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Processed locally — your file never leaves your device

Base64 Decode

Decode Base64 to text entirely in your browser — paste, decode, copy or download.

How it works

  1. Paste Base64 text, or open a file.
  2. Click Decode.
  3. A clear error is shown if the input isn't valid Base64 or doesn't decode to text.

Frequently asked questions

Is my Base64 text sent anywhere?
No. Decoding happens entirely on your device.
What if the text isn't valid Base64?
You'll see a clear error rather than garbled output — the tool checks both the Base64 alphabet and that the decoded bytes are valid UTF-8 text.
Can this decode binary data, like an image?
No — it decodes to text specifically. Base64-encoded binary data (like an image) would fail the UTF-8 text check by design.