How to use Base64 encode and decode
- Choose Text or File.
- Paste text or choose a file.
- Press Encode or Decode and copy the result.
Questions
Is Base64 encryption?
No. It's an encoding anyone can reverse. Never use it to hide passwords or secrets.
Why is Base64 bigger than the original?
It uses 4 characters for every 3 bytes, so it's about 33% larger.
What is URL-safe Base64?
A variant that uses - and _ instead of + and / and drops the = padding, so it can sit in URLs and filenames.
Is my data uploaded to a server?
No. The tool runs in your browser and works on your data directly on your device. Nothing is sent to us or anyone else, which is why it also keeps working if your connection drops after the page loads.
Last updated 13 November 2026.