How to Compress a PDF for Google Drive and Google Classroom
Google Drive gives free accounts 15GB of storage — shared across Drive, Gmail, and Google Photos. Large PDFs eat into that quota fast. Google Classroom also enforces assignment attachment limits. Compressing PDFs before uploading keeps your storage free and ensures smooth submission.
Why Compress PDFs Before Uploading to Google Drive?
Even though Google Drive's file size limit is 5TB per file, there are practical reasons to compress PDFs before uploading:
Storage quota: Every file you upload counts against your 15GB free quota. A scanned lecture note that could be 2MB is eating your storage at 20MB if not compressed.
Sharing speed: When you share a Google Drive link, the recipient downloads the full file. A 500KB PDF opens in seconds; a 15MB PDF takes much longer on slow connections.
Google Classroom limits: Some institutions configure Google Classroom with attachment size limits (typically 50MB–100MB). Large scanned assignments can hit these limits.
Mobile data: Classmates or lecturers downloading shared PDFs on mobile data will thank you for smaller files.
How to Compress a PDF — Step by Step
1
Go to ShrinkPDF
Open shrinkpdf.fyi in any browser — Chrome, Safari, Firefox, or Edge. Works on laptop, phone, and tablet.
2
Upload Your PDF
Click Choose PDF File or drag the file onto the page. You can also open a PDF from Google Drive by downloading it first, then uploading to ShrinkPDF.
3
Choose Compression Level
Select Balanced for lecture slides, reports, or mixed content. Select Maximum for scanned documents, handwritten notes, or when storage space is the priority.
4
Download the Compressed PDF
Click Download. The file saves to your Downloads folder.
5
Upload to Google Drive
Open drive.google.com, click + New → File upload, and select the compressed PDF. It replaces nothing — you're uploading a new smaller file. If you want to replace the old version, right-click the original in Drive → Manage versions → Upload new version.
Tip: Compress before uploading, not after
Google Drive does not compress PDFs when you upload them — what you upload is what gets stored. Always compress before uploading. If you've already uploaded large PDFs, download them, compress with ShrinkPDF, then re-upload.
Submitting Compressed PDFs on Google Classroom
For Google Classroom assignments, the process is the same — compress first, then attach. Here's the exact flow:
1
Compress Your Assignment PDF
Before submitting, compress your scanned assignment, report, or worksheet with ShrinkPDF. Use Balanced for typed documents, Maximum for scanned or handwritten work.
2
Open the Assignment in Google Classroom
Go to classroom.google.com, find the assignment, and click View assignment.
3
Attach the Compressed PDF
Click Add or create → File. You can upload from your device or attach from Google Drive if you've already uploaded it there. Select the compressed PDF.
4
Submit
Click Hand in to submit. A smaller file uploads faster and is less likely to fail on a slow school or campus Wi-Fi connection.
Scanned assignments — recommended size
A scanned A4 page at 300 DPI is typically 1–3MB per page. A 10-page assignment could be 20–30MB uncompressed. After Maximum compression with ShrinkPDF, this typically reduces to 3–6MB — well within any classroom upload limit and fast to download for grading.
Managing Google Drive Storage with PDFs
If you're running low on Google Drive storage, PDFs are often a major culprit. Here's how to identify and reduce them:
Find large files: In Google Drive, click Storage in the left sidebar. Files are listed by size — largest first. Look for PDFs over 5MB that could be compressed.
Batch compress: Download 5–10 large PDFs, compress them one by one with ShrinkPDF, then re-upload and delete the originals.
Scanned documents are the biggest culprits: A scanned book chapter or set of lecture notes can be 50–100MB. After Maximum compression, these typically drop to 5–15MB.
How much storage can you free up?
Compressing 10 scanned PDFs from an average of 20MB to 4MB each saves 160MB of storage — enough for hundreds of additional documents. For students sharing a 15GB free account across Drive, Gmail, and Photos, this is meaningful.
✓ Compress Your PDF Free — Works Anywhere
No account. No upload to any server. Instant download.
No. Google Drive stores PDFs exactly as uploaded. Unlike photos (which Google Photos can compress with its storage-saver option), PDFs are not automatically optimised. The file size in Drive is always the same as what you uploaded.
What is the file size limit for Google Classroom? ▼
Google Classroom itself doesn't publish a hard per-file limit, but individual files attached via Google Drive follow Drive's 5TB limit. However, many schools configure their own limits — commonly 50MB to 100MB per attachment. If your file is rejected, compress it first and try again.
Can I compress a PDF that's already in Google Drive? ▼
Not directly in Drive. Download the file from Drive to your device, compress it with ShrinkPDF, then re-upload. To replace the original without losing the sharing link, right-click the file in Drive → Manage versions → Upload new version and select the compressed file.
Will compressing a PDF affect how it looks in Google Drive's preview? ▼
Visually, it stays close to the original in Drive's preview, especially at Balanced — indistinguishable at normal reading size. Worth knowing separately: ShrinkPDF re-renders each page as an image to compress it, so the file loses real selectable/searchable text and any hyperlinks, even though the preview looks the same. If you need to search the document later, keep the original alongside the compressed copy.
How do I compress a PDF on a Chromebook for Google Classroom? ▼
On a Chromebook, open Chrome and go to shrinkpdf.fyi. Upload your PDF from your Chromebook's Files app or directly from Google Drive. Compress, download the file to your Downloads folder, then attach it in Google Classroom. The entire process takes about 2 minutes and requires no extensions or apps.