MillFile

Compress PDF to an Exact Size

Free, unlimited, no sign-up - your files never leave this device

Upload forms everywhere enforce fixed PDF limits: 100 KB for ID scans, 300 KB for applications, 1 MB for attachments. MillFile rebuilds your document to fit the exact limit you choose. Everything runs in this browser tab - no account, no watermark, and no server ever sees your file.

Target size:

Selected: 300 KB

Files never uploaded. Compression runs in this tab — drop a document, download the result. Works for confidential scans and IDs.

How it works

  1. Choose your targetPick the size the form demands, from 100 KB to 2 MB. Every common target has its own page with a direct link you can bookmark or share.
  2. Drop your PDFFiles are read straight from your device. A lossless rebuild runs first; if the result is still too big, pages are reduced in small steps until they fit the target.
  3. Download and uploadThe badge shows the final size and how much was saved. Download one file or take the whole batch as a zip, then upload with confidence.

Common targets: 100 KB200 KB300 KB500 KB1 MB2 MB

Frequently asked questions

What is MillFile?

A browser tool that compresses a PDF to a precise size limit - 100 KB, 300 KB, 1 MB or anything between. It is free, needs no account, and never uploads your files.

Why do websites reject my PDF?

They cap file size, commonly somewhere between 100 KB and 1 MB, while scanners and Word export well above those numbers. Compressing to the stated cap is the whole fix.

Is there a file size or usage limit?

There is no account, no watermark and no daily quota. Larger files simply take longer, because pages are rendered one at a time on your own device.

How is this different from online converters?

Most converters upload your document to a server, then queue you or charge for higher limits. MillFile works entirely on your device, which keeps confidential documents confidential and keeps the price at zero.

Can I compress a PDF to 50 KB or 10 KB?

The smallest target you can pick here is 100 KB, so a 50 KB form cannot be answered directly. Every document also has a floor: when a file will not fit, the badge reports the smallest size actually reached instead of guessing. To get under 100 KB the source has to shrink first - scan at a lower resolution, drop blank pages, keep one page per file.

How do I compress a PDF on an iPhone or in Chrome?

Open the tool in Chrome on Windows, Mac, Linux or Android and click the box to choose a file. On an iPhone or iPad the same tap opens the Files app, where camera scans and mail attachments live, and the finished PDF is saved back there. Neither path uploads anything. A long document takes longer on a phone, because pages are rendered one at a time.

Are links, bookmarks and form fields preserved?

When the lossless rebuild is enough, pages keep their text, fonts and clickable links. Pages that must be re-rendered become pictures, and the links, fillable fields and signatures on them are gone. Either way the bookmark outline and the stored document title do not carry into the new file. If a submission needs a live form, send the original.