Developer Tools

Format, validate and minify JSON online with clear error messages pointing at the failing line.

Pretty-print and validate XML with clean indentation — configs, SOAP payloads, sitemaps, RSS.

Live side-by-side Markdown editor and preview — headings, lists, links, code and tables.

Percent-encode text for safe use in URLs, or decode %-sequences back into readable text.

Encode text to Base64 or decode Base64 back to text — Unicode-safe, entirely in your browser.

Generate one or many random v4 UUIDs using your browser's cryptographic randomness.

Convert Unix timestamps to human dates and back — auto-detects seconds vs milliseconds.

Create a strong random password of any length, drawing from your chosen character types.

Test a regular expression against sample text and see every match, its position and captured groups.

Generate SHA-1, SHA-256 and SHA-512 hashes of any text, computed live in your browser.

Convert colors between HEX, RGB and HSL formats instantly, with a live swatch preview.

Convert CSV data to JSON, or JSON arrays back to CSV, entirely in your browser.

Decode a JWT into its header and payload as pretty JSON, plus an expiry check — no signature verification, nothing leaves your browser.

Convert a whole number between binary, octal, decimal and hexadecimal, with a copy button for each result.

Encode special characters into HTML entities, or decode entities back into plain text.

Escape text for safe use inside a JSON string, or unescape a JSON-escaped string back to plain text.

Paste a URL or query string and see every parameter decoded into a clear key/value table, in order.

Turn a 5-field cron expression into a plain-English sentence describing exactly when it runs.