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Base64 Decode

Decode standard Base64 or Base64URL into UTF-8 text and report invalid input.

Workspace⌁ Processed on your device

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Processed on your device

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How it works

Decode standard Base64 or Base64URL into UTF-8 text and report invalid input. Enter your values or try the example. Run the action, check the result and copy or download it. Your input remains editable after an error.

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Example

Y2Fmw6kg8J+Riw== → café 👋
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When to use this tool

Inspect encoded text from a log or configuration without sending it to a service.

Supported formats & limits

Up to 5 MiB of text. Base64 is an encoding, not encryption. Decoding accepts standard and URL-safe alphabets, but the decoded bytes must be valid UTF-8.

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Good to know

What happens when I change the input?

An edited input needs a new result. Run the action again; previous download links are removed so you cannot mistake an old output for the current one.

Are my files uploaded?

Your files and pasted content are processed in temporary browser memory and are not uploaded for processing. App preferences store only tool IDs, language and theme. There are no accounts, ads or automatic error reports. Closing the page discards your workspace; download results you want to keep. Production pages use Google Analytics for visit statistics; see the Privacy page for details.