Developer tool

Base64 Decoder

Decode Base64 into readable UTF-8 text in the browser, with invalid-data feedback.

Free browser tool

No Matrix computer needed

✓ No account or card

✓ Use the result right away

✓ Task-specific limits below

Workspace

Use base64 decoder

Runs in this browser tab

Your input24 / 100,000

Result

Your result will appear here. The input stays in this browser tab.

How to use it

Paste a Base64 value to see its decoded UTF-8 text before using it.

Try this example

SGVsbG8sIE1hdHJpeCBPUyE=

What to check

Binary data that is not valid UTF-8 cannot be displayed as text here.

Review the result before using it in a published page, application, or agent configuration.

Quick answers

Frequently asked questions

Why can a Base64 value fail to decode as text?

The decoded bytes must be valid UTF-8. Binary files and malformed Base64 are rejected because this tool displays text rather than arbitrary bytes.

Does Base64 decoding check whether content is safe?

No. It reveals the encoded text but does not establish trust. Treat decoded scripts, links, and credentials as untrusted content.

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