Developer tools that just work.
Format JSON, decode Base64, test regex, compress images and more. No signups, no uploads, no waiting: everything runs right in your browser.
Popular tools
JSON Formatter
Format, validate, and beautify JSON online. 100% client-side, your data never leaves your browser.
Lorem Ipsum Generator
Generate placeholder text, words, sentences, or paragraphs. Classic lorem ipsum plus alternatives (hipster, cupcake, pirate). HTML-wrapped output option.
Word Counter
Count words, characters, sentences, paragraphs, and lines. Reading time estimate, char-limit indicators for X, LinkedIn, meta titles, and more.
Base64 Encoder / Decoder
Encode and decode Base64 strings and files. Client-side, safe for sensitive data.
Regex Tester
Test regular expressions with live match highlighting and explanation.
QR Code Generator
Generate QR codes for URLs, text, Wi-Fi, contact cards. Custom size, colors, error correction. Download as PNG or SVG. 100% client-side.
Password Generator
Generate strong random passwords with configurable length, character classes, and exclusions. Real entropy meter, crack-time estimate, bulk mode.
Image Compressor
Compress JPEG, PNG, and WebP images in your browser. Adjustable quality, batch mode. Files never leave your device.
Recently added
24 Game Solver
Find all unique expressions that equal 24 from four numbers using basic arithmetic operations.
3 Phase Power Calculator
Compute real, apparent and reactive power plus current for balanced three-phase AC circuits from line voltage, amps and power factor.
ABV Calculator
Calculate alcohol by volume (ABV) from original and final specific gravity readings for beer, wine, or cider.
Acres to Hectares Converter
Convert acres to hectares and back using the exact international conversion factor for land area measurements.
Acres to Square Feet Converter
Convert acres to square feet and vice versa using the exact factor of 43,560 square feet per acre.
Acronym Generator
Generate acronyms and abbreviations from any phrase with initials, creative word picks and multiple options.
Age Calculator
Enter a birth date to calculate age in years, months, days, total days lived, and time until the next birthday.
Alien Name Generator
Produces bizarre, unpronounceable alien names using apostrophes and unusual consonant clusters for your sci-fi projects.
Every tool, by category
412 tools in 20 categories. Each card shows the first 15, open a category for the rest, or press / to search.
{}Data & Format 17
JSON, XML, YAML, CSV, SQL, HTML and Markdown: format, view, convert and diff.
64Encoding & Crypto 19
Base64, URL, JWT, hashes, UUID, binary, QR codes and passwords.
>_Dev Productivity 8
Regex, cron, timestamps, subnets, validators and everyday developer utilities.
[]Frontend & Design 14
CSS generators, color tools, image tools, favicons and px to rem.
AaText Tools 23
Counters, case converters, cleaners, formatters and everyday text utilities.
✦Fonts & Symbols 28
Fancy text, text effects, copy and paste symbols, emoticons and special characters.
NmName Generators 31
Names for people, pets, bands, teams, businesses, characters and usernames.
#?Random & Games 42
Random pickers, dice, coin flips, wheels, party games and test data generators.
±Math Calculators 35
Algebra, fractions, factors, exponents, logarithms and everyday arithmetic.
△Geometry 16
Area, perimeter, volume and surface area of shapes, plus triangles and coordinates.
σStatistics & Probability 16
Averages, deviation, distributions, hypothesis tests, probability and combinatorics.
$Finance 28
Loans, interest, investing, margins, taxes, salary and business calculators.
♥Health & Fitness 11
BMI, calories, macros, heart rate, hydration and training calculators.
⏱Date & Time 22
Dates, durations, ages, business days, calendars and time arithmetic.
ΩScience & Engineering 21
Physics, chemistry and electrical formulas with the working shown.
⌂Construction & DIY 12
Concrete, paint, flooring, roofing, lumber and home improvement estimators.
A+Education & Grades 4
Grade, GPA and exam calculators and study helpers.
cmLength & Distance 16
Convert meters, feet, inches, miles, kilometers and every other length unit.
kgWeight & Volume 30
Convert kilograms, pounds, ounces, liters, gallons, cups and cooking measures.
°CTemperature, Speed & Data 19
Temperature, speed, pressure, energy, power and digital storage converters.
Latest guides
AVIF Image Format: Better Compression Than WebP and JPEG
AVIF offers 50% smaller files than JPEG at equivalent quality. Learn browser support, how to convert images to AVIF with sharp and ffmpeg, and how to serve AVIF with WebP and...
AWS EventBridge Scheduler: Cron Schedules for Lambda and AWS Services
AWS EventBridge Scheduler runs Lambda functions, ECS tasks, and other AWS targets on a cron or rate schedule. Learn how to create schedules with cron expressions, handle...
Base64 PDF Embedding: Inline PDFs in HTML, JSON APIs, and Email
Embed PDF files as Base64 strings in HTML data URIs, JSON API responses, and email attachments. Learn when Base64 embedding makes sense, the size overhead, and alternatives...
Base64 vs Hex Encoding: When to Use Each
Compare Base64 and hex encoding for binary data. Learn which is more compact, when to use each in APIs, cryptography, and storage, with JavaScript and Python examples.
bcrypt Password Hashing: Why You Should Use bcrypt and How to Implement It
bcrypt is the standard password hashing algorithm for web applications. Learn why MD5 and SHA-256 are wrong for passwords, how bcrypt's work factor prevents brute-force...
Binary Arithmetic: Addition, Subtraction, and Two's Complement
Learn how computers perform binary arithmetic: binary addition with carry, two's complement for negative numbers, overflow detection, and how CPUs handle integer operations in...
Built to be used, not to sell you something
Every tool runs 100% in your browser. Your data never touches our servers, so you can paste production JSON or tokens without worry.
No server round-trips and no loading spinners. Results update as you type.
No accounts, no paywalls, no “sign up to download”. Open the page, use the tool, leave.