File to Base64 Converter

When checked (the default), the output starts with data:mime/type;base64, followed by the encoded bytes, producing a string you can paste straight into an image src attribute or a CSS url(). Uncheck it to get the bare Base64 payload for JSON APIs, email systems, or databases that expect raw encoded text.

Any file: images, PDFs, fonts, archives, documents, or binaries with no extension at all. The tool reports the file name, detected MIME type, and size after selection, and image files additionally render a live preview so you can confirm the encoding visually.

Base64 stores every 3 bytes of binary data as 4 text characters, an overhead of roughly 33 percent, and line wrapping adds newline characters on top. The output size shown under the textarea reflects the true encoded size, so use it when checking length limits in the destination system.

Wrapping matches the MIME standard used by email attachments and PEM-style files. Keep it off for web work, since data URLs and JSON fields expect one unbroken string, and turn it on only when the receiving system requires line-limited Base64.

No. The browser FileReader API reads the file directly from your disk into memory, and the Base64 string is generated on your device. No file content ever travels to a server.