eV
Angle Converter
Convert between degrees, radians, gradians, turns, arcminutes, and arcseconds
Time Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years
Frequency Converter
Convert between Hz, kHz, MHz, GHz, and RPM
Fuel Consumption Converter
Convert between L/100km, km/L, MPG (US), and MPG (UK)
Cooking Converter
Convert cooking measurements between cups, tablespoons, teaspoons, mL, and grams by ingredient
Number System Converter
Convert between decimal, binary, octal, hexadecimal, and Roman numerals
Text Reverser
Reverse text by characters, words, or lines
Text Repeater
Repeat text multiple times with custom separator
Remove Duplicates
Remove duplicate lines from text with sorting and case options
Text Line Sorter
Sort lines of text alphabetically, numerically, or by length
Find and Replace
Find and replace text with regex support and case-insensitive matching
String Encoder/Decoder
Encode and decode strings with ROT13, Binary, Morse, and Hex
Text to Slug
Convert text to URL-friendly slug
Markdown to HTML
Convert Markdown text to clean HTML with live preview
Text Diff Checker
Compare two texts and find the differences
Line Counter
Count lines, blank lines, duplicates, and line statistics in text
Random String Generator
Generate random strings with customizable length, count, and character types
Unicode Lookup
Look up Unicode character information and code points
Scientific Calculator
Full-featured scientific calculator with trigonometry, logarithms, and history
Compound Interest Calculator
Calculate compound interest with detailed yearly breakdown
ROI Calculator
Calculate return on investment with annualized ROI and visual comparison
Discount Calculator
Calculate sale price and savings from a discount
Average Calculator
Calculate mean, median, mode and other statistical averages
Fraction Calculator
Add, subtract, multiply, and divide fractions with simplified results
GCD & LCM Calculator
Calculate the Greatest Common Divisor and Least Common Multiple
Prime Number Checker
Check if a number is prime, find prime factorization, or list primes in a range
Fibonacci Generator
Generate Fibonacci numbers by count or up to a maximum value
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal
Equation Solver
Solve linear and quadratic equations with step-by-step results
Ratio Calculator
Solve ratios, find missing values, and simplify ratios with visual breakdown
URL Encoder/Decoder
Encode and decode URLs and query strings
HTML Encoder/Decoder
Encode and decode HTML entities
JWT Decoder
Decode and inspect JSON Web Tokens without verification
Cron Expression Parser
Parse and validate cron expressions, see next run times, and explain field meanings
Diff Checker
Compare two texts and highlight the differences line by line
SQL Formatter
Format and beautify SQL queries
CSS Minifier / Beautifier
Minify or beautify CSS code to reduce file size or improve readability
HTML Minifier
Minify or beautify HTML code to reduce file size
JavaScript Minifier
Minify or beautify JavaScript code to reduce file size
YAML / JSON Converter
Convert between YAML and JSON formats
XML / JSON Converter
Convert between XML and JSON formats
IP Subnet Calculator
Calculate subnet details including network address, broadcast, and host range
HTTP Status Codes
Browse and search all HTTP status codes with descriptions
Unix Permissions Calculator
Convert Unix file permissions between numeric (octal) and symbolic notation, with chmod command builder
Fake Data Generator
Generate realistic fake data for testing: names, emails, addresses, and more
Hash Checker
Compute and verify MD5, SHA-1, and SHA-256 hashes
Password Strength Checker
Analyze password strength with detailed scoring and improvement tips
Encryption Tool
Encrypt and decrypt text using AES-GCM with a password
SSL Certificate Decoder
Decode and inspect SSL/TLS certificates
htpasswd Generator
Generate Apache htpasswd file entries for HTTP authentication
CSP Generator
Generate Content Security Policy headers for your website
CORS Config Generator
Generate CORS configuration for Node.js, Nginx and Apache
Color Converter
Convert colors between HEX, RGB, HSL, HSV and CMYK formats
Color Palette Generator
Generate harmonious color palettes from a base color
Contrast Checker
Check color contrast ratio for WCAG accessibility compliance
Color Blender
Blend two colors together and generate intermediate color steps
Color Shades Generator
Generate light and dark shade variations of any color
Tailwind Color Finder
Find the closest Tailwind CSS color for any color
CSS Gradient Generator
Create beautiful CSS gradients with live preview
Image Color Extractor
Extract dominant colors from any image with hex codes
TDEE Calculator
Calculate your Total Daily Energy Expenditure
Ideal Weight Calculator
Calculate your ideal body weight using multiple formulas
Calorie Calculator
Calculate daily calories needed to reach your weight goal
Body Fat Calculator
Estimate body fat percentage using the U.S. Navy method
Water Intake Calculator
Calculate your recommended daily water intake
Pregnancy Calculator
Calculate due date, current week, trimester, and pregnancy milestones
Timezone Converter
Convert time between different timezones
Age Calculator
Calculate your exact age in years, months, days and more
Countdown Timer
Set a countdown to any future date and time
Work Hours Calculator
Calculate working hours, overtime, and break time
Week Number Calculator
Find the ISO week number for any date
Date Formatter
Format dates in ISO 8601, US, EU, Unix timestamp and more
Lunar Calendar
Convert Gregorian dates to Lunar calendar with zodiac and stem-branch
Random Number Generator
Generate random numbers within a range with sum and average statistics
Dice Roller
Roll virtual dice with customizable sides and count
Coin Flipper
Flip one or more coins with random results and statistics
List Randomizer
Shuffle and randomize lists, or pick random items from a list
Stopwatch
Online stopwatch with lap timing
Screen Resolution Detector
Detect your screen resolution and display information
Typing Speed Test
Test your typing speed and accuracy
Power Converter
Convert between watts, kilowatts, horsepower, BTU/h and more
Force Converter
Convert between newtons, pound-force, dyne, kilogram-force
Torque Converter
Convert between newton-meter, foot-pound, kilogram-force meter
Density Converter
Convert between kg/m³, g/cm³, lb/ft³, g/mL, kg/L
Flow Rate Converter
Convert between L/s, gallons/min, m³/h, CFM
Electric Current Converter
Convert between ampere, milliampere, microampere, kiloampere
Voltage Converter
Convert between volt, millivolt, kilovolt, megavolt
Luminance Converter
Convert between lux, foot-candle, lumen, phot, nox
Shoe Size Converter
Convert shoe sizes between US, EU, UK, JP systems
Typography Converter
Convert between px, pt, em, rem, cm, in, pica
Acceleration Converter
Convert between m/s², g-force, gal, ft/s²
Viscosity Converter
Convert between Pa·s, poise, centipoise, stokes, centistokes
Magnetic Field Converter
Convert between tesla, gauss, oersted, A/m
Radioactivity Converter
Convert between becquerel, curie, rutherford, dps
Radiation Dose Converter
Convert between gray, sievert, rad, rem, roentgen
Sound Level Converter
Calculate decibel levels, SPL, power and intensity ratios
Astronomical Distance Converter
Convert between light-year, parsec, AU, kilometer, mile
Resolution Converter
Convert between DPI, PPI, pixels/cm, dots/meter
Clothing Size Converter
Convert clothing sizes between US, EU, UK, JP systems
Roman Numeral Converter
Convert between decimal numbers and Roman numerals
Pixel Converter
Convert between px, em, rem, %, vw, vh CSS units
Color Temperature Converter
Convert between Kelvin and Mired, with color preview
Baud Rate Converter
Convert between baud, bps, Kbps, Mbps, Gbps, bytes/s
pH Scale Converter
Convert pH to H+ concentration, classify acidity/alkalinity
Text to Binary
Convert text to binary representation and vice versa
Text to ASCII Art
Convert text to ASCII art using block characters
Whitespace Remover
Remove, trim, and collapse whitespace from text
Invisible Character Detector
Detect and reveal hidden/zero-width characters in text
NATO Phonetic Alphabet
Convert text to NATO phonetic alphabet and back
HTML Tag Stripper
Strip HTML tags from text with various options
Text Truncator
Truncate text by characters or words with ellipsis
Reading Time Calculator
Estimate reading and speaking time for text
Syllable Counter
Count syllables in English text with per-word breakdown
Extract Emails & URLs
Extract email addresses, URLs, and phone numbers from text
Text to Table
Convert delimited text to HTML or Markdown table
CSV to Markdown Table
Convert CSV data to Markdown table format
JSON to Text
Flatten JSON to readable text with various formats
Morse Code Converter
Convert text to Morse code and vice versa
Number Extractor
Extract all numbers from text with statistics
Fullwidth-Halfwidth Converter
Convert between fullwidth (zenkaku) and halfwidth (hankaku) characters
JSONPath Tester
Test JSONPath expressions against JSON data
JSON Schema Validator
Validate JSON data against a JSON Schema
JSON to TypeScript
Generate TypeScript interfaces from JSON data
User Agent Parser
Parse user agent strings to extract browser, OS, device info
MIME Type Lookup
Search MIME types by file extension or content type
ASCII Table
Interactive ASCII character reference table (0-127)
Meta Tag Generator
Generate HTML meta tags for SEO and social media
Robots.txt Generator
Generate robots.txt with user-agent rules and sitemap
Sitemap Generator
Generate sitemap.xml from a list of URLs
TOML ↔ JSON Converter
Convert between TOML and JSON formats
SVG Optimizer
Optimize and clean SVG code
CSS Unit Converter
Convert between CSS units: px, rem, em, %, vw, vh, pt
API Request Builder
Build HTTP requests and generate code for cURL, fetch, axios
Code Screenshot
Convert code to beautiful image using Canvas
Image Rotate
Rotate images by any angle
Image Flip
Flip images horizontally or vertically
Image Blur
Apply blur effect to images
Image Pixelate
Pixelate images with adjustable pixel size
Image Border
Add borders to images with custom style
Image Circle Crop
Crop images into circle or ellipse shape
Image Collage
Create photo collages from multiple images
Image Noise
Add noise/grain effect to images
Background Remover
Remove image backgrounds automatically using AI — 100% client-side, no upload
AI Language Detector
Detect the language of any text using AI
AI Sentiment Analyzer
Analyze the sentiment and emotion of any text using AI
AI Image Upscaler
Upscale and enhance images 2x, 3x, or 4x with high-quality interpolation
AI Image Caption
Generate descriptive captions for images using AI
AI Face Blur
Automatically detect and blur faces in photos for privacy
AI Speech to Text
Transcribe audio to text using AI (Whisper)
AI Pose Detector
Detect body poses and draw skeleton overlay on images
AI Object Remover
Remove unwanted objects from photos using AI inpainting
AI Translator
Translate text between languages using AI offline
AI Text Summarizer
Summarize long texts using AI
AI Grammar Checker
Check and fix grammar errors using AI
AI Code Explainer
Explain code snippets using AI
AI Image Colorizer
Colorize black & white photos using AI
Random Color Generator
Generate random colors with various modes
Color Name Lookup
Find the closest named CSS color from any hex value
Color Blindness Simulator
Simulate how colors appear under different color vision deficiencies
Color Wheel
Interactive color wheel with harmony calculations
Brand Colors
Reference of popular brand colors with hex codes
Blood Pressure Checker
Check and categorize blood pressure readings
Heart Rate Zones
Calculate heart rate training zones using Karvonen formula
Leap Year Checker
Check if a year is a leap year and find leap years in range
Calendar Generator
Generate visual month/year calendar with custom options
TSV / CSV Converter
Convert between Tab-Separated (TSV) and Comma-Separated (CSV) formats
JSONL / JSON Converter
Convert between JSON Lines (JSONL) and JSON Array formats
Markdown to Text
Strip Markdown formatting and extract plain text content
JSON to PHP Array
Convert JSON data to PHP array syntax code
Properties / JSON Converter
Convert between Java .properties files and JSON format
HTML to Markdown
Convert HTML code to Markdown format
JSON / SQL Converter
Convert between JSON arrays and SQL INSERT statements
CSV / XML Converter
Convert between CSV and XML data formats
YAML / TOML Converter
Convert between YAML and TOML configuration formats
JSON to HTML Table
Convert JSON array data to HTML table code
CSV to SQL
Convert CSV data to SQL CREATE TABLE and INSERT statements
PDF Merge
Combine multiple PDF files into a single document
PDF Split
Split a PDF document into separate files by page ranges
PDF to Text
Extract text content from PDF documents
Image to PDF
Convert images (JPG, PNG) to a PDF document
PDF Metadata
View and edit PDF document metadata (title, author, etc.)
PDF to Image
Convert PDF pages to PNG or JPG images
HTML to PDF
Convert HTML content to a downloadable PDF document
PDF to Excel
Extract tables from PDF files to Excel or CSV format
PDF to Word
Convert PDF files to Word (.docx) format
Markdown ↔ Excel Converter
Convert between Markdown tables and Excel/CSV files
Vietnamese Input Converter
Convert Vietnamese typed in Telex, VNI, or VIQR notation to Unicode
EXIF Viewer & Remover
Inspect photo metadata (camera, GPS, dates) and strip it for privacy — all in your browser
TOTP / 2FA QR Generator
Create otpauth:// secrets and QR codes for authenticator apps — Google Authenticator, Authy, 1Password compatible
Token Counter (LLM)
Count tokens for GPT, Claude, and Gemini prompts. Exact via tiktoken for OpenAI models, approximation for Claude/Gemini.
Mermaid Diagram Editor
Write Mermaid syntax, get a live SVG diagram. Flowchart, sequence, class, ER, Gantt, pie, state, journey — all client-side.
OpenAPI / Swagger Viewer
Paste an OpenAPI 3 or Swagger 2 spec (YAML or JSON), browse endpoints, parameters, and schemas. All client-side, no upload.
Favicon Generator
Upload a logo, get a full set of favicons (16-512px), apple-touch-icon, PWA icons, plus ready-to-paste HTML and webmanifest.
PDF Watermark
Stamp a text watermark (CONFIDENTIAL, DRAFT, your name…) onto every page of a PDF. Customisable position, size, opacity, colour, rotation.
PDF Rotate
Rotate selected pages of a PDF by 90°, 180°, or 270°. Specify pages by range (1-3,5,7-9) — all client-side.
Tailwind Palette Generator
Pick a base color, get an 11-shade Tailwind palette (50-950) with perceptually-uniform OKLCH steps. Export as v3 config, v4 @theme, or CSS variables.
Video Toolkit (ffmpeg.wasm)
Trim, convert (MP4/WebM/MOV), compress, turn into GIF, extract audio, mute. Runs ffmpeg in your browser — no upload, no server.
JSON-LD Schema Generator
Generate schema.org JSON-LD markup for Article, Product, FAQ, LocalBusiness, Person, Event, and Breadcrumbs. Form-based, copy-paste ready.
UTM Link Builder
Build trackable URLs with utm_source / utm_medium / utm_campaign params. QR code generated automatically. GA4 / Universal Analytics compatible.
Heading Outline Checker
Paste HTML, see the H1-H6 outline as a tree, and get WCAG accessibility warnings for skipped levels, missing H1, and empty headings.
OSS License Picker
Pick from 8 popular open-source licenses (MIT, Apache 2.0, GPL-3, BSD, MPL 2.0, ISC, Unlicense). See permissions / conditions / limitations side-by-side, then download a ready-to-commit LICENSE file.
Open Graph Preview
Paste HTML and preview how Facebook, Twitter, LinkedIn, and Slack will render your share card.
Sitemap Validator
Validate sitemap.xml structure, lastmod format, hreflang alternates, and URL count limits — all in your browser.
Robots.txt Tester
Simulate how Googlebot and other crawlers apply Allow/Disallow rules from your robots.txt to specific URLs.
Keyword Density Analyzer
Count word and phrase frequency, density %, and reading time. Multilingual stopwords for EN / VI / JA / ZH.
Audio Converter & Trimmer
Trim, resample, mono/stereo, gain, fade — convert any audio to 16-bit WAV right in your browser.
Audio Normalizer
Normalize audio loudness to Spotify/YouTube/Podcast/Broadcast targets via peak or LUFS — entirely in-browser.
BPM Detector
Detect the tempo (BPM) of any song or beat by analyzing peak intervals — runs entirely in your browser.
Text to Speech
Convert any text to speech using your browser's built-in voices. 50+ languages, runs offline once voices are installed.
Alt Text Auditor
Paste HTML to audit <img>, <svg>, <input type=image> and role=img elements against WCAG 2.1 alt-text rules.
ARIA Landmark Visualizer
Paste HTML to see the page's landmark tree (banner/main/nav/aside/footer + ARIA roles) and structural a11y issues.
Form Label Checker
Paste an HTML form to verify every <input>, <select>, <textarea>, and <button> has an accessible name per WCAG 3.3.2.
Privacy Policy Generator
Build a privacy policy in Markdown for Generic / GDPR (EU) / CCPA (California) / Vietnam Decree 13 from a short form.
Cookie Banner Generator
Build a self-contained HTML+CSS+JS cookie consent banner — no framework, no CDN. Exposes window.cookieConsent API.
License Header Inserter
Prepend a license header to source code in JS/TS/Python/Go/Rust/Java/C/CSS/HTML — SPDX, short, or full text.
Markdown Table Builder
Visual editor for GitHub-Flavored Markdown tables — add rows/columns, set column alignment, paste-import existing tables.
PDF Page Extractor
Pick specific pages from a PDF (ranges or individual numbers) and download just those as a new PDF.
TXT to PDF
Convert plain text or .txt files to PDF with customizable paper size, font, margins, and page numbers.
Invoice Generator
Fill a short form and generate a professional invoice PDF — freelancer / consultant / small business friendly.
Cover Letter Generator
Fill a short form, pick a tone (formal / casual / enthusiastic), and export a polished cover letter as Markdown or PDF.
Bibliography Builder
Build a citation list for academic papers — APA 7, MLA 9, Chicago, or BibTeX. Books, journals, websites, newspapers, videos.
Mail Merge
Combine a CSV of records with a {{field}} template and bulk-generate one document per row — in-browser, no upload.
Resume Builder
Multi-section form, three PDF templates (Modern / Classic / Minimal). Built for a one-page A4 resume in 5 minutes.