Does merging PDFs affect quality?

No. The pages are copied exactly — text, images, fonts, and formatting are preserved without re-encoding. The merged file is functionally identical to the originals combined.

Can I reorder pages before merging?

Yes. Use the up and down arrows next to each file to set the order. The number on the left shows where each file will appear in the final PDF.

Will interactive elements like forms and links be preserved?

In most cases, yes. pdf-lib copies page content faithfully. However, some complex cross-document links may not resolve correctly after merging.

Can I compress the merged PDF to reduce file size?

Yes — use the Compress PDF tool on this site after merging. It re-saves the file with object stream compression to reduce size without degrading quality.

Can I split a PDF instead of merging?

Yes. The Split PDF tool extracts every page of a PDF into separate files, which you can download individually or as a ZIP archive.

Free · Private · Instant

Merge PDF Files

Combine multiple PDFs into one file in your browser. Nothing is uploaded.

Drop PDF files here

or choose files · .pdf files

Files stay on your device — nothing is uploaded

Why merge PDFs in the browser?

Most PDF merging tools work by uploading your files to a remote server, processing them there, then sending a combined file back. That means your documents — which might contain contracts, invoices, medical records, or personal photos — pass through infrastructure you know nothing about.

This tool uses pdf-lib, a JavaScript library that runs entirely inside your browser tab. No file is ever transmitted. The merging happens locally on your CPU, and when you close the tab, everything is gone from memory.

How to merge PDF files online

1
Drop your PDF files
Drag multiple PDF files onto the tool, or click to browse. You can add as many files as you need.
2
Reorder if needed
Use the up/down arrows to set the exact page order before merging. The numbers on the left show the current order.
3
Click Merge
The PDFs are combined entirely in your browser using JavaScript — no file ever leaves your device.
4
Download the merged PDF
Click the download button to save your combined PDF file.

Other PDF tools

Compress PDF — Reduce file size without re-encoding content
Split PDF — Extract individual pages into separate files

Frequently asked questions

Privacy & Safety

No. The merge happens entirely in your browser using the pdf-lib JavaScript library. Your files never leave your device. We cannot access, read, or store them.

There is no hard limit imposed by the tool. The practical limit is your device's available memory — most modern computers handle PDFs up to several hundred megabytes without issues.

How it Works

Other PDF Tasks