Organize PDF
Merge PDF
Join several PDFs into one document in the order you upload them.
Runs entirely in your browser — the file never leaves this device
100% FREE
No subscription required
COMPLETELY PRIVATE
Your files are never uploaded anywhere
CLIENT-SIDE PROCESSING
All conversions happen in your browser only
YOUR DATA IS YOURS
We process everything locally on your device
Drop your files here
or click to choose from your device
Select filesAbout Merge PDF
Join contracts, chapters or scanned pages into one document, in the order you choose.
How to use Merge PDF
- 1Click "Select files" or drag and drop several PDF files into the box above.
- 2Press "Run Merge PDF". The conversion runs on your own device, usually in a few seconds.
- 3Download one combined PDF. Nothing is uploaded or stored on any server.
Tips for the best result
- Files are merged in the order shown in the list — remove and re-add a file to move it.
- Password-protected files must be unlocked first.
Frequently asked questions
Is there a limit to how many PDFs I can merge?
No fixed limit — it depends on your device's memory. Hundreds of pages are fine on most computers.
Is the Merge PDF tool free?
Yes. It is completely free, with no sign-up, no watermark and no daily limit.
Are my files uploaded to a server?
No. FlashFile processes your files entirely inside your browser, so they never leave your device.
Is there a file size limit?
There is no fixed limit. Files up to about 200 MB work on most computers; very large files depend on your device memory.