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How to Merge PDF Files

You have multiple PDF files — chapters of a report, scanned pages from different sessions, a contract split across separate documents — and you need them as one. Here is how to combine them in under 30 seconds, without installing software or uploading anything.

KuroPDF merges PDFs directly in your browser. There is nothing to install, no account to create, and no limit on how many files or how large they are. Your documents stay on your device the entire time.

This works on any device with a modern browser: Windows, Mac, Chromebook, iPhone, iPad, or Android. The tool uses WebAssembly for speed, so even a 200-page merge completes in seconds.

Open the Merge PDF tool →
  • Files never leave your device
  • No size limits
  • Free, no sign-up

How to how to merge pdf files

  1. 1
    Go to the Merge PDF tool

    Open kuropdf.me/merge-pdf in any modern browser. No installation or account required.

  2. 2
    Add your PDF files

    Click "Choose Files" or drag and drop multiple PDFs directly onto the page. Add as many files as you need — there is no limit.

  3. 3
    Arrange the page order

    Drag files up and down to set the order they will appear in the final document. The first file becomes the first pages, and so on.

  4. 4
    Click Merge

    Hit the "Merge PDFs" button. The combined document processes locally in your browser and downloads automatically.

  5. 5
    Verify the result

    Open the merged PDF to confirm all pages are present and in the correct order. The original files are untouched — you can re-merge in a different order if needed.

Frequently asked questions

How many PDFs can I merge at once?

There is no limit. Users regularly merge 50-100 files in a single session. The only constraint is your device memory.

Will my files be uploaded to a server?

Everything runs locally in your browser using WebAssembly. Because no data is uploaded to a cloud server, your files remain strictly private, and the entire process generates zero server carbon emissions, making it highly eco-friendly.

Can I merge PDFs on my phone?

Yes. KuroPDF works in any modern mobile browser (Safari, Chrome, Firefox). Just open the site, add files, and merge — same workflow as desktop.

Are bookmarks and form fields preserved?

Yes. The merge preserves bookmarks, hyperlinks, form fields, and annotations from all source files.

Can I merge password-protected PDFs?

You need to unlock them first. Use the Protect PDF tool to remove the password (you must know it), then merge the unlocked files.

Is there a way to merge PDFs offline?

Yes. Install KuroPDF as a Progressive Web App (your browser will offer this option), and the merge tool works without any internet connection.

How is this different from Adobe Acrobat?

Adobe Acrobat Pro costs $20/month and requires installation. KuroPDF is free, runs in your browser, requires no account, and processes files locally instead of uploading them to Adobe servers.

The real difference

Why KuroPDF exists

Every other PDF tool uploads your files to their servers. We think that is broken. Here is what we do differently - and what the alternatives actually cost you.

Nothing leaves your device

Files are processed in your browser using WebAssembly. Open DevTools → Network tab and verify: zero upload requests. Ever.

What competitors do instead:

Smallpdf, iLovePDF, and Adobe Acrobat all upload your files to their servers - your contracts, bank statements, and medical records pass through third-party infrastructure.

No file size limits, no daily caps

Process a 500-page PDF or batch-convert 200 photos. No cap, no throttle, no upgrade wall. Your device is the only limit.

What competitors do instead:

Smallpdf limits free users to 2 tasks per day. iLovePDF caps file sizes at 100MB. Adobe requires a $19.99/mo subscription for basic features.

Works completely offline

Install KuroPDF as a progressive web app. After the first visit, every tool works with zero internet - on a plane, in a bunker, wherever.

What competitors do instead:

Every cloud-based PDF tool stops working the moment your Wi-Fi drops. No connection = no work.

Real encryption, not security theatre

Password protection uses AES-256 encryption via a WebAssembly build of qpdf. The password never leaves your machine - there is no server to intercept it.

What competitors do instead:

When you 'protect' a PDF on Smallpdf or iLovePDF, your unencrypted file and password travel to their server, get processed, then get sent back. That is not security.

Free forever, no account needed

No login wall, no email harvesting, no 'continue with Google' popup. Open the site, use the tool, close the tab. Done.

What competitors do instead:

Adobe charges $239/yr. Smallpdf charges $108/yr. iLovePDF charges $84/yr. All require account creation to use basic tools.

Professional-grade codecs

MozJPEG for JPEG, OxiPNG for PNG, AVIF and WebP encoders - the same codecs used by Google and Mozilla. Not generic re-encoding.

What competitors do instead:

Most cloud tools use basic server-side encoders with less optimization control. You get worse compression at lower quality.

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