String & ID Formatter

Every codebase carries naming conventions: JavaScript variables in camelCase, database columns in snake_case, CSS classes and URL slugs in kebab-case, React components in PascalCase, environment variables in CONSTANT_CASE. Moving a field between layers means rewriting the same word in a different shape, over and over.

Encoding is the neighbouring chore. Base64 turns arbitrary text or binary data into an ASCII-safe string for headers, data URIs and tokens. Percent-encoding does the same job for URL components so that spaces, ampersands and slashes survive being placed in a query string. Both are reversible, and both are easy to get subtly wrong by hand.

UUID v4 generation rounds it out: a 122-bit random identifier you can drop into a test fixture, a seed script, or a message key without coordinating with anything else.

Everything happens in your browser. Base64 payloads and identifiers frequently contain credentials or personal data, so a converter that posts your input to a backend is a bad habit. This one has no backend to post to.

Case conversion shows every variant at once instead of making you pick a target first, so you can copy whichever one you actually needed. Encoding uses the browser's own UTF-8-aware APIs, which means emoji and non-Latin scripts round-trip correctly rather than producing mojibake.

UUIDs come from the platform's cryptographic random source, not Math.random.

1. Choose a mode: Case convert, Base64, URL encode, or UUID v4.
2. For text modes, paste your input on the left.
3. For Base64 and URL, toggle between Encode and Decode.
4. Read the results on the right — case conversion shows every variant at once.
5. For UUIDs, choose how many you need and press Generate.
6. Press the copy button beside any result to put it on your clipboard.