pdf.com Simple as 1

Pdf Split

By Page Number

Cutting points decided by pages: page ranges, a fixed page count, or one file every N pages.

Open By File Size

Cutting points decided by size: set a maximum size per part and it is split into smaller files automatically, however big the original is.

Open
Cut one page into two Split Pages into Columns

Cut one page into two, left/right or top/bottom — for example turning one A3 into two A4 pages, very handy for printing.

With 「Split Pages into Columns」 you first select the pages, then click 「Split column」 in the toolbar, and finally press the convert button at the top right to get the Pdf. Open
Not sure which one to pick?

You want every part to have the same number of pages, or to cut at exact chapters → pick "By Page Number". You decide how many pages each part has.

The file is too large to upload and you want every part under a size limit (e.g. a 20 MB attachment) → pick "By File Size". The cutting points are found automatically from the size.

Can't find what you need?

Both options on this page split 「one Pdf」 into 「several files」. If you want to split 「one page」 into 「two pages」 (for example A3 into two A4), pick 「Split Pages into Columns」: it opens the 「Merge to PDF (Page Edit)」 page, where you upload the file and click the 「Split column」 button in the toolbar (left/right, left/center/right, top/bottom or top/middle/bottom).