UlvixorMerge PDF (File Combiner)
Select several PDF files, reorder them however you like with the up/down arrows, and combine them into a single document with one click. The whole process happens in your browser with pdf-lib: your files are never uploaded to any server.
How it works
- Select two or more PDF files from your device (you can add more files afterward with the same picker).
- Each file is read locally and shown in a list with its name and page count.
- Reorder the list with the up/down arrows or remove files you don't want to include; that becomes the final order they'll be combined in.
- When you click 'Merge PDFs', pdf-lib copies the pages from each file, in order, into a new PDF document.
- Download the combined PDF with a single click as merged-document.pdf.
Use cases
- Combine several loose scans (contract, attachments, ID) into a single PDF to send by email.
- Merge chapters or sections of a long document that were generated as separate PDF files.
- Combine individual invoices or receipts into a single file before archiving them.
- Reorder and combine reports from different collaborators into a single deliverable.
Use cases
- Combine several loose scans (contract, attachments, ID) into a single PDF to send by email.
- Merge chapters or sections of a long document that were generated as separate PDF files.
- Combine individual invoices or receipts into a single file before archiving them.
- Reorder and combine reports from different collaborators into a single deliverable.
Common mistakes
- Trying to merge with only one file loaded and not understanding why the button is disabled.At least 2 valid PDF files are needed to merge. Add another file with the same picker; the 'Merge PDFs' button enables automatically once you reach two.
- Expecting navigation bookmarks or interactive form fields to carry over the same way into the merged PDF.The tool correctly copies each page's visual content (text, images), but elements like bookmarks or interactive forms may not transfer the same way into the final document.
- Assuming the files merge in the order they were selected, without checking the list.The final order depends on how the files are arranged in the list, not the selection order. Use the up/down arrows to confirm the sequence before merging.
Frequently asked questions
No. All files are read and combined entirely in your browser using the pdf-lib library. They are never sent to an external server or stored anywhere.
Yes. Each file appears in a list with buttons to move it up or down, and another to remove it. The combined PDF follows exactly the order the files end up in on that list.
You need at least 2 valid PDF files to combine them; the 'Merge PDFs' button stays disabled until there are at least two in the list.
That specific file is automatically skipped during merging, and you're told which one it was and why it failed, but the rest of the valid files are combined normally. If every file fails, no PDF is generated.
The pages are preserved as they are (including their visual content, text, and images), but elements like navigation bookmarks or interactive form fields may not carry over the same way into the combined document, since this tool focuses on copying page content.
Alternatives
Adobe Acrobat, or system tools like the Preview app on macOS (dragging pages between documents), also let you merge PDFs. This tool is convenient for doing it quickly and for free from any operating system, with nothing to install and no potentially confidential documents uploaded to an external server.