Encode text or files as Base64 online.
Enter text or open a file. Convert UTF-8 text and binary files to standard Base64 or Base64URL without uploading them.
AbsolTools makes commonly used online tools more accurate and easier to use. Bookmark this site for easy access.
Drop a text or binary file anywhere in the converter.
Your input and results are processed only in this browser. They are not uploaded to or stored on a server.
How to encode Base64
Base64 turns text or binary bytes into printable characters. It does not encrypt or protect the source data.
- Type text or open the file you want to encode.
- Choose standard Base64 or the URL-safe alphabet, then adjust padding or line wrapping only when the destination requires it.
- Copy the Base64 result or download it as a text file.
Your input is not stored.
The site does not store your input or conversion results, and it does not send them to a server. Everything is processed in your current browser session and disappears when you reload or close the page.
Standards and input handling
By default, the tool follows RFC 4648 and handles standard and URL-safe alphabets, optional padding, MIME whitespace, and Data URI prefixes. Turn on strict validation when the exact format matters.
Frequently asked questions
Is Base64 encryption?
No. Base64 changes binary data into printable text. It provides no secrecy or authentication.
Should I use standard Base64 or Base64URL?
Use standard Base64 for general files and data. Use Base64URL when the value must appear safely in a URL or filename.
Does this site upload my input?
No. Conversion happens in your browser. Your input, files, and results are not uploaded to a server.