Base64 Encoder & Decoder

It converts text to Base64 and back. Encoding is UTF-8 safe, so emoji and accented characters round-trip correctly; decoding tolerates whitespace and missing padding. Turn on URL-safe to use the - and _ alphabet without padding, as used in URLs and JWTs.

Yes. Everything is computed locally in your browser — nothing is sent to a server. Note that Base64 is encoding, not encryption: it is trivially reversible and must never be used to protect secrets. Uptimeify is EU-built and EU-hosted, so the tool keeps your data off US infrastructure and clear of US Cloud Act exposure.

All over the place — Basic Auth headers, data URIs, webhook signatures and JWT segments are Base64. Decode them here to debug an integration, then let Uptimeify watch the endpoint or webhook in production so you catch failures the moment they happen.