All-in-one developer utilities that run entirely in your browser. Fast, private, and always free.
Explore ToolsBeautify, validate and format JSON data, support compression and expansion
Convert between timestamps and date time, support seconds and milliseconds
Multi-algorithm hash, HMAC and AES encryption helper
Text / image / file Base64 encode & decode in one place
Percent-encode & decode URL components or full URLs
Decode & verify JSON Web Tokens with HS/RS algorithms
Compare two texts side by side with line & character-level highlighting
Compress JPEG/PNG/WebP locally with quality & size constraints
Test and debug regular expressions, view matching results in real-time
Generate UUID v1 / v4 / v7 in batches with one-click copy
Convert between JSON and YAML with error hints
Convert HEX / RGB / HSL and preview accessibility-safe colors
Generate QR codes for text and URLs locally in your browser
Generate secure random passwords with custom rules
Parse cron expressions to human-readable text and next run times
Live Markdown editor with GFM preview and code highlight
Beautify and minify SQL with dialect support
Encode and decode HTML entities and special characters
Convert between binary, octal, decimal and hexadecimal
Generate placeholder text and random names, emails, phones