Check page dimensions, detect standard sizes like A4 and Letter, and identify mixed page sizes in your PDF.
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This tool reads the geometry of each page and identifies whether it matches a known standard size such as A4, US Letter, or A3. It reports dimensions in millimetres, inches, and points, and detects the MediaBox, TrimBox, and CropBox values embedded in the file.
Printers and presses are set up for specific sheet sizes, so a file with the wrong page dimensions will be scaled, cropped, or rejected entirely. Knowing the exact size before sending avoids reprints and unexpected costs.
The MediaBox defines the full page area. The TrimBox defines the intended final size after trimming. The CropBox sets a visible region for on-screen display. For print, the TrimBox is usually the most important.
This can happen when content from multiple sources is combined into one PDF, or when pages are added from templates with different settings. Standardising page sizes before printing is recommended.
The tool reports the exact dimensions even for non-standard sizes. Share these measurements with your printer so they can confirm whether the file can be accommodated.
Use a PDF editor or imposition tool to resize pages to the correct dimensions. It is best to fix this at the source document level before exporting to PDF.
Custom sizes are fully supported. The tool reports the exact numeric dimensions regardless of whether they match a named standard, so you can verify any size your printer accepts.
Instantly count the pages in your PDF and see page orientation breakdown.
Convert between mm, cm, inches, points, and pixels with common print-size presets.
Verify whether your PDF includes the correct bleed area for professional printing.
Check whether content in your PDF maintains safe margins from the page and trim edges.
Learn before you print
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The Page Size Checker inspects every page of your PDF and reports its exact dimensions in millimeters, inches, and points. It identifies standard page sizes (A4, Letter, Legal, etc.), detects mixed page sizes across the document, and shows which page boxes (MediaBox, TrimBox, BleedBox, ArtBox) are present.
Professional printing equipment is configured for specific page sizes. If your PDF has pages of different sizes or non-standard dimensions, the printer may need to adjust settings between pages, increasing cost and turnaround time. Additionally, missing TrimBox or BleedBox definitions can lead to incorrect trimming, resulting in content being cut off or uneven borders in the final printed product.
