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Tools / Developer / Base64 Decode

Developer tool

Base64 Decode

Decode Base64 strings back to plain text instantly.

Step 1

Paste input

Add your content in the input editor.

Step 2

Run tool

Process instantly with in-browser logic.

Step 3

Copy output

Export clean results to your project.

All-time runs

Live traffic

30-day success

Reliable processing

Average speed

Fast avg

⚡ Runs instantly in your browser. No files are uploaded.

Input

Output

Ready.

Learn more

Learn more about this topic:

Base64 Encoding Explained (With Examples)

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About Base64 Decode

This decoder accepts standard and URL-safe Base64, validates its alphabet and padding, and converts the decoded bytes to UTF-8 text locally in the browser. Whitespace and omitted URL-safe padding are accepted. Binary data that is not valid UTF-8 is rejected instead of being displayed as corrupted replacement characters.

Runs locally in your browser. The text you enter is not uploaded to CodeStorms.

→ Decode the payload section of a JWT token to inspect its claims without a dedicated library. → Inspect a Base64-encoded text field from an API response. → Decode URL-safe Base64 text used in tokens and web payloads. → Validate that an encoded value contains readable UTF-8 rather than binary data.

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📦 Supported formats 1 file types

Base64 text

❓ Frequently asked questions 3 answers

This tool decodes Base64 that represents valid UTF-8 text. Binary files are detected and rejected.

You'll see an error message indicating the string contains invalid characters or padding.

Yes, both standard Base64 and URL-safe Base64 (using - and _ instead of + and /) are supported.