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Base64 Decode

Decodes standard Base64 bytes as strict UTF-8 text.

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How Base64 Decode works

Decodes standard Base64 bytes as strict UTF-8 text.

Try an example

SGVsbG8= → Hello.

Good to know

Binary non-UTF-8 data is rejected; this tool returns text only. Input stays in this tab and is never sent to analytics. Limit 100,000 characters. No input is executed.

Your privacy

Processing happens on this device for this tool. We do not upload your input, put it in share links or save it to your favourites. Closing this tab discards the working input; downloaded results remain wherever you save them.

When this tool is useful

Use Base64 Decode when you need a quick, local result and want the rule or limitation visible alongside it.

How to use it

  1. Enter the input using the labels shown.
  2. Run the operation and review the result.
  3. Download or copy the result only after checking it.

Checks before you rely on the result

  • Binary non-UTF-8 data is rejected; this tool returns text only. Input stays in this tab and is never sent to analytics. Limit 100,000 characters. No input is executed.
  • Keep the original input when the operation creates a new copy.
  • Use the related tools below when the next step needs a different format.

This page is maintained with the tool implementation and its deterministic tests. If the result looks wrong, report the issue with a non-sensitive example.

Read the Base64 Decode instructions

A useful next step

JSON Validator
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