PDF Merger
Combine multiple PDF files into one document easily.
How to Use PDF Merger
- 1Click the upload area or drag and drop your PDF files into the drop zone.
- 2Add as many PDFs as you need — there is no limit on the number of files.
- 3Use the ▲ and ▼ arrow buttons to reorder the files into the desired sequence.
- 4Click 'Merge PDFs' and wait a moment while the files are combined in your browser.
- 5Click 'Download Merged PDF' to save the result to your device.
Frequently Asked Questions
How many PDFs can I merge at once?
There is no hard limit. You can merge as many PDF files as your browser's memory can handle. For best performance, we recommend merging no more than 50 files at a time or keeping the total size under 500 MB.
Will the merged PDF lose quality or formatting?
No. Our PDF Merger uses pdf-lib to copy pages at the byte level, preserving all fonts, images, vector graphics, and embedded content exactly as they appear in the originals.
Can I merge password-protected PDFs?
Our tool can attempt to open encrypted PDFs, but password-protected files may not merge correctly. Remove the password protection first using your PDF reader, then merge.
Is my data safe? Are the PDFs uploaded to a server?
Your files never leave your device. All merging is done entirely in your browser using JavaScript. No file is transmitted to any server, so your documents remain completely private.
What is the maximum file size I can merge?
There is no enforced file size limit in the tool itself. The practical limit depends on your browser and device memory. Most modern browsers can comfortably handle files up to a few hundred megabytes.
About PDF Merger
The PDF Merger is one of the most useful free tools available online for anyone who regularly works with PDF documents. Whether you're combining scanned pages from a multi-function printer, assembling a report from multiple sections, or merging invoices for accounting purposes, our browser-based PDF Merger gets the job done instantly — without requiring any software installation.
Unlike desktop PDF software that often costs hundreds of dollars per year, Xplosole's PDF Merger is completely free and works on any device with a modern browser. It runs using the open-source pdf-lib library, which processes your documents locally using WebAssembly-accelerated JavaScript. This means your sensitive documents never travel over the internet — they stay on your computer throughout the entire process.
The reorder feature is especially useful when you're combining PDFs that weren't originally created in the right sequence. Simply use the up and down arrows to rearrange files before merging. The tool also displays the page count for each PDF so you can verify everything looks right before downloading the final merged document.
Common use cases for PDF merging include: combining bank statements into a single file for loan applications, assembling multi-chapter documents from separate files, merging scanned pages into a single PDF, combining presentations from different authors, and archiving multiple forms into one unified record. Whatever your use case, this tool handles it reliably.