Developer Tools

Format and beautify JSON into clean, readable output in one click.

Check JSON for errors and see exactly where the problem is.

Strip whitespace and comments to make JSON as small as possible.

Format and beautify JSON into clean, readable output in one click.

Convert JSON files to CSV in your browser — fast, free and private.

Convert CSV files to JSON in your browser — fast, free and private.

Convert JSON files to XML in your browser — fast, free and private.

Convert XML files to JSON in your browser — fast, free and private.

Convert JSON files to YAML in your browser — fast, free and private.

Convert YAML files to JSON in your browser — fast, free and private.

Open and explore JSON in a readable, collapsible view.

Open and explore JSON Tree in a readable, collapsible view.

JSON Diff — a free json tool in the Tools4U Developer Tools collection.

JSON Escape — a free json tool in the Tools4U Developer Tools collection.

JSON Unescape — a free json tool in the Tools4U Developer Tools collection.

Base64 Encode — a free encoding tool in the Tools4U Developer Tools collection.

Base64 Decode — a free encoding tool in the Tools4U Developer Tools collection.

URL Encode — a free encoding tool in the Tools4U Developer Tools collection.

URL Decode — a free encoding tool in the Tools4U Developer Tools collection.

HTML Encode — a free encoding tool in the Tools4U Developer Tools collection.

HTML Decode — a free encoding tool in the Tools4U Developer Tools collection.

Unicode Encode — a free encoding tool in the Tools4U Developer Tools collection.

Unicode Decode — a free encoding tool in the Tools4U Developer Tools collection.

Decode JWT safely in your browser — nothing is uploaded.

Generate JWT instantly with sensible, copy-ready defaults.

Encode HTML Entity correctly for safe use in code and URLs.

Decode HTML Entity safely in your browser — nothing is uploaded.

Generate UUID instantly with sensible, copy-ready defaults.

Check UUID for errors and see exactly where the problem is.

Generate UUID v4 instantly with sensible, copy-ready defaults.

Generate ULID instantly with sensible, copy-ready defaults.

Generate NanoID instantly with sensible, copy-ready defaults.

Generate Random ID instantly with sensible, copy-ready defaults.

Generate MD5 instantly with sensible, copy-ready defaults.

Generate SHA-1 instantly with sensible, copy-ready defaults.

Generate SHA-256 instantly with sensible, copy-ready defaults.

Generate SHA-512 instantly with sensible, copy-ready defaults.

Generate SHA-3 instantly with sensible, copy-ready defaults.

Generate HMAC instantly with sensible, copy-ready defaults.

Identify Hash from its shape and length.

Test Regex against real samples and see matches highlighted live.

Check Regex for errors and see exactly where the problem is.

Generate Regex instantly with sensible, copy-ready defaults.

Test Regex Replace against real samples and see matches highlighted live.

Regex Explanation Tool — a free regex tool in the Tools4U Developer Tools collection.

Format and beautify SQL into clean, readable output in one click.

Strip whitespace and comments to make SQL as small as possible.

Check SQL for errors and see exactly where the problem is.

Format and beautify SQL into clean, readable output in one click.

Convert SQL files to JSON in your browser — fast, free and private.

Convert JSON files to SQL in your browser — fast, free and private.

SQL Query Builder — a free sql tool in the Tools4U Developer Tools collection.

SQL Formatter for MySQL — a free sql tool in the Tools4U Developer Tools collection.

SQL Formatter for PostgreSQL — a free sql tool in the Tools4U Developer Tools collection.

Format and beautify HTML into clean, readable output in one click.

Format and beautify CSS into clean, readable output in one click.

Format and beautify JavaScript into clean, readable output in one click.

Format and beautify PHP into clean, readable output in one click.

Format and beautify Python into clean, readable output in one click.

Format and beautify XML into clean, readable output in one click.

Format and beautify YAML into clean, readable output in one click.

Format and beautify Markdown into clean, readable output in one click.

Convert Timestamp accurately, with results updating as you type.

Generate Unix Timestamp instantly with sensible, copy-ready defaults.

Look up HTTP Status Code instantly from a searchable reference.

Look up MIME Type instantly from a searchable reference.

Parse User-Agent and read every part of it clearly.

Look up IP Address instantly from a searchable reference.

Check Port and get a plain-English verdict you can act on.

Generate Cron Expression instantly with sensible, copy-ready defaults.

Parse Cron Expression and read every part of it clearly.

Generate .htaccess instantly with sensible, copy-ready defaults.

Generate Robots.txt instantly with sensible, copy-ready defaults.

Generate Sitemap instantly with sensible, copy-ready defaults.

Work out Chmod in seconds with a clear, step-by-step breakdown.

Convert HEX files to RGB in your browser — fast, free and private.

Convert RGB files to HEX in your browser — fast, free and private.

Convert HEX files to HSL in your browser — fast, free and private.

Convert HSL files to RGB in your browser — fast, free and private.

Check Color Contrast and get a plain-English verdict you can act on.

Generate CSS Gradient instantly with sensible, copy-ready defaults.

Generate Box Shadow instantly with sensible, copy-ready defaults.

Generate CSS Border Radius instantly with sensible, copy-ready defaults.