PDF Page Size Checker
Instantly report the exact width and height of every page in your PDF - in millimetres, inches, and PDF points. The tool automatically identifies standard paper sizes (A4, A3, Letter, Legal, and more), detects page orientation, and flags mixed-size documents. All processing runs locally in your browser with zero server uploads and no signup required.
Upload a PDF to check its page dimensions
Why Use Our PDF Page Size Checker?
Exact Dimensions in Three Units
The PDF page size checker reports every page's width and height in millimetres, inches, and PDF points simultaneously - so you always have the exact dimension in the unit your workflow requires, whether print, design, or development.
Secure PDF Page Size Check Online
Your PDF never leaves your device when you check PDF page size online. 100% client-side processing in your browser ensures complete privacy for confidential documents, contracts, and sensitive business files.
Instant Results for Every Page
Get the page size report for every single page in your PDF instantly - no waiting, no server queue. The PDF page size checker processes the entire document in one pass and displays orientation, paper name, and dimensions for all pages simultaneously.
PDF Page Size Checker - No Installation
Check PDF page size directly in your browser on any device. No software downloads, no plugins, no account required. Works on desktop and mobile - 100% free with no file size limits and no watermarks added to your document.
When to Check PDF Page Size
Print Production Preflight
Before sending a PDF to a commercial print house, use the PDF page size checker to confirm every page is the correct size (A4, A3, Letter, etc.) and that no pages have accidentally been left at the wrong dimensions from your layout application.
Design File Verification
Graphic designers routinely export PDFs from InDesign, Illustrator, and Figma. Check PDF page size to verify that artboard dimensions exported correctly, that bleed areas are included, and that no pages are incorrectly scaled compared to the original design.
PDF Generation QA & Testing
Developers building PDF generation pipelines - using wkhtmltopdf, Puppeteer, reportlab, or similar tools - use the PDF page size checker to validate that generated documents match the expected paper size specification before shipping to production.
Document Compliance Checks
Many government submission portals and regulatory systems require documents to be a specific page size (usually A4 or US Letter). Use the PDF page size checker to confirm compliance before upload and avoid rejection due to incorrect page dimensions.
Mixed-Size Document Detection
When merging multiple PDFs from different sources, the resulting document may contain pages of varying sizes. The PDF page size checker instantly identifies mixed-size documents and shows exactly which pages differ, so you can fix them before distribution.
Custom Paper Size Identification
PDFs created from CAD drawings, technical schematics, blueprints, and engineering documents often use non-standard paper sizes. The PDF page size checker reports exact dimensions in mm and inches for custom-size pages, making it easy to identify the correct media for reprinting.
Understanding PDF Page Sizes
What is a PDF Page Size Checker?
A PDF page size checker reads the MediaBox values stored in each page of a PDF file and converts those coordinates into human-readable dimensions. PDF dimensions are stored internally in PDF points (1 pt = 1/72 inch), so a standard A4 page is 595 × 842 pt, a US Letter page is 612 × 792 pt, and an A3 page is 842 × 1191 pt. The PDF page size checker converts these point values to millimetres and inches and cross-references them against the full ISO and ANSI paper size catalogue so you immediately know whether a page is A4, Letter, Legal, or a custom size - without needing to calculate anything manually.
How Our PDF Page Size Checker Works
- Upload Your PDF: Drop any PDF into the upload zone. The PDF page size checker accepts documents of any page count and size - from single-page invoices to multi-hundred-page technical manuals.
- Automatic Dimension Extraction:The tool reads each page in the PDF using your browser's client-side processing engine. For every page it extracts the width and height in PDF points, factors in any page rotation stored in the PDF, then converts to millimetres and inches. Your PDF never leaves your device.
- Results Displayed Instantly: The PDF page size checker shows a summary (total pages, unique sizes, most common size) plus a full page-by-page table with paper name, orientation badge, and dimensions in all three units. Copy the full report to clipboard with one click.
Paper Size Standards Detected
- ISO A Series (A0-A6): The global standard used across Europe, Asia, and most of the world. A4 (210 × 297 mm) is the most common PDF page size worldwide.
- ISO B Series (B4, B5): Used for books, envelopes, and Japanese printing. B5 (176 × 250 mm) is common for academic journals and notebooks.
- North American ANSI (Letter, Legal, Tabloid): US Letter (8.5 × 11 in) and US Legal (8.5 × 14 in) are the standard sizes for North American business documents, contracts, and legal filings.
- Custom Sizes:Pages that do not match any standard are labelled "Custom" and their exact dimensions in mm, inches, and points are reported - useful for CAD drawings, posters, banners, and custom-format publications.
Privacy, Rotation & Accuracy
The PDF page size checker runs entirely in your browser - no server uploads, no data transmission, no file storage. All processing is local and private. The tool correctly handles page rotation metadata stored in the PDF: if a page has a 90° or 270° rotation flag, the reported width and height reflect the visual orientation (landscape vs portrait) rather than the raw stored coordinates. For PDFs with CropBox or TrimBox values that differ from MediaBox, the tool reads the rendered viewport to ensure reported dimensions match what you actually see.
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Frequently Asked Questions About PDF Page Size Checker
A PDF page size checker reads the MediaBox coordinates stored in each page of a PDF and converts them from PDF points to millimetres and inches. It also identifies standard paper sizes (A4, Letter, Legal, A3, etc.) automatically and reports the orientation (portrait or landscape) of each page. Our tool processes the full document and shows a page-by-page breakdown alongside a summary.
PDF dimensions are stored internally in PDF points, where 1 point = 1/72 inch. An A4 page is 595 × 842 points, a US Letter page is 612 × 792 points, and an A3 page is 842 × 1191 points. Our PDF page size checker automatically converts these to millimetres and inches so you can work in whichever unit your workflow requires.
Yes, completely. The PDF page size checker runs entirely client-side in your browser. Your PDF file is never uploaded to any server, never stored, and never transmitted over the network. This makes it safe for checking confidential contracts, legal documents, financial reports, and other sensitive PDFs.
Yes. The PDF page size checker is 100% free with no signup, no premium tier, no file size limits, and no watermarks. You can check as many PDF files as you like without any restrictions.
Yes. The PDF page size checker checks every individual page independently and reports each page's dimensions separately. If your PDF contains mixed sizes - for example, if some pages are A4 and others are A3 - the tool flags this in the summary (showing "All Same Size: No") and lists the exact dimensions for every page in the table.
Yes. PDFs can store a rotation flag (0°, 90°, 180°, or 270°) independently of the content. The PDF page size checker reads this rotation metadata and reports the visual dimensions - so a landscape A4 page (rotated 90°) correctly shows as 297 × 210 mm rather than reporting the stored portrait coordinates. Rotation is also shown in the table when non-zero.
The PDF page size checker recognises ISO A-series (A0-A6), ISO B-series (B4, B5), North American sizes (Letter, Legal, Tabloid/Ledger, Half Letter, Executive), JIS B-series (JIS B4, JIS B5), and Government Letter. Pages that don't match any standard within a 3-point tolerance are labelled "Custom" and their exact dimensions in mm, inches, and points are reported.
Yes. Click the "Copy Report" button in the summary card to copy the full page-by-page dimension report to your clipboard as plain text. The report includes the paper name, orientation, and all three unit values (mm, inches, and points) for every page - ready to paste into a spreadsheet, email, or issue tracker.
Yes. The page-by-page table shows width and height in all three units: millimetres, inches, and PDF points. On larger screens, all three are visible simultaneously. On mobile, points are hidden to keep the table readable but are included when you copy the full report to clipboard.