Is URL-safe Base64 supported?

Yes. Flip the URL-safe toggle if you need it for query strings or filenames.

Are files uploaded to a server?

No. Files are read and encoded right in your browser.

Text

File

Encode

Decode

URL-safe

URL-safe Base64

Standard Base64 uses +, /, and =, all of which need percent-encoding inside URLs.

URL-safe Base64 (RFC 4648 §5) swaps:

Used by JWTs, OAuth tokens, and anywhere Base64 ends up in a URL or filename.

Input

Output

Files up to 25 MB. Nothing leaves your browser.

Base64

The URL below carries the direction, URL-safe flag, and your input. File mode does not share.

Input is too long to include in the URL.

Share URL

Anyone with this link can read the values it contains. Do not use it for sensitive data.

Is URL-safe Base64 supported?: Yes. Flip the URL-safe toggle if you need it for query strings or filenames.
Are files uploaded to a server?: No. Files are read and encoded right in your browser.