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Upload the PDF, keep Layout Direction set to Vertical, and click the process button. Every page is placed top to bottom on one continuous page, with the output width matching the widest source page and narrower pages centered.

Choose Horizontal (Left to Right) in Layout Direction. Pages are laid out in order from left to right on a single wide page, and pages shorter than the tallest one are centered vertically.

Spacing (0 by default) adds a gap between pages, measured in the PDF's own units where 72 equals one inch, and Background Color fills that gap. Turn on Add Separator Lines to draw a line through the middle of each gap, with its own thickness (0.5 units and up, in steps of 0.5) and color.

It fills the whole output page underneath the source pages, so it shows in the spacing between pages and in any margin where a narrower page is centered. With white selected, the default, no fill is drawn at all.

No. Each source page is rendered to an image at 2x resolution and drawn onto the new page, so the result is a picture of your pages rather than live text. Keep the original PDF if you need to copy or search text later.

The tool doesn't set one, but the output grows with every page you add: a 100-page document becomes a page roughly 100 pages tall. Some readers struggle with very large pages; Adobe Reader, for example, doesn't display pages larger than 200 inches on a side.

It suits scrolling previews for the web, design mockups, comic strips, and storyboards where the reader scrolls instead of flipping pages. If you want several pages printed on one sheet in a grid, N-Up PDF is the better fit.

No. Rendering the pages and building the new single-page PDF both happen in your browser, and the file stays on your device the whole time.