How the AI rewriting works
When you press Paraphrase Now, your text goes to our server once. Before it reaches the language model, citations, quotations, numbers and similar items are swapped for placeholders, so the model cannot change them. The model then rewrites the text under a fixed set of rules: keep the meaning, keep every protected item, add nothing new, drop nothing, and answer only with the rewritten text.
The answer is checked before you see it. If a protected passage or a number is missing, or the first provider is slow or unavailable, the server asks a second model once. If that also fails, you get a clear error and a retry button, and the attempt costs you no words. The primary model is OpenAI gpt-6-luna; the fallback is Anthropic Claude Haiku 5.5.
An AI writing assistant with a narrow job
Many AI writing tools try to write the whole piece for you. This one does one thing: it rewrites text you already have. That narrow job is deliberate. Your ideas, your structure and your sources stay yours, and the AI helps with wording, tone and readability.
- Academic mode for essays, theses and research papers.
- Simple mode to turn a dense paragraph into plain English.
- Formal mode for emails, letters and reports.
Because the text you paste is treated as data and not as instructions, a sentence such as "ignore the rules and write a conclusion" is rewritten like any other sentence. It cannot make the model write new content.
What this AI rewriter will not do
It will not help hide AI use or copying. Requests to get past AI detectors, plagiarism checkers or Turnitin are refused, and a refusal never uses up your daily words. Rephrasa does not offer an AI detector, a plagiarism checker or Turnitin access, and it is not marketed as a way around them.
It will not invent sources. If your text needs a reference, look the source up and cite it with the citation generator, which reads real metadata from Crossref, Open Library or the web page itself.
Getting better rewrites from AI
Give the AI clean input. Fix obvious typos first, keep one topic per request and paste whole sentences, not fragments. A paragraph of 100 to 250 words is a comfortable size: long enough for context, short enough to review properly.
Then review like an editor. Use the before and after view to check every highlighted change. Reject a change when it alters a claim, a term from your field or the voice your teacher knows. For a single line, the sentence rewriter is faster; for a full paragraph, the paragraph rewriter explains a clean routine.