Some study guide tools accept two files per upload at up to 25MB each, while others allow far larger sources, so check both the count and the size before you upload. Adobe Acrobat’s flashcard maker accepts files up to 100MB and 600 pages, is free to start with no sign-up or credit card required, and accepts multiple files.
A limit stated as a size is only half the story, because tools also limit how many files you can add at once and how many you can keep. A course packet can fail on any of these. This article compares two published styles of limit, a small per-upload cap and a large per-source cap, explains what counts as one source, and shows how to prepare files so they fit. Details come from each tool’s own pages where possible and from comparison pages where noted. Limits change, so confirm them before you rely on one. Prices and caps can change at any time. Start by listing every file you need to upload.
Source Limit of 200MB or 500,000 Words: What Counts as One Source?
Gemini Notebook, formerly NotebookLM, lists up to 500,000 words or 200MB for each uploaded source, and free users can include up to 50 sources. Its help page says inactive sources still count toward the limit, that PDFs have no page limit, and that video length is not limited unless the caption file passes 500,000 words. Each file you add is one source, so merging short handouts into one file saves slots. A word cap matters for typed text. At about 500 words a page, a 600-page typed PDF holds roughly 300,000 words, which is under that cap, while a scanned book is more likely to reach the 200MB limit first. Check both numbers for your file. Write both limits for each tool on one page. Keep the original files so you can split them again.
| Tool | Per-upload limit | Per-file or source limit | Source or file count |
| Quizlet study guide upload | Two files at a time | 25MB each; .docx, .pdf, .pptx | Not listed on the upload page |
| Gemini Notebook | Not listed | 500,000 words or 200MB per source | 50 sources for free users |
| Adobe Acrobat flashcard maker | Multiple files allowed | 100MB and 600 pages per file | A maximum applies |
| Knowt | Up to 30 files, per an older page | Not listed | Not listed |
| StudyPDF free plan | Three files per upload | 300 pages per file | About four materials a week |
Features to Check: Do AI Upload Tools Turn Notes Into Study Guides With Sources You Can Verify?
Look for study guides that tell you where each point came from. Adobe’s Student Spaces FAQ says answers and generated study tools include citations you can select to see the source passage, and its flashcard maker lists study guides, quizzes, and mind maps alongside flashcards. Quizlet’s upload page says one upload produces a study guide, flashcards, and quizzes, and that you can highlight and mark up the guide. Gemini Notebook generates study guides, flashcards, and quizzes from your sources. Typed notes with clear headings give the best results, so clean up scans and photos first. Check each guide against your own notes, and keep the original files. Prices and plans change, so confirm each feature on the tool’s page. Try one chapter first to see how the guide is organized. Ask the tool to focus on specific sections if the guide is too long.
Frequently Asked Questions
How do I fit more than two files into a two-file upload?
Merge related files before you upload. Combine the handouts for one topic into a single PDF, keep each merged file under 25MB, and name it by unit. Upload in rounds, two files at a time, and keep the study guides separate by unit so you can check each one. Do not merge unrelated courses, because the guide will mix them. Check the merged file opens and that the text is selectable. Back up the originals. Rename merged files with the unit and date.
Which limit hits first, 200MB or 500,000 words?
It depends on the file. Scans and image-heavy decks usually reach a megabyte limit first. Long typed documents reach a word limit first. Check the file’s size in its properties and estimate its word count, then compare both against the tool’s numbers. If either is close, split the file at chapter breaks. Estimate words at about 500 per typed page as a rough guide. Split at the nearest chapter break.
Are these limits the same on mobile or school accounts?
Not always. Gemini Notebook’s help page says its mobile app accepts PDFs, websites, audio, YouTube links, and copied text as sources, which is a narrower list than the web version. School accounts may also carry different settings, so check your school’s guidance and test an upload with a small file before you rely on a tool. Test on the device you will study on.
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