GUIDE
Base64 explained
Represent bytes as text without encrypting them.
On this page
Understand the conversion
Base64 maps groups of bytes to a text alphabet. Padding may appear at the end. Anyone who has the encoded value can decode it; it is not a way to hide a password.
Hello → SGVsbG8=Keep the alphabet straight
Standard Base64 uses + and /. Base64url uses - and _ instead. Check which format a consuming system expects. Quietkit’s Base64 tools are for UTF-8 text, not a general binary attachment viewer.
Check text and file size
Encoding usually increases size. UTF-8 characters can occupy multiple bytes, so character count is not the file size. Use Open file for text and Download to keep a larger result. The page shows its current input and output limits.