Online Coding Tools For Free

Free online developer tools for everyday web work: format and validate JSON, beautify or minify code, encode and decode strings, and share snippets as images.

Paste, click and copy, with nothing to install.

Coding Tools Collection

Code to Image Converter

Convert your codes to fancy images and share with your friends or colleagues

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URL Slug Generator

Generate SEO-friendly slugs from titles or any other strings for your webpages or blog posts

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React Native Shadow Generator

Generate fancy box shadows in React Native both for iOS and Android

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Base64 Encoder/Decoder

Encode your strings to Base64 or decode strings encoded with Base64

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HTML Encoder/Decoder

Encode or decode your HTML by replacing special characters into equivalent escape forms

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URL Encoder/Decoder

Encode your URL by escaping characters that may break your navigation and decode it

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HTML Minifier

Minify your HTML code and copy the minified code to your clipboard or download as .html file

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CSS Minifier

Minify your CSS code and copy the minified code to your clipboard or download as style.min.css file

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JavaScript Minifier

Minify your JavaScript code and copy the minified code to your clipboard or download as .min.js file

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HTML Formatter

Format your HTML code with HTML beautifier and either copy the formatted HTML or download it

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CSS Formatter

Format your CSS code and copy the beautified code to your clipboard or download as style.css file

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JavaScript Formatter

Format/beautify your JavaScript code and copy the formatted code to your clipboard or download as a file

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JSON Formatter

Format, beautify and minify JSON as you type, repair broken JSON and explore it as a tree, without rounding big numbers

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JSON Validator

Validate JSON with every error found and explained at once, one-click fixes, and checks against a JSON Schema

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JSON Tree Viewer

View your JSON data in tree view, walk through all branches and update nodes if you need to

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HAR Viewer

Open a HAR file: a waterfall of every request, failed, slow and uncompressed requests found for you, and any request as cURL

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HAR Sanitizer

Remove cookies, tokens, API keys and passwords from a HAR file before sharing it, in your browser, checked again afterwards

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Sorting Algorithm Visualizer

Watch 28 sorting algorithms sort step by step or race each other, with a timeline, sound, counts and code in JavaScript and Python

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Top Coding Tools On The Web

Format and validate JSON

Paste JSON into the JSON Formatter to indent, sort or minify it as you type, repair broken JSON and browse it as a tree without rounding big numbers. The JSON Validator lists every error at once with a plain explanation, fixes them in one click and checks the data against a JSON Schema.

Format and minify

Make minified or messy code readable with the HTML, CSS and JavaScript formatters, and shrink it again for production with the JavaScript Minifier and its HTML and CSS counterparts.

Encode and decode

Convert strings to and from Base64, URL and HTML encoding, and make clean, readable URLs from titles with the URL Slug Generator.

Inspect and share

Explore large API responses with the JSON Tree Viewer, turn a snippet into a polished image for a post or slide with the Code to Image Converter, and get shadow styles for both iOS and Android with the React Native Shadow Generator.

Debug network traffic

Open a HAR file from your browser with the HAR Viewer: a waterfall of every request, failed, slow and uncompressed requests found for you, and any request copied as cURL. Before sending the file to a support team, remove its cookies, tokens and passwords with the HAR Sanitizer.

Learn algorithms

Watch 28 sorting algorithms sort step by step, race them on the same data and read their code with the Sorting Algorithm Visualizer.