MillFile

Compress PDF to 300 KB

Application portals ask for PDF up to 300 KB all over the web - recruitment, admissions, visas, tenders. This page compresses your PDF to fit under 300 KB in seconds. Free, unlimited, no sign-up, no watermark, and the file never leaves your device.

Target size:

Selected: 300 KB

Other targets: 100 KB200 KB500 KB1 MB2 MB

Why so many forms cap at 300 KB

Three hundred kilobytes is one of the most common document limits online. Government recruitment forms, university applications, tender submissions and professional registration systems set it to keep their storage light, and they reject anything heavier with a single line of error text - no guidance, no second chance.

Print-ready PDFs embed full-resolution images and whole fonts, so they reach one or two megabytes before you notice. MillFile gets yours under the line without sending it anywhere: a lossless rebuild handles text documents in seconds, and scanned pages are re-rendered in small steps until they fit. What you download keeps the highest quality that still fits under 300 KB.

Free and unlimited. No account, no watermark, no daily cap — and the file is processed on your device, never on a server.

Questions about compressing to 300 KB

How do I compress a PDF to 300 KB?

The 300 KB target is pre-selected on this page - drop your file and download it once the badge turns green. A typical document takes a few seconds from drop to download.

Why is my PDF too big for the upload form?

Portals cap file size at a fixed number, while scanners and Word export far above it. The form is not broken and your document is not wrong - it simply has not been compressed to the stated cap yet.

Is it safe for confidential documents?

Yes. Compression happens in your browser and the file is never uploaded. You can disconnect from the internet after the page loads and it still works.

What if the file cannot reach 300 KB?

Very dense scans have a floor. When a document cannot fit, the badge shows the smallest size achieved so you know what you can upload, or what to re-scan at a lower resolution.

How small can a scanned PDF actually get?

By the page, not by the target. A text page repacks to a few kilobytes, while a busy photo page keeps a floor - the smallest image your browser can make of it. When several heavy pages add up above 300 KB, the badge reports that minimum instead of pretending the target was met.

Can I compress a PDF to 300 KB on my phone?

Yes. Mobile Safari and Chrome run this page exactly as a desktop browser does: tap the box, choose the file from Files or Downloads, wait for the badge. The difference is time, since every page is rendered on the handset itself.

Are hyperlinks kept when a PDF is compressed to 300 KB?

A lossless rebuild leaves page content as it is, links included. Once a page is re-rendered it is a picture, and the links, form fields and signatures on it go with it; the bookmark outline and stored document title are not carried into the new file either. If a submission needs a working link, open the compressed copy and click it.

Will a 300 KB scan meet a minimum resolution rule?

Some forms state a size cap and a resolution floor at once, and the two can conflict. Re-rendered pages land between roughly 45 and 144 dots per inch, so read which number the portal really enforces and pick the largest target that satisfies it. Page dimensions stay exactly as they were.