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Base64 Decoder | Free Online Decoding Tool

Decode Base64 back to original text or files. 100% free, client-side processing with no ads, no tracking, and no cookies.

✓ 100% Ad-Free ✓ Privacy-First ✓ No Signup ✓ Zero Cookies

Examples

Simple Base64 decoding

Input:

SGVsbG8=

Output:

Hello

Decoding a Base64 encoded JSON token

Input:

eyJ1c2VyIjoiYWRtaW4iLCJpZCI6MTIzfQ==

Output:

{"user":"admin","id":123}

When to Use This

  • Inspecting JWT tokens and encoded API responses
  • Recovering original content from Base64 strings
  • Debugging encoded data in web applications
  • Validating Base64 data before processing

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How It Works

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. The Base64 alphabet uses 64 characters: A-Z, a-z, 0-9, +, and / (with = for padding). This encoding is essential for transmitting binary data over text-based protocols like HTTP, JSON, and XML.

When you decode Base64, the Base64 characters are converted back to their original binary representation.

Frequently Asked Questions

What happens if the Base64 input is invalid?
The tool validates your input and shows a clear error message if the data is malformed or contains invalid characters.
Does padding matter when decoding?
The tool handles Base64 strings with or without padding (=). Modern Base64 implementations often omit padding, and this decoder accepts both formats.
Is my data processed locally?
Yes. All decoding happens in your browser. No data is sent to any server. Zero cookies, zero tracking, zero ads.
Can I decode binary files?
Yes. If the Base64 data represents a binary file (like an image or PDF), the decode option will show the raw bytes and offer a download link for the original file.
Do you sell my decoded data?
Absolutely not. There is a common saying in tech: "If you are not paying for the product, you are the product." We built this tool specifically to challenge that standard. Your data never even reaches our servers. We do not track your usage, use cookies, or harvest your data.

Your Privacy is Protected

All Base64 encoding and decoding happens entirely in your browser. Your text and files never leave your device, are never sent to any server, and are never stored. We use zero cookies, zero tracking, and zero ads.