Base64 Decode
Decode Base64 text online in your browser without uploading your text to a server.
What this tool does
NexKit Base64 Decode converts Base64 text back into readable text, entirely in your browser, updating live as you type.
How to decode Base64
Paste your Base64 text into the box. The decoded result appears immediately and can be copied with one click.
Accuracy and limits
Invalid Base64 text, or Base64 that decodes to bytes which are not valid UTF-8 text (such as Base64 of a binary file), is rejected with a clear error rather than showing garbled output.
Privacy and file handling
Your text is decoded entirely in your browser. It is not uploaded to NexKit servers by this tool.
Frequently Asked Questions
Is my text uploaded?
No. Your text is decoded locally in your browser. It is not uploaded to NexKit servers by this tool.
What happens with invalid Base64?
You will see a clear error message rather than garbled output. This includes Base64 that decodes to bytes which are not valid UTF-8 text, such as Base64 of a binary file.