Encoding
Base64 Encoder/Decoder
Encode or decode Base64 with UTF-8-safe conversion and clear errors for invalid data. Runs entirely in your browser.
Free to use — no sign-up or login.
Runs entirely in your browser; input is not sent to our servers.
Messages, keys, passwords, plaintext, ciphertext, and files are never stored in
localStorage, history, or analytics payloads.
Result
This free Base64 Encoder/Decoder covers Encode or decode Base64 with UTF-8-safe conversion and clear errors for invalid data. Runs entirely in your browser.
Enter the Base64 Encoder/Decoder fields, then read the output. Encoding calculators on this site keep the formula visible beside the form, with no account required.
Using the Base64 Encoder/Decoder
Encode or decode Base64 with UTF-8-safe conversion and clear errors for invalid data. Runs entirely in your browser. Typical inputs are Mode and Input. How it works beside the form states the identity the Base64 Encoder/Decoder applies.
FAQ
How do I use the Base64 Encoder/Decoder?
Open the Base64 Encoder/Decoder, fill Mode and Input, and read the result. Choose Encode or Decode, paste input, and convert. Invalid Base64 produces an explicit error instead of silent garbage.
What formula does the Base64 Encoder/Decoder use?
The Base64 Encoder/Decoder uses the identity in How it works. In words: Choose Encode or Decode, paste input, and convert. Invalid Base64 produces an explicit error instead of silent garbage.