Add PDFs and drag to reorder before combining — merging happens entirely in your browser and your files are never uploaded.
Advanced options
How it works
- Drag any row (⠿) to reorder, or use ↑ / ↓ — the merge follows the order shown top to bottom. Quick sort by filename and reverse buttons handle bulk reordering.
- Page ranges: each file has a page range box. Leave it blank to include the whole document, or enter something like
1-3,7to merge only those pages from that file. - Insert blank page adds a separator page between each source document — useful when the merged PDF will be printed double-sided.
- Add files in multiple batches; each new selection is appended rather than replacing what's already there.
- A short ad plays before your download starts — it helps keep this tool free.
- All processing happens locally in your browser using pdf-lib — your files are never uploaded anywhere.
About merging PDF files
Merging combines several PDF files into a single document, in the order you choose. It's one of the most common PDF tasks — stitching a cover letter, a CV and a certificate into one file to send, or joining scanned pages that arrived separately.
This tool merges entirely in your browser. Your files are never uploaded to a server, which matters when you're combining contracts, statements or anything personal.
Common uses
- Combining a multi-part application or submission into one file.
- Joining separately scanned pages back into a single document.
- Assembling a report from several exported sections.
- Putting an invoice and its supporting receipts together before sending.
Use it carefully
Merging copies the pages as-is — it doesn't re-check their content, so make sure each file is the right version before you combine them. Keep your original files until you've confirmed the merged result is correct, and remember that any interactive form fields or digital signatures in the sources may not survive a merge.
Understanding your results
The output is a single PDF containing every page of your input files, one after another, in the order shown on screen. You can reorder files before merging; the page order inside each file is preserved.
The merged file downloads to your device with a name you can change. Its size is roughly the sum of the inputs — merging doesn't compress, so if the result is large, run it through the PDF compressor afterwards.
Are my files uploaded anywhere?
No. The merge happens in your browser and your files never leave your device.
Can I change the order of the files?
Yes — reorder them before merging and the final document follows that order.
Is there a size or file-count limit?
It's limited only by your device's memory. Very large files may be slow on an older phone.
Combining documents in the order you choose
Merging places the pages of several PDFs one after another into a single file. The order matters: the tool keeps files in the order you arrange them, and within each file the pages stay in their original sequence unless you edit them. Dragging files into the right order before merging is usually all the organisation you need.
Why the merged file can be larger
The combined file is roughly the sum of the parts, because every page's content is carried over. Merging doesn't re-compress anything, so if you add three image-heavy PDFs, the result carries all of that image data. If size matters, compress the pieces first or the result afterward.
Picking exact pages
You don't have to merge whole files. Using the page editor you can select specific pages, drop the ones you don't want, and even rotate individual pages before they're combined — useful when only part of each source document belongs in the final file.
A practical example
Suppose you have a cover letter, a two-page form, and a scanned ID. Merge them in that order and you get a single document ready to send, instead of three separate attachments the recipient has to open one by one.
Why PDF made merging practical
PDF's page-oriented structure lets complete pages from different documents be assembled into one ordered document while largely preserving their appearance.
Merging does not automatically compress
Combining a 2 MB and 3 MB PDF does not imply a tiny output. The resulting document still needs to contain the resources required by both sources, though shared/optimized resources can affect the exact size.