How to Decode Base64 Safely: Text, Images, Files, and Common Errors

Base64 decoding looks simple. You take a string like this: SGVsbG8gV29ybGQ= Decode it, and get: Hello World But in real projects, Base64 decoding can fail for many reasons: missing padding invalid characters Unicode problems Base64URL format binary data being treated as text image data missing a MIME type whitespace copied into the string This guide explains how to decode Base64 safely in JavaScript, Python, and the command line, and how to troubleshoot the most common Base64 decoding issues. Yo