What Is PDF Merger?

A free online PDF merger that lets you combine multiple PDF files into a single document. Upload PDFs, drag to reorder them, remove unwanted pages, and merge them instantly. All processing happens in your browser — your files never leave your device. No sign-up, no watermarks, no file size limits.

Merging PDFs is one of the most common document tasks, yet many online merger tools require uploads to remote servers, impose file size limits, or watermark the output. PDF Merger handles everything locally in your browser: combine up to 10 PDFs into one document, drag to reorder them, remove unwanted files, and download the result with no watermarks, no file size limits, and no sign-up.

The workflow is simple and visual. Upload multiple PDFs by clicking or drag-and-drop — each file appears as a card in the merge queue with its filename and page count. Drag the cards to reorder the files in your desired sequence. Click any card to remove it from the queue. When the order is set, click Merge and the tool combines all pages from all files into a single PDF download.

What makes this merger reliable is its handling of real-world PDF quirks. The tool uses PDF-Lib, a robust JavaScript library that preserves the internal structure of each source PDF — fonts, images, annotations, and formatting are carried into the merged output without corruption. The merger also handles mixed formats: combine text-based PDFs with scanned document PDFs, or merge PDFs created by different tools (Word, Google Docs, Photoshop, etc.) in a single session.

Since all processing is local, your documents never leave your device. This is critical for sensitive files like contracts, HR documents, and financial statements where server-side processing would create a privacy risk. There are no upload caps or queue limits — merge as many PDFs as you need, as often as you need, with no throttling.