Free · runs in your browser · the PDF is never uploaded
Compress a PDF to 5 MB
Short answer
Drop your PDF into the compressor below. It’s pre-set to 4,882 KB so the file stays under 5 MB by either kilobyte definition. Most text documents and many multi-page scans fit with little or no quality loss. Use this when a course portal or client asks for “under 5 MB”.
What fits in 5 MB
- Comfortably: Most text PDFs unchanged, or a long scan of thirty-plus pages at good quality.
- At the limit: Very large photo-heavy bundles at lower DPI if needed.
5 MB is a common assignment and LMS limit, and a practical target when emailing a multi-page pack without hitting Gmail’s much larger 25 MB ceiling.
If Keep text already lands under 5 MB, stop there — Target size is only needed when the file is still oversized.
“Good quality” here means around 100 DPI, which looks sharp on a screen. These are rough guides, not promises: a page of plain text compresses far better than a colour photo, so check the preview.
How to compress a PDF to 5 MB
- 1
Drop your PDF into the compressor above, or tap it to choose a file. It’s already in Target size mode at 4882 KB.
- 2
Press Compress. A lossless rebuild runs first. If the file is still too big, the pages are re-rendered at lower resolutions, from 150 DPI down to 50 DPI, until it fits.
- 3
Check the preview of the first pages. Zoom in on the small print, such as dates, ID numbers and stamps, because that’s what blurs first.
- 4
Download the file and check its size on your device before uploading. On Windows, right-click and choose Properties; on a Mac, use Get Info. Compare the size in bytes with the limit.
- 5
Upload it. If the portal still says the file is too big, run the compressor again on the original with a slightly lower target.
Why the tool is set to 4882 KB, not 5 MB
Kilobytes are counted two ways. Some websites treat 1 KB as 1,000 bytes; others, and this compressor, treat it as 1,024. A file the compressor calls “5 MB” is 5,242,880 bytes, about 4.9% more than 5,000,000, and a strict portal will reject it.
4882 KB in the tool is 4,999,168 bytes, which is under 5 MB by either definition. You lose almost nothing in quality and avoid the most common “file too large” rejection.
If it won’t get down to 5 MB
The compressor stops at 50 DPI, because below that the text stops being readable. If even that pass is too big, you get the smallest readable file and a message saying so, instead of a file that technically fits but that nobody can read. These help:
- Try Keep text first on the main Compress PDF tool if you are not sure you need Target size.
- Split huge bundles with Split PDF when the portal allows multiple uploads.
- Remove blank pages before compressing so you do not burn the budget on empty sheets.
- Split the document if the portal has more than one upload field. Split PDF breaks it into parts you can compress separately.
Limits worth knowing
- Re-rendered pages become images with an invisible text layer. Search and copy keep working, but accented and non-Latin characters can be dropped from that layer.
- Large or image-heavy PDFs take a while, because each pass re-renders every page on your device.
- Password-protected PDFs have to be unlocked first.
- A portal can reject a file for reasons other than size, such as the file type or characters in the file name.
Frequently asked questions
How do I compress a PDF to under 5 MB?
Use this page. The compressor is pre-set just under 5 MB, tries a lossless pass first, then lowers resolution only if needed.Is 5 MB enough for email?
Yes for most personal email. Gmail’s advertised cap is 25 MB; 5 MB is a safer everyday target when you want a smaller attachment.Does this upload my assignment?
No. Compression runs entirely in your browser.
Guides for upload limits
- PDFs for government formsFrom phone photo to a PDF that passes the portal’s size limit, plus what you can and can’t hide.
- Exam application documentsMake a reusable “upload kit” of your certificates at the sizes exam forms ask for.
- Job and onboarding documentsPayslips, certificates, relieving letters and ID for HR portals, sized and checked.
- Visa application documentsUnlock bank statements, merge by category and get each file under the upload limit.
- PDF upload size limitsTypical caps for email and portals — and how to shrink toward them privately.
Written by Sumit · Last reviewed 12 Oct 2026