PDF Merger
Combine multiple PDF files into one document — free, private, no uploads
Click to upload or drag and drop PDF files here
Upload multiple PDFs to merge them into a single file
Use our free PDF merger to combine multiple PDF files into a single document. Upload your files, arrange them in the order you want, and merge them instantly. Perfect for combining scanned documents, report sections, invoices, or any PDF files. All processing is done entirely in your browser using pdf-lib — your files never leave your device.
How to Merge PDF Files Online Free
- Upload your PDFs — Click the upload zone or drag and drop multiple PDF files from your computer.
- Reorder the files — Drag each file card up or down to arrange them in your preferred order.
- Merge — Click the "Merge PDFs" button. The tool combines all pages into a single PDF document.
- Download — Click "Download Merged PDF" to save your combined document. Your files are never uploaded to any server.
Why Use Our Free PDF Merger?
Unlike other online PDF tools that require you to upload sensitive documents to a server, our PDF merger runs 100% client-side. This means your confidential contracts, financial statements, and personal documents never leave your computer. There are no file size limits, no registration required, and no watermarks added to your output. The tool works on any modern browser including Chrome, Firefox, Edge, and Safari, and even works offline after the initial page load.
Frequently Asked Questions
How does this PDF merger work?
Upload multiple PDF files, arrange them in your desired order, and click Merge. The tool combines all pages from all PDFs into a single document using the pdf-lib library. Everything runs in your browser — no files are ever uploaded to a server.
Is this PDF merger free and private?
Yes, completely free and 100% private. Your PDFs are processed entirely in your browser using WebAssembly and never leave your device. No uploads, no tracking, no data collection. You can even use it offline after the page loads.
Is there a file size limit?
There is no artificial file size limit. The tool processes everything in your browser's memory, so very large files may be limited by your device's available RAM. For typical documents under 100MB, performance is excellent.
How do I reorder pages before merging?
After uploading your PDFs, simply drag the file cards up or down to reorder them. The merged document will follow the order shown in the list. You can also remove any file by clicking the X button.