# Clean the AI slop out of your draft before anyone else spots it. > Free AI text cleaner. Removes hidden Unicode, fixes em dashes, swaps filler, and highlights the sentences that read as AI. Source: https://contengi.com/ai-slop-cleaner Free tool / AI slop cleaner Paste in anything a chatbot wrote. The cleaner strips the invisible characters, fixes the dashes, swaps the corporate verbs, and highlights every sentence that reads like a machine wrote it. It runs in your browser, so nothing you paste leaves this page. ## What the cleaner checks These are the same rules Contengi runs on every draft in the app, lifted straight out of its anti-slop standard and turned into plain code you can run on anything. ### Hidden characters Fixed automatically Zero-width spaces and joiners, byte-order marks, soft hyphens, directional marks, and Unicode tag characters, which can carry hidden instructions to the next AI that reads your text. Narrow and non-breaking spaces become normal spaces. ### Punctuation Fixed automatically Every em dash becomes a spaced hyphen and ranges get a plain hyphen. Emojis go. Curly quotes and markdown symbols are optional, for when you paste into a plain-text field. ### Words and phrases Swapped or highlighted Corporate verbs get swapped for plain ones, so utilise becomes use and in order to becomes to. Throat-clearing like “it’s worth noting that” is deleted. Stock AI words like delve, tapestry, and seamless get highlighted for you to rewrite. ### Structure Highlighted The “not X, it’s Y” contrast, fake-suspense questions, “No X. No Y. Just Z.”, a pile-up of lists in threes, sentences that all start with the same word, and a flat rhythm where every sentence runs the same length. Free Claude skill ## Take the slop cleaner into Claude. The same checks as this page, packaged as a skill for Claude. It strips the hidden characters and then does the part a regex can't, rewriting the flagged sentences while keeping your facts and your voice. [Download the skill](https://contengi.com/downloads/ai-slop-cleaner-skill.zip) ## Where a cleaner stops A cleaner fixes characters and words. Structure is where AI writing gives itself away, and fixing a straw-man sentence means rewriting it in your voice. Contengi does that before you see the draft. Every writer starts with the anti-slop standard and your brand's rules, Claude edits its own draft, plain code scans for the exact rules, and Jev checks for the patterns a word list misses. [Request beta access](https://contengi.com/beta-access) [How it works](https://contengi.com/how-it-works) A slop check from a live Contengi run. Only the flagged sentence gets rewritten, everything else stays yours. FAQ ## Common questions ### Does this remove the Claude watermark? No. Claude’s watermark is statistical, carried in which words Claude chooses, and Anthropic says it adds no hidden characters. Nothing that edits characters can touch it. The cleaner removes the hidden characters that other tools and copy-pasting leave behind, and highlights the writing habits readers spot. ### Does ChatGPT put hidden characters in its text? Sometimes. In April 2025 researchers caught o3 and o4-mini adding narrow no-break spaces to long answers. Copying out of any chat window, PDF, or Google Doc can also pick up zero-width and non-breaking spaces. Paste a draft in and the cleaner counts them for you. ### Will this get my text past an AI detector? No promises there. Detectors and watermarks read word choice and statistics, and the cleaner leaves those alone. It’s built to make your writing better to read. ### Is my text sent anywhere? No. The cleaner runs in your browser with plain code, no AI model and no server. Close the tab and it’s gone. ### Why are em dashes on the list? Chatbots use them far more than people do, and readers have noticed. One em dash won’t sink a post, ten in a LinkedIn update will. The cleaner swaps each one for a spaced hyphen, which reads the same. ### What is the slop score? A rough count of AI tells per 100 words on a scale of 0 to 100, weighted so a “not X, it’s Y” sentence counts for more than a stray emoji. Under 20 reads clean. Treat it as a pointer to where to look, a human editor still has the final say. ### How do I use the Claude skill? Download the zip. In Claude Code, unzip it into ~/.claude/skills/ and ask Claude to clean a draft. In the Claude apps, upload the zip in your Skills settings. The skill runs the same checks as this page and rewrites the flagged sentences too. ## Content that sounds like you, from the first draft. Contengi writes from your knowledge base and cleans every draft before it reaches you. Fewer highlights, more publishing. [Request beta access](https://contengi.com/beta-access) [Try it out](https://contengi.com/demo) Also free: the [LLM visibility check](https://contengi.com/llm-tracker), for seeing whether AI engines mention your brand.