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Base64 Decoder Converter Runs in your browser. No input data is sent to our server.

Paste Base64 into the editor, decode it instantly, and copy the plain-text result. This page is useful for APIs, tokens, encoded payloads, and quick debugging work.

Decoded text

Paste content and convert it instantly.

This converter runs in your browser so you can reshape structured text, config data, and encoded values without sending working content to a remote processing service.

Decode Base64 Online

Decode Base64 online to read encoded payloads, inspect API responses, and debug token values in your browser. Paste a Base64 string and the tool decodes it back to plain text — useful for reading JWT payloads, checking encoded config values, and inspecting Base64-wrapped data from APIs or log files.

How to use Base64 Decoder Converter

1

Paste content into the base64 input panel.

2

Run the converter to generate the target format instantly.

3

Copy the result once it looks right.

What this tool helps you do

Paste, convert, and copy results quickly

Useful for APIs, configuration files, and structured text

Sample input is built in for quick testing

Copy the converted output as plain text

Why this helps in text and data workflows

Reading the payload of a JWT token after decoding the middle segment.

Decoding a Base64-encoded config value or secret that was stored in an environment variable.

Inspecting a Base64-encoded API response body or error message.

Verifying what's inside a Base64 string from a third-party system before using it.

Common problems and fixes

The decoder returns an error for what looks like valid Base64.

Check if the string is Base64URL-encoded (uses - and _ instead of + and /). Use the Base64URL Decoder if the characters include dashes or underscores.

The decoded output is garbled characters.

The input may be encoding binary data rather than UTF-8 text. Binary Base64 will always appear as unreadable characters when decoded to a text string.

The Base64 string is missing its padding (= signs).

Some encoders omit the trailing padding. Try adding = or == to the end before decoding, or use the Base64URL Decoder which handles unpadded input.

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Related Guides

What Is Base64 Encoding Used For? When to Use Base64URL Instead of Base64 What Is Base64URL and When Is It Used?

Frequently asked questions

How do I decode Base64?

Paste your Base64 input into the box, run the decoder, and copy the decoded text.

Will this Base64 decoder validate the input?

Yes. Invalid Base64 returns an error instead of partial decoded output.

How do I decode a JWT payload?

A JWT has three dot-separated parts. Take the middle part (the payload segment), paste it here, and decode. It's Base64URL-encoded, so use the Base64URL Decoder if you get errors.

What's the difference between Base64 and Base64URL?

Base64URL uses - and _ instead of + and / and omits padding. JWT headers and payloads use Base64URL. If pasting JWT content here gives errors, switch to the Base64URL Decoder.

Can I decode Base64 images with this tool?

This tool outputs text. A Base64-encoded image will decode to raw binary characters, which won't be readable as text. For image data, you need a tool that handles binary output.

Is this Base64 decoder free?

Yes. It is free to use in your browser.