Why Merge PDFs in Your Browser?
Most online PDF mergers upload your documents to their servers, which is a real privacy risk for contracts, bank statements, ID scans and medical records. ToolsFlash uses the open-source pdf-lib library to merge PDFs entirely on your device — your files are never transmitted anywhere, and there is nothing for anyone to store or leak.
Common uses
- Combining scanned pages into one document
- Assembling reports, invoices or portfolios
- Joining application forms with supporting documents
- Bundling receipts for expense claims
Have photos instead of PDFs? Use Images to PDF first, then merge the result with your other documents.
Frequently Asked Questions
Are my PDF files uploaded to a server?
No. Merging happens entirely in your browser using JavaScript. Your documents never leave your device, so this tool is safe for contracts, statements and other sensitive files.
Can I change the order of the PDFs before merging?
Yes. Use the up and down arrows next to each file to arrange them. The merged PDF follows the order shown in the list, top to bottom.
Is there a file size or count limit?
There is no hard limit, but very large files depend on your device's memory. Merging typical documents of up to a few hundred pages works smoothly on most devices.
Can I merge password-protected PDFs?
Encrypted or password-protected PDFs can't be merged. Remove the password first using your PDF reader's export or print-to-PDF feature, then merge.