Built by a professor,
for students' sake.
This site was created by a professor who wanted the very best for their students — not just good grades, but a good education. They watched capable, curious students slowly hand their thinking over to AI tools, and saw what happened next: when the machine does the writing, the student skips the learning. A degree earned that way looks the same on paper but means far less in practice.
The concern was never punishment. It was dependence. A student who leans on AI for every essay arrives at graduation without the skills the degree is supposed to certify — critical thinking, clear writing, the patience to wrestle with a hard idea. That student has been failed quietly, long before any grade is posted.
So CheckThisPaper exists to help the people on the other side of the desk. It gives professors practical, transparent tools — a writing scan, hidden assignment checks, a policy writer — that make integrity easier to uphold and easier to teach. Every flag is a conversation starter, not a verdict. The goal is always to bring a student back to doing their own thinking, never to catch them out.
And it will stay free — and easy. There is nothing to download, install or sign up for: every tool works right in your browser, in the time it takes to paste a paragraph. Integrity tools should not be locked behind subscriptions that only wealthy institutions can afford. If this site helps your classroom, a small donation helps keep it online and free forever — for every professor, everywhere.
CheckThisPaper vs. Turnitin
Think of this as the free version of the big similarity checkers — built by a professor, just like you, for colleagues who don't have an institutional subscription or don't want one.
| CheckThisPaper | Turnitin-style services | |
|---|---|---|
| Cost | ✓ Free forever — supported by optional donations | Institutional subscription; individual educators often can't get access |
| Who built it | ✓ A professor, just like you — not a corporation | A commercial company selling to institutions |
| Access | ✓ Open this page and paste — no account, no login | Account required; usually only through your institution's LMS |
| Your students' text | ✓ Never leaves the browser — nothing is stored or uploaded | Submissions are uploaded and retained in the provider's database |
| Results | ✓ Transparent line-by-line flags explained in plain language you can discuss with the student | An opaque percentage score with limited explanation of why |
| Extras | ✓ Hidden assignment checks, an AI policy writer, and a response playbook included free | Similarity and AI scoring; grading tools sold as add-ons |
A fair word: commercial checkers search a vast archive of past submissions and the live web, which no browser-only tool can replicate. CheckThisPaper trades that for privacy, speed, transparency — and a price every educator can afford: zero. Many professors use both. We'd rather be your everyday first pass than your only tool.
Who this free AI checker is for
CheckThisPaper is free AI detection built for anyone who reads student writing for a living — no accounts, no downloads, no subscriptions.
Professors & lecturers
Scan essays, discussion posts and take-home exams before you grade — paste the text, click once, and get flags you can act on in seconds.
Dissertation chairs & advisors
Review AI-assisted drafts and thin citations in committee submissions before they reach the table, so feedback focuses on the scholarship.
Grad TAs & writing centers
A fast second pass on tall stacks of submissions — use the flags to open a conversation in office hours or a writing consultation, not to accuse.
High school teachers
Budget-free integrity support for the AI era: no accounts, no installs, and results explained in plain language you can share with students and parents.
Integrity & honor code offices
Gather a consistent, documented first look at a submission — evidence to investigate and discuss, never automatic proof of misconduct.
Educators everywhere
Tools that work on any laptop or phone, in any classroom — because integrity support shouldn't be locked behind subscriptions only wealthy institutions can afford.
An aid, not an accusation
Every result is a hint to investigate and discuss with the student — never automatic proof of misconduct.
Free & effortless
No downloads, no accounts, no credits, no paywall. Open the site, paste text, click once — it all runs in your browser and nothing you paste is stored or sent anywhere.
Integrity as teaching
The best outcome is not catching AI use — it is a student who no longer needs it.
How many educators has this helped?
Keep a running tally of educators CheckThisPaper has saved time for — a little high-five for the toolkit, just for fun.
… educators helped
Be the first — one click adds you to the educators helped tally.
your personal tally — saved in this browser only
Help keep CheckThisPaper free forever
Hosting and development are covered out of pocket. If these tools have helped your classroom, a small contribution keeps them free for everyone.