Line Wrapping
Output is wrapped at 76 chars per line (MIME standard).
URL-Safe Mode
Replaces + with - and / with _, making the output safe for URLs and filenames.
Padding Control
The = padding characters ensure correct decoding. Remove them for compact URLs.
Auto-Clean Input
Automatically strips whitespace, newlines & invalid characters before decoding. Enabled by default.
Smart Detection
Detects JSON, HTML, URLs and binary content in the decoded output and highlights accordingly.
Charset
Choose the character encoding for decoding. UTF-8 works for most modern content.
File → Base64
Encode any file to a Base64 data URI string
Drop any file or browse
Images, PDFs, text, binary — any file type
Base64 → File
Decode a Base64 data URI and download as a file











