liminfoPDF Merge
Free web tool: PDF Merge
PDF 파일들을 여기에 드래그하거나
파일 선택최대 50MB, PDF 파일 (여러 파일 선택 가능)
About PDF Merge
PDF Merge is a free, browser-based tool that lets you combine multiple PDF documents into a single file without installing any software or uploading your files to a server. Using the pdf-lib library, it processes every PDF entirely within your browser memory, so your documents stay private on your device from start to finish.
The tool is designed for office workers, students, lawyers, accountants, and anyone who regularly assembles reports, contracts, or portfolios from separate PDF pages. Common use cases include combining scanned invoices into a single statement, merging individual chapter PDFs into a complete book, assembling application packets from multiple forms, and consolidating presentation handouts.
Technically, the converter reads each selected PDF file as an ArrayBuffer, loads it with PDFDocument.load(), then copies every page into a new merged document using copyPages() and addPage(). After all files are processed in your chosen order, mergedPdf.save() produces a new binary PDF that is offered as a direct browser download named merged.pdf — all without any network request.
Key Features
- Merge unlimited number of PDF files into a single document in one operation
- Drag-and-drop file input with support for selecting multiple files at once
- Reorder files up or down in the list before merging to control page sequence
- Remove individual files from the queue without restarting the entire selection
- Displays file name and file size for each queued PDF so you can verify inputs
- 100% client-side processing via pdf-lib — files never leave your browser
- Supports PDF files up to 50 MB each with no limit on total combined file count
- Download the merged result instantly as merged.pdf with a single click
Frequently Asked Questions
How many PDF files can I merge at once?
There is no hard limit on the number of files. You can add as many PDFs as your browser memory allows. Each individual file must be under 50 MB, but you can queue dozens of files and merge them all in one go.
Will the merged PDF preserve the original page layout and formatting?
Yes. The tool uses pdf-lib to copy pages directly from the source PDFs without re-rendering them. Fonts, images, vector graphics, annotations, and page dimensions are all preserved exactly as they appear in the originals.
Can I control the order of pages in the merged PDF?
Yes. The file list shows each PDF in the order they will be merged. Use the up and down arrow buttons next to each file to rearrange them before clicking the merge button.
Does this tool support password-protected PDFs?
No. Password-protected PDFs cannot be loaded by pdf-lib in the browser without the password being supplied. If you need to merge a protected PDF, you must first remove the password protection using a dedicated tool, then use this merger.
Is my data safe when merging PDFs online?
Completely. All processing happens inside your browser using JavaScript. Your PDF files are never uploaded to any server, never stored on disk, and are not accessible to anyone else. The merged result is created entirely in browser memory and downloaded directly to your device.
What happens to the original files after merging?
Your original files are not modified at all. The tool reads them into memory, creates a new merged document, and then you download that new file. The originals remain exactly as they were on your computer.
Can I merge PDFs on a mobile device or tablet?
Yes. The tool is fully responsive and works on iOS Safari, Android Chrome, and other modern mobile browsers. You can select files from your device storage and the merge process runs entirely on the device.
Why does the merged file sometimes appear larger than the sum of the inputs?
PDF files may contain embedded fonts or resources that are duplicated when pages are copied from multiple sources. pdf-lib copies page streams faithfully, so shared resources from different files are not automatically deduplicated, which can slightly increase file size.