How do I merge multiple PDFs into one?

Drop your PDF files (plus optional JPG, PNG or WebP images) into the tool. Every page appears as a thumbnail in the page matrix — drag pages to reorder them, click to select, use R to rotate and Delete to remove. Choose a page size (preserve, A4 or US Letter) and whether to add bookmarks from file names, then click Merge and Download PDF. Everything happens locally in your browser.

Can I merge password-protected PDFs?

Yes. When you add a locked PDF, the tool asks for its document password. The password and file are processed entirely in your browser — nothing is uploaded. Once unlocked, the pages are decrypted locally and included in your merged document, even if the original also had copy restrictions.

Are merged PDFs uploaded to any server?

No. All merging runs client-side using a Web Worker. Your PDFs and images are read into memory in your browser, processed locally, and the finished file downloads straight to your device. Nothing is ever sent to a server.

Can I mix PDFs and images in one document?

Yes. You can combine PDF pages with JPG, PNG and WebP images in any order. Images are converted to full-page PDFs as they are placed, and you can reorder, rotate and remove them like any other page in the matrix.

PDF Merger

Free online PDF merger. Combine multiple PDFs and images into one document with drag-and-drop page arranging, rotation, A4/Letter sizing and bookmarks. ...

🔒

100% Private & Client-Side PDF Processing

Your documents are processed entirely in your browser using Web Workers. Files are never uploaded to any server and are permanently deleted from memory when you leave this page.

Works offline

Step 1 · Add Files

0 files · 0 pages

Drop PDF files or images here

Combine PDFs, JPG, PNG and WebP images into one document

Choose Files

Accepted: .pdf,image/jpeg,image/png,image/webp,.jpg,.jpeg,.png,.webp · No size limit

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Embed this tool

Copy and paste the code below into your website to embed this tool for free. An attribution link to The Util Box is required.

<iframe src="https://www.theutilbox.org/embed/pdf-merger" width="600" height="500" frameborder="0" style="border: none; max-width: 100%;" title="Free PDF Merger tool from The Util Box"></iframe>
<!-- Free tool by The Util Box — https://www.theutilbox.org/tools/pdf-merger -->
<a href="https://www.theutilbox.org/tools/pdf-merger">PDF Merger by The Util Box</a>

Frequently Asked Questions about PDF Merger

Merge PDF Files Online — Free, Private & Instant

The PDF Merger combines multiple PDF documents — and JPG, PNG or WebP images — into a single file with full page-level control. Unlike desktop software or online services that upload your documents to a server, this online PDF merger runs entirely in your browser using Web Workers. Every page is rendered as a thumbnail in an interactive matrix where you can drag to reorder, click to select, rotate with the R key, and remove pages with Delete. An unlimited undo stack means you can always step back. When you are ready, choose A4, US Letter, or preserve the original page size, add automatic bookmarks built from your file names, and download a perfectly combined PDF.

How to Merge PDFs Without Uploading

Step 1 — Drop Your Files

Drag and drop several PDFs, or mix in images. The tool reads each file locally and builds a visual page-by-page preview instantly. Files are never transmitted — the entire merge runs on your device.

Step 2 — Arrange the Pages

The page matrix shows every page of every file. Drag pages into your final order, rotate mis-scanned pages, use odd/even selection for booklets, and trim unwanted pages with one click. Batch tools handle merge PDF pages quickly even for large documents.

Step 3 — Combine Images & PDFs

This PDF joiner accepts JPEG, PNG and WebP photos alongside PDF pages, so you can assemble scanned pages, photos, and text documents into one continuous file — ideal for combined reports or e-signature packages.

Step 4 — Download the Result

Click Merge & Download. The combined PDF is assembled locally and saved straight to your device — no account, no queue, no uploads, and no waiting for a server.

Why Use a Client-Side PDF Merger?

Total privacy — sensitive contracts and documents never leave your computer, making this the safest way to combine PDFs online.
Handles locked files — enter a document password and encrypted PDFs are decrypted locally and merged, unlike most free services.
No size limits — because nothing is uploaded, you are limited only by your device's memory, not a server's quota.
Works offline — after the first load, merging works without an internet connection.

Why Choose Our Free PDF Merger?

Our free online PDF merger has no hidden premium tiers, no watermarks, and no usage limits. It runs 100% client-side — your files stay private, the tool works offline after first load, and it is fast enough for documents with hundreds of pages. Combine PDFs and images, organize pages visually, and download a clean result in seconds, all without ever sending a byte to a server.