Free Developer Tools

Validate, format, or minify JSON without changing large numbers.

Generate random version 4 UUIDs using browser cryptography.

Encode or decode a full URL or a single URL parameter.

Check JSON syntax and locate errors by line and column without rewriting the document.

Remove insignificant JSON whitespace while preserving number literals exactly.

Explore valid JSON as a collapsible tree with exact source values for large numbers.

Indent XML elements while preserving mixed-content text and xml:space. External entities are rejected.

Remove indentation between XML elements while retaining text content, comments and CDATA.

Encode UTF-8 text, including accents and emoji, as standard Base64.

Decode standard Base64 or Base64URL into UTF-8 text and report invalid input.

Percent-encode a URL component such as a query value, including spaces and Unicode.

Decode percent-encoded URL components. A plus sign remains a literal plus sign.

Convert Unix seconds or milliseconds to UTC and convert an ISO date back to Unix time.

Escape the five special HTML characters so markup can be displayed as text.

Decode named and numeric HTML entities into text without executing the decoded markup.

Read JWT header and payload locally. Decoding does not verify the signature or establish trust.

Test JavaScript regular expressions against text in a cancellable worker with a time limit.