An applicant tracking system rejecting your resume with “file exceeds maximum size” is a specific kind of frustrating, because the limit is usually tighter than anyone expects — 2 MB, sometimes even less — while a resume with a decent-looking header photo or a scanned signature can easily be four or five times that.
A one-page CV should be a few hundred kilobytes. It balloons for a handful of predictable reasons: a profile photo pasted in at full camera resolution, since a phone photo can be 4–8 MB on its own and Word doesn’t automatically shrink it just because it’s displayed small on the page; a logo or letterhead copied from a PDF or webpage, often at a much higher resolution than the tiny space it occupies; a previous version’s images still in the file invisibly, from cropping, since Word keeps the full original behind a crop by default so a photo cropped down to a headshot still carries its uncropped original in the background; or the whole thing being a scanned document, if you’re uploading a signed cover letter or a certificate as a .docx built from a photographed page rather than typed text.
Fastest fix: compress it
The fastest fix is compression. Compress Word re-encodes every embedded image in the document to a sensible resolution and strips the invisible remnants left behind by cropping, while leaving your actual text, formatting, and layout completely untouched — nothing about how the document reads or looks changes, only the file size. Upload the .doc or .docx, download the smaller version, and re-upload it to the portal. For a résumé specifically, this usually solves the problem in one pass, since a profile photo or a logo is almost always the actual cause.
If it’s still too big, or the portal only wants PDF, that’s worth trying next regardless — many application systems explicitly want a PDF rather than a Word file anyway, since a PDF can’t shift formatting between the reviewer’s machine and yours. Word to PDF converts your (already-compressed, if needed) document into a PDF, and a PDF of the same visible content is typically smaller than the Word file that produced it, which also guarantees your careful formatting survives on the other end intact.
Before you resubmit
Double-check the portal’s stated limit, since some show it only in small print near the upload button, and knowing the actual number (2 MB vs 5 MB) tells you whether one compression pass is enough or whether you also need to convert to PDF. Re-check the file size after compressing, not just that it downloaded successfully — right-click → Properties (Windows) or Get Info (Mac) shows the exact number before you upload again. And if a scanned cover letter or reference letter is the culprit, Image to Word or Image to PDF built from a phone photo at a sensible resolution will always be smaller than pasting the photo directly into a Word document at full size.
While you’re fixing the upload, a couple of related things are worth a look: the portal may care about the extension as well as the size, since a system asking for .docx will reject an old .doc outright — DOC to DOCX fixes that in seconds, and DOC vs DOCX explains the difference. How to Submit Documents for a Job Application covers the rest of the packet: file naming, one file vs several, and what portals check. And if you only have your resume as a PDF, How to Convert a PDF Resume to an Editable Word Document covers going the other way.
Shrink it with the free Compress Word tool — nothing to sign up for, file discarded as soon as you download it.