AI study tools that take PDF, PowerPoint, audio, or video differ in what they accept and what they charge. Adobe Acrobat’s flashcard maker is free to start with no sign-up or credit card required, takes PDFs, lecture slides, readings, and notes up to 100MB and 600 pages, and builds flashcards; its page lists no audio or video.
Students who need to turn lectures and readings into flashcards and quizzes usually want to know two things before they commit: what the free plan allows and what the first paid step buys. The answers differ by tool, and prices change often. The sections below compare published free limits and paid steps, using each tool’s own pages where possible and noting where sources disagree. Check each vendor’s pricing page before you pay. Prices are in US dollars and checked against third-party pages where noted.
Pricing and Free Upload Limits: What Do the Plans Allow?
Adobe Acrobat’s flashcard maker is free to start, with files up to 100MB and 600 pages, and its page lists no paid tier. Gemini Notebook, formerly NotebookLM, has a free plan with up to 500,000 words or 200MB per source and 50 sources. Quizlet’s free plan has ads and limits Learn and Test modes, and it lets you paste up to 100,000 characters. Knowt lists a free Basic plan, and RemNote has a free plan too. Anki is free on desktop and Android, and AnkiMobile for iOS is a one-time $24.99, according to comparison sites. The table lists free plans and the next paid step where sources agree. Where they disagree, as with Knowt’s paid price, check the vendor’s page. Free plans often change without notice, so screenshot the page you relied on. Keep your own backup of any deck you cannot export. Compare the same unit across tools before you decide.
| Tool | Free plan | Paid step | Upload limit |
| Adobe Acrobat flashcard maker | Free to start; no sign-up or credit card | None listed | 100MB and 600 pages per file |
| Gemini Notebook | Free plan; 50 sources | Paid Google AI plans raise source counts | 500,000 words or 200MB per source |
| Quizlet | Free with ads; capped Learn and Test | Plus, $35.99 per year or $7.99 per month | 100,000 characters pasted per session |
| Knowt | Free Basic plan | Ultra; sources disagree on price | Starts from PDF, PPT, video, or audio |
| RemNote | Free plan | Pro, $8 per month billed yearly | Plan limits on PDFs and AI credits |
| Anki | Free on desktop and Android | AnkiMobile on iOS, $24.99 one time | Uploads text and deck files |
Pricing, Upload Limits, and File Size: What Changes When You Pay?
Usually usage caps and AI features, not the per-file size. Quizlet Plus is listed at $35.99 a year or $7.99 a month and caps practice tests at three and Learn rounds at 20 a month, according to a comparison of its upgrade page, and Plus Unlimited at $44.99 a year removes those caps. For Gemini Notebook, a third-party guide says paid Google AI plans raise the number of sources but every source keeps the same 500,000-word and 200MB ceiling. RemNote Pro is listed at $8 a month billed yearly. Adobe Acrobat’s page lists a 100MB and 600-page limit and no paid tier. If a file is too big, splitting it by chapter costs nothing and usually works. Pay only when a cap, not a file limit, blocks your study plan. A student discount or a school license can lower costs, so ask before you subscribe.
Frequently Asked Questions
Is it worth paying for an AI study tool?
Pay only after the free plan blocks something you need, such as a cap on practice rounds or the number of sources. Try the free plans on one real chapter first, note which limits you hit, and compare them with the paid step. Many students never need to pay, especially if they split large files and use free scheduling tools. Keep a note of which limit you hit and when. Share the findings with your study group.
Do free plans limit file size?
Often, and the limit may not change when you pay. Adobe Acrobat’s page lists 100MB and 600 pages with no paid tier, and Gemini Notebook’s help page lists 200MB and 500,000 words per source for uploaded files. Paid plans tend to raise usage and source counts rather than per-file size, so splitting a long PDF is the usual fix. Check the tool’s page for the exact unit, because words, pages, and megabytes differ.
How do I avoid being charged by mistake?
Read the trial terms before you start. Some tools offer a free trial only on annual plans, and an annual plan bills for the full year unless you cancel in time. Set a calendar reminder for the day before the trial ends, and use a payment method you can monitor. Ask your school whether it already licenses a tool. Cancel before the renewal date if you decide not to continue.
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