Why are the thumbnails slow on a big document?

Each page is rendered properly so you can actually read it. The document is opened once and the thumbnails fill in as they arrive; past about two hundred pages only the first two hundred are shown, and the rest keep their place untouched.

Can I combine this with another file?

Yes — append a second PDF and its pages join the board, where you can interleave them anywhere you like.

Can I add pages from another PDF?

Yes — append a second document and its pages join the board, where they can be moved among the existing ones before saving.

Why is dragging awkward on my phone?

Press and hold a page for a moment first: that tells the page you are dragging rather than scrolling. A short tap selects, a long press picks up.

Organize PDF

Reorder, rotate, delete and append pages on a thumbnail board, then save.

Runs in your browser — nothing uploaded

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How to use Organize PDF

Choose the PDF. Every page is rendered as a thumbnail you can see.
Drag thumbnails to reorder, rotate the ones that need it, and mark any page for deletion.
Press Save when the board looks right.

Questions

Why are the thumbnails slow on a big document?: Each page is rendered properly so you can actually read it. The document is opened once and the thumbnails fill in as they arrive; past about two hundred pages only the first two hundred are shown, and the rest keep their place untouched.
Can I combine this with another file?: Yes — append a second PDF and its pages join the board, where you can interleave them anywhere you like.
Can I add pages from another PDF?: Yes — append a second document and its pages join the board, where they can be moved among the existing ones before saving.
Why is dragging awkward on my phone?: Press and hold a page for a moment first: that tells the page you are dragging rather than scrolling. A short tap selects, a long press picks up.