Utilities · Encode & Decode

Base64 encoder and decoder for Mac

Encode or decode Base64, URL encoding, HTML entities and hex.

Runs on your Mac

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Three steps. That's it.

1
Type or paste
Enter the text, link or details you want to use.
2
Choose the options
Set what you need in the options panel, such as format. Your choices are remembered for next time.
3
Get the result
The result appears below your original and is copied to the clipboard. Binary data is saved as a file.

What Encode & Decode does

Convert text to and from Base64 (including URL-safe Base64 and data: URLs), URL percent-encoding, HTML entities and hex. Decoded data that isn't text, such as a Base64 image, is saved as a file with the right extension. Everything happens on your Mac, so tokens and private data never touch a website.

Options

Format: Base64, URL, HTML entities or hexDirection: encode or decode

Great for

Decode a Base64 string from an email header or API
Turn a data: URL back into an image file
Encode a query string safely for a link

Questions about Encode & Decode

Does Encode & Decode upload my files?

No. Encode & Decode runs entirely on your Mac, so your files never leave it and it works offline.

Will Encode & Decode change my original files?

No. Results are saved as new files in a dated folder in Downloads › OneMacTools, and your originals are left exactly as they were unless you turn on an option that says otherwise.

What does Encode & Decode need?

Just a Mac with macOS 26 or later. There's nothing else to install.