How to Merge PDF Files Online
Merging PDF files is one of the most common PDF tasks — whether you're combining reports, contracts, or scanned pages into a single document. SublimePDF lets you merge PDFs instantly in your browser with no file uploads to any server.
Follow the step-by-step instructions below, then use the free tool directly — no registration or download required.
Open Tool →How to Merge PDF Files Online — Step by Step
Open the Merge PDF tool
Navigate to SublimePDF's Merge PDF tool. No registration or account needed.
Add your PDF files
Drag and drop or browse to select the PDF files you want to merge. You can add as many files as you need.
Arrange the order
Drag the files into your desired order. The final PDF will combine them in the sequence shown.
Merge and download
Click 'Merge PDFs' and download your combined document. Processing happens instantly in your browser.
Pro Tips
- 💡 You can also merge image files (JPG, PNG) with PDFs — they'll be converted automatically
- 💡 Large files may take a moment to process depending on your device
- 💡 Reorder pages by dragging thumbnails before merging
Privacy & Security
All processing happens directly in your browser. Your files are never uploaded to any server — they remain on your device throughout the entire process. SublimePDF uses WebAssembly technology for fast, secure, client-side processing.
Works Everywhere
This tool works on any modern browser — Chrome, Firefox, Safari, or Edge — on desktop, tablet, or mobile. No software to install. PDF is an open ISO standard supported by all major platforms.
How to Merge PDF Files Online — FAQ
Is merging PDFs free?
Are my files uploaded to a server?
Can I merge password-protected PDFs?
Is there a file size limit?
Related Guides
How to Split PDF Pages
Need to extract specific pages from a large PDF or split a document into separate files? SublimePDF's Split PDF tool makes it easy — select your pages and download instantly.
How to Reorder PDF Pages
Need to rearrange the pages in your PDF? SublimePDF's drag-and-drop interface makes it easy to reorder pages into any sequence you need.