Private browser tools

Developer tools that keep pasted text local.

Format, minify, convert, encode, decode, compare, and hash without sending snippets away from this browser tab.

Formatters

Code formatters for JSON, JavaScript, CSS, HTML, Python, SQL, XML, YAML, and more.

Minifiers

Browser minifiers for JSON, JavaScript, TypeScript, CSS, SCSS, and XML.

JSON Tools

Use private JSON tools for viewing, sorting, diffing, CSV export, and YAML conversion in your browser with no upload.

Web Encoding Tools

Encode URLs, decode Base64, and test regular expressions locally in your browser without sending text to a server.

Data Converters

Convert JSON, YAML, XML, and CSV-friendly data locally in your browser. No upload and no account required.

Security Utilities

Decode JWTs, generate hashes, and inspect encoded text locally in your browser. HappyFormatter does not upload your input.

Color Tools

Convert HEX, RGB, and HSL colors locally in your browser with a privacy-friendly color converter.

Utility pages

Browser-only helpers

13 utility tools

JSON Tools

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JSON Viewer

View, check, and pretty-print JSON locally in your browser. Paste JSON and inspect the formatted output without uploading data.

Open
JSON Sort Keys

Sort JSON object keys recursively in your browser for stable snapshots, readable config files, and easier diffs.

Open
JSON Diff

Compare two JSON documents in your browser and see added, removed, and changed paths without uploading either document.

Open

Web Encoding Tools

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Regex Tester

Test JavaScript regular expressions locally in your browser and inspect matches without uploading sample text.

Open
URL Encoder/Decoder

Encode and decode URL components locally in your browser for query strings, paths, and copied links.

Open

Data Converters

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JSON to YAML

Convert JSON to readable YAML locally in your browser for config files, docs, and infrastructure snippets.

Open
YAML to JSON

Convert simple YAML documents to JSON in your browser. Useful for config snippets, examples, and structured notes.

Open
JSON to CSV

Convert arrays of JSON objects to CSV locally in your browser for spreadsheets, reports, and quick exports.

Open
XML to JSON

Convert XML documents to JSON locally in your browser for quick inspection, API work, and migration notes.

Open

Security Utilities

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JWT Decoder

Decode JWT headers and payloads locally in your browser. Inspect token claims without uploading the token.

Open
Hash Generator

Generate SHA-256, SHA-1, SHA-384, and SHA-512 hashes locally in your browser with no upload.

Open

Color Tools

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Color Converter

Convert HEX, RGB, and HSL colors locally in your browser for CSS, design systems, and quick checks.

Open