All tools

33 free tools across 5 categories — every one of them runs locally in your browser. Nothing to install, nothing to sign up for, nothing uploaded.

Developer Tools

Convert and format CSV, JSON, XML, YAML, SQL, CSS, Markdown and HTML locally in your browser.

JSON Formatter

Beautify, minify and validate JSON with instant error reporting.

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JSON Validator

Check JSON without changing it — clear engine errors and a structure summary in your browser.

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Base64 Encoder / Decoder

Convert text to Base64 and back — UTF-8 safe, strict validation, nothing leaves your browser.

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URL Encoder / Decoder

Percent-encode text, decode URLs safely, and convert form data — nothing leaves your browser.

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XML Formatter / Minifier / Validator

Format, minify and validate XML safely — preserve structure and content, nothing leaves your browser.

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HTML Formatter / Minifier / Validator

Format, minify and structurally validate HTML safely — nothing leaves your browser.

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CSV to JSON Converter

Convert CSV rows into JSON objects while preserving every cell as text.

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JSON to CSV Converter

Turn an array of JSON objects into a spreadsheet-friendly CSV file.

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XML to JSON Converter

Convert XML elements, attributes and repeated nodes into a JSON structure.

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JSON to XML Converter

Turn JSON objects and arrays into structured XML documents.

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YAML Formatter

Clean up YAML indentation and spacing without sending configuration data anywhere.

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SQL Formatter

Make SQL queries easier to read with consistent clause layout and indentation.

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CSS Formatter & Minifier

Format CSS rules or compact whitespace for smaller stylesheets.

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Markdown Editor

Write Markdown and see a sanitized live preview as you type.

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Markdown to HTML Converter

Convert Markdown documents into sanitized HTML.

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HTML to Markdown Converter

Turn HTML headings, links, lists and text into Markdown.

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