Free coding tools (JSON, Base64, JWT)

Pretty-print JSON.

Tree view for JSON documents.

Validate JSON and show errors.

Pretty-print JavaScript.

Minify JavaScript.

Pretty-print HTML.

Minify HTML.

Pretty-print CSS.

Minify CSS for production.

Test a regular expression against sample text.

Pretty-print basic SQL queries.

Encode and decode Base64 text.

Percent-encode and decode URLs.

Escape and unescape HTML entities.

Inspect and build JWT payloads.

Encode an image file as Base64.

Encode a PDF as Base64.

Convert colour values between HEX and RGB.

Slugify titles for URLs.

SHA-256 and SHA-1 hashes of text or a file.

Mint random UUID v4 values.

Generate strong random passwords.

Unix seconds ↔ readable date (UTC / local).

Build or parse URL query parameters.

Convert between binary, octal, decimal, and hex.

Compare two blocks line by line.

Render Markdown to simple HTML.

Convert numbers ↔ Roman numerals.

Percent of, change, and reverse percent.

Convert length, weight, temperature, and data sizes.

Turn a 5-field cron into plain English.

Convert CSV tables to JSON.

Convert XML to JSON.

Convert YAML to JSON.

Parse stringified JSON safely.

Build basic SEO / Open Graph meta tags.

Generate a palette from a seed HEX colour.