How to Compress a PDF to a Specific Size (like 200 KB)

Upload forms love to spring this on you: “Maximum file size: 200 KB.” Your scanned document is 3 MB, the form won’t budge, and you just need it under a specific number. Government portals, job applications, visa sites and exam registrations are notorious for tight caps like 200 KB, 500 KB or 2 MB. Here’s how to compress a PDF to hit a size target — right in your browser, with the file never leaving your device.

The honest truth about “compress to exactly 200 KB”

Plenty of sites advertise a magic “target size” box: type 200 KB, get 200 KB. Under the hood they’re just guessing quality settings and re-running until they land close — and they do it on their server, with your file uploaded.

You can do the same thing yourself, locally, in a few seconds. The two knobs that actually control a PDF’s size are:

Quality — the JPEG quality of the images/pages (lower = smaller file, more visible compression).
DPI — how many dots-per-inch each page is rendered at (lower = fewer pixels = smaller file).

Our PDF Compress tool rasterises each page to a JPEG at your chosen quality and DPI, then shows you the resulting size in KB. So the workflow is simple: pick settings, check the number, nudge it, done. Usually one or two tries.

Step by step: get under your target

Open the PDF tools and choose Compress.
Drop your PDF in. Nothing is uploaded — it’s processed on your device.
Start with a sensible guess for your target (see the table below).
Run it. The result shows its new size in KB.
Too big? Lower the DPI first (it has the biggest effect), then quality. Too aggressive? Nudge them back up. Re-run until you’re comfortably under the cap.

Because everything runs locally, re-running costs nothing but a second — iterate freely.

Starting points for common size caps

Sizes depend heavily on page count and how image-heavy the document is, so treat these as a first guess, then adjust:

Target size	Try DPI	Try quality	Good for
~100 KB	90	40	1–2 page form, ID scan
~200 KB	110	50	1–3 page scanned document
~500 KB	130	60	Multi-page scan, still readable
~1–2 MB	150	70	Longer document, better clarity

Rule of thumb: halving the DPI cuts the file to roughly a quarter (it’s area, so it scales with the square). Quality is a gentler, finer adjustment. If you’re way over, drop DPI; if you’re just slightly over, drop quality by 5–10.

The one trade-off to know

This kind of compression rasterises each page — it turns the page into an image. That means:

Text is no longer selectable or searchable in the result (it’s now part of a picture).
It’s ideal for scans, forms and image-heavy PDFs, where the page was basically an image already.
For a text document you want to keep selectable, hitting a tiny target this way will look soft. If size matters more than selectable text (which is usually the case for an upload form), that’s a fair trade.

If you need selectable text and a smaller file, try removing unused pages first (Split) or reducing the source scan’s resolution before exporting to PDF.

Tips for hitting a tight cap

Fewer pages, smaller file. If the form only needs page 1, use Split to keep just that page — instantly a fraction of the size.
DPI is your big lever, quality is the fine-tune. Reach for DPI when you’re far off, quality when you’re close.
Don’t over-compress. Get under the cap with a little headroom, not as tiny as possible — 190 KB for a 200 KB limit keeps the document as readable as it can be.
Grayscale scans are already smaller than colour; scan documents in grayscale when colour doesn’t matter.

Why do this in the browser?

The documents people need to shrink for upload forms are exactly the sensitive ones — passport scans, bank statements, signed contracts, medical forms. A server-side “compressor” means uploading that to a stranger’s machine. Our PDF tools run 100% in your browser: the file is read, compressed and saved locally, so there’s nothing to upload, cache or leak — the same way our image and 3D tools work.

FAQ

Can it compress to an exact size automatically? There’s no auto-target box, but because the tool shows the result size in KB and re-runs instantly, you can dial in an exact target in one or two tries by adjusting DPI and quality.

How do I get a PDF under 200 KB? Start around DPI 110 and quality 50, run it, and check the KB. Lower the DPI if you’re still over, or nudge quality down if you’re just slightly over.

Will the text still be selectable after compressing? No. This method rasterises pages to images, so text becomes part of the picture. It’s best for scans and forms rather than documents you need to search or copy from.

Is my file uploaded anywhere? No. Compression happens locally in your browser — the PDF never leaves your device.

Can I compress several PDFs at once? Yes. The Compress tool accepts multiple files and downloads the results together as a .zip.

Need to hit a size limit right now? Open the PDF tools, choose Compress, and adjust DPI and quality until you’re under the cap — free, private, and no upload. Working with photos too? The image tools shrink those the same way.