Free browser tools for developers and everyday technical work.
JSON formatting, QR code generation, Base64 encoding, URL inspection, timestamps, hashing, regex testing, and more. Everything runs locally in your browser with no accounts, uploads, or tracking.
Browse all tools
From JSON formatting and QR generation to SQL queries, regex testing, hashes, timestamps, and file diffs, every tool is built for one job, opens quickly, and stays local.
JSON Formatter / Validator
Free JSON formatter, validator, and minifier with clear local parse feedback.
Base64 Encoder / Decoder
Free Base64 encoder and decoder for UTF-8 text with local processing and strict validation.
QR Code Generator
Free QR code generator for text, URLs, Wi-Fi, email, phone, and SMS with local PNG and SVG export.
URL Encoder / Decoder
Encode or decode full URLs and URL components without overwriting your source text.
Regex Tester
Test ECMAScript regex patterns with flags, capture groups, and replace preview.
Timestamp Converter
Move cleanly between Unix timestamps, local time, and UTC.
Password Generator
Create strong passwords with secure browser randomness.
Text Diff Checker
Compare two text blocks with readable line and inline changes.
SQL Formatter / Minifier
Format or minify SQL locally without executing anything or assuming a specific backend.
Hash Generator
Hash text locally with SHA-256, SHA-384, or SHA-512 using Web Crypto.
UUID Generator
Generate UUID v4 or v7 values locally, one at a time or in bulk.
Query String Parser / Builder
Parse raw query strings into editable rows and rebuild them with repeated keys intact.
.env Parser / Viewer
Inspect dotenv text with comments, quoted values, duplicates, and malformed lines surfaced clearly.
JWT Inspector
Decode JWT headers and payloads locally, then inspect claims and key timestamps safely.
Markdown Previewer
Write Markdown on the left and review a sanitized local preview on the right.
HTML Previewer
Preview HTML in a sandboxed iframe with scripts stripped and unsafe handlers removed.
Slug Generator
Turn titles into clean, lowercase slugs with predictable normalization.
Text Case Converter
Convert text into camelCase, PascalCase, snake_case, kebab-case, title case, and more.
Word / Character Counter
Count words, characters, lines, paragraphs, and estimated reading time locally.
Color Converter
Convert between HEX, RGB(A), and HSL(A) with a live swatch and copy-ready outputs.
Barcode Generator
Generate practical Code 128, EAN-13, and UPC-A barcodes with local SVG and PNG export.
Device / Browser Info
Inspect the current browser environment, including viewport, platform, storage support, and theme preference.
robots.txt Parser / Validator
Parse pasted robots.txt content and surface directives, comments, and malformed lines.
Sitemap XML Parser / Validator
Validate pasted sitemap XML and list the URLs or child sitemap locations it contains.
Handpicked links for when you need more.
Built for speed. Designed for privacy.
Your data stays on your device. No accounts, no cloud storage, no tracking pixels. Just fast, reliable tools that work when you need them, exactly how you expect.