Mask sensitive text and log data

Enter a JavaScript regular expression without surrounding / characters, up to 300 characters. All occurrences are replaced without case sensitivity, using Unicode matching. Exact phrases are searched as written, not interpreted as regular expressions: at most 100 different phrases, 4000 characters total.

Processing takes place in this browser. Enter up to 100000 characters or open a UTF-8 file up to 400 kB. A background task performs the search and is stopped if it exceeds the time limit.

Pattern matching is not guaranteed anonymisation. Names, addresses and unusual secrets can be missed. Counts refer to sequential replacements; broad rules may also mask ordinary data.