Base64 Decoder
Decode any Base64-encoded string back to its original text instantly in your browser. Handles both standard Base64 and URL-safe Base64 (with - and _ characters). Perfect for debugging API responses, reading encoded tokens, and inspecting data URIs.
Frequently Asked Questions
›How do I decode a Base64 string?
Switch to Decode mode, paste the Base64 string, and the decoded text appears instantly. The decoder automatically handles URL-safe variants (replacing - with + and _ with /) and missing padding characters.
›Why does my Base64 string fail to decode?
Common causes: the string might be double-encoded (decode it twice), it might contain line breaks (remove them), or it might not actually be Base64 (check for characters outside A-Z, a-z, 0-9, +, /, =).
›Is my data safe?
Yes. Decoding runs entirely in your browser. No data is sent to any server — everything stays on your device.