Inspect PDF MediaBox and CropBox dimensions to catch mixed page sizes before print, merge, or upload.
- Runs locally
- Category PDF & Document
- Best for Checking file type, size, metadata, and obvious mismatch signals before sharing.
What this tool does
PDF Page Size Inspector reads page box declarations from a PDF and groups repeated MediaBox and CropBox dimensions into a CSV. It converts points into inches and millimeters, labels portrait versus landscape, and shows how many times each size appears. This is useful when a print vendor rejects a file for mixed A4 and Letter pages, when a scanned packet has one rotated page hidden in the middle, when merged contracts unexpectedly contain a cover sheet with different dimensions, or when a portal accepts only one page size. The tool does not render or upload the document; it inspects structural page box data directly in the browser.
Tool details
- Input
- Files + Text + Numbers
- The page exposes text boxes, numeric controls, file pickers, or structured inputs depending on the tool.
- Output
- Live result + Copy + Download
- The result area focuses on usable output, with copy, download, or preview actions when supported.
- Privacy
- Browser-side processing
- The main tool logic does not call an external API, so inputs normally stay in the current tab.
- Save / share
- No account required
- Open the page and use it; whether results survive refresh depends on the tool.
- Performance budget
- Initial JS <= 78 KB
- No WASM budget is declared, keeping the tool quick to open on mobile.
- Best fit
- PDF & Document · Operations
- Category and role tags drive related tools, internal links, and quick fit checks.
How to use
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1. Input
Paste or drop your content into the tool panel.
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2. Process
Click the button. All processing is local in your browser.
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3. Copy / Download
Copy the result or download to disk in one click.
How PDF Page Size Inspector fits into your work
Use it before upload, handoff, archive, support review, or any moment where a file needs one local check before it leaves your machine.
File jobs
- Checking file type, size, metadata, and obvious mismatch signals before sharing.
- Preparing mixed folders for upload, archive, intake, or review.
- Keeping sensitive files in the browser instead of sending them to an account-based service.
File checks
- Do not treat the extension alone as proof of the real file type.
- Review metadata before a file goes to customers, vendors, or a public page.
- Keep the original file until the copied, converted, or exported result is verified.
Good next steps
These links move the current task into a more complete workflow.
- 1 PDF Metadata Extractor Upload PDFs and extract document metadata, page-count hints, encryption flags, and producer details locally. Open
- 2 PDF Splitter PDF splitter — extract pages or split by range, every page becomes a PDF, 100% client-side with pdf-lib. Open
- 3 PDF Merger PDF merger — combine multiple PDFs into one, drag to reorder pages, 100% client-side with pdf-lib. Open
Real-world use cases
Preflight print PDFs
Find mixed page sizes before a printer rejects or scales a file incorrectly.
Check merged document packets
Inspect page boxes after merging several PDFs so one odd cover sheet does not slip through.
Common pitfalls
Looking only at the first page and assuming the rest of the PDF matches.
Confusing visible CropBox size with the physical MediaBox used by some print workflows.
Privacy
The PDF is scanned locally for box declarations. No page content is uploaded.
FAQ
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