Is Base64 encryption?

No. Base64 is encoding, not encryption. Anyone who has the Base64 string can decode it without a key, so never use Base64 to protect passwords, tokens or secrets.

Does this tool upload my text or file?

No. Text and files are processed locally in your browser tab. Nothing is uploaded, saved on a server, or shared by this tool.

What is URL-safe Base64?

URL-safe Base64 replaces + with - and / with _, and usually drops the trailing = padding. It carries the same data in an alphabet that is safer inside URLs and filenames.

Why did my Base64 fail to decode?

Usually a character is missing, extra or changed, padding is in the wrong place, or the decoded bytes are binary data rather than UTF-8 text. This tool explains the specific problem instead of silently showing garbled output.

Can I encode a file to Base64 here?

Yes, for small files under 2 MB. Base64 output is about one-third larger than the original file, and very large files can slow or freeze a browser tab, so this feature is deliberately limited.

Base64 онлайн — кодировать и декодировать