UsefulTab
Merge to PDF
Combine PDFs and images into one PDF, in order.
Add PDFs or images to merge them into one PDF
Add PDF files and images, put them in order with the arrows, then Merge. Every file is read in your browser and combined into a single PDF you can download — your originals never leave your device.
Runs entirely in your browserEnjoying this tool?
UsefulTab is free, with no sign-up and no limits. If it saved you some time, you can treat me to something small from my wishlist — totally optional.
Merge PDFs and images into one PDF, locally
Drop in any mix of PDF files and images — JPG, PNG, or WebP — arrange them in the order you want, and this tool stitches them into a single PDF. Each PDF's pages are appended in place and each image becomes its own page. You can keep every page at its original size or fit everything to a standard A4 or US Letter sheet. Your files are read and combined entirely in your browser and are never uploaded to any server.
Common questions
How do I merge PDF files into one?
Drop your PDFs here, put them in the order you want with the up and down arrows, and click Merge. The pages of every PDF are appended in that order into one new PDF you download — all in your browser, with no account.
Can I combine images and PDFs together?
Yes. Add any mix of PDF, JPG, PNG, and WebP files. Each image becomes one page and each PDF contributes all of its pages, in the order you arrange them.
Can I change the order of the files?
Yes. Use the up and down arrows on each file in the list to move it earlier or later. The final PDF follows the order shown top to bottom.
Is there a file-size limit?
There is no fixed limit — nothing is uploaded, so the only cap is your device's memory. All the files are held in your browser tab while merging, so the tool warns you when a batch passes 300 MB in total. If a merge runs out of memory, your files stay in the list so you can merge them in smaller batches. You can cancel a long merge at any time.
Does it work on mobile?
Yes. It runs in any modern mobile browser just like on desktop, since all the work happens on your device. A large batch is more likely to strain memory on a phone than on a computer.
Are my files uploaded, and are the originals changed?
No to both. Everything happens in your browser tab using the pdf-lib library loaded on your device — nothing is sent to a server. Your source files are only read, never modified; the merge produces a brand-new merged.pdf you download separately.