Merge PDFs
Combine several PDFs into a single document: reorder the files, choose the pages to keep, and download the result. It is the quick way to send a contract, its annexes and a signature page as one file. The merge happens on your device and your documents are never uploaded.
- 100% local
- Free · no account
- Instant result
This tool runs entirely in your browser — nothing is sent to a server.
Merging several PDFs into a single document is one of the most common operations — and one of the ones for which confidential documents are most carelessly uploaded to unknown websites. Contracts, payslips, identity documents: these files have no business on a third-party server.
This tool merges your PDFs entirely in your browser. You add your files, reorder them, optionally choose the pages to keep in each, and download the final document. Nothing is sent, nothing is stored, and the tool keeps working once the connection is cut.
How it works
Type the figures or drop the file you want to process — the tool checks them as you go.
Everything is computed directly in your browser. Nothing is sent to a server.
The result appears instantly, with the detailed breakdown ready to copy, download or keep.
Why use this tool
No account, no download, no limit: the result appears as soon as you enter your data.
Every rule, algorithm and check reflects what we use ourselves every day at Flexina.
The calculations follow the official standards, and the step-by-step detail lets you double-check the outcome.
What does running it locally bring you?
Files, figures and documents never leave your device: nothing is stored, nothing is sent.
Once the page is loaded, you can cut the network: the tool keeps working.
No upload, no account, no third-party server in between: results stay fast and fully private.
Frequently asked questions
Are my documents uploaded to a server?
No, never. The merge is performed in JavaScript in your browser. You can cut your internet connection after the page loads: the tool keeps working.
Is there a limit to the number or size of files?
No limit imposed by the tool: the only constraint is the available memory of your browser. Documents of several hundred pages process without difficulty; on mobile, stay reasonable.
Is the quality of the documents preserved?
Yes. The pages are copied as they are, without recompression: the text stays selectable, the images keep their resolution and the fonts are preserved.
Why is my PDF rejected?
A PDF protected by a password cannot be opened without it. Remove the protection from the software that created it, then retry. A corrupt file, or one that is not actually a PDF, will also be flagged.