DevToolXBase64 Encoder/Decoder
Encode text to Base64 or decode Base64 to text
About Base64 Encoder/Decoder
Base64 encoding converts binary data into a string of ASCII characters, making it safe to transmit over text-only protocols like email, JSON APIs, or URLs. It is not encryption — anyone can decode the output, the sole purpose is compatibility. This tool converts instantly between Base64 and UTF-8 text, useful for debugging API payloads, embedding small assets, and building Basic Auth headers.
Common Use Cases
Frequently Asked Questions
How much does Base64 inflate my data?
Roughly 33%. Every 3 bytes of input become 4 Base64 characters, plus padding. That is why Base64 is not suitable for large assets — use it only for small payloads where compatibility matters more than size.
Is Base64 a form of encryption?
No. Base64 is an encoding, not a cipher. Anyone can decode it in seconds. If you need confidentiality, use encryption such as AES-GCM on top of Base64.
Why do Base64 strings sometimes end with = signs?
Those are padding characters, added when the input length is not divisible by 3. Padding is required by the standard so decoders can recover the exact byte count.
What is URL-safe Base64?
A variant that replaces + with - and / with _ so the encoded string can be placed in URLs without further escaping. JWT uses URL-safe Base64 (with padding stripped).