Base64 Encoder/Decoder
Encode and decode Base64 strings instantly
About Base64 Encoder/Decoder
How Base64 Encoder/Decoder Works
Encodes and decodes binary-to-text data compliant with IETF RFC 4648 using standard and URL-safe alphabets. All conversions execute synchronously in browser memory via native Web APIs with 0 external network requests, safeguarding authentication headers and data URIs.
The Base64 Encoder and Decoder converts text to and from Base64, a standard encoding that represents binary data as ASCII characters. A typical use case is embedding small images, tokens, or credentials safely inside JSON, URLs, or configuration files where raw bytes would break parsing. You can flip between encode and decode instantly to inspect what a given string actually contains. All conversion happens locally, so nothing you type is uploaded. Developers frequently use it to decode Authorization headers, data URIs, or encoded email content during debugging. It is a simple, dependency-free way to make binary-safe text without leaving the browser.
Frequently asked questions
Is Base64 encryption?+
No. It is reversible encoding, not encryption, and offers no confidentiality.
Can it encode files?+
It encodes text. Binary files need a file reader before they can be represented.
Is my input uploaded?+
No. Encoding and decoding run entirely in your browser.
Limitations
Base64 increases size by about a third and provides no security. It is not suitable for large binary payloads.