Encode and decode Base64 strings in your browser. No data leaves your device.
🔒 All processing happens in your browser — nothing is sent to any server.
What is Base64 encoding?
A method for converting binary data into text characters (A-Z, a-z, 0-9, +, /) so it can be safely transmitted in text-based systems like email and URLs.
Is my data safe?
Yes. This tool runs entirely in your browser. Your data never leaves your device.
What is URL-Safe Base64?
A variant (RFC 4648) that uses - and _ instead of + and /, and removes padding. Safe for use in URLs and filenames.
What is the maximum input size?
5MB. Since processing is client-side, very large inputs may slow your browser.