Every August and September, the same problem shows up in millions of inboxes and homework portals: a photo of a worksheet, a video project, or a scanned form is “too large” to upload. Google Classroom rejects it, Canvas times out, or Gmail just refuses to attach it. This guide covers exactly how to shrink each file type — photos, videos, and PDF scans — down to a size that uploads cleanly, plus a quick-reference table of the upload limits you’re most likely to run into this school year.
Compressing Photos for Assignment Uploads
Photos of handwritten work, lab notebooks, or art projects are one of the most common back-to-school upload headaches. Modern phone cameras shoot at 12+ megapixels, producing files that can easily run 5-15MB each — several times larger than most portals actually need for a readable submission.
The fix, in three steps:
- Open AllMediaTools Image Compressor in your browser — no install, no account.
- Upload the photo (or drag in several at once if you’re submitting multiple pages).
- Download the compressed version — a clear, readable photo of a worksheet typically drops from 8-10MB down to under 500KB with no visible loss in the text or handwriting.
Why this works: most of a phone photo’s file size comes from resolution and detail far beyond what’s needed to read handwriting or view a printed page on a screen. A quality setting of 75-85% on a compressor removes that excess without making the text blurry or the image noticeably different at normal viewing size.
A few tips specific to schoolwork photos:
- Shoot in good, even light — poor lighting means teachers may ask you to redo a blurry submission, which costs more time than compressing does.
- If a page has small handwriting or fine diagrams, don’t go below about 70% quality — that’s usually where fine detail starts to visibly degrade.
- For multiple pages, compress each individually rather than trying to combine them into one giant image — it uploads faster and is easier for a teacher to review.
For more detail on getting this balance right across different subjects (photos vs. scanned documents vs. screenshots), see our full guide on compressing images without losing quality.
Compressing and Trimming Video for Project Submissions
Video assignments — presentations, lab demonstrations, film class projects — run into upload limits constantly, because even a few minutes of modern smartphone video (often recorded in 4K) can easily exceed 500MB.
Steps to get a video submission-ready:
- Trim first. Most submissions don’t need the raw, unedited clip — cut dead air, false starts, and setup time before you worry about file size at all. A 6-minute raw clip trimmed to 3 minutes of actual content is already half the size before any compression.
- Open AllMediaTools Video Compressor and upload the trimmed file.
- Choose a lower resolution if the platform allows it — 1080p is usually more than enough for a class submission; 4K is rarely necessary and is the single biggest driver of oversized files.
- Download the compressed file and check that it plays back cleanly before submitting.
Rough size expectations: a 3-minute 4K clip can run 300-600MB uncompressed. Compressed to 1080p at a reasonable bitrate, the same content often lands in the 30-80MB range — comfortably under most classroom portal limits, and small enough to email if needed as a backup submission method.
If you want the full breakdown of resolution, bitrate, and format choices (and how much quality you actually keep at each step), see compressing video without losing quality.
Shrinking PDF Scans and Worksheets
PDF scans are the trickiest of the three, because a “PDF” is often really just a wrapper around several full-resolution photos — a stack of scanned worksheet pages can add up to a surprisingly large file even though each individual page looks like plain black-and-white text.
AllMediaTools doesn’t currently have an in-house PDF compression tool, so for this one, the practical path is:
- If you’re the one creating the PDF (scanning app, phone scanner, printer scan-to-PDF), check the scanning app’s settings first — most scanning apps (including your phone’s built-in one) let you choose a lower scan resolution or a “text/document” mode instead of “photo” mode, which produces a dramatically smaller file at the source, before you even need to compress anything afterward.
- If you’ve already got an oversized PDF, our guide on how to reduce a PDF’s file size walks through free browser-based tools that handle this without installing desktop software.
- As a fallback for a scanned worksheet specifically, converting the pages to individual images, compressing those with AllMediaTools Image Compressor, and re-assembling into a PDF with a free online PDF-maker tool works well when a direct PDF compressor struggles with a particular file.
Common cause of “my PDF scan won’t upload”: scanning multiple pages in full-color “photo” mode when the content is plain text or line drawings. Switching to black-and-white or grayscale “document” mode alone often cuts file size by 70-90% with zero loss of readability.
Quick-Reference: Common Upload Limits (As of 2025)
Platforms change their limits over time, so treat these as helpful approximations rather than guarantees — always check the specific platform’s current help documentation if a submission is right at the edge.
| Platform | Approximate limit (as of 2025) | Notes |
|---|---|---|
| Google Classroom | ~5GB per file (Google Drive-backed) | Generous for most assignments, but slow uploads on poor Wi-Fi are still common with large video files |
| Canvas | Varies by institution, commonly 500MB-1GB | Set by the school’s Canvas admin, not a fixed platform-wide number — check your course syllabus or ask your instructor if unsure |
| Gmail attachments | 25MB per email | Files larger than this need a cloud link (Google Drive, etc.) instead of a direct attachment |
| Common App | 10MB per document upload (essays, supplements) | Applies mainly to PDF/document uploads, not the platform’s video/arts supplement uploads, which have separate limits |
If you’re ever right at the edge of a limit, compressing to roughly 60-70% of the stated maximum leaves useful headroom — uploads can fail unpredictably close to a hard cap even when the file is technically under it.
Frequently Asked Questions
What’s Google Classroom’s file size limit?
Google Classroom uses Google Drive for file storage, and the practical limit is generally around 5GB per file as of 2025 — generous for nearly all coursework. The more common real-world issue isn’t the size cap itself but slow upload speeds on school or home Wi-Fi when submitting large, uncompressed video files.
Why won’t my PDF scan upload?
The most frequent cause is a scanning app set to full-color “photo” mode for what is actually plain text or line-drawing content, producing a much larger file than necessary. Switching your scanning app to grayscale or “document” mode, or compressing the existing PDF, usually resolves it.
Does compressing hurt image quality for grading/printing?
For on-screen reading and standard grading purposes, compressing to around 75-85% quality is visually indistinguishable from the original in virtually all cases. If a photo or image needs to be printed at large size or reviewed for fine artistic detail (art class portfolios, for example), keep quality higher (85-95%) or check with your instructor about their preferred format before compressing aggressively.
What’s the fastest way to shrink a video for a class project?
Trim unnecessary footage first, drop the resolution to 1080p if you recorded in 4K, then run it through a free online compressor like AllMediaTools Video Compressor. Trimming and lowering resolution typically account for more of the size reduction than the compression step itself, so do those first.