How to Encode and Decode Base64 Online
Free, step-by-step guide. No signup needed — everything runs in your browser.
1
Open the Base64 Encoder/Decoder
Navigate to the tool. Works instantly with no login.
2
Choose your mode
Click Encode to convert text to Base64, or Decode to convert Base64 back to text.
3
Enter your data
Type or paste your input. The output updates in real-time as you type.
4
Copy the result
Click Copy to copy the output. Use Swap to quickly switch between encode and decode.
Tips for best results
- Base64 encoding increases data size by approximately 33 percent. This is normal.
- The tool handles UTF-8 characters correctly, including emojis and non-Latin scripts.
- Use the Swap button to quickly decode something you just encoded.
- Invalid Base64 strings will show an error when decoding.
Try Base64 Encoder/Decoder now
Encode and decode Base64 strings. Free, no signup, 100% private.
Open Base64 Encoder/Decoder