Paraphrase Self-Check — Compare your paraphrase against the original with transparent rules — patchwriting detection that teaches while it checks

Common mistakes the Paraphrase Self-Check prevents

Synonym swapping is the classic failure the stopword skeleton catches. Students replace important with significant, utilize with use, and big with substantial, then submit a sentence that walks the original's exact grammatical path: the stopword sequence - the, of, to, and, in - survives untouched while the content words rotate. Plagiarism software highlights exactly that pattern, and graders recognize it even faster because it reads as translation, not thinking. The fix the tool keeps repeating is mechanical and effective: close the source, say the idea aloud from memory, write down what you said. Structure collapses when the scaffold is gone; that collapse is the paraphrase.

The summary-instead-of-paraphrase swap costs points in the opposite direction. A student compresses a 120-word passage to 45 words, checks the overlap score, sees a healthy 18 percent, and moves on - but the assignment said paraphrase, and the grader wanted the full idea rebuilt, not a digest. The length-ratio check exists because paraphrase and summary are different tools with different jobs: a paraphrase preserves the whole idea at similar depth; a summary compresses for your own roadmap. Both are honest; submitting one when the other was asked reads as not knowing the difference, which is a worse signal than a clunky paraphrase.

The citation fallacy - new words, no citation - is the integrity error this tool refuses to let you forget, which is why the checkbox sits above the verdict instead of buried in a footnote. The misconception has a logic to it: I changed the wording, so what is mine? But the citation covers the idea, not the phrasing, in every style guide from APA to Chicago; a flawless paraphrase without attribution is still presenting someone else's insight as your own. The honest workflow the tool encodes: paraphrase well, cite always, and quote deliberately when the original's wording is the point - three skills, one habit of attribution.

Who the Paraphrase Self-Check is for

For the moment after you have written the paraphrase and before you have submitted it — and for the ESL students who get accused of patchwriting while genuinely trying to be honest, because academic paraphrasing norms are not intuitive in any language. Writing-center tutors can run a whole session through it; the report exports cleanly. It is deliberately not a plagiarism detector and makes no detector claims: it cannot see databases, only the two texts you paste. What it does is make the difference between paraphrasing and copying visible and learnable, one checked passage at a time.

It is explicitly not for fake certainty. Every estimate the Paraphrase Self-Check produces is a planning instrument, not an official record — your registrar, syllabus and instructor hold the authoritative versions. The tool's job is to make your next decision faster and better-informed.

How to use the Paraphrase Self-Check — step by step

• Step 1: Paste the original passage from your source
• Step 2: Paste your paraphrase — ideally written with the source closed
• Step 3: Tick the citation box if your version has one
• Step 4: Open each flag and read the why — that is the lesson
• Step 5: Rewrite flagged spans from memory, then re-check until it passes

Total time: under two minutes for a first pass, and the interactive version embedded above persists as long as the tab is open. Nothing is transmitted to any server at any point — the entire tool runs in your browser's JavaScript, which is why it also works offline once the page has loaded.

What makes this paraphrase self-check different

Paraphrasing is the most-misunderstood skill in the integrity canon: students believe swapping synonyms makes text theirs, patchwriting sails through Turnitin until it does not, and the AI humanizer services that promise to fix this make prose worse while teaching nothing. This checker takes a different path — your source passage and your paraphrase, side by side, judged by five transparent rules with the reasoning shown. It measures shared content vocabulary (the writing-center rule of thumb is under 25 percent), finds every verbatim run of four or more words — the patchwriting signature plagiarism software highlights — reads the stopword skeleton to catch synonym-swap-only rewrites that keep the original's grammatical path, checks that you actually restructured rather than mapped sentence for sentence, and verifies the length ratio says paraphrase instead of summary. A separate citation checkbox exists because the biggest misconception in the field needs its own line: a perfect paraphrase still requires a citation. Every finding expands to explain why the rule exists, so the second paraphrase is better than the first.

• Five transparent rules with the why shown for each
• 4+ word verbatim-run detection (the patchwriting signature)
• Stopword-skeleton analysis catches synonym-swap-only rewrites
• Length-ratio check separates paraphrase from summary
• Copyable report formatted for writing-center sessions

Most free calculators in this space are ad-fenced, login-walled, or upload your input to a server for processing. This one does none of those things — the privacy posture is the feature, not the fine print.

Paraphrase Self-Check accuracy, limits and honest caveats

The math inside is deterministic and exact for the inputs you give it; uncertainty comes from the inputs. Grade estimates assume the syllabus weights are correct and your predicted scores are honest. Citation formatting follows the current official style manuals but cannot verify facts about your source. Deadline plans compress when reality interrupts. Wherever an institutional rule could override the tool — registrar scales, program-specific rubrics — the interface says so directly instead of pretending otherwise.

When a decision actually matters — academic standing, scholarship eligibility, graduation audit — confirm the number with the office that owns it, then use this tool for the weekly decisions that lead there.