PDF Merge: Complete Usage Guide

Purpose

PDF Merge joins two or more PDF files into a single document in the exact order you choose. It exists because one well-ordered file is dramatically easier to send, review, sign and archive than a folder of attachments. Job applications, client proposals, expense claims, tender submissions and court filings all benefit — and many of them formally require a single paginated PDF. The merge runs locally with pdf-lib, so contracts, payslips and medical records never leave your machine.

How to use it

1. 1Click 'Add PDFs' and select two or more files. You can add more in a second pass.
2. 2Drag the file cards into the order you want them to appear in the final document.
3. 3Remove anything you added by mistake with the X on its card.
4. 4Click Merge, then Download to save the combined PDF.

Tips & tricks

• Order matters: cover page, summary, detail, appendices, terms. Reviewers read the first pages closely and skim the rest.
• Trim dead pages with Delete Pages before merging so the bundle does not feel padded.
• Fix sideways scans with Rotate PDF first — a reviewer who has to tilt their head is already annoyed.
• Add sequential numbering afterwards with PDF Page Numbers so 'see page 14' means something.
• Name the output properly: 'Acme-Proposal-2026-02.pdf' rather than 'merged (3).pdf'.

Common errors and fixes