Are my files uploaded to any server when merging?

No. Optimax PDF merges your PDF documents 100% inside your browser's local RAM using WebAssembly. Your files never leave your computer or phone.

How do I change the order of the PDF files before merging?

After selecting your files, drag and drop the visual preview cards left or right, or use the Left/Right arrow buttons on any card to set the exact sequence.

Merge PDF Files

Combine multiple PDFs into one unified document. Drag cards or use arrow buttons to reorder before stitching.

Select PDF files or drag & drop them here

Select 2 or more PDF files • Processed 100% locally in your browser

Choose PDF Files

How to Combine and Merge PDF Files Online

Select Your PDFs: Click the upload box above or drag and drop two or more PDF documents into the dropzone.
Reorder Visually: Drag thumbnail cards left or right (or tap the arrow controls on mobile) to arrange the exact file sequence.
Download Merged File: Click Merge PDF Now to stitch your documents together immediately in your browser.

Visual Page Previews

Inspect the cover page and page count of every uploaded file before combining them.

No Cloud Size Caps

Because files never travel over the internet, you can merge large multi-megabyte reports in seconds.

100% Confidential

Ideal for legal contracts, tax filings, and medical records—zero third-party servers ever touch your data.