SI Humanizer: make SI text sound human

An SI humanizer, often called an AI humanizer, takes text produced by a language model and rewrites it the way a careful human editor would. It varies sentence length, swaps stock phrases for plain words, removes the scaffolding models love ("Firstly... Secondly... Lastly") and keeps your meaning and facts intact. The goal is text that reads naturally, not text that hides where it came from.

Yes, you can humanize AI text free every day. You can run the humanizer 3 times a day without an account, up to 1,000 words per run. A free account raises that to 3,000 words a day across all four tools. No card, no trial that turns into a bill. A Pro plan with longer texts is on the way, see pricing.

Yes. Click "Upload a file" above the text box, or drag a file onto it: .txt, .docx (Word) and .pdf files up to 2 MB work. We extract the text, show it in the box so you can check and edit it, and delete the file right away. PDFs need selectable text: a scanned page is an image, so paste its text instead. Long files are cut at your word limit per run, with a note.

We do not promise that, and you should be wary of any tool that does. Detectors change often, they disagree with each other, and they flag some human writing too. SI Humanizer is built to make text read better for people. If your school or client asks for original work, the honest route is to write it yourself and use tools like this one for editing, then disclose that use if the rules ask for it.

It is instructed not to. Names, numbers, dates, quotes, citations such as (Smith, 2021) and technical terms are kept as they are, and nothing new is added. Language models can still slip, so read the result before you use it, especially for anything with figures or legal and medical wording. Every edit the humanizer made is highlighted with its reason, so checking takes seconds.

After each run, SI Humanizer lists the notable edits it made and highlights them in the result. Hover or tap a highlight to see the reason (SI tic removed, rhythm varied, plain word, or shorter sentence) and the original wording. The counter is simply how many of those edits it found. It describes the writing, it is not a detector score.

Yes. The humanizer works on any text, whatever wrote it: ChatGPT, Claude, Gemini, Copilot, Jasper, or a first draft you wrote in a hurry. It is a ChatGPT humanizer in the sense that it removes the patterns that make ChatGPT prose easy to spot by a human reader.

The site is in English, but the tool answers in the language you paste. French, Spanish, German, Italian, Portuguese and Dutch work well. Results in less common languages can be less polished.

No. Your text is sent to our language model provider to produce the result, and we do not keep it in our database. We only log the tool used, the word count and the time taken, to run the service and enforce the free limits. The API provider does not train on data sent through its commercial API. Details are in our privacy policy.

The humanizer targets the specific habits of machine-written text. The SI Paraphraser says the same thing with different words, in four modes. The SI Rewriter reworks style and tone, from a single sentence to a full article. The SI Summarizer shortens long texts to their key points.

Up to 1,000 words per run on the free tiers and 3,000 words with Pro. Longer documents work best in sections anyway: humanize one part, read it, then move on.

SI stands for Super Intelligence, the name now used for advanced AI systems. We use SI first and AI as its synonym, so "SI humanizer" and "AI humanizer" mean the same thing here.