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Developer Tools

Free online developer tools — no signup required.

Free Developer Tools — JSON, Base64, Regex, QR Code and More

Developer utility tools are used dozens of times per day by software engineers, web developers, and technical analysts. Having these tools available instantly in a browser tab — without installing extensions, opening terminal windows, or navigating complex software interfaces — saves significant time in development and debugging workflows.

The JSON formatter validates JSON syntax and shows the exact line and character position of any error — critical when debugging API responses that arrive as compressed single-line strings. The regex tester provides live match highlighting as you type your pattern, with preset patterns for the most commonly needed expressions including email, URL, phone number, IP address, date, and hex colour code validation.

The QR code generator, password generator, UUID generator, Base64 encoder, and URL encoder all generate output entirely within your browser using cryptographically secure random number generation where applicable. No inputs, generated values, or results are transmitted to any server or logged anywhere.

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JSON Formatter
Format, minify and validate JSON instantly
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QR Code Generator
Generate QR codes for any text or URL
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Regex Tester
Test and debug regular expressions instantly
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Password Generator
Generate strong, secure passwords instantly
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Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings
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URL Encoder/Decoder
Encode or decode URL percent-encoded strings
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Markdown Previewer
Write Markdown and see a live HTML preview
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UUID Generator
Generate cryptographically random UUID v4 values
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Hash Generator
Generate MD5, SHA-1 and SHA-256 hashes from text
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HTML Encoder / Decoder
Encode HTML special characters or decode HTML entities
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Image to Base64
Convert any image to Base64 string, data URI and img tag
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CSS Gradient Generator
Build linear or radial gradients visually with live preview
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Password Strength Checker
Analyse password strength with entropy estimate and improvement tips