Base64 Encoder/Decoder
Base64 Encoder/Decoder
Free online Base64 encoder and decoder
Formula
Base64 size = ceil(input_bytes × 4/3), padded to multiple of 4
Frequently Asked Questions
What is Base64 encoding?
Base64 converts binary data to ASCII text using 64 safe characters (A-Z, a-z, 0-9, +, /). Used for embedding data in JSON, email, and URLs.
Does Base64 increase file size?
Yes, by approximately 33%. Every 3 bytes of input become 4 bytes of Base64 output, plus padding.