PDF Page Size Checker
Read the dimensions of every page, in whichever unit you think in. Mixed sizes get flagged at the top, which is usually the thing you opened this to find out.
Runs entirely in your browser. Your files are never uploaded.
How to use PDF Page Size Checker
- 1Pick a PDF, or drag it onto the box above.
- 2The report appears straight away; nothing needs to be pressed.
- 3Switch between millimetres, centimetres, inches and points.
- 4Download the report as a text file if you need to send it on.
Why a document refuses to print properly
Most printing problems with a PDF come down to one of two things: the pages are not the size the printer expects, or they are not all the same size as each other. A document assembled from several sources commonly mixes A4 with US Letter, which is a five millimetre difference in width and nearly twenty in height. Readers scale it silently, printers do not, and the result is a document with inconsistent margins that nobody can explain.
A print shop asking what size your pages are is asking this question. The summary at the top answers it in one line.
Standard sizes, and the tolerance behind them
A-series, B-series and the common US sizes are recognised and named. Matching is deliberately not exact: a document exported by a word processor can sit a fraction of a millimetre off A4, and scanners routinely produce something one or two millimetres from the paper they scanned. Demanding exact numbers would report nearly every real document as non-standard, which tells you nothing.
So anything within two millimetres is named, and anything further out is reported as non-standard along with how far from the nearest standard it falls. That number is often the useful part: 15mm off A4 is a deliberate custom size, 3mm off is a scanner.
Rotation, and why the report accounts for it
A PDF page carries a rotation value separately from its dimensions. A page stored as portrait but marked rotated 90 degrees is displayed and printed as landscape, which means a document can look entirely landscape while its stored sizes all say portrait.
Sizes here are the ones a reader shows, with rotation applied, and the rotation is marked beside the page number where there is any. A report that ignored this would tell you your document is portrait while every page of it comes out of the printer sideways.
Nothing is modified
This only reads. Your file is not changed, and nothing is produced except the text report, which you only get if you ask for it. If you need to make the pages consistent, that is a job for whatever produced the document rather than for a PDF tool: rebuilding on a single page size beats scaling pages afterwards.
Limits
- 100 MB per file.
- Password-protected PDFs need unlocking first.
- Reports the media box, which is the page size. Crop boxes and bleed are not shown.
- It reads sizes; it does not change them.
Frequently asked questions
- Why does it say A4 when the numbers are not exactly 210 by 297?
- Because real documents are rarely exact, and anything within two millimetres is named. The exact measured figures are in the table, so you can see how far off it is.
- My pages are all different sizes. Can this fix them?
- No, it only reports. Making them consistent is best done where the document was produced. Scaling pages after the fact tends to shift margins and soften text.
- What is a point?
- A 72nd of an inch, and the unit PDF uses internally. A4 is 595 by 842 points. Useful when you are setting margins in a tool that works in points.
- Does it check the crop box as well?
- No, it reports the media box, which is the page size as such. A document with a crop box smaller than its media box will display smaller than the figures here suggest.