Base64 Decode Online – Free Base64 Decoder

Base64 decoder – Free Online Tool

Our free Base64 Decoder converts Base64 strings back into readable text in one click. Paste the encoded value and instantly see what it contains — perfect for debugging APIs, tokens and configuration data.

What is Base64 decoder?

Base64 decoding reverses Base64 encoding. It takes a string made of letters, numbers, + and / characters and converts it back into the original text or bytes.

Developers decode Base64 constantly: to read API responses, inspect authentication headers, examine email source code or understand the payload inside a JSON Web Token (JWT).

How to use the Base64 decoder

1. Paste the Base64 string into the input box.
2. Click the decode button.
3. Read or copy the decoded text.
4. If the result looks garbled, the original data may have been a file or image rather than text.

Key features

• Fast and accurate decoding
• Handles standard Base64 with padding
• One-click copy of the result
• Free, no installation

Common use cases

• Reading Basic Auth credentials in HTTP headers during debugging
• Inspecting the payload of JWT tokens
• Decoding email content and attachments
• Checking encoded values stored in databases or config files

Frequently asked questions

Why does my decoded text look strange?

The data was probably binary, such as an image. Use our Base64 to Image tool for images.

Is it safe to decode Base64?

Decoding simply reveals the original data. Avoid pasting real passwords or private keys into any online tool.

Can I decode URL-safe Base64?

URL-safe Base64 replaces + and / with - and _. Swap them back before decoding if needed.

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• Image to Base64
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• JSON validator & beautifier