MillFile

Compress PDF to 100 KB

Passport scans, ID copies and certificates are routinely capped at 100 KB by application portals. Drop your PDF below and compress it to fit under 100 KB - free, unlimited, no sign-up, no watermark. The file is processed on this device and never uploaded.

Target size:

Selected: 300 KB

Other targets: 200 KB300 KB500 KB1 MB2 MB

Why upload forms demand 100 KB

A 100 KB ceiling shows up wherever identity documents are submitted: visa applications, government recruitment portals, university admission systems and scholarship forms. Exceed it by a few kilobytes and the upload button refuses the file, usually with a one-line error and no hint about what to do.

Scanned pages saved from a scanner or a phone app are typically 300 KB to 2 MB each, so the form loses before you start. MillFile rebuilds the document to fit under 100 KB: it first tries a lossless repack that keeps text sharp, then reduces page detail in small steps only as far as needed. Everything happens in your browser, so scans of your passport stay on your machine.

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 100 KB

How do I compress a PDF to 100 KB?

Keep the 100 KB target selected above, drop the file, and download it when the badge turns green. The page works down until the result fits under 100 KB, ready for the form that asked for it.

Will my scanned ID still be readable?

Yes, to the limit you chose. MillFile stops reducing as soon as the file fits - it never over-compresses past what you asked for, so the text stays as clear as 100 KB allows.

Is my document uploaded to a server?

No. The whole process runs inside this browser tab on your device. Your file is read from disk and written back for download without any network request.

Is there a cost or daily limit?

None. MillFile is free with no account, no watermark and no quota. Compress one document or fifty in the same session.

Can I compress a PDF to 50 KB or lower than 100 KB?

No - 100 KB is the smallest target selectable on this site. Set it anyway and read the badge: a document that cannot go smaller shows the minimum size actually reached, which is the floor of that file. For a 50 KB form the scan itself has to be lighter - lower resolution, grayscale, one page at a time.

How do I compress a PDF to 100 KB on an iPhone?

Open this page in Safari or Chrome on the iPhone and tap the drop box. The picker shows the Files app, where camera scans and mail attachments are kept, and the finished PDF is saved back to Files. The passport copy never leaves the phone, because there is no upload step to begin with.

Will a 100 KB scan pass a passport or visa upload rule?

It depends on which number the rule enforces. A rule that only caps file size is met exactly. A rule that also demands a minimum resolution may not be, because a re-rendered page lands between roughly 45 and 144 dots per inch - readable, but modest. When both numbers appear, choose the largest cap the rule allows.

Is the 100 KB limit per file or per application?

Check the wording, because MillFile answers per file: every document you drop is rebuilt to fit under 100 KB on its own. A portal that wants 100 KB for the whole application is a different job - combine the pages into one PDF first, then compress that.