QR codes, password generator, JSON formatter, contrast checker, and more tools for developers.
Generate QR codes with custom size, colors, and error correction level.
Generate secure random passwords with configurable length and character types.
Pretty-print or minify JSON data with syntax validation.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
Generate random UUID v4 identifiers in bulk.
Convert between Unix timestamps and human-readable dates.
Test regular expressions with live matching and capture group display.
Check WCAG color contrast ratios between foreground and background colors.
Write and preview code with syntax highlighting for 20+ languages.
Render LaTeX math equations with live preview.
Create beautiful CSS gradients with a visual builder.
Design CSS box shadows with a visual editor.
Developer tools for everyday coding tasks: format JSON, generate hashes, create QR codes, check color contrast, encode/decode URLs, and more — all free and in-browser.
Stop switching between tabs and online tools. ProUtils developer tools are fast, keyboard-friendly, and available offline once your browser has cached the page.
We offer JSON Formatter, Hash Generator (MD5, SHA-1, SHA-256), QR Code Generator, Password Generator, Color Contrast Checker, Base64 Encoder, URL Encoder, and more.
Once you've visited a tool, most assets are cached by the browser. Reloading the page without internet will still work for most tools.
Yes. Our password generator uses the browser's crypto.getRandomValues() API, which is cryptographically secure.