Base64 Converter
Use Base64 Converter, review the result, and keep the original until the output is checked.
Input Text
Output
How to use Base64 Converter
- Paste a string, or use Upload File to load one from disk - the page decides the direction itself.
- Read the Analysis card: Input Type tells you whether it recognised plain text or Base64, and Detected MIME and File Signature name what the bytes actually are.
- Set Character Set to UTF-8 (Unicode) for accented or non-latin text, and tick URL Safe Encoding when the string travels in a query parameter.
- Add Data URI Prefix for inline HTML or CSS, Break Lines (76 chars) for PEM-style formats, then Copy or Download.
What Base64 Converter actually does to your file
This is the automatic page: text goes out as Base64 and valid Base64 comes back as text, with no mode switch to set, so a string that only looks like Base64 (right alphabet, length not a multiple of four) is treated as plain text and encoded again. Base64 is an encoding, not compression - the text is about a third longer than the bytes it represents, which is exactly why it can travel inside JSON, CSS and email.
Base64 Converter FAQ
What does Base64 Converter do?
Convert Base64 strings online in a click. Our free tool delivers fast, secure Base64 encoding & decoding
Which files work with Base64 Converter?
This category commonly supports text, images, and binary files. Use the accepted file types shown in the uploader, because support varies by browser and by the engine behind each tool.
Is Base64 a way to protect data?
No. Base64 is reversible by anyone who has the text and adds about a third to the size. Treat it as an encoding, not as encryption or compression.
Will my original file be changed?
No. You paste text or open a file to read it, the result appears in the other pane, and only what you copy or download leaves the page.
How is my file processed?
It is not uploaded. The processing is done locally by the encoder bundled with this page, so the practical ceiling is your device's memory and the limit shown beside the uploader - no queue, no account, no copy on a server.
Is the Base64 Converter free?
Yes. The Base64 Converter is free with no trial limit, subscription, or watermark on downloads. You can use it for personal and commercial projects without creating an account.