Is this Base64 converter private?

Yes. All encoding and decoding happens in your browser. No input is uploaded to a server.

What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _, and can omit padding characters so the output is safe in URLs and tokens.

Yes. You can convert small files to Base64 and convert Base64 back into a downloadable file directly in your browser.

Convert text and small files to Base64, decode Base64 back to text, and generate downloadable files — all client-side in your browser.

URL-safe Base64 mode

Replaces +// with -/_ and removes padding while encoding.

Input Text

Base64 / Decoded Output

File to Base64

Best for small files. Large files may be slow in-browser.

Base64 to Downloadable File

File Base64 Output

Is this tool secure for sensitive text?

Everything runs locally in your browser. No server upload is required for conversion.

Why do I get an invalid Base64 error?

The input may contain unsupported characters, incorrect padding, or partial/corrupted Base64 data.

Does URL-safe mode change decoded content?

No. It only changes how Base64 is represented for safe transport in URLs and tokens.