How do I merge PDF files for free?

Upload your PDFs by dragging them onto the page or using the file picker. Reorder them by dragging the rows, then click Merge PDFs. The combined PDF downloads instantly — no account needed.

How do I combine multiple PDFs into one file?

Upload all the PDFs you want to combine, arrange them in the desired order by dragging the rows, and click Merge PDFs. All pages from every file are combined into a single downloadable PDF.

Is there a limit to how many PDFs I can merge?

No. You can merge as many PDF files as you need. The only limit is your device's available memory. Each file can be any size — there is no per-file size restriction.

Are my PDF files safe? Are they uploaded to a server?

Your PDF files never leave your device. All merging is performed locally in your browser using PDF-lib — a JavaScript library that runs entirely client-side. No uploads, no privacy concerns.

Can I reorder the pages before merging?

Yes. Drag the PDF rows up or down to set the exact merge order before clicking Merge PDFs. On mobile devices, use the ↑↓ arrow buttons on each row.

Can I merge encrypted or password-protected PDFs?

The tool attempts to open encrypted PDFs. Most PDFs with owner passwords (print/edit restrictions) can be merged. User-password-protected PDFs (requiring a password to open) will be skipped with a warning.

How do I merge PDFs on a Mac or iPhone?

Open the PDF Merger in Safari or Chrome on your Mac or iPhone. Upload your PDFs, arrange them in order, and click Merge PDFs. The tool works on all devices and operating systems — no app needed.

What is the difference between merging and combining PDFs?

Merging and combining PDFs mean the same thing — taking multiple PDF files and joining them into a single PDF document. The page order in the merged PDF matches the order you set in the file list.

Can I add more PDFs after I have already uploaded some?

Yes. Click the Add More PDFs button to upload additional files to the list at any time before clicking Merge PDFs.

Free Online Tool

PDF Merger

Combine multiple PDF files into one document — instantly in your browser. Drag to reorder, remove files, then merge with one click. 100% private.

100% Private Drag to Reorder Unlimited Files Instant Merge

Drop your PDF files here Release to upload

or click to browse — select multiple files at once

PDF files only

Max 50 MB per file · All processing happens locally in your browser

PDF Files

Merge Summary

Files queued for merging

Files

Total Pages

Combined Size

Merge Order

Files are merged top to bottom in the order shown. Drag rows or use ↑↓ to reorder.

Reading PDF files…

Merging pages…

Merge Complete!

PDF

Files Merged

Total Pages

Output Size

Format

PDF

How It Works

Four simple steps to combine your PDFs

Upload PDFs

Drag & drop or click to browse. Select multiple PDF files at once — no limit on the number of files.

Reorder Files

Drag rows up and down to set the exact merge order. On mobile, use the ↑↓ arrow buttons to reorder.

Click Merge PDFs

Hit the Merge button. PDF-lib combines your files in the browser — no server round-trip, instant results.

Download Result

Review the merged file stats (pages, size) and download the combined PDF to your device with one click.

Why Use Our PDF Merger?

Powerful, private PDF merging without any server uploads.

100% Private

Your PDFs never leave your device. All merging is done locally using PDF-lib in the browser — zero server uploads.

Drag to Reorder

Drag and drop rows in the file list to set the exact merge order. On mobile, use the arrow buttons.

Page Count Preview

Each uploaded PDF shows its page count so you know exactly how many pages will be in the final document.

Unlimited Files

Add as many PDFs as you need. There is no cap on the number of files — combine an entire folder in one go.

Instant & Lightweight

No waiting for servers. PDF-lib processes your files in milliseconds using your device's CPU.

Free Forever

No sign-up, no subscription, no watermarks. The PDF Merger is completely free for everyone.

Frequently Asked Questions

Everything you need to know about merging PDF files online

Upload your PDFs by dragging them onto the page or using Browse. Reorder the rows if needed by dragging them, then click Merge PDFs. The combined PDF is ready to download instantly — no account required.

No limit. You can merge as many PDFs as you like. The only constraint is your device's available memory. Each individual file can be up to 50 MB.

Yes, completely. Your PDF files never leave your device. All merging is performed locally using PDF-lib — a JavaScript library that runs entirely inside your browser. Nothing is uploaded to any server.

Yes. Drag any row up or down in the file list to set the exact merge order. On mobile, use the ↑↓ arrow buttons on each row. Files are merged top-to-bottom in the order displayed.

The tool attempts to load protected files with the ignore-encryption option. Some heavily encrypted files may fail — they will be skipped and marked as failed while the rest merge normally.

Yes. The PDF Merger works on all modern mobile browsers including Chrome and Safari on iPhone and Android. Use the ↑↓ arrow buttons to reorder files on mobile.