Developer Toolbox

Visually design rounded corners and copy the CSS.

Build layered CSS shadows and copy the code.

Design linear, radial, and conic gradients visually.

Turn titles into clean, URL-safe slugs — one at a time or in bulk.

Build trackable campaign links for Google Analytics.

Generate title, description, and robots meta tags.

Build social-share meta tags with a live card preview.

Build crawler rules with a live preview.

Generate JSON-LD structured data for rich search results.

Instant strength meter and crack-time estimate.

Compute and verify SHA-1/256/384/512 checksums.

Check carrier info and spam reports for any phone number.

Shrink JS with Terser — mangle, compress, strip comments.

Strip comments and whitespace from CSS safely.

Strip comments and collapse whitespace safely.

Combine any files into a single ZIP archive.

Browse a ZIP archive and download just what you need.

Turn a list of URLs into a valid sitemap.xml.

Pretty-print, minify, and validate JSON with exact parser errors.

Encode or decode text and files to/from Base64.

Percent-encode or decode URLs and query values.

Generate RFC-4122 v4 UUIDs, one at a time or in bulk.

Test patterns live with match highlighting and capture groups.

Convert Unix timestamps to dates and back, two-way.

Convert HEX, RGB, and HSL live, plus nearest named color and WCAG contrast.

Decode a JWT's header and payload, with expiry highlighted.

Encode text to HTML entities or safely decode them back.