PDF Page Size and Drawing Sheet Checker
Check the page size of every page in a PDF in millimetres, see which sheets match A0 to A6, and spot a page that is cropped, rotated or a different size.
Tool workspace
Nothing is uploaded. Files are read in this tab and stay on your machine.
Check the size of every page
How do I check the page size of a PDF?
Select one PDF. The document structure is read in this tab; no page is rendered.
Read the per-page table for visible size, which box that size came from, the raw MediaBox and CropBox, rotation and UserUnit.
Read the line above the table: it says whether every page is the same size. The completeness line below the file name applies only to the image counts in the last column.
How does the PDF page size checker measure a page?
This PDF page size checker reads the size of every page in a PDF, in millimetres, as a reader displays it, and says whether it matches an A-series sheet (A0 to A6). Each row also shows the raw MediaBox (the sheet the page was defined on), the CropBox (the part a reader shows), the page rotation and any UserUnit (a scale factor very large drawings use), without claiming what the drawing was issued at.
A PDF page carries several rectangles. MediaBox is the sheet the page was defined on; CropBox, when present, is the region a reader actually displays (the part of it inside the MediaBox). This tool reads both directly from the page dictionary and names which one the visible size came from, rather than reporting a single effective box. UserUnit multiplies the page into its physical size and is applied before any comparison. Page rotation is applied so a page is measured as it is displayed, not as it is stored. Once every sheet in a set measures as it should, the set can be reviewed in Xenmark, which offers PDF markup and structured drawing review in the browser.
How Xenmark makes it easy to check the page size of a PDF
Every page measured in millimetres
Each page is measured as a reader displays it, with its rotation and UserUnit applied, and the width and height are given in millimetres.
Nothing leaves your machine
Nothing is uploaded. Files are read in this tab and processed in memory, with no account and no server for them to go to.
Says which box the size came from
Each row states whether the visible size came from the CropBox, the MediaBox or no declared box, which helps tell a cropped page from a resized one.
A0 to A6 matched within half a millimetre
Every page is compared with A0 to A6 in both orientations. A page that matches none is shown as matching none, not as a fault.
Mixed sheet sizes spotted at once
One line says whether every measurable page is the same size, to within half a millimetre, before you read the table row by row.
Nothing to install
It runs in the browser you already have. There is no plug-in, no desktop application and no sign-up to get through first.
Limitations
What this tool does not do, stated up front.
A dimensional match states only that the page measures the same as a common size. It is not a claim about the format the drawing was issued at, the scale it was drawn to, or whether it has been resized since.
A page that matches no A-series size (A0 to A6) within half a millimetre is reported as matching none. US Letter, ANSI and ARCH sheets are measured correctly but match none.
Encrypted documents, including ones that open without a password, are refused rather than partly read, and so are files over 64 MiB.
Questions
What size is my PDF in millimetres?
The table gives the page size of every page, width and height in millimetres, as a PDF reader displays it, with rotation and UserUnit applied. The MediaBox and CropBox columns show the two rectangles behind that size, because they can disagree.
Can this tell me the original paper size?
No, and it deliberately does not try. It reports the dimensions the page declares now. A page may have been scaled, cropped or re-exported since it was issued.
Why does one page print smaller than the others?
Usually because that page is a different size or has been cropped. The table shows each page's size and whether it came from the CropBox or the MediaBox, so a cropped page can be told from a resized one.
Why did Xenmark build a free page size checker?
Xenmark AS is a Norwegian software company building browser-based drawing review tools for owners, consultants, operators and other teams that receive and review technical drawings. Those teams handle PDFs every day, and not every file should be sent to a website just to merge, split or check it — a tender document, a client’s drawing set, a revision that is not released yet. So these everyday tools are free and run entirely in your browser: no account, no upload step, and no server ever receives the file. You can check that yourself — open your browser’s network tab, measure a drawing set, and watch nothing leave. What this tool cannot do is listed under Limitations above.
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Reviewing the drawings, not just handling the files?
Xenmark is affordable PDF markup and structured drawing review in the browser. Invite reviewers, pin numbered comments on the sheet, track every one by author and status, and export a clean PDF and Excel when the review is done. Unlike these tools, a review is shared, so its drawings are uploaded to your Xenmark project.
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