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Developer Tools

14 free tools

Format, validate, and transform code and data directly in your browser. Developer-focused utilities for JSON, encoding, hashing, and more — all processing happens locally.

Developer Tools

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Internet Speed Test

Test your internet download, upload speed, and latency.

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JSON Formatter

Format, validate, minify, and explore JSON with a tree view.

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IP Address Lookup

Look up geolocation, ISP, and network details for any IP.

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Regex Tester

Test regular expressions with real-time matching and capture groups.

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URL Encoder / Decoder

Encode or decode special characters for URLs instantly.

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CSV to JSON

Convert CSV data to JSON arrays or objects instantly.

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Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.

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Markdown to HTML

Convert Markdown to clean HTML with live preview.

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Cron Generator

Build and explain Unix cron schedule expressions visually.

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Color Palette Generator

Generate harmonious color palettes from any base color.

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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal.

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Binary to Text Converter

Convert binary code to text and text to binary.

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Contrast Checker

Check WCAG color contrast ratios for accessibility compliance.

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Screen Ruler

Measure pixels on screen with a draggable overlay ruler.

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About these developer tools▼

Developers spend a surprising amount of time on data transformation tasks — formatting JSON responses, encoding URLs, generating hashes, testing regular expressions, and converting between number bases. These are not the glamorous parts of software engineering, but they are essential and come up multiple times a day.

Toobits developer tools run entirely in your browser using native JavaScript APIs. The JSON formatter validates, pretty-prints, minifies, and renders interactive tree views of JSON data. The regex tester provides real-time pattern matching with capture group extraction and find-and-replace preview. The hash generator computes MD5, SHA-1, SHA-256, SHA-512, and SHA-3-256 from text or files using the Web Crypto API. The cron generator builds and explains Unix cron expressions visually.

All data processing happens locally. Your API responses, configuration files, code snippets, and test data never leave your device. This is especially important for developers working with production data, API keys, or any information that should not be transmitted to external services.

Frequently asked questions

Yes, completely free. No subscription, no signup, no limits.

No. All processing happens entirely in your browser using native JavaScript. Your data never leaves your device.

Once the page is loaded, most developer tools work without an internet connection since all processing is client-side.

Yes. All tools are fully responsive and tested on iOS and Android browsers.

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