About Onuel Tools

Most online converters work by uploading your input to a server. For a Base64 string that is merely wasteful; for a JWT, an API key or a customer record, it is a real disclosure — you have handed a working credential to a stranger.

Every tool here runs in the browser using standard platform APIs: TextEncoder/TextDecoder for character conversion, Web Crypto for signatures. There is no upload endpoint, because there is nothing to upload to.

• Every page is prerendered to static HTML for each supported language, so it is readable before any JavaScript runs.
• Conversion logic lives in a shared, dependency-free package covered by unit tests against the RFC test vectors.
• Decoders let you choose the character set, because "the bytes are right but the text is garbled" is a different problem from "the decoding failed".
• The site is served as static files from Cloudflare Pages.