Base64 Encoder

Turn text into Base64 and back again, or encode a whole file. Handles every language and emoji correctly, and offers the URL-safe alphabet when you need it. Nothing you enter leaves this page.

Settings

Mode

Text input

URL-safe alphabet (encode only)

Or encode a file

The file is read on your device; only its Base64 text is shown.

Output

How it works

Base64 rewrites binary data using only 64 safe text characters, so it can travel through systems that only accept text — email bodies, JSON fields, data URLs. Your text is first converted to UTF-8 bytes (which is why emoji and non-Latin scripts survive the round trip), then those bytes are regrouped into the Base64 alphabet by this page's own codec.

The URL-safe variant swaps + and / for - and _ and drops the = padding, so the output can sit inside a URL or filename without extra escaping. Decoding accepts both alphabets and ignores whitespace, so wrapped or pasted output still decodes.

Say it plainly: Base64 is not encryption. Anyone holding the output can decode it in one line — no key involved. Use it for transport, never for secrecy.

Limitation: encoding inflates data by about a third, so a 3 MB file becomes roughly 4 MB of text. Decoding only produces readable text when the original bytes were text; decoding the Base64 of an image, for instance, gives bytes this page can't display.