Base64 Decode

FAQ

Why do I get an invalid padding error?+

Standard Base64 length must be a multiple of 4, using = padding when needed. Truncated strings or missing padding fail validation with a specific message.

Can I paste a data URI?+

Yes. A prefix like data:image/png;base64, is stripped before decoding so you can paste either raw Base64 or a full data URI.

What if the result is not text?+

If decoded bytes are not valid UTF-8, you will see an error suggesting a binary or image workflow such as Base64 to Image.

Why is my decoded text garbled or unreadable?+

The payload may be binary, compressed, or encoded with a legacy charset instead of UTF-8. Image and file Base64 should go through Base64 to Image or a binary-aware workflow, not the text decoder.

Can I decode Base64 without = padding?+

This tool expects standard padded Base64. If padding was stripped, add = characters until the string length is a multiple of four, or paste the value from the source system that included padding.