Free Developer Tools That
Never Touch a Server
111+ browser-based utilities — format, encode, generate, convert. Zero sign-up. Zero tracking. Your data stays on your device.
Generators
Create UUIDs, passwords, hashes, random values, and links — powered by Web Crypto.
UUID Generator
Generate UUID v4 (random) and v7 (timestamp) identifiers instantly. Copy with one click. Free, 100% client-side, no data leaves your browser.
Password Generator
Create strong, random passwords in one click — customize length, symbols, and character types. No sign-up, no data sent to servers. 100% browser-based.
Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text instantly. Verify data integrity with ease. Free, runs 100% in your browser.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words. Perfect for mockups, wireframes, and layouts. Free, instant, no sign-up.
Yes/No Randomizer
Get a random Yes or No answer instantly. Simple decision maker powered by cryptographic randomness. Free, runs 100% in your browser.
Random Number Generator
Generate cryptographically secure random numbers within any range. Set min, max, and quantity. Free online tool, 100% client-side.
Random Word Generator
Generate random words for brainstorming, creative writing, word games, or testing. Choose from nouns, adjectives, or verbs. Free, 100% in your browser.
WhatsApp Link Generator
Generate WhatsApp click-to-chat links with pre-filled messages. Get wa.me links, API links, and HTML embed code. Free, 100% in your browser.
Telegram Link Generator
Generate Telegram links for users, groups, and channels. Get t.me links and HTML embed code instantly. Free, 100% in your browser.
Username Generator
Generate random unique usernames in multiple styles: adjective-noun, word-number, alliterative, and initials. Copy any username with one click. Free, 100% in your browser.
Passphrase Generator
Generate secure random passphrases from a 256-word list using the Web Crypto API. Customize word count, separator, capitalization, and numbers. See entropy estimate. Free, 100% in your browser.
Random Token Generator
Generate cryptographically secure random tokens and API keys in hex, base64, alphanumeric, or URL-safe formats. Free, 100% in your browser.
Encoders / Decoders
Encode, decode, and inspect Base64, URLs, JWTs, Morse code, Punycode, and number bases.
Base64 Encoder / Decoder
Encode or decode Base64 in one click — full Unicode support, instant results. No uploads, no servers. Paste your text and get results immediately.
URL Encoder
Paste a URL or text and encode or decode it with percent-encoding instantly. Ideal for query strings, API parameters, and form data. Free, 100% in your browser.
JWT Decoder
Paste a JWT and instantly see the decoded header, payload, and expiration status. No tokens are sent to any server — everything runs in your browser.
Morse Code Converter
Convert text to Morse code and Morse code back to text instantly. Supports letters, numbers, and punctuation. Free, 100% in your browser.
Punycode Converter
Convert between Unicode and Punycode (ACE) for internationalized domain names. Encode/decode IDN domains instantly. Free, 100% in your browser.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal instantly. Supports large integers. Free, 100% in your browser.
ASCII Table
Browse the complete ASCII table with decimal, hex, octal, binary, and character values. Instant search and one-click copy. Free reference tool.
ROT Cipher
Encode and decode text with ROT13, ROT47, ROT5, ROT18, or custom rotation ciphers. Encrypt and decrypt instantly. Free, 100% in your browser.
Caesar Cipher
Encode and decode text with the Caesar cipher. Shift letters A-Z by any amount (1-25). Encrypt and decrypt instantly. Free, 100% in your browser.
Vigenere Cipher
Encode and decode text with the Vigenere cipher using a keyword. Polyalphabetic substitution encryption and decryption. Free, 100% in your browser.
Text Tools
Count characters and words, compare text, convert cases, and explore emojis.
Character Counter
Count characters, words, sentences, and paragraphs in real time. Shows reading time and word frequency. Free online tool, no sign-up required.
Word Counter
Count words, sentences, paragraphs, and estimated reading time as you type. Free online tool, no sign-up required. Runs 100% in your browser.
Text Compare
Paste two texts and instantly see every difference highlighted line by line. Perfect for code reviews and document revisions. Free, no sign-up needed.
Case Converter
Convert text to UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, and Sentence case instantly. Free, 100% in your browser.
Emoji Explorer
Browse and search over 1,000 emojis by category or keyword. Click any emoji to copy it instantly. Free, runs 100% in your browser.
Duplicate Line Remover
Remove duplicate lines from text instantly. Options for case-sensitive matching, whitespace trimming, and sorting. Free, 100% in your browser.
Typing Speed Test
Test your typing speed in WPM (words per minute) with a 60-second timed test. See accuracy and mistake count in real-time. Free, runs 100% in your browser.
Word Frequency Counter
Count word frequency in any text instantly. See the most common words with visual bar charts. Filter by minimum frequency and toggle case sensitivity. Free, 100% in your browser.
Reading Time Estimator
Estimate how long it takes to read any text. Shows word count, character count, reading time, and speaking time. Adjustable words per minute. Free, 100% in your browser.
Converters
Convert between formats: timestamps, colors, CSV/JSON, CSS units, images, and more.
Timestamp Converter
Paste a Unix timestamp and see the human-readable date instantly, or pick a date to get its timestamp. Supports seconds and milliseconds. Free, 100% client-side.
Color Converter
Pick a color or paste a HEX, RGB, or HSL value and see all formats update instantly. Free online tool for developers and designers.
CSV ↔ JSON Converter
Paste CSV or JSON data and convert between formats in one click. Supports custom delimiters. Free, private — your data never leaves your browser.
JSON ↔ YAML Converter
Convert between JSON and YAML instantly. Paste JSON to get clean YAML, or paste YAML to get formatted JSON. Configurable indentation. Free, 100% in your browser.
CSS Units Converter
Type a value in px, rem, em, or vw and see all equivalents instantly. Configurable base font size and viewport width. Free, essential for responsive CSS.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly. Live results as you type. Free, runs 100% in your browser.
Length Converter
Convert between length and distance units instantly: millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles. Free, 100% in your browser.
Image Converter
Convert images between JPG, PNG, WebP, and ICO formats in your browser. Adjust quality, preview results, see file size savings. Free, 100% client-side.
XML ↔ JSON Converter
Convert between XML and JSON instantly. Handles attributes, nested elements, and arrays. Configurable indentation. Free, 100% in your browser.
Markdown ↔ HTML Converter
Convert between Markdown and HTML instantly. Supports headings, bold, italic, links, lists, code blocks, and more. Free, 100% in your browser.
Image Compressor
Compress and resize images in your browser. Convert between JPEG, PNG, and WebP formats. Adjust quality and see size savings instantly. Free, 100% client-side.
Weight Converter
Convert between weight and mass units instantly: milligrams, grams, kilograms, tonnes, ounces, pounds, and stones. Free, 100% in your browser.
Speed Converter
Convert between speed units instantly: m/s, km/h, mph, knots, ft/s, and Mach. Free, 100% in your browser.
Volume Converter
Convert between volume units instantly: milliliters, liters, cubic meters, teaspoons, tablespoons, fluid ounces, cups, pints, and gallons. Free, 100% in your browser.
Area Converter
Convert between area units instantly: mm², cm², m², km², hectares, in², ft², yd², acres, and mi². Free, 100% in your browser.
Data Units Converter
Convert between digital storage units: bits, bytes, KB, MB, GB, TB, PB, and binary units (KiB, MiB, GiB, TiB). Free, 100% in your browser.
Energy Converter
Convert between energy units instantly: joules, kilojoules, calories, kilocalories, watt-hours, kilowatt-hours, BTU, and electronvolts. Free, 100% in your browser.
Pressure Converter
Convert between pressure units instantly: Pascal, kilopascal, bar, atmosphere, PSI, mmHg, inHg, and torr. Free, 100% in your browser.
Angle Converter
Convert between angle units instantly: degrees, radians, gradians, arcminutes, arcseconds, turns, and milliradians. Free, 100% in your browser.
Frequency Converter
Convert between frequency units instantly: Hertz, kilohertz, megahertz, gigahertz, terahertz, RPM, and radians per second. Free, 100% in your browser.
Power Converter
Convert between power units instantly: watts, kilowatts, megawatts, horsepower, BTU/h, calories per second, and foot-pounds per second. Free, 100% in your browser.
Pace Converter
Convert between running pace and speed units: min/km, min/mi, km/h, mph, m/s, and ft/s. Perfect for runners and athletes. Free, 100% in your browser.
Number to Words Converter
Convert numbers to written English words instantly. Supports integers, decimals, and negative numbers up to trillions. Free, 100% in your browser.
Voltage Converter
Convert between voltage units instantly: volts, millivolts, kilovolts, megavolts, and microvolts. Free, accurate, and 100% in your browser.
Current Converter
Convert between electric current units instantly: amperes, milliamperes, microamperes, and kiloamperes. Free, accurate, 100% in your browser.
Illuminance Converter
Convert between illuminance units instantly: lux, foot-candle, phot, nox, and kilolux. Free, accurate, and 100% in your browser.
Calculators
Calculate percentages, dates, mortgages, BMI, discounts, and track time.
Percentage Calculator
Calculate percentages instantly: find X% of a number, what percentage X is of Y, or the percentage change between two values. Free, 100% in your browser.
Discount Calculator
Calculate discounts instantly: find savings from a percentage off, or find the original price from a sale price. Free, 100% in your browser.
VAT Calculator
Calculate VAT instantly: add VAT to a net price or remove VAT from a gross price. Supports preset rates from 0% to 27%. Free, 100% in your browser.
Mortgage Calculator
Calculate monthly mortgage payments, total payment, and total interest. Supports annuity and differentiated payment methods. Free, 100% in your browser.
BMI Calculator
Calculate your Body Mass Index (BMI) from weight and height. See your BMI category — underweight, normal, overweight, or obese. Free, 100% in your browser.
Age Calculator
Calculate your exact age in years, months, and days from your birthdate. Find out days until your next birthday. Free, 100% in your browser.
Date Calculator
Calculate the exact difference between two dates in years, months, days, hours, minutes, and total units. Free, runs 100% in your browser.
Stopwatch
Free online stopwatch with lap timing and split times. Millisecond precision. Export lap data as CSV or JSON. Runs 100% in your browser.
Countdown Timer
Free online countdown timer with alarm sound. Set hours, minutes, seconds or use quick presets. Visual and audio alert when done. 100% in your browser.
Timezone Converter
Convert time between any timezones instantly. Supports all major world timezones with UTC offset display. Auto-detects your local timezone. Free, 100% in your browser.
Download Time Calculator
Calculate how long a file download will take based on file size and connection speed. Includes presets for 3G, 4G, 5G, DSL, fiber, and gigabit. Free, 100% in your browser.
Salary / Hourly Calculator
Convert between yearly salary, monthly, weekly, daily, and hourly pay rates. Adjustable hours per week and weeks per year. Free, 100% in your browser.
Workday Calculator
Calculate working days between two dates or add/subtract business days from a date. Excludes weekends automatically. Free, runs 100% in your browser.
Leap Year Detector
Check if any year is a leap year. See days in February, divisibility rules, and the next and previous leap years. Free, runs 100% in your browser.
GCD & LCM Calculator
Calculate the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of two or more numbers with step-by-step Euclidean algorithm. Free, 100% in your browser.
Prime Number Checker
Check if any number is prime, see its prime factorization, and find nearby primes. Uses trial division up to the square root. Free, 100% in your browser.
Web Development
Test regex, minify code, format JSON, parse cron, and generate meta tags and .htaccess files.
Meta Tags Generator
Fill in your page details and get copy-paste ready meta tags for SEO, Open Graph, and Twitter Cards. Free, runs entirely in your browser.
.htaccess Generator
Toggle the options you need and get a ready-to-deploy .htaccess file for Apache. HTTPS redirects, caching, gzip, and more. Free, no sign-up.
Regex Tester
Test regular expressions in real time with match highlighting and capture group display. Free online regex debugger, runs 100% in your browser.
Code Minifier
Paste your HTML, CSS, or JavaScript and get a minified version instantly. See exact size savings. Free, 100% client-side — no data sent anywhere.
JSON Formatter
Format, validate, and minify JSON with syntax error detection and line numbers. Free online JSON beautifier and validator, 100% in your browser.
CRON Parser
Parse and explain CRON expressions. See the next 5 execution times and get a human-readable description of any cron schedule. Free, 100% in your browser.
Screen Size Detector
Detect your viewport size and screen resolution instantly. See dimensions update in real-time as you resize the browser window. Free, 100% in your browser.
Password Strength Checker
Check password strength instantly: entropy analysis, crack time estimate, pattern detection, and composition breakdown. Free, 100% in your browser — your password never leaves your device.
URL Parser
Parse any URL into its components: protocol, host, port, path, query parameters, and fragment. Analyze URL structure instantly. Free, 100% in your browser.
IBAN Validator
Validate IBAN numbers instantly with MOD-97 checksum verification. See country code, check digits, and BBAN breakdown. Free, 100% in your browser.
JSON Validator
Validate JSON syntax instantly with detailed error messages. Format, minify, and inspect JSON structure with key/array counts and depth analysis. Free, 100% in your browser.
IP Address Parser
Parse and analyze IP addresses instantly. Supports IPv4 and IPv6 with binary, decimal, hex representations, class detection, and scope identification. Free, 100% in your browser.
Subnet Calculator
Calculate subnet details from CIDR notation: network address, broadcast, subnet mask, wildcard, host range, and total usable hosts. Free, 100% in your browser.
User Agent Parser
Parse user agent strings to detect browser, engine, operating system, device type, and bot status. Supports all major browsers and platforms. Free, 100% in your browser.
HTTP Status Code Explorer
Browse all HTTP status codes with descriptions. Filter by category (1xx-5xx), search by code or name. Quick reference for web developers. Free, 100% in your browser.
Curl Builder
Build curl commands visually with method, URL, headers, body, and options. Copy the generated command to your clipboard. Free, 100% in your browser.
EXIF Reader
Read EXIF metadata from JPEG images. See camera model, exposure, GPS coordinates, date taken, and more. Free, 100% in your browser.
Phone Number Parser
Parse, validate, and format phone numbers in international, national, and E.164 formats. Supports 40+ countries. Free, 100% in your browser.
ISBN Validator
Validate ISBN-10 and ISBN-13 numbers with check digit verification. See formatted ISBN, check digit, and conversion between formats. Free, 100% in your browser.
Email Validator
Validate email address syntax according to RFC 5321/5322. Check local part, domain, and TLD. Free, 100% in your browser.
JSON Tree Viewer
Visualize JSON data as an interactive collapsible tree. Expand, collapse, and navigate JSON objects and arrays. Copy JSON paths. Free, 100% in your browser.
chmod Generator
Generate Unix chmod permissions visually. Toggle read, write, and execute for owner, group, and others. Get numeric, symbolic, and command output. Free, 100% in your browser.
CSS to Tailwind Converter
Convert CSS properties to Tailwind CSS utility classes. Supports layout, spacing, typography, colors, and more. See unmatched properties. Free, 100% in your browser.
JSON Repairer
Fix broken JSON automatically: trailing commas, single quotes, unquoted keys, comments, and more. Repair and validate instantly. Free, 100% in your browser.
Glob Pattern Tester
Test glob patterns against file paths in real time. See which paths match your pattern with instant highlighting. Free, 100% in your browser.
Robots.txt Validator
Validate robots.txt syntax and test URL paths against allow/disallow rules for any user-agent. Debug crawling issues instantly. Free, 100% in your browser.
Design & Media
Generate QR codes, barcodes, business cards, color palettes, and CSS effects.
QR Code Generator
Generate QR codes from any text or URL instantly. Customize error correction level and colors. Download as PNG. Free, 100% client-side.
Barcode Generator
Generate barcodes in CODE128, EAN-13, UPC-A, CODE39, and ITF-14 formats. Download as PNG. Free online tool, runs 100% in your browser.
Business Card Generator
Design professional business cards with live preview. Choose themes and layouts, enter your details, and download as PNG. Free, 100% in your browser.
Color Shades Generator
Generate tints and shades for any color. Choose a base color and number of shades, get HEX, RGB, and HSL values instantly. Free, 100% in your browser.
CSS Shadow Generator
Generate CSS box-shadow visually with a live preview. Adjust offsets, blur, spread, color, and opacity. Add multiple layers. Copy the CSS code. Free, 100% in your browser.
CSS Filter Generator
Generate CSS filter effects visually. Adjust blur, brightness, contrast, grayscale, hue-rotate, invert, opacity, saturate, and sepia with live preview. Copy CSS code. Free online tool.
Color Accessibility Checker
Check color contrast ratios against WCAG 2.1 guidelines. Test AA and AAA compliance for normal and large text. Free, 100% in your browser.
Color Mixer
Mix two colors with adjustable ratio. See the result in HEX, RGB, and HSL with a gradient preview and intermediate steps. Free, 100% in your browser.
Complementary Color Generator
Generate complementary, analogous, triadic, split-complementary, and tetradic color schemes from any color. See swatches and copy HEX values. Free, 100% in your browser.
SVG Placeholder Generator
Generate customizable SVG placeholder images with custom dimensions, colors, and text. Copy as SVG, HTML, or data URI. Free, 100% in your browser.
Image Watermark
Add text watermarks to images with custom position, opacity, color, size, and rotation. Supports tiling. Download as PNG or JPEG. Free, 100% in your browser.
Identicon Generator
Generate unique pixel-grid identicons from any text input, like GitHub default avatars. Customize colors and size. Download as PNG. Free, 100% in your browser.