Base64 Encoder & Decoder
Encode or decode strings, binary files, and images to/from Base64 (RFC 4648) — supports standard and URL-safe alphabets.
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What to expect
Built for developers
Supports standard Base64, URL-safe Base64, and binary file encoding including images and PDFs.
Runs client-side. Your data never leaves your browser.
No ads, no trackers, no popups. Pure focus.
Paste code or upload files. Both modes supported.
Share output with teammates via a permanent link.
Adapts to your system preference automatically.
Fully responsive. Works on any screen size.
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About this tool
OpenFormatter's Base64 Encoder & Decoder encodes or decodes strings and binary files per the Base64 Data Encodings specification (RFC 4648). Supports standard Base64 alphabet and URL-safe Base64 (replacing + with - and / with _). Encode text, images, PDFs, and other binary files. Decode Base64 strings back to text or downloadable binary files.