How to Compress a PDF to a Specific Size

Some upload forms are unforgiving. A job portal wants your CV under 200 KB. A visa or passport site caps documents at 1 MB. A government form refuses anything over 100 KB. Unlike a casual email attachment, here you are not just making the file “smaller” — you need it to land under a specific number. This guide is about hitting a target size, why it takes a little trial and error, and what to do when a PDF simply refuses to get small enough.

Why you can't just type “200 KB” and get 200 KB

It is the first thing people expect, and no honest tool can promise it. Compression does not have a dial marked in kilobytes. It works by re-encoding the imagesinside the PDF at a chosen quality level — and how many kilobytes that saves depends entirely on what is in your file. Ten sharp phone photos behave very differently from a two-page text contract. So the reliable method is not “set the size” but pick a quality level, check the result, and step down if you are still over the limit. With one or two passes you can get comfortably under almost any target.

The method: compress, check, step down

1. Open the tool. Go to Compress PDF and drop your file in.
2. Start at Ebook.It is the balanced default and clears most 1 MB and 2 MB limits in a single pass.
3. Download and check the size. If it is already under your target, you are done.
4. Still too big? Re-run at Screen.This is the most aggressive level and is what gets a file down toward 100–200 KB.
5. Still over? Use the extra tricks below before you sacrifice any more quality.

Which quality level for which target

Treat this as a starting point, not a guarantee — the actual result depends on how image-heavy your PDF is:

• Target 1–2 MB → Ebook almost always does it in one pass, and the result looks identical to most eyes.
• Target 500 KB → try Ebook first; drop to Screen if a scan or photos push you over.
• Target 100–200 KB → go straight to Screen. This is a tight budget, so also apply the tricks below.

When Screen still isn't enough

If even the most aggressive level leaves you over the limit, the size is coming from something compression alone can't fix. Try these, roughly in order of impact:

• Convert to grayscale.If the document does not need colour — most scanned forms and contracts don't — PDF to Grayscale throws away all the colour data and can halve a colour scan on its own. Do this, then compress.
• Remove pages you don't need to submit. A blank back page or an instructions sheet is pure weight. Use Split PDF to keep only the pages that matter.
• Split one big PDF into parts.If the form accepts multiple files, a 10 MB scan split into three parts may put each comfortably under a per-file cap.

A realistic word about scans

The hardest case is a photographed or scanned document — a passport page shot on a phone, say. It is essentially a large photo, so it fights every size cap. The winning combination is almost always grayscale first, then Screen-level compression. If you scanned at 600 DPI “to be safe”, that is the real problem: 200–300 DPI is plenty for a document that will only ever be viewed on a screen, and it is a fraction of the size.

Common size targets, at a glance

• 100 KB — Screen level + grayscale, and expect to trim pages. Tight but usually reachable for a 1–3 page document.
• 200 KB — the classic job-portal limit. Screen level clears it for most text-based CVs and forms.
• 500 KB — comfortable for most documents at Ebook or Screen.
• 1 MB / 2 MB — Ebook in a single pass, quality untouched.

Is it private and free?

Compression runs on professional PDF software on our secure server. Your file travels over an encrypted HTTPS connection, is processed in an isolated workspace, and is deleted automatically the moment the smaller PDF is returned — nothing is stored, logged or shared. It is free, with no watermark and no sign-up, so you can run as many passes as it takes to get under your limit.

Frequently asked questions

Will the text get blurry at Screen level? No — the text layer is left alone and stays sharp and selectable. Only the images are re-encoded, and at document sizes that rarely shows.

My PDF barely shrank even at Screen. Why? It is already almost pure text, so there is little to remove. In that case the extra weight is usually a few embedded fonts or pages — trim what you can rather than compressing harder.

Can I merge several files and still stay under the limit? Yes — Merge PDF first, then compress the combined file so the whole submission fits one upload.

Get your PDF under the limit

Open Compress PDF, start at Ebook, and step down to Screen if you need to — with grayscale and page-trimming in reserve for the tightest 100 KB targets. For the wider picture of what makes PDFs heavy, see how to compress a PDF.