Base64 Decoder

Decode Base64 back to readable text, standard or URL-safe.

Base64 to decode0 characters

Paste or type something above and the result appears instantly. Nothing you enter leaves your browser.

What does Base64 Decoder do?

Decode Base64 strings back to text with UTF-8 decoding, accepting both the standard and URL-safe alphabets and tolerating missing padding. Invalid input is diagnosed rather than silently producing gibberish.

How to Use Base64 Decoder

1
Paste the Base64 stringPadding and line breaks are optional.
2
Read the decoded textIt appears immediately.
3
Copy the resultOr switch to hex view for binary data.

Key Features

Handles standard and URL-safe alphabets automatically
Missing padding added automatically
Whitespace and line breaks ignored
Detects binary content and offers a hex view instead of garbled text
Clear diagnosis when the input is not valid Base64

Frequently Asked Questions

Why does my Base64 fail to decode?

Usually truncation, or characters outside the alphabet sneaking in during a copy. Base64 must be a multiple of four characters once padded; the tool pads for you but cannot recover missing data.

Why is the output unreadable?

Because the data was not text. Base64 frequently encodes images, compressed archives or encrypted payloads. Switch to hex view — the first few bytes usually identify the format.

Can I decode a JWT with this?

You can decode each segment individually, but the JWT decoder is easier — it splits the token, decodes header and payload together, and interprets the standard claims.