PDF Merge — what it does
Combines any number of PDFs into a single file in the order you choose — twelve invoices into one mail attachment, application documents into one upload, chapters into one report. Pages are copied one by one in the browser with pdf-lib, so nothing is uploaded and no account is involved.
How to use PDF Merge
- Drop in two or more PDFs, or pick them from your disk.
- Drag the files into the order you want. The running page count updates as you go, so you can see what the finished document will be before you merge.
- Remove any file you added by mistake — the page count drops immediately.
- Merge. Each file's pages are appended in order into one document.
- Download the merged PDF. Your original files are left exactly as they were.
Worked example: a year of invoices from one vendor
A vendor sends twelve monthly invoices as twelve separate PDFs and your accounting inbox wants one file per vendor per year. Add all twelve, drag January to the top, merge, and download a single 12-page (or 40-page, if they attach annexures) document. The rent agreement and bank statement sitting in your Downloads folder are never touched, because the tool only reads the files you hand it.
At a glance
| Input | Any number of PDF files |
|---|---|
| Output | One merged PDF in your chosen order |
| Ordering | Drag to reorder; page counts update live |
| Where it runs | Your browser, on-device — works offline after first load |
| Limit | Files must be real PDFs; an encrypted file is refused rather than silently producing a broken merge |
Frequently asked questions
- What is PDF Merge?
- Combine multiple PDFs into one file, in the order you pick. Nothing leaves your browser.
- Is PDF Merge free to use?
- Yes — PDF Merge is free to use, with no sign-up, no install and no account.
- Does PDF Merge upload or store my data?
- No — PDF Merge runs entirely in your browser, so your text, files and results never leave your device.
- Do I need to install anything to use PDF Merge?
- No — it works in any modern browser (Chrome, Edge, Firefox, Safari) with no downloads, accounts or plugins.
- Is there a file size or page limit?
- No server-side limit exists because there is no server — the merge runs on your machine, so the practical ceiling is your browser's memory. Merging a few hundred pages is routine; merging a 500 MB scan set on a phone will feel slow, because the work is your device's.
- Are bookmarks and internal links kept?
- Page content, form fields and outlines are carried over where the PDF structure allows it. Internal links that point at page numbers can shift meaning after a merge, so check them on anything going to a client.