A free, fully in-browser tool to find and clean invisible text tricks: 🔍 Detect hidden Unicode — zero-width spaces, BOM markers, and other invisible characters that often hide in AI-generated and copy-pasted text. ↔️ Catch Trojan Source — bidirectional control characters that make code look one way and run another. 🧹 One-click clean — strip hidden characters, keep your real text. 📂 Scan pasted text or uploaded files, all on your device. 🛡️ No upload. No tracking. Nothing leaves your browser.

I built this because most "watermark checker" tools ask you to paste your text into someone else's server — fine for a public tweet, risky for a contract draft or source code. Two things pushed me to make a local-only version: 1. AI-generated and copy-pasted text often carries invisible Unicode characters — zero-width spaces, BOM markers, weird whitespace — that you can't see but that travel with your text and break things downstream. 2. Trojan Source (disclosed by Cambridge researchers in 2021) uses bidirectional Unicode overrides to hide malicious code in plain sight — a real supply-chain risk for anyone reviewing code. So this runs 100% in the browser. Paste or drop a file, see exactly what's hidden, clean it in one click. Nothing is uploaded. Feedback welcome — especially edge cases I haven't caught yet.

AI Watermark Detector

Find & remove hidden Unicode — 100% in-browser, no upload

Find & remove hidden Unicode — 100% in-browser, no upload