Encode File to Base32

Encode a file to Base32 online

This tool reads a local file or accessible URL as raw bytes and converts the complete content to RFC 4648 Base32 text. Local files are processed in the browser rather than being uploaded to an application server.

Base32 can place binary data into systems that accept a restricted text alphabet, but it increases size and provides no encryption or authenticity.

How to convert a file to Base32

1. Select Local File or URL as the source.
2. Choose a local file, or enter a URL that allows browser access.
3. Click Encode and wait for the entire input to be processed.
4. Copy the Base32 output or download the encoded text file.

URL processing depends on the remote server’s availability and cross-origin access policy. A URL that opens in a browser tab may still block programmatic reading from another site.

File bytes and Base32 size

The filename and MIME type are not stored in ordinary Base32 output; only the file bytes are encoded. Record the original filename and format separately when the recipient needs them.

RFC 4648 Base32 represents five input bytes with eight output characters before padding. The encoded text is therefore larger than the source file and can consume substantial memory for large inputs.

File to Base32 FAQ

Does changing a file extension change its Base32 value?

No, provided the underlying bytes remain identical. The extension is not included in the encoded content.

Is the encoded file compressed?

No. Base32 expands binary data into printable text. Compress the source separately when compression is required.

How do I restore the file?

Use Decode Base32 to File, enter a suitable filename, and keep the exact Base32 value. For short text, use the Base32 Encode tool.