Merging PDFs should be a 10-second task, not a reason to sign up for yet another subscription. ModernPDF combines your files right in the browser — drag them in, arrange the...
Open Merge PDFCombine PDFs instantly. Free to start.
Your PDFs are combined inside your browser using WebAssembly. Nothing is transmitted to any server — ever.
Server-based tools make you wait while files upload and download. Local processing means your merged PDF is ready in seconds.
No watermarks on output files. No forced account creation. No email required. Just merge and go.
Drag multiple PDF files into the tool, or click to browse your files. Add as many as you need.
Reorder documents by dragging them into the sequence you want. Preview pages before merging.
Hit the merge button. Your combined PDF is assembled locally and ready to download immediately.
Most free PDF mergers work by uploading your documents to a server, combining them remotely, and sending the result back. Your files pass through infrastructure you don't control, handled by software you can't inspect.
That trade-off made sense in 2010 when browsers couldn't handle PDF processing. It doesn't make sense in 2026. Modern browsers running WebAssembly can merge PDFs faster than a round-trip to a server — and without the privacy cost.
ModernPDF is built on this principle. The merge operation runs entirely in your browser tab. Close the tab and the files are gone. There is no server-side copy, no processing log, and no data retention policy to read because there is no data to retain.
Free users get 3 merge operations per day. Each operation can combine multiple files — so merging 5 PDFs into one counts as a single task. Pro users have no daily limits.
Free tier supports files up to 10MB each. Pro raises this to 500MB per file, which covers virtually any document.
Correct. Open your browser's developer tools (F12 → Network tab) while merging. You'll see zero outbound file transfers. The merge runs entirely via JavaScript and WebAssembly in your browser.
No. ModernPDF never adds watermarks to output files, on any tier. The merged PDF is identical to what you'd get from desktop software.
Yes. After adding your files, drag them into any order. You can also preview individual pages before combining. The final PDF follows the exact sequence you set.
Free to start. Files stay on your device. Upgrade to Pro for unlimited use.
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