SOSECIO
Local processing active

Base64 encoder and decoder

Convert text or files to Base64, or decode them back.

File and Data URL
Drop a small file here or choose one locally. The file is encoded directly into the output in this browser; it is not uploaded, stored, or written into the input box.
Output
Usage and limits

Input limit is 256 KiB. Strict mode rejects whitespace, invalid characters, and incomplete padding; lenient mode only normalizes locally.

Recommended from common tool workflows. This section does not read or pass page input.

URL encoder and decoderPercent-encode or decode URL parameters, full URLs, and form values locally for batch debugging and report snippets.