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FAQ
How does the comparison work?
PDFGem renders each page of both documents as images and performs a pixel-by-pixel comparison. Differences are highlighted in red.
Can I compare PDFs with different page counts?
Yes. Pages are compared in order. Extra pages in the longer document are shown as 100% different.
What do the view modes show?
Side by Side shows both pages next to each other. Overlay blends them to reveal shifts. Differences highlights only the changed pixels in red.
Can I compare text content instead of pixels?
Currently PDFGem compares visual rendering (pixel diff). This catches all changes including formatting, images, and layout — not just text.
Is there a page or file size limit?
Each file can be up to 100 MB. Very large documents may take longer to render and compare.