Pages are copied across exactly as they are, so the result stays sharp at any zoom or
print size, and its text can still be selected and searched.
As many files as you like
Add them all at once or a few at a time, and keep adding after you have started. The same file can be added twice without the two copies interfering.
Drag to set the order
Grab a card and move it left or right; a marker shows where it will land. The arrows in each card's corner do the same thing one step at a time, and the badge on every card is its position in the output. Name A→Z sorts the whole set in one click, with part-2 before part-10.
One thumbnail per file
Only the first page of each file is drawn, never every page. That is what keeps this tool cheap on a 300MB set, and it is enough to tell two similarly named scans apart while you arrange them.
Nothing is re-encoded
Pages are copied across as they are. Text stays text, vectors stay vectors, images keep their own resolution. A searchable PDF comes out searchable.
Gentle on memory
Source files are opened one at a time while the output is built and released before the next is read, rather than all of them being held open at once. A 300MB merge measured about 2.4GB at its peak, and produced a correct file.
Undo the arrangement
Every move is undoable, so trying an order costs nothing. Removing a whole file asks first, because that is the one step undo does not cover.
