Base64 Decoder
Read Base64-encoded text with strict checks for malformed data.
How to use it
- Paste your input, or load the example.
- Choose the options that match your task.
- Select Decode Base64, then review the result.
- Copy the result or download base64-decoder.txt.
Readable text only
Select the matching standard or URL-safe alphabet. Spaces, tabs and line breaks around encoded data are ignored. Valid unpadded input is accepted, but incorrect padding and nonzero padding bits are rejected. The decoded bytes must be valid UTF-8. Binary image, archive and document data cannot be decoded into text here. An empty input produces an empty result.