Use the free Count PDF Pages below: your PDF never leaves your browser — all work happens on your device, and nothing is uploaded to any server.
A simple question with a surprising number of answers
“How many pages is this PDF?” sounds like a one-number question. In practice, people also want to know the page size, whether all pages are the same size, and what the file actually contains. A document that mixes A4 and Letter pages prints badly. A file with one giant page hides a scanning mistake. A report that should be twenty pages but shows two hundred has a duplication problem. This tool answers the simple question and the useful follow-ups in one pass.
It is the kind of tool you reach for before printing, before submitting, and before sending a file to someone else. A quick check now prevents the embarrassment of a wrong page count in a submission, or a print job that comes out on the wrong paper.
What you get
Upload a PDF and the tool reports the total page count, the file size, and the document title and author when the file stores them. Then it lists every page with its width and height in points, and its size in millimetres. Points are the native unit of PDF pages — 72 points to an inch — and millimetres translate that into the paper sizes people recognise: A4 is 210 by 297 mm, Letter is 216 by 279 mm.
The per-page table is where the surprises live. Mixed sizes jump out at once. A single landscape page in a portrait document is obvious. A page that is twice the size of the rest usually means a scan went wrong or a poster slipped into the file.
Common uses
Students check page counts against assignment limits before submitting — a page over the limit can cost marks, and a page under can mean missing content. Offices check that a scanned file has the expected number of pages before archiving it; a missing page in an archive is a problem discovered far too late. Print shops check sizes before quoting a job, because mixed sizes change the price. Authors check that a manuscript exported correctly, with no blank or duplicated pages inflating the count.
It also helps when buying or selling documents. A seller who claims a guide has 150 pages can be checked in seconds, and a buyer can verify before paying.
Why page size matters
Page size decides how a document prints. A Letter document printed on A4 paper either shrinks or crops, depending on the printer setting. Neither is ideal. Knowing the sizes in advance lets you set the printer correctly, or convert the document first. It also matters for binding: a book with mixed page sizes binds badly and looks unprofessional.
If you find mixed sizes, the fix depends on the cause. Scanned pages can be re-scanned at the right size. Exported pages can be re-exported with a single paper setting. Merged documents can be rebuilt from sources with matching settings. The counter does not fix the problem, but it finds it in seconds, which is the hard part.
Privacy and speed
The file is read in your browser with pdf-lib. Nothing is uploaded, nothing is stored, and the result appears instantly for normal documents. Even a thousand-page file is only a quick read, because counting pages does not require rendering them.
Limits
The tool reports what the file declares: page count, page dimensions, and stored metadata. It does not check whether pages are blank, and it does not read the text. A page with nothing on it still counts as a page, because to a printer and to a submission system, it is one. If you need to find blank pages, that is a different check.
Metadata can also be missing or wrong. A file that stores no title simply shows no title, and a file with a stale title shows the stale one. The tool reports what is there; it does not guess.
Common questions
Does it work on very large PDFs? Yes. Counting pages is fast even for long documents.
Why is a page size in points and millimetres? Points are the PDF native unit; millimetres map to real paper sizes like A4 and Letter.
Is my file uploaded? No. Everything runs in your browser.