Free PDF Tool · Merge

Merge PDF

Run merge pdf in your browser. Free, private, no signup — your selected files are processed in your browser and are not uploaded to our server.

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Drop your files here

or click to browse from your device

Accepts: .PDF

About this Merge PDF

Combine multiple PDF files into one document with our merge pdf tool. Drag and drop, arrange in the order you want, then download a single merged PDF — all in your browser, no upload of your selected files to any server.

This online merge pdf tool works on any device with a modern browser: Windows, Mac, Linux, Chromebook, iPhone, iPad, and Android. Because everything runs locally using JavaScript and the pdf-lib library, your selected files are processed in your browser and are not uploaded to our server. There’s no size limit other than what your device’s memory can handle, and there is no watermark added to your output.

Your privacy is the default. Your selected files are processed in your browser and are not uploaded to our server. This merge operation runs client-side using pdf-lib. Other PDF Tools Base tools use PDF.js, jsPDF, JSZip, and Tesseract.js where needed. Closing the tab clears the working session from this page; downloaded files remain on your device.

This tool is free to use with no signup required. Large files may be limited by your browser’s memory and device performance. Part of PDF Tools Base, a privacy-first collection of 161 PDF utilities. Bookmark the page for next time, and explore related tools in the footer below.

How to use the Merge PDF tool

  1. Drop or click to select 2 or more PDF files.
  2. Check the order in the file list — files merge in the order shown.
  3. Click Process to combine them into one PDF.
  4. Click Download to save your merged PDF.

Why use PDF Tools Base?

100% Browser-Based

Merge PDF processes selected files in your browser. Your selected files are processed in your browser and are not uploaded to our server.

No Server Upload, No Signup

Your selected files are processed locally in your browser. No account, no server upload, no email needed.

No Watermark Ever

Outputs are clean. We never stamp our brand or a paywall watermark on your files.

Free to Use

No accounts and no signup. Use the tool as much as you need within reasonable browser limits.

Works on Every Device

Windows, Mac, Linux, iPhone, iPad, Android, Chromebook. Any modern browser.

Built on Open Source

Powered by pdf-lib for browser-side PDF merging.

Common uses for merge pdf

Combine reports

Bring quarterly reports into one PDF for board distribution.

Bundle scans

Merge separately scanned pages into a single document.

Compile invoices

One PDF for end-of-month accounting.

Curriculum vitae

Combine CV, cover letter, and references.

Legal exhibits

Bundle individual exhibits as a single court filing.

Submit applications

Many universities and visa portals require one PDF only.

Frequently asked questions

Is Merge PDF safe to use?

Yes. Everything happens in your browser. Your selected files are processed in your browser and are not uploaded to our server. Closing the tab clears the working session from this page; downloaded outputs remain on your device until you delete them.

Do I need to register or sign in?

No. No account, no email, no sign-up. Open the page and start using the tool immediately. Free to use, no signup needed.

Is there a watermark on the output?

No. PDF Tools Base never adds a watermark or branding to your output. Your final file is clean — just what you produced from the original.

Is there a file size limit?

There’s no fixed limit. Since processing uses your device’s memory, phones may struggle with PDFs over 50–100MB; desktops may handle larger PDFs but can still fail on very large or complex files. Large PDFs may be slow or fail depending on browser, device memory, page count, and PDF complexity — try smaller files, splitting first, or a desktop browser.

Does this work on mobile devices?

Yes. The tool works on all modern mobile browsers: Chrome on Android, Safari on iOS, Firefox, Edge, Brave. The drag-and-drop also accepts files from your phone’s file manager.

How many PDFs can I merge?

There’s no fixed limit. The merge pdf tool processes them in the order you drop them. For very large batches (50+), expect a few seconds of processing time on a typical laptop.

How does merging affect quality and PDF structure?

Pages are copied without rasterizing, so visual quality is normally preserved. The output PDF is rebuilt, so file structure, metadata, bookmarks, signatures, forms, or object byte order may change.