Free developer tools
Handy utilities for everyday development — generators, encoders, formatters and testers. Everything runs in your browser: fast, private, and free forever.
Generators
Password Generator
Generate strong, random passwords with a cryptographically secure RNG — entirely in your browser.
UUID Generator
Generate one or a hundred v4 UUIDs at once — cryptographically random, copy individually or all together.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug — accents stripped, separators your choice.
QR Code Generator
Generate QR codes for URLs, text or Wi-Fi — pick size and error correction, download as PNG.
Encoding & Hashing
Base64 Encoder / Decoder
Encode text to Base64 or decode it back — UTF-8 safe, with URL-safe variant support.
URL Encoder / Decoder
Percent-encode strings for safe use in URLs, or decode %20-style sequences back to text.
JWT Decoder
Decode a JSON Web Token's header and payload, check expiry, and verify HS256 signatures.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes of any text — instantly, in your browser.
HTML Entity Encoder / Decoder
Escape text for safe HTML embedding or decode &-style entities back to plain text.
Image to Base64
Convert an image to a Base64 data URI with ready-to-paste HTML and CSS snippets — fully offline.
Formatting
JSON Formatter / Validator
Validate JSON with precise error locations, then pretty-print or minify it — with sorted keys if you like.
HTML / CSS / JS Minifier
Strip comments and whitespace from HTML, CSS or JavaScript and see exactly how many bytes you saved.
SQL Formatter
Pretty-print SQL queries with dialect-aware formatting for Postgres, MySQL, SQLite and more.
Data & Text
Lorem Ipsum & Fake Data
Placeholder paragraphs plus fake names, emails, phone numbers and addresses for testing UIs.
JSON ↔ CSV Converter
Convert JSON to spreadsheet-ready CSV or CSV back to JSON — nested objects flattened, both directions.
Regex Tester
Test regular expressions against your text with live match highlighting and capture groups.
Diff Checker
Compare two blocks of text or code line by line and see exactly what was added or removed.
Word Counter
Count words, characters, sentences and paragraphs with reading and speaking time estimates.
Text Case Converter
Convert text between camelCase, snake_case, kebab-case, PascalCase, Title Case and more.
Number Base Converter
Convert numbers between binary, octal, decimal, hex — or any base from 2 to 36 — instantly.
Color Converter
Convert colors between HEX, RGB and HSL with a live swatch preview and one-click copy.
Chmod Calculator
Build Linux file permissions visually and get the octal (755) and symbolic (rwxr-xr-x) forms.
YAML ↔ JSON Converter
Convert YAML to JSON or JSON to YAML with validation and precise parse-error messages.
INI / ENV / JSON Converter
Convert between .ini files, .env files and JSON — paste any one, get the other two.
Time & Scheduling
Unix Timestamp Converter
Convert Unix / epoch timestamps to human-readable dates and back — UTC, local and relative time.
Time Zone Converter
Convert a time between any two time zones with automatic daylight-saving handling.
Cron Expression Generator
Build and understand cron schedules with a live plain-English description and next run times.
SEO & Web
Meta Tag Generator
Generate SEO meta tags plus Open Graph and Twitter cards, with a live search-result preview.
robots.txt Generator
Build a correct robots.txt with per-agent allow/disallow rules, crawl delay and sitemap URL.
HTTP Status Codes
Searchable reference of every HTTP status code with plain-English explanations and fixes.
Network
Online API Testing Tool
Send GET/POST/PUT requests with custom headers and body — a lightweight Postman in your browser.
WebSocket Tester
Connect to a WebSocket endpoint, send messages and watch the live message log in real time.
What Is My IP
See your public IP address, user agent and request headers as servers receive them.
DNS Lookup
Query A, AAAA, MX, TXT, NS, CNAME and SOA records for any domain — results in milliseconds.
SSL Certificate Checker
Inspect any site's TLS certificate — issuer, expiry countdown, SANs — works for wss:// too.
Free tools are just the start
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