March 22, 2026
Teaching is already a full plate -- lesson planning, grading, administrative tasks. Wrestling with PDF files should not eat into the time you have left. But the reality is that PDFs come up constantly: handouts need combining, exams need splitting, scanned work is too large to upload, and someone always manages to scan a page sideways.
Here are five PDF scenarios teachers deal with all the time, each with a quick solution.
Scenario 1: Combining Multiple Handouts Into One PDF
End of semester, you want to bundle all your weekly handouts into one review packet for students. Or at the start of a new term, you need the syllabus, reading list, and first week's handout in a single upload for the LMS.
Use the merge tool: drag all your handout PDFs in, arrange them in chapter order, and merge with one click. If the combined file ends up too large for your school's LMS (most cap at 20-50MB), run it through the compress tool afterward.
Scenario 2: Extracting Specific Pages from a Test Bank
You have an 80-page test bank PDF. For this week's quiz, you only need the questions on pages 15-18 and 42-45.
Use the split tool: upload the test bank, type "15-18, 42-45" in the page range field, and the tool extracts just those pages into a new PDF. Your original test bank stays untouched.
Quick note: the page numbers here refer to the PDF page numbers (shown at the bottom of your PDF reader), not the page numbers printed on the document itself. If your test bank starts with a table of contents, the numbering might be off by a few pages.
Scenario 3: Compressing Scanned Student Work
End of term archiving. You scanned 30 students' paper submissions, each 5 pages long, and the resulting PDF is 300MB. Good luck uploading that to the school's records system or emailing it to a parent.
Use the compress tool: set a reasonable target size. For archival purposes, 20-30MB is usually sufficient. For emailing, aim for 8MB or less. Scanned documents compress particularly well because each page is an image to begin with.
Scenario 4: Rotating Pages That Were Scanned Sideways
When using a flatbed scanner, it is easy to place a page the wrong way around. Or you received a PDF where a few landscape-orientation pages force you to tilt your head to read them.
Use the rotate tool: upload the PDF, select which pages need rotating, choose the direction (90 degrees clockwise, counterclockwise, or 180 degrees), and you are done.
Scenario 5: Converting Whiteboard Photos to PDF
You snapped photos of your whiteboard notes after class and want to share them with students as a PDF. Or you photographed pages from a textbook with your phone and need a clean digital copy.
Use the images-to-PDF tool: upload your phone photos (JPEG or PNG), arrange them in order (first lecture through last), select A4 page size, and convert. The output is a tidy PDF you can upload to Google Classroom or any LMS.
If the resulting file is too large -- phone photos are typically 4000 by 3000 pixels or more, so each one is several MB -- compress it after conversion.
A Note on Student Data Privacy
This matters a lot for teachers. Student grades, assignments, and personal information are sensitive data. Every tool on PDF Under runs entirely in your browser. Your files are never uploaded to any server. The student data you are processing stays on your computer from start to finish, with zero risk of it being sent elsewhere.
That is a meaningful difference from tools that require uploading your files to a cloud server for processing.