AI Watermark Detector

AI Watermark Detector is an AI text-cleaning tool that scans copied or pasted text for hidden Unicode characters and flags them for removal, aimed at publishers, developers, and data engineers. It checks four signal types: invisible characters, bidirectional (BiDi) control overrides that can hide malicious logic in source code, mixed-script lookalike letters, and Unicode normalization gaps. The scan runs entirely in your browser with no upload to a server and no account, so pasted text and files never leave the page, and it keeps working offline after the first load. Reports are severity-flagged and show the exact character positions, and you can remove flagged characters selectively or in a batch with a before-and-after comparison. It accepts a range of file types including .txt, .md, .csv, .json, .html, .css, .js, .java, and .py, which makes it practical for cleaning CMS content, scrubbing byte-order marks and non-breaking spaces out of CSV and JSON imports, or reviewing code for BiDi tricks. One honest limit worth knowing for BestAIFor readers: it detects character-based marks only, not statistical watermarks such as Google's SynthID, which need vendor keys to identify. For teams who just need to know whether text carries hidden formatting before it ships, it is a focused, private option.

Finding and removing hidden Unicode characters, BiDi overrides, and mixed-script letters in text, code, and data files