Base64 Decode Online
Convert a Base64 string back into readable text instantly. Paste below — need to go the other way? Try the Base64 encoder.
How to decode Base64
- Paste your Base64 string into the input field above.
- The decoded text appears automatically on the right.
- Click Copy to copy the result, or Save to download it.
- If you see an error, check the string for missing characters or decode it as URL-safe Base64.
Base64 decoding FAQ
How do I decode a Base64 string?+
Paste your Base64 string into the input box above. The decoded, human-readable text appears instantly on the right.
Why do I get an "Invalid Base64 string" error?+
That error means the input is not valid Base64 — it may contain illegal characters, be truncated, or have incorrect padding. Double-check that you copied the full string. If it uses "-" and "_", decode it with the URL-safe tool instead.
Can this decode URL-safe Base64?+
This page decodes standard Base64. For strings using the URL-safe alphabet ("-" and "_" instead of "+" and "/"), use the dedicated URL-safe Base64 decoder.
Does decoding Base64 reveal the original data exactly?+
Yes. Base64 is a lossless, reversible encoding, so decoding returns the exact original bytes — including UTF-8 text, emoji and non-Latin characters.