Remove Zero-Width Characters
Detects and removes invisible zero-width spaces, non-joiners, joiners, and BOM markers that AI systems often embed in text.
Examples
- Zero-width space (U+200B)
- Zero-width non-joiner (U+200C)
- BOM (U+FEFF)
ChatGPT, Claude, and Gemini leave fingerprints — invisible Unicode, narrow no-break spaces, em dashes, tracking links. CopyCleanse exposes every one and strips it, entirely in your browser.
Free, no sign-up, nothing leaves your browser.
CopyCleanse automatically detects and fixes these AI text artifacts, making your content undetectable and professionally formatted.
Detects and removes invisible zero-width spaces, non-joiners, joiners, and BOM markers that AI systems often embed in text.
Examples
Converts curly quotes, guillemets, low-9 quotes, primes, and modifier apostrophes to standard straight quotes for natural, consistent text.
Examples
Converts typographic em dashes (—), en dashes (–), horizontal bars, and hyphen/minus variants to standard hyphens with proper spacing.
Examples
Removes tracking parameters from URLs that identify content as AI-generated, including the utm_source=chatgpt.com tag ChatGPT now appends to every cited link, plus params from Perplexity, Grok, DeepSeek, Mistral, and more.
Examples
Strips the invisible characters used to fingerprint AI text: word joiners, invisible operators, Unicode tag characters, variation selectors, directional marks, and filler characters.
Examples
Removes the internal citation markup that ChatGPT sometimes leaks into copied text when using web search.
Examples
Replaces the Unicode ellipsis character (…) with three standard periods for consistent formatting.
Examples
Strips invisible soft hyphen characters that AI systems insert for word-breaking hints.
Examples
Converts fullwidth ASCII letters, digits, and punctuation (Ａ-Ｚ, ０-９, ！？) to standard ASCII equivalents.
Examples
Converts unusual whitespace variants (em space, en space, hair space, etc.) to standard spaces.
Examples
These telltale signs often appear in AI-generated content and can trigger detection systems or look unnatural to readers. We recently expanded coverage to catch the latest watermark characters, leaked citation markers, and tracking links from ChatGPT, Claude, Gemini, Perplexity, Grok, DeepSeek, and more.
CopyCleanse identifies and removes the subtle markers that expose AI-generated content. All processing happens locally in your browser — your text never leaves your device, ensuring complete privacy.
Everything you need to know about cleaning AI-generated text.
Whitespace fingerprinting refers to the practice of AI systems embedding invisible Unicode characters (like zero-width spaces, non-breaking spaces, or BOM markers) into generated text. These invisible markers can be used to identify AI-generated content or track its origin, even though they are not visible to humans.
Simply paste your ChatGPT-generated text into CopyCleanse and click "Clean Text". Our tool automatically removes hidden whitespace characters, normalizes smart quotes to standard quotes, converts em dashes to regular dashes, removes AI tracking URL parameters, and fixes other telltale signs of AI generation. The cleaned text is then copied to your clipboard.
Yes, CopyCleanse is completely free. There are no hidden fees, subscriptions, or premium tiers. All features are available to everyone at no cost.
No. CopyCleanse processes all text entirely in your browser using JavaScript. Your text never leaves your device and is never sent to any server. We have no ability to see, store, or access any content you paste into the tool.
CopyCleanse works with text from all major AI platforms including ChatGPT (OpenAI), Claude (Anthropic), Gemini (Google), Copilot (Microsoft), Bard, and others. Our cleaning algorithms detect common patterns across all these platforms.
AI systems may add invisible characters for several reasons: to aid in formatting and word-wrapping, as artifacts of their tokenization process, for potential watermarking purposes, or as byproducts of Unicode normalization. Regardless of the reason, these characters can make text look unprofessional and may trigger AI detection tools.
Smart quotes (also called curly quotes) are the curved quotation marks instead of straight quotes. While aesthetically pleasing in documents, they can cause issues in code, databases, and some platforms. They're also a common sign of AI-generated text since AI models often use them.
CopyCleanse detects URLs in your text and removes tracking parameters that identify AI sources. This includes parameters like source=chatgpt, utm_source=openai, ref=claude, and similar tracking codes. The rest of the URL remains intact, preserving any legitimate query parameters.
Yes! CopyCleanse is fully responsive and works on mobile phones and tablets. Simply paste text into the input field, tap "Clean Text", and the cleaned result will be ready to copy.
While CopyCleanse removes many technical artifacts that AI detectors look for, no tool can guarantee your text will pass all AI detection systems. AI detectors also analyze writing style, patterns, and statistical properties of text. CopyCleanse focuses on removing the invisible technical fingerprints that are dead giveaways of AI origin.
AI detection tools are becoming increasingly sophisticated, scanning for patterns that reveal machine-generated content. Even when AI assists with legitimate work, these subtle artifacts can trigger false positives.
Clean up AI-assisted research and writing
Ensure your work looks naturally human-written
Remove tracking parameters that reveal your tools
Learn more about AI text detection, invisible characters, and how to keep your content clean.
Learn how AI systems embed invisible markers in generated text and why it matters.
A step-by-step guide to cleaning AI-generated content.
Understanding the methods used by AI detection systems.