Merge PDF

How to merge PDF files

1. Drop your PDFs onto the box, or click it and select several files at once. Each file shows its page count as soon as it is read.
2. Use the arrow buttons to put the files in the order you want them to appear. The number on the left is the final position.
3. Remove anything you added by mistake with the cross button.
4. Press Merge PDFs. The combined file, named merged.pdf, downloads automatically and stays available through the download button until you clear the list.

Pages are copied exactly as they are: text stays selectable, vector drawings stay sharp, and existing bookmarks within each page are preserved. The tool does not rasterise anything, so a 300-page merge is quick even on a phone.

Why merge in the browser?

Uploading a signed agreement, an ID proof or a bank statement to a random server is a real risk — you have no idea how long the copy is kept or who can read it. This tool loads the pdf-lib JavaScript library once and does all the work on your device. You can even switch off your internet connection after the page has loaded and it will still merge.

There is no artificial size limit, no watermark and no “premium” queue. The practical limit is your device’s memory: merging a few hundred megabytes of scanned pages works on a laptop but may struggle on a budget phone.

Ordering tips

• File names are not the order. Files often arrive in the order your file picker returned them, which may be alphabetical or by date. Check the list before merging.
• Cover pages and indexes. Add them as separate PDFs and move them to the top; the tool does not care how many pages a file has.
• Mixed page sizes (A4 statements plus an A5 receipt, say) merge fine. Each page keeps its own size and orientation.

What the tool cannot do

• Encrypted PDFs. If a file is password protected, the tool reports it instead of merging a locked document. Open the file in a viewer, print it to a new PDF or remove the password, then add it again.
• Corrupt files. Some “PDFs” are renamed images or truncated downloads. These are flagged in the list; the rest of your files can still be merged.
• Form fields with the same name across documents may behave oddly after merging, because PDF requires field names to be unique. Flatten forms first if you rely on them.
• Selective pages. Merging always takes every page of every file. To include only some pages, run the file through the Split PDF tool first and merge the extract.

Typical uses

Combining scanned Aadhaar, PAN and address proof into one KYC document; assembling chapters of a report written by different people; stitching monthly invoices into a single file for your accountant; or turning a set of photographed pages into one submission for a college portal that accepts only a single upload.

Frequently asked questions