How merge works
Select two or more PDF files. Pages are copied in the same order you picked them. Encrypted or damaged files cannot be opened. Very large scanned PDFs can be slow on a phone.
How split works
Select one PDF and type the pages you want. Examples: 1-3 keeps pages 1, 2 and 3. 1,4,7 keeps those three pages. 2-2 keeps only page 2. The new file downloads as split.pdf.
Privacy
Files are not uploaded to SeaToolbox. This is not a replacement for signing or locking a legal document. Password-protected PDFs will fail until they are unlocked.