Updated June 2026 · runs 100% in your browser

Merge PDF

Combine several PDFs into a single document on your device, in the order you add them. No upload, no sign-up, no limits.

Drop PDFs here

or click to choose

🔒 Merged on your device · 0 bytes uploaded

How it works

ConvertCabin runs the open-source PDF engines (pdf-lib and pdf.js) inside this browser tab, so your PDF is read, transformed and re-saved entirely on your device. Nothing is uploaded — no queue, no daily cap, no account.

Most PDF sites upload your document to a server first. Because ConvertCabin works locally, it stays free, unlimited and private — and keeps working offline once the page has loaded.

About merging PDFs

All the pages from each PDF are copied, in order, into one new document. Great for stitching together chapters, scans, or signed pages into a single file.

Frequently asked questions

How do I merge PDF files?
Add the PDFs you want to join, press Merge PDFs, and download the combined file — all in your browser.
Does the order matter?
Yes. PDFs are merged in the order you add them; remove and re-add to change the sequence before merging.
Are my PDFs uploaded?
No. They are combined on your device with pdf-lib and never sent anywhere.
What is a PDF file?
PDF (Portable Document Format) preserves a document's exact layout, fonts, and images on every device and operating system, which is why it's the standard for sharing files that must look identical everywhere.