Base64 Decoder
Paste a Base64 string and decode it back to plain text instantly, right in your browser. No signup.
Open the Free Tool →When you receive a Base64 string from an API, token or header, you often need to read what it contains. This decoder converts Base64 back to plain text instantly, so you can inspect the original content.
Everything runs in your browser, so the string is processed locally. It is free with no signup, useful for debugging API responses and tokens.
Why use it
Instant decoding
Turn a Base64 string back into readable text right away.
Debug tokens
Paste a JWT to see its header and payload as formatted JSON, with issue and expiry times. The signature is not verified.
Runs locally
Decoding happens in your browser, not on a server.
Free, no signup
Use it instantly without an account.
FAQ
How do I decode a Base64 string?
Paste the Base64 string on the input screen and the tool decodes it back to plain text instantly.
Can it decode any Base64?
It decodes standard and URL-safe Base64 (padding optional), data: URIs and JWTs. If the result is not text, you can download it as a file.
Is the string sent to a server?
No, decoding happens locally in your browser.
Why would I decode Base64?
It is useful for inspecting API responses, tokens and headers that arrive encoded.
Can I encode text as well?
Yes, the same tool also encodes plain text to Base64.
Looking for the full tool? Open Base64 Encoder / Decoder — free and no account needed.
The All Innovativ Base64 Decoder turns a pasted Base64 string back into plain text instantly, right in your browser — free, 100% browser-based, with no upload, no account and no signup.
You paste the Base64 string on the input screen and the tool decodes standard or URL-safe Base64, data: URIs and JWTs instantly. Decoding happens locally in the browser, so the string is never sent to a server and there is zero server-side retention. It is handy for inspecting API responses, tokens and headers that arrive encoded, and the same tool also encodes plain text to Base64. It is free with no signup required.