If you already run your class through Google Classroom, the last thing you want is a grading tool that asks you to leave it. But that is what most of them do. You export a stack of PDFs, or you open each submission and paste the text into a box, one student at a time, then wait, then do it again for the next one. By the time you have wrestled thirty submissions out of Classroom and into some other website, you could have graded half the set by hand.
I built ClassLens because I teach, and that upload dance was the part I refused to keep doing. This post walks through how to grade Google Classroom assignments with AI when the work never leaves Google Classroom in the first place, and why keeping the teacher in charge of every grade matters more than shaving a few seconds off the clock.
Why uploading is the wrong starting point
The submissions are already in Google Classroom. Google gives applications a supported way to read them with the teacher's permission. So the moment a tool asks you to download files and re-upload them somewhere else, it is adding a step that Google's own tools were built to skip.
That extra step costs you in ways that have nothing to do with grading. It is slow, since you are moving files by hand. Mistakes creep in, because it is easy to grab the wrong version or skip a late submission. And student work ends up sitting in a second place you have to remember to clean up. It is friction bolted onto the front of the job, and nothing more.
ClassLens skips it. You sign in with Google, point at the assignment, and the student work comes to the tool. You never touch a file.
How ClassLens grades Google Classroom assignments, step by step
Here is the whole flow. There is no upload step anywhere in it.
1. Sign in with Google
You log in with the same Google account you already use for Classroom. There is no separate password to manage and no roster to import. If you want to see what the tool does before you connect anything, there is a public demo you can open with no login at all.
2. Pick a class and an assignment
Once you are in, you choose the class and the specific assignment you want to work on. ClassLens reads what is already there through Google's Classroom APIs, so your assignments and student submissions show up on their own.
3. ClassLens pulls the submissions directly
This is the part that replaces the upload dance. ClassLens fetches the student submissions straight from Google Classroom. You do not download a single PDF or paste anything into a text box, and you are not doing it one submission at a time. The whole set is ready to grade at once.
4. Set your grading preferences
Before anything gets scored, you tell the tool how you grade. You set the strictness level, the tone and style of the feedback, and you can supply your own rubric so the scoring follows your standards instead of a generic one. This is the step that makes the output sound like your class rather than a stranger's.
5. ClassLens grades with Google Cloud Vertex AI
With your preferences set, ClassLens grades the submissions using Google Cloud Vertex AI. It handles more than essays. Short answer, document-based questions, worksheets, quizzes, programming and code, and even audio and video submissions are all in scope, so a tool that only reads typed paragraphs is not enough for most of the classes I know.
6. Review everything, then release in one batch
The results land in the Batch Review Dashboard inside the app. You see every grade and every comment, you edit anything you disagree with, and only when you are satisfied do you click "Return Checked" to release the whole set to students at once. If you would rather work inside Classroom, you can have the results saved as draft grades there instead, and you can export the whole thing to Google Sheets if you keep your own records.
At no point in those six steps did you upload a file or paste a submission. You never had to move student work out of Google Classroom by hand; ClassLens read it where it already lived.
You approve every grade before a student sees it
This is the line I will not move on. ClassLens never returns a grade to a student on its own. We removed automatic return from the product entirely in April 2026. There is no mode in which the AI sends a grade to a student without you approving it first.
The reason is simple. You are the teacher of record. The AI drafts a grade and writes feedback; you decide whether that grade is right. Read the dashboard, override what needs overriding, and release when you are ready. If a student asks for a regrade later, you handle it the way you always have, by hand. That is normal classroom practice, not an AI exception. If the compliance details matter for your district, the security page lays out how student data is handled.
Faster grading only helps if you still trust the grades. Keeping you in the loop is what makes the speed worth having.
See what the class missed, not just what each student scored
Grading a set one submission at a time tells you how each kid did. It does not tell you what the class as a whole got wrong. ClassLens generates a Knowledge Gap Report for each assignment that pulls the common misunderstandings together, so instead of noticing the same mistake on the tenth paper you see it named once, across the whole class. That is the part that changes what you teach next, and it is why I think of ClassLens as a teaching tool and not only a grading one.
What it costs and how to start
You can start on the Free plan, which covers 100 submissions a month. Pro is $10 a month and Max is $20 a month for heavier grading loads. Every new account also gets a 30-day full-access free trial, and you do not need a credit card to begin. The full breakdown is on the pricing page.
If you want to try it before you connect your Google account, open the no-login demo and explore a graded sample assignment right there in the browser. When you are ready to run it on your own class, sign in with Google and grade your first real assignment without uploading a thing.
FAQ
Do I have to upload files or paste text to grade with ClassLens?
No. ClassLens reads student submissions directly from Google Classroom through Google's APIs once you sign in with your Google account. You select the assignment and the work is pulled in for you. There is no file upload and no copy-paste step.
Does the AI return grades to students automatically?
No. Automatic return was permanently removed in April 2026. Every grade lands in the Batch Review Dashboard first, you review and adjust it, and nothing reaches a student until you click "Return Checked." You can also have grades saved as drafts inside Google Classroom.
What kinds of assignments can it grade?
More than essays. ClassLens grades short answer, document-based questions, worksheets, quizzes, programming and code, and audio and video submissions, in addition to written essays. It is best suited to practice and formative work rather than high-stakes creative assessment.
How does ClassLens grade the work?
It uses Google Cloud Vertex AI, following the strictness level, feedback style, and rubric you set before grading. You supply the standards; the tool applies them and drafts feedback for your review.
Is there a way to try it without connecting my account?
Yes. The public demo at classlens.com/demo runs with no login, so you can see a real grading pass and a Knowledge Gap Report before you sign in with Google or enter any student data.
Ready to stop uploading? Open the free demo to see it work, or sign in with Google and grade your first assignment on the Free plan. ClassLens is an AI-assistive grading tool for Google Classroom teachers, built by a teacher.