For teachers
Audit a submission for hidden text
Paste a student's submitted work and reveal the invisible characters, white-text, and hidden content that don't show up on screen — so you can see exactly what's really there.
🔒 100% private — in-browser
🔍 reveals — position + type
✅ free — no sign-up
Ready to audit
Paste the submission on the left, then hit Audit. We'll reveal any hidden characters and text with exact positions.
What it reveals
- Invisible characters — zero-width spaces, joiners, BOMs, soft hyphens — with their exact position and Unicode code point.
- Hidden text — white-on-white, zero-opacity, off-screen and other hidden-HTML signals.
- Prompt-injection patterns — instructions hidden inside pasted content.
Why audit?
Invisible characters don't show on screen, but they occupy bytes and can carry hidden markers or hidden instructions. Auditing a submission shows you what's actually there — transparently and deterministically.
This tool reveals hidden content for verification. It does not attempt to detect AI authorship — that's unreliable. For students who want to clean their own work before submitting, use the file cleaner.