Is my data uploaded anywhere?

No. All processing happens locally in your browser with no server round-trip.

Does this tool work offline?

Yes. Once the page loads, the tool runs entirely client-side and needs no network connection.

TOOL

UTF-8 Sanitize (Lone Surrogates)

Sanitizes text to valid UTF-8: lone surrogates are replaced with U+FFFD; any other input is returned unchanged. This is not a general encoding converter — GBK/Shift-JIS/Big5 and other encodings are not decoded.

Input

Try an example:

Output

Local only

Recent history

No history yet

How to use

Type or paste your input into the input box.
Adjust any parameters if needed.
Copy or download the result.

Frequently asked questions

Is my data uploaded anywhere?: No. All processing happens locally in your browser with no server round-trip.
Does this tool work offline?: Yes. Once the page loads, the tool runs entirely client-side and needs no network connection.