Merge PDF
Merge multiple PDF files into a single document. Reorder pages, drop in as many files as you like, and download instantly. Free, private and in-browser — nothing leaves your device.
Drop PDF files here
or click to choose · add as many as you like
How to use the Merge PDF
- 1Open the Merge PDF tool and drag your PDF files onto the drop zone, or click Upload files to pick them from your device — add as many as you need.
- 2Watch each file appear as a row or thumbnail in the list; the whole document is read locally in your browser, so nothing uploads.
- 3Drag the files up or down to set the exact order the pages should appear in the final document.
- 4Remove any file you added by mistake with its delete or X control, and re-add or reorder as needed.
- 5Click Merge (or Combine PDF) to stitch all pages into one document — this runs instantly on your machine.
- 6Click Download to save the single merged PDF to your device, then attach or share it.
About the Merge PDF
Merge PDF combines two or more PDF files into a single, continuous document — and it does the entire job inside your web browser using JavaScript and the PDF-lib engine. When you add files, they are read into memory on your own machine; the page copies each source document's pages into one new PDF and hands it back to you as a download. Nothing is uploaded, queued, or stored on a remote server, which is why the merge finishes the instant you click and why even confidential files never leave your device.
The workflow is deliberately flexible. Drop in a signed contract and its appendices, a cover letter and a resume, a batch of scanned invoices, or a dozen chapter exports from a design tool. Each file appears as a thumbnail or row you can drag to reorder, so the final page sequence is exactly what you set — file three can lead, the title page can sit last, whatever the document needs. Because it runs client-side, page count and file size are limited only by your browser's available memory rather than an upload cap; large photo-heavy PDFs simply take a moment longer to process.
Real users reach for this constantly: freelancers bundling a proposal, a rate sheet, and terms into one attachment; students combining assignment pages before an LMS upload that accepts a single file; bookkeepers stapling monthly receipts for an accountant; job seekers who need resume plus portfolio as one clean PDF. Anyone who has been told "please send this as a single document" is the target.
A few practical tips. Name your source files in the order you want them and they'll usually load pre-sorted, saving drag time. Merging preserves the original page dimensions, so mixing A4 and US Letter pages will keep both sizes — normalize beforehand if uniformity matters. The tool copies existing text and vector content rather than flattening to images, so selectable text and links survive the merge. If a file is password-protected, unlock it first; encrypted PDFs can't be read into the merge. When you're done, the combined file downloads straight to your device, ready to send.
Frequently asked questions
Does merging change the quality or resolution of my PDFs?
No. The tool copies each page's original content — text, vectors, and embedded images — into the new file at full fidelity rather than re-rendering or compressing it. A merged page looks identical to its source, and selectable text and hyperlinks stay intact.
Can I reorder the files, or do they merge in the order I add them?
You can reorder freely. Every file appears as a draggable row, so you can arrange them into any sequence before merging. If you'd rather not drag, naming your files 01, 02, 03 and so on usually loads them in that order automatically.
Is there a limit on how many files or pages I can merge?
There's no fixed server cap because everything runs in your browser. The practical limit is your device's available memory. Dozens of ordinary documents merge fine; very large, image-heavy PDFs use more RAM and take a few extra seconds to assemble.
Can it merge password-protected or encrypted PDFs?
Not directly. An encrypted PDF can't be read into the merge until it's unlocked. Remove the password in your PDF viewer first, then add the unprotected file. The merged output itself is a standard, unencrypted PDF.
Are my files uploaded anywhere when I merge them?
No. The merge happens entirely client-side with JavaScript — your files are read into your browser's memory, combined there, and offered back as a download. They are never sent to or stored on any server, which is why sensitive contracts and financial documents stay private on your own machine.
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Frequently asked questions
Is there a file limit?+
No. Add as many PDFs as you like and reorder them before merging.
Are my documents uploaded?+
No — merging happens in your browser, your files stay private.