PDF Merger
No file size limitMerge multiple PDF files into one. Drag to reorder, then download. 100% free — all processing happens in your browser.
Click or drag PDF files here
Select multiple PDF files to merge — no file size limit
Frequently Asked Questions
Is there a file size limit for merging PDFs?
No. ToolsMani processes everything in your browser, so there is no server-side file size limit. You can merge PDFs of any size as long as your device has enough memory.
Are my PDF files uploaded to a server?
Never. Your files stay 100% on your device. All merging happens locally using the pdf-lib library running in your browser. Nothing is sent over the internet.
How many PDF files can I merge at once?
There is no hard limit. You can add as many PDFs as you need. Very large batches may take longer depending on your device.
Can I reorder the PDF files before merging?
Yes. Use the arrow buttons next to each file to move it up or down. The final merged PDF will follow the order shown.
Does PDF merging work on mobile?
Yes. The tool works on any modern browser including mobile browsers on iOS and Android. Large files may be slower on older devices.