The dev tools
you actually
use every day.

Inspect the header, payload and signature text of a three-part JWT. Numeric date claims are shown in UTC, with an expiry status based on your device clock. Decoding does not verify the signature, issuer or audience.

Format JSON with two or four spaces, or remove whitespace with Minify. Invalid JSON produces an input error. Use this to inspect an API response or check a configuration file before copying it back.

Test a JavaScript regular expression against sample text. Toggle flags, inspect highlighted matches, and read numbered or named capture groups. Enter the pattern without surrounding slashes.

Encode text for a URL component, such as one query parameter value, or decode percent-encoded text. Spaces become %20. Paste a value rather than a complete URL when you want to preserve the URL structure.

Encode UTF-8 text as Base64 or decode Base64 back to text. Use Swap to move a result into the opposite mode and check a round trip. This tool handles text, not file uploads or image previews.

Generate a random password in your browser. Choose a length from 8 to 64 characters and select uppercase letters, lowercase letters, digits or symbols. Each selected character group is represented in the result.

Generate random UUID v4 identifiers using your browser. Keep or remove hyphens, change letter case, and copy one value or the last five generated values. Use these identifiers for test fixtures or record IDs.

Convert Markdown to sanitized HTML and inspect it in a preview. Try headings, lists, links, fenced code or GitHub-style tables, then copy the HTML for your publishing workflow.

View eight case conversions for the same text, including uppercase, lowercase, title case, sentence case, camelCase, snake_case, kebab-case and CONSTANT_CASE. Copy the result that fits a label or code identifier.

Count words, characters, lines and paragraphs as you type. Copy the statistics for a draft or length check. Reading time uses 200 words per minute; speaking time uses 130, both rounded up to whole minutes.

Estimate reading time from the word count and a speed you choose. Adjust the slider from 100 to 500 words per minute to model a slower or faster reader. The default is 200 words per minute.

Resize one image to exact pixel dimensions in your browser. Keep its aspect ratio or set width and height separately, then choose Auto, PNG, JPEG or WebP output. Preview the result and compare its dimensions and file size before downloading.