Base64 Encoder
Encode text or files to Base64, or decode Base64 back to its original form.
Runs entirely in your browser — files never uploaded
How to use Base64 Encoder
- 1. Pick a mode. Encode (anything → Base64) or Decode (Base64 → original).
- 2. Choose your source. Text input for snippets, file upload for binary data up to 10 MB.
- 3. Convert. Encoded or decoded output appears instantly. Copy, download, or hit Swap to round-trip.
FAQ
What is Base64?
Base64 is a way of representing binary data using only 64 printable characters (A-Z, a-z, 0-9, +, /). It's commonly used to embed images in HTML/CSS, send binary files over email, or include data in JSON.
Does this support emoji and accented characters?
Yes. We use UTF-8 encoding before Base64-ing, so emoji (🎉), accents (café), and any Unicode character round-trip cleanly.
Does this support URL-safe Base64?
On decode, yes — we automatically map - to + and _ to / so URL-safe Base64 strings work without modification.
Are my inputs uploaded?
No. All encoding and decoding happens entirely in your browser. Nothing is sent to any server.
Why is the encoded output bigger than my file?
Base64 always grows the data by ~33% — that's the cost of representing binary as text. There's no way to avoid it; it's how the format works.