Compress a PDF to a Specific Size: 100KB, 200KB, 300KB or 1MB
Short answer: you can't target a byte count with a PDF compressor, but you can step down its quality presets until you land under the cap. Try Medium (120 DPI) first. If the measured size still doesn't fit, drop to Low (96 DPI). If even that fails, delete pages you don't need and compress again. That's the whole playbook — and it fits government portals, visa uploads, job applications and university portals that demand "PDF under 200 KB" without any upload.
Step-by-step
- Drop the PDF into our PDF Compressor. It never leaves your browser — nothing is uploaded.
- Pick Medium (120 DPI). Most scans pass email, portal and application limits on the first pass.
- Check the measured size. The result row shows the real number before and after. Not an estimate — the real number. If it's under your cap, you're done: download it.
- If it's not under the cap, pick Low (96 DPI). The tool re-renders every page smaller and shows the new size. For noisy scans this reliably lands near 20% of the original.
- Still too big? Delete pages with our Extract PDF Pages tool, or split out the pages you need, then compress again. That's the honest finish line.
Real numbers from our own tool
Here is what the compressor does to a 5-page phone-photo scan of an invoice (a very realistic worst case — dense, noisy, handwritten-line-heavy):
| Preset | Resolution | Size result | Use for |
|---|---|---|---|
| High | 150 DPI | 2.71 MB → 2.37 MB | Fine print you must keep readable; usually not enough for a hard cap |
| Medium | 120 DPI | 2.72 MB → 1.09 MB | Most email attachments and portal uploads; also the first stop for a 1–2 MB cap |
| Low | 96 DPI | 2.72 MB → 541 KB | Hard caps (Visa, university portals, job systems); fine for text-heavy scans |
Every single one of those numbers came from running our own tool on a synthetic phone scan just now. Your mileage will vary — a flat text scan compresses better than this, a full-color photo catalogue worse. Compression is not a promise of a ratio; it's a promise of an honest before and after.
What size do you actually need?
Before you touch the compressor, know your target:
- Email attachments: most providers cap at 20–25 MB, but couriers like Gmail or Outlook re-encode some PDFs. Stay under 10 MB to be safe; under 5 MB to be comfortable.
- Portals (government, university, visa, job): the limits are usually written on the upload page — 200 KB, 500 KB, 1 MB — and are usually absolute, not "up to".
- ATS resumes: most systems accept 5 MB or less; 1–2 MB is the comfortable zone.
- E-signing services: usually 10–25 MB; compression is rarely the problem there.
FAQ
Can I compress a PDF to exactly 200 KB?
Not byte-for-byte — no compressor can hit an exact byte count. But you can get under the cap: try Medium, check the measured size, drop to Low if needed, and if you still miss, delete pages. You know you're under when the result row stops saying "too big" and starts saying the size you want.
Why did it say "no gain at this preset"?
The tool only hands you a smaller file when its rebuilt version is smaller than yours. If your PDF is already tight (or mostly vector text), re-rendering produces the same size and the tool hands back the original rather than a bigger file. Switch to a lower preset or delete pages instead.
Will the compressed file still open everywhere?
Yes. The output is an ordinary PDF with embedded JPEG pages. Every reader, portal and archival system that opens scanner output will open this too.
Is there a way to preserve searchable text?
Not with image-based scanning — scanning inherently rasterizes pages. If your PDF is digital text (created from Word or LaTeX), export to PDF from the source app with compression settings instead. Our compressor works on pages as images, which is why scans shrink and text PDFs barely move.
The portal rejects my file even though it fits.
Check the other rules: some systems cap pages, fonts and image resolution as well as file size. And some reject PDFs created by certain tools entirely. Try opening the PDF in a reader, printing to a new PDF, then compressing that version.
One honest closure: if you can't get under the cap no matter how hard you compress, your content is too heavy — delete pages, split the document, or resize the images inside it before you try to compress again. A compressor is not magic. It's math, applied locally, for free.
Next: see PDF Compressor, or if your cap is about pages rather than bytes, PDF Splitter and PDF Merger do the page surgery instead.