🔍 Browser-Based
🚫 No Server
📁 File Upload
Free Online Invisible Character Remover &
AI Watermark Cleaner 2026
Detect & remove zero-width spaces, Unicode steganography, AI watermarks & hidden characters from text or uploaded files — 100% private, no API key needed.
The most complete free invisible character remover online — detect and strip zero-width spaces, AI watermarks, Unicode steganography, and hidden control characters from any text or file. Our hidden character detector supports 7 cleaning modes, file upload, Hex view, Frequency analysis, and Diff comparison — 100% browser-based, no server, no API key.
Drop a file here or click to browse
File is read locally — nothing leaves your device. Or paste text below.
TXTMDHTML
CSVJSONXML
RTFJS/CSSLOG
SQLPY/PHPSRT/VTT
Cleaning Mode
🛡️ SafeZero-width + AI tags
🧠 Smart+ Control + BOM
⚡ Aggressive+ Homoglyphs
⚙️ CustomChoose manually
Cleaned
Visualize
Diff
Hex
Frequency
Stats
Run cleaner to visualize hidden characters as red markers…
Run cleaner to see exactly what was removed…
Run cleaner to inspect character codes…
Hidden Character Frequency
Run scanner to see frequency breakdown
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Chars (Before)
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Chars (After)
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Removed
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Words (Before)
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Words (After)
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Lines
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Paragraphs
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Sentences
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Bytes (UTF-8)
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Unique Hidden
Detected Hidden Characters
What Gets Cleaned — Full Reference
| Unicode | Name | Category | Mode |
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Frequently Asked Questions — Zero-Width Space Remover · AI Watermark Cleaner 2026· Unicode Text Cleaner Online
What are " Free Online invisible character Remover " in text?
Invisible characters are Unicode code points that take up no visible space but exist in the text data. Common examples include the
Zero-Width Space (U+200B), Zero-Width Non-Joiner (U+200C), and Word Joiner (U+2060). They can hide information, fingerprint text, or embed AI watermarks invisibly.How do AI watermark Cleaner 2026 work in text?
AI text watermarking uses two main techniques:
- Unicode Tags (U+E0000–U+E007F) — invisible tag characters originally designed for language tagging, now used by some AI systems to embed invisible metadata markers
- Statistical watermarking — slightly biasing word selection to create a detectable statistical pattern — this tool removes Unicode-based watermarks; statistical ones require different methods
Is my text or file sent to any server?
Absolutely not. This tool runs 100% in your browser. Files are read using the browser's
FileReader API and text is processed using JavaScript. Nothing is ever transmitted to any server. No internet connection is required after the page loads. 100% private.What file types can I upload?
Any plain-text based file:
.txt, .md, .html, .csv, .json, .xml, .rtf, .js, .css, .py, .php, .sql, .log, .srt, .vtt and more. The tool reads the raw text content of any UTF-8 or ASCII encoded file. Binary files (images, PDFs, Word docs) are not supported — use the AI Metadata Cleaner tool for those.What is a homoglyph and why is it dangerous?
Homoglyphs are characters that look visually identical to common Latin letters but come from a different Unicode block — e.g., Cyrillic
а (U+0430) vs Latin a (U+0061). They are used to fingerprint copied text or bypass plagiarism detection. Aggressive mode replaces common homoglyphs with their standard Latin equivalents.What do Safe, Smart, Aggressive, and Custom modes do differently?
Safe: Removes zero-width characters and AI Unicode Tag range only.
Smart: Adds BOM removal, soft hyphens, directional marks, variation selectors, and C0 control codes.
Aggressive: Also converts Cyrillic/Greek homoglyphs to Latin equivalents and normalises non-breaking spaces.
Custom: Full manual control — toggle each category individually. Also includes Smart Quotes and Smart Dashes conversion.
Smart: Adds BOM removal, soft hyphens, directional marks, variation selectors, and C0 control codes.
Aggressive: Also converts Cyrillic/Greek homoglyphs to Latin equivalents and normalises non-breaking spaces.
Custom: Full manual control — toggle each category individually. Also includes Smart Quotes and Smart Dashes conversion.
What is the Visualize tab for?
The Visualize tab renders your original input text with all detected hidden characters highlighted as red markers. Hovering over any red marker shows the exact Unicode code point and character name as a tooltip. This helps you see exactly where invisible characters are positioned in the text.
How does the Frequency tab work?
The Frequency tab shows a breakdown of every type of hidden character found, how many times each one appears, and a visual bar showing its relative frequency. This helps you identify patterns — for example, if one specific zero-width character is repeated hundreds of times, it may indicate deliberate watermarking.
What is the Regex panel for?
The Regex (Regular Expression) panel lets you define your own custom removal or replacement rules beyond the built-in modes. For example, you can remove all non-ASCII characters, collapse multiple spaces, convert smart quotes to straight quotes, or remove any custom pattern. Preset buttons are provided for common operations.
Can copied text from AI chatbots contain hidden characters?
Yes. Text copied from AI systems like ChatGPT, Claude, Gemini, and others may contain zero-width characters or Unicode tag sequences used for watermarking or internal formatting. Pasting such text into documents, emails, or code can cause invisible problems. This tool removes all known invisible character types used by current AI text systems.
✓ Done!