Disclaimer

Last updated: October 2026

Base64Deco is a Base64 encoder and decoder: it converts text to and from Base64 with full UTF-8 support for Chinese characters and emoji, and auto-detects which direction you want. In practice, it encodes the bytes of the string in UTF-8 first and then groups them into 6-bit chunks for the Base64 alphabet, which is why non-ASCII text survives intact instead of becoming mojibake. This page should be read with that tool in mind, because the limits described apply to what it computes.

Practically, all the calculation needs is the text or Base64 string you paste. Typical reasons people open Base64Deco include checking what a Base64 blob actually contains, and in every case the work happens on the visitor's own device rather than ours.

General information only

base64deco.com is an informational site. What Base64Deco produces are estimates of a calculation, not measured facts and not professional guidance.

Using developer output

Output from tools aimed at developers is meant to be inspected. Check whatever Base64Deco produces against what your project actually needs before depending on it.

Advertising and independence

Adverts pay for the Site and nothing more. They cannot influence a result, and an ad appearing here is not a recommendation.

No warranty of any kind

For Base64Deco, the assumption that matters is that your input sits inside the range the tool is built for. It encodes the bytes of the string in UTF-8 first and then groups them into 6-bit chunks for the Base64 alphabet, which is why non-ASCII text survives intact instead of becoming mojibake. Beyond that range — and wherever rounding, unit handling or browser rendering intrudes — the Site carries no warranty at all.

Links to other sites

A link to an outside page is there for reference. That content is not under our control and we are not responsible for its accuracy.

Checking a result yourself

Make sure any result suits your own situation before you act on it. If you think something is wrong, the contact page is the quickest way to let us know.