Under 500 KB, and photos still look close to the original.
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How to compress PDF to 500 KB
1Drop your PDF.
2Press "Compress to 500 KB". We find the best quality that fits.
3Download. The size is checked and shown before you upload it anywhere.
What fits under 500 KB: our tests
We ran this page on five everyday documents and kept every file it gave back. "Fits" means it came out at or under 500 KB, counted as 500,000 bytes.
Document
Before
After
How it looks
Certificate, 1 page, phone photo
1.9 MB
440 KB ✓
Close to the original
Letter and statement, 3 pages, phone photos
5.6 MB
471 KB ✓
Sharp
Certificate, 1 page, colour scan at 300 DPI
1.1 MB
446 KB ✓
Close to the original
Bank statement, 5 pages, colour scan at 200 DPI
2.8 MB
471 KB ✓
Clear
Report from Word, 4 pages, a photo on each
1.3 MB
477 KB ✓
Text sharp, photos clear
Tested 22 October 2026 in Chrome on a MacBook (Apple M3); each file took 0.3 to 1.3 seconds. When a file can't fit, the page gives you the smallest version that's still readable and says so. How we test
At 500 KB, most documents still look like the original
This is the size where compressing stops being a trade. In our tests:
a one-page certificate, photographed with a phone, came out at 440 KB at about 210 DPI, close to the 1.9 MB original at normal zoom;
three phone-photo pages went from 5.6 MB to 471 KB and stayed sharp, at about 140 DPI;
a five-page bank statement scanned in colour came out at 471 KB, clear at 100 DPI;
a four-page Word report kept its text exactly as it was, with its photos clear.
So under 500 KB, one to three scanned pages look close to the original, and five still read cleanly.
Why not press Balanced and be done?
You can, but for a short document you’d lose detail you didn’t need to lose. Balanced always aims at about 150 DPI, so the same one-page certificate would come out around 165 KB. With Exact size set to 500 KB, the same page keeps around 210 DPI, because we use the room the form gives you.
That’s also why the result is rarely 499 KB. We step through set quality levels, and the next step up would have gone over the limit. 440 KB means the sharpest step that fits came in at 440.
Where 500 KB limits show up
Limits around 500 KB turn up on university and job portals, visa forms and HR onboarding systems, usually per document.
When a form asks for several documents as one file, merge them first and compress the result here once. Three scanned pages fit under 500 KB in our tests and stayed sharp.
Longer documents
Past about five scanned pages, 500 KB starts to cost sharpness again. A ten-page scan gets about 50 KB a page, which reads fine with small print a little soft. If the form allows a bigger file, the 1 MB page gives a long scan room to stay clear. If it doesn’t, Split PDF by size makes parts under 500 KB, numbered in order.
Text and drawings stay exactly as sharp as before, because we only re-encode the photos and scans inside the file. "Balanced" keeps photos clear on screen and in print at normal sizes. If you need it sharper, choose "Light".
How do I get my PDF under a size limit, like 200 KB?
Pick "Exact size" and type the limit. We try quality settings until the file fits, then keep the sharpest version that is still under your limit. If the limit is too small to keep the file readable, we tell you and give you the smallest readable version.
Is PocketPDFs free?
Yes. Every tool that runs on your device is free and unlimited, with no sign-up, no watermark and no daily cap. There are no ads.
Is my file uploaded anywhere?
No. Compress PDF to 500 KB runs inside your browser, on your device. Your file never reaches our servers, so it stays private and there is no upload to wait for.
Do I need to install anything?
No. It works in any modern browser on phone, tablet or computer. No app, extension or account needed.