Base64 Decode — Free Online
Decode Base64 back to text. Works in your browser, no install needed.
Free with a CeevTech Tools account — no credit card required.
How to use Base64 Decode
Paste the encoded string into the Base64 to decode box.
Click Decode.
Read the text or click Copy Result.
Why use CeevTech Base64 Decode?
Found a Base64 string in an email header, config file or API response and want to know what it says? CeevTech Base64 Decode turns standard Base64 back into readable text, decoding the result as UTF-8 so non-English characters display correctly. Paste the string and decode Base64 online in your browser, with a clear message when the input is not valid Base64.
- Fast: processes your code or data in seconds.
- Private: runs in your browser, so nothing is uploaded.
- Works everywhere: desktop, tablet and phone, in any modern browser.
- One account, 79+ tools: PDF, image, office, AI, developer and business tools in one place.
Frequently asked questions
Why do I get "Not valid Base64"?
The input contains characters outside the standard Base64 alphabet or has the wrong length. URL-safe Base64 with - and _ characters is not accepted, so replace them with + and / first.
Can it decode Base64 back into a file?
No. The result is shown as text only. Binary content such as images will not display meaningfully.
Is Base64 Decode free?
Free with a CeevTech Tools account — no credit card required.
Do I need to install anything?
No. Base64 Decode runs online in your browser on Windows, Mac, Linux, Android and iPhone.
Is my data private?
Yes. Base64 Decode runs entirely in your browser, so your data never leaves your device.