Merge PDF

Merge multiple PDF documents into a single file in the order you choose. The combine happens entirely in your browser — your contracts and statements stay on your device.

Conversions

About Merge PDF

Merge PDF stitches several PDF files into one, keeping the original page content and quality unchanged. Drag and drop to enforce order before combining, which is convenient for assembling contracts, course notes, or a month of invoices into a single shareable document. Because the merge runs locally in your browser via JavaScript, even confidential client files and HR documents remain on your device the whole time.

Best for

  • Assembling signed contracts with their annexes into one deliverable
  • Combining an accountant's monthly invoices and receipts for clients
  • Merging course handouts, slides, and labs into one course pack

Pros

  • +Drag and drop files to set the merge order precisely
  • +Page content and quality are preserved — only the container changes
  • +Confidential contracts never leave your device (no server upload)

Cons

  • −Encrypted PDFs cannot be merged without their password
  • −Very large stacks (hundreds of files or tens of thousands of pages) hit browser memory limits

How to use Merge PDF

  1. 1

    Select or upload the source files from your local device storage.

  2. 2

    Specify conversion settings, options, or target output formats.

  3. 3

    Wait for the client-side browser logic to process the files securely.

  4. 4

    Download the finalized outputs directly to your system.

Frequently Asked Questions

How do I choose the order of PDFs in the merged file?
Add all your PDFs to the upload area, then drag each file to its place. The merge runs in the order you arrange, top to bottom.
Can I merge encrypted or password-protected PDFs?
Only unlocked files can be merged. Open the encrypted PDF in a viewer, enter the password, then export a copy (or use a print-to-PDF step) before merging here.
How many PDFs can I merge in one pass?
There is no fixed cap, but every page stays in memory until the output is built. Hundreds of small PDFs or a few thousand-page PDFs work; beyond that, available RAM may limit the merge on phones and low-end laptops.
Does merging reduce PDF quality?
No. Merging rewrites the container — the original pages, images, and fonts are concatenated unchanged, so visual quality and text fidelity are identical to the inputs.
Are my client contracts uploaded to a server?
No. The entire merge runs in your browser via local JavaScript. Your files never leave the device, which matters for HR files, medical records, and other sensitive documents.

Related tools

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Merge PDF Quality Rating

4.8
25 reviews

How was your experience? You need to convert and download at least one file to provide feedback!