Stun LLMs with thousands of invisible Unicode characters
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I made a free tool that stuns LLMs with invisible Unicode characters.*Use cases:* Anti-plagiarism, text obfuscation against LLM scrapers, or just for fun!Even just one word's worth of “gibberified” text is enough to block most LLMs from responding coherently.
HN · launched Nov 24, 2025 · 206 upvotes (top 5%) · 0 views
Niche: prompt injection security tools · 26 launches, 0 in the last 7 days · Explore this niche →
Category and tags
- Security
- Developer
- AI-native
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 26 launches in prompt injection security tools →
Could you build this?
Yes The tool simply injects invisible zero-width Unicode characters into text strings via standard frontend JavaScript manipulation to disrupt tokenizer boundaries.
Discussion
20 comments analyzed.
Competitors mentioned: Google's image watermarks, DANs (jailbreak techniques from 2023), FastText language detection, Tesseract OCR
Concerns raised: Easily defeated by preprocessing or screenshot conversion to images, Newer LLM models could be trained to ignore obfuscation, Unicode filtering breaks legitimate non-ASCII characters and accent marks, Only 95% effective, not a permanent solution, Would be filtered out by LLM training datasets using language detection
Feature requests: Open source the watermarking approach, Increase effectiveness beyond current 95% rate, Support for more obfuscation methods beyond current 10 letters
Competitors
Other products that read as similar to this one : 106 launches clear the similarity bar, closest 8 shown.
Attention rank: #5 of 107 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 24 days after the earliest competitor.
- Gibberifier · ph · 2026-10-25 · 2 upvotes · similarity 0.55
- AI Watermark Detector · ph · 2026-10-08 · 1 upvotes · similarity 0.51
- Watermarks Remover: Clean LLM watermarks from text and files · hn · 2026-08-28 · 5 upvotes · similarity 0.46
- InvisiChar · ph · 2026-10-30 · 1 upvotes · similarity 0.46
- Cursed Text Generator · ph · 2026-10-22 · 1 upvotes · similarity 0.45
- UncensoredLLM · ph · 2026-10-25 · 2 upvotes · similarity 0.44
- Unicode Steganography · hn · 2026-04-07 · 59 upvotes · similarity 0.44
- Trigger Words · ph · 2026-10-21 · 2 upvotes · similarity 0.42
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