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Combine any number of PDFs into one document, in the order you choose.
On your device. No watermark. No sign-up.
This tool is processed locally with JavaScript inside your browser tab. The document is not uploaded, stored or seen by a server, which makes it suitable for contracts, invoices, CVs and medical or financial records.
Files are merged from top to bottom, exactly as they appear in the list. Use the up and down arrows to move a file, the cross to remove it, and Clear list to start again. The pages inside each file keep their own order.
Check the list after you add files. When you pick several files at once, the order your browser hands them over in is not always the order you expect, and the tool keeps that order until you change it.
You can add the same file twice if you want its pages to repeat, for example a cover sheet at the start and at the end.
Merging copies the pages as they are. Nothing is redrawn or re-compressed, so text stays selectable, images keep their quality and links on the pages still work.
Each page keeps its own size. If you merge an A4 file with a Letter file, the result contains both sizes. Run the merged file through Resize Pages afterwards if you need every page the same.
The merged file is built on the first PDF in the list, so document properties such as the title and author come from that file. The other files add pages only. You can change the properties afterwards with Edit Metadata.
Fillable form fields are not carried over as working fields. Fill in and finish any form before you merge it, then check the merged file.
A PDF that needs a password to open cannot be merged. Unlock it first with Remove Password, using the password you already have. A PDF that opens normally but blocks printing or copying counts as locked too, so run it through Unlock PDF first.
When a file cannot be read, the tool names it and tells you which tool to use: Remove Password for a file that needs a password, Unlock PDF for one that blocks printing or copying. If it says a file does not look like a valid PDF, the file may be damaged, and Repair PDF can often rebuild it.
Only PDFs can be added. Word files, spreadsheets and images are skipped. Convert Word files with Word to PDF and photos with Images to PDF, then merge the results.
Many portals accept one PDF only, often with a size limit. Put the documents in the order the form asks for, merge once, and compress the single result at the end. Compressing each file first and merging afterwards loses quality twice.
Before you merge, rotate any sideways scans with Rotate PDF and remove blank pages with Delete Pages. The guide on merging a PDF for a job application lists the usual order of documents.
The merged file is about as large as the files you put in, because nothing is compressed. Ten 5 MB scans make a file of roughly 50 MB. If that is too big to email or upload, run it through Compress PDF afterwards.
There is no limit on the number of files and no file size cap set by a server. All the files are held in your device memory while they merge, so the practical limit is memory: about 100–200 MB in total on most desktops, and less on a phone.
Merging happens inside this browser tab with the pdf-lib library. The files are read from your disk, combined in memory and saved back to your downloads. They are never sent to a server, so the tool is safe for contracts, bank statements and ID documents. After your first visit it also works offline.
No. There is no limit on the number of files and no size cap set by a server. The practical limit is your device memory, about 100–200 MB in total on most desktops.
No. The files are merged inside your browser and never leave your device. After your first visit the tool works offline too.
No. Pages are copied as they are. Nothing is re-compressed or turned into images, and text stays selectable.
Use the up and down arrows next to each file before you press Merge. To reorder single pages inside a merged file, use Organize Pages.
Yes. Each page keeps its own size. Use Resize Pages afterwards if you want every page the same size.
The message names the file. If it needs a password, unlock it with Remove Password. If it blocks printing or copying, use Unlock PDF. If it says the file is not a valid PDF, the file may be damaged, so try Repair PDF.
Not directly. Remove the password first with Remove Password, using the password you already have, then merge the unlocked copy. You can add a password to the merged file afterwards with Encrypt PDF.
Convert them to PDF first. Use Word to PDF for documents and Images to PDF for photos, then add the results to the list.
Merge adds every page of each file. Use Extract Pages or Delete Pages first to keep only the pages you need, then merge.
Run it through Compress PDF. Safe mode keeps the text selectable, and Target size works towards a limit in KB if a website asks for one.
Yes, in Chrome, Safari and other mobile browsers. Large sets of files are easier on a desktop because everything is processed on the device.
Last updated 12 November 2026
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