Developer tools that respect your privacy
Fast, free, offline-capable utilities. Everything runs in your browser. No data ever leaves your machine.
JSON Formatter
Format, validate, and minify JSON with syntax highlighting and tree view.
Base64 Encoder/Decoder
Encode and decode Base64 strings. Supports URL-safe variant and file uploads.
JWT Decoder
Decode JWT tokens. View header, payload, expiry status, and claims.
Regex Tester
Test regular expressions with live highlighting, match groups, and common patterns.
URL Encoder/Decoder
Encode and decode URLs with component parsing and query parameter breakdown.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.
Color Picker & Converter
Pick colors and convert between HEX, RGB, and HSL. Preview swatches and contrast ratios.
Unix Timestamp Converter
Convert between Unix epoch timestamps and human-readable dates. Live clock with UTC and local time.
Diff Checker
Compare two texts side by side. See added, removed, and unchanged lines with highlighting and stats.
Cron Expression Builder
Build cron expressions visually with live preview, human-readable descriptions, and next run times.
Cron Expression Parser
Parse cron expressions into human-readable explanations. See next 5 run times. Supports 5 & 6-field cron.
Markdown Editor & Preview
Write Markdown with a live side-by-side preview. Copy rendered HTML or source. No dependencies.
Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences, or words. Copy to clipboard instantly.
UUID Generator
Generate UUID v4 identifiers. Bulk generate 1–100, with or without hyphens, copy to clipboard.
CSS Minifier & Beautifier
Minify or beautify CSS with one click. See size reduction percentage, copy to clipboard.
JavaScript Minifier & Beautifier
Minify or beautify JavaScript with one click. See size reduction percentage, copy to clipboard.
HTML Entity Encoder/Decoder
Encode special characters to HTML entities and decode back. Named, decimal, and hex formats.
Password Generator
Generate strong, secure passwords. Adjustable length, character sets, strength meter, bulk generate.
SQL Formatter & Beautifier
Format, beautify, and minify SQL queries. Syntax highlighting. MySQL, PostgreSQL, SQLite support.
YAML Validator & Formatter
Validate YAML syntax, format/beautify, convert between YAML and JSON. Error highlighting.
CSS Gradient Generator
Create beautiful CSS gradients visually. Linear & radial, color stops, direction picker, copy CSS with vendor prefixes.
Open Graph Meta Tag Generator
Generate OG & Twitter Card meta tags. Live preview for Facebook, Twitter, LinkedIn. Copy all tags.
CSV Viewer & Editor
Upload, view, sort, filter, and edit CSV files. Add/delete rows and columns, export modified CSV.
SVG Optimizer
Optimize SVG files by removing metadata, comments, empty elements. Prettify or minify. Live preview.
Favicon Generator
Generate favicon.ico + PNG favicons from images, text, or emoji. Download all sizes as a ZIP file.
Chart & Graph Generator
Create bar, line, pie, and doughnut charts from CSV data. Customize colors and styles. Export as PNG or SVG.
QR Code Generator
Generate QR codes from text or URLs. Add a custom logo in the center. Download as PNG. 100% private.