Base64

Base64 is a binary-to-text encoding that represents arbitrary bytes using 64 printable ASCII characters (A–Z, a–z, 0–9, plus + and /). It exists so binary data — images, archives, cryptographic keys — can pass unchanged through channels that were designed for text only.

This tool encodes and decodes both plain text and files. Everything runs client-side in your browser: the input never leaves your machine, which makes it safe for tokens, private keys, and other sensitive data.

How to use it

• Encode text: pick the Encode / Text mode, paste your string, and copy the Base64 result.
• Encode a file: switch to File mode and choose a file — you get its Base64 representation, ready for a data URI or JSON field.
• Decode: switch to Decode mode and paste a Base64 string; if it decodes to a known file type you can download the original file.

Common uses

• Embedding small images or fonts directly in CSS/HTML via data: URIs.
• Putting binary payloads inside JSON, XML, or form fields.
• Encoding credentials for the HTTP Basic Authorization header.
• Storing or transmitting PEM keys and certificates.

Things to keep in mind

Base64 is not encryption — anyone can decode it. It only changes the representation of data, not its confidentiality.

Encoded output is about 33% larger than the input because every 3 bytes become 4 characters.

For URLs and file names use Base64URL, which swaps + and / for - and _ and often drops the = padding.