Free tool
Base64 Encoder / Decoder
Encode or decode Base64 for text or files — nothing leaves your browser.
Base64 turns arbitrary binary data into plain ASCII text, which is why it shows up everywhere text-only formats need to carry binary content — embedding images in CSS or HTML, encoding attachments in email, or passing binary data through APIs and config files that only accept text.
This tool encodes and decodes entirely client-side, for both plain text and files.
How to use it
- 01Choose Encode or Decode, and File or Text.
- 02Paste text or drop a file.
- 03Copy the result, or download it if you decoded a file.
Frequently asked questions
Does Base64 encoding encrypt or compress my data?
No — it's neither encryption nor compression. Base64 is a reversible encoding: anyone can decode it back to the original instantly. It also makes data about 33% larger, not smaller. If you need actual privacy, use the file encryption tool instead.
Why did decoding fail?
The input isn't valid Base64 — it may contain characters outside the Base64 alphabet, or be missing padding. Make sure you copied the entire string with nothing added or cut off.
Is there a file size limit?
No hard limit, but Base64-encoding a large file produces a much larger text string (roughly 4/3 the original size) held in memory, which can get slow for very large files.
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