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Encode text or files to Base64, or decode Base64 back to text - multi-byte safe, fully client-side.
Every tool runs entirely in your browser. Nothing you type is uploaded, stored, or logged on our servers.
The Base64 Encoder & Decoder converts text to and from Base64 in real time. It handles multi-byte characters (emoji, CJK, accented letters) correctly, and no data ever leaves your device.
Commonly used for embedding images in HTML/CSS, encoding JWT payloads, or passing binary data through text-based APIs.
Switch to File → Data URL mode to upload any file (image, PDF, audio…) and get a ready-to-use data:image/png;base64,… string you can embed directly in HTML or CSS. Use the Swap button to instantly flip input and output when chaining encode → decode operations.
Base64 turns binary or text data into ASCII characters so it can be transmitted safely in text-only channels like JSON, HTML, or email.
No. Base64 is encoding, not encryption. Anyone can decode it back to the original value without a secret key.
Base64 increases size by about 33 percent because every 3 bytes of source data are represented by 4 encoded characters.
Yes. Use file mode to convert files into Base64 data URLs that can be embedded directly in HTML or CSS when needed.
No. Encoding and decoding run in your browser, so your content stays on your device.