Is the PDF merger free?

Yes, completely free with no limits, no watermarks, and no account required.

Are my PDF files uploaded to a server?

No. All merging happens locally in your browser using PDF-lib. Your files never leave your device.

How many PDFs can I merge at once?

There is no hard limit. You can merge as many PDFs as your browser can handle. For best performance, keep individual files under 50 MB.

Can I reorder the PDFs before merging?

Yes. Drag and drop the files in the list to set the exact order before merging.

Will the merged PDF preserve quality?

Yes. PDF-lib copies pages directly without re-encoding, so the original quality, fonts, and images are preserved exactly.

📎 PDF Tools

Merge PDF Files — Free & Private

Combine multiple PDF files into a single document in seconds. Drag to reorder, add as many PDFs as you need — runs entirely in your browser, nothing is uploaded.

✓ Free forever✓ No upload✓ No signup✓ Reorder pages

📂

Drop PDF files here

or click to browse · Select 2 or more PDFs

Loading PDF engine…

✅

Merge complete!

⬇ Download Merged PDF

How to Merge PDF Files

Add Your PDFs

Drop 2 or more PDF files onto the tool, or click to browse and select them.

Reorder if Needed

Drag the files up or down to set the exact order they'll appear in the merged PDF.

Click Merge

Hit "Merge PDFs" — combining runs instantly in your browser using PDF-lib.

Download

One click downloads your merged PDF — all pages, original quality, ready to share.

Why Use Convertlo to Merge PDFs?

🔒 100% Private — files never leave your browser, zero server uploads
🆓 Free forever — no account, no watermark, no file size cap per session
↕️ Drag to reorder — set any page order before merging
📄 Original quality preserved — pages copied directly, no re-encoding
♾️ No page limit — merge PDFs with hundreds of pages
📱 Works on mobile — works on any device with a modern browser

Features

🔒

100% Private

No server. No upload. Your PDFs stay on your device the whole time.

↕️

Drag to Reorder

Drag any file up or down in the list to control page order.

⚡

Instant

Merging completes in seconds for typical documents.

📄

No Quality Loss

PDF-lib copies pages without re-encoding — full original quality.

♾️

No Limit

Add as many PDFs as you need. No file count cap.

📱

Mobile-Ready

Works on iPhone, Android, tablet, and desktop.

Frequently Asked Questions

Yes — completely free, no limits, no watermarks, no account required. Convertlo runs entirely in your browser using open-source PDF-lib.

No. All merging happens locally in your browser. Your files never leave your device. This is why there's no file size limit — it's all local processing.

There is no hard cap. You can merge as many PDFs as your browser memory allows. For best performance, keep individual files under 50 MB each.

Yes. Once you've added your files, drag the ≡ handle on any row to move it up or down. The merged PDF will follow that exact order.

Yes. PDF-lib copies page objects directly without re-rendering, so fonts, vector graphics, images, and formatting are all preserved at their original quality.

Password-protected PDFs cannot be merged. Remove the password first using Preview on Mac or Adobe Reader, then merge here.