Merge PDF - Combine PDF Files Online
Combine multiple PDF files into a single unified PDF document.
Processed 100% locally in your browser. Your files never leave your device.
About Merge PDF - Combine PDF Files Online
Merges uploaded PDF documents in your specified page sequence using client-side WASM processing.
What Can You Use This Tool For?
Students, legal professionals, administrative teams, and business owners use Merge PDF Files to quickly manage, convert, and optimize sensitive PDF contracts, assignments, and reports with guaranteed local browser privacy.
How to Merge PDF Files Online
1. Click "Select PDF Files" or drag & drop files into the dropzone.
2. Drag thumbnails to reorder pages or documents into your preferred sequence.
3. Click "Merge PDFs" to assemble all pages into a single document.
4. Download your combined PDF file instantly.
Usage Examples
Combining Monthly Invoices into One PDF
Input: Jan_Invoice.pdf (2 pages) + Feb_Invoice.pdf (3 pages) Action: Merge Result: Combined_Invoices.pdf (5 pages total)
Frequently Asked Questions
Are my PDF documents uploaded to a remote server?
No. Unlike traditional PDF conversion sites, Numvax processes PDF documents entirely inside your web browser using WebAssembly and client-side JavaScript. Your confidential files never leave your device.
What is the maximum PDF file size supported?
Because processing occurs in your local browser memory, you can manipulate large multi-page PDF documents smoothly without server upload timeout errors.
Will the formatting and fonts of my PDF be preserved?
Yes, the tool utilizes precision document rendering engines to maintain original text layout, font structures, vector graphics, and embedded images.
Can I process password-protected PDF files?
If a PDF requires a password, unlock it using our Unlock PDF tool first before merging, editing, or splitting.
Is there a limit on how many PDF files I can merge?
There is no hard file count limit. Since merging runs locally in your browser, performance depends on your device memory.
Are my private PDF files secure?
Yes! PDF merging runs 100% locally in your web browser. Your files are never uploaded to any server.
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