Merge & Split PDF
Combine several PDF files into one document or extract page ranges – entirely in your browser, with no file ever leaving your computer.
100% in your browser
Your files are never uploaded. All processing happens locally on your device.
Merge PDFs
Add two or more PDF files, arrange them in the order you want, and combine them into a single document.
Add PDF files
Drag PDF files here or click to select
What does this PDF tool do?
The PDF merger and splitter from docutools.pro is a free online tool that lets you combine multiple PDF documents into a single file, or extract individual pages and page ranges from an existing PDF. It covers the two most common PDF tasks in everyday office work: bundling scattered documents and pulling out exactly the pages you want to share.
The key difference from many other online services is that this tool works entirely inside your browser. There is no server upload, no processing queue and no external storage. Once the page has loaded, all the logic runs locally on your machine – you could unplug your network cable and the tool would keep working.
For invoices, contracts, payslips or official documents, that is a genuine privacy advantage. Sensitive documents never leave your device, no temporary server copies are created, and you do not have to trust anyone to delete an uploaded file afterwards. This also makes the tool attractive for businesses that need to work in a GDPR-compliant way.
Technically, the tool is built on pdf-lib, a mature JavaScript library for reading and writing PDF files. It copies pages faithfully – including vector graphics, embedded fonts and text – so the resulting PDF is identical in quality to the source files and no re-compression takes place.
The tool is free and fully usable for typical tasks. If you regularly process large volumes, you benefit from the Pro perks: no file-count limit when merging, plus a batch mode that produces each page range as a separate file and conveniently bundles them into a ZIP archive.
How to use this tool
Whether you want to merge or split, both modes take just a few steps:
- Choose a mode — Switch between the “Merge” and “Split / Extract” tabs at the top depending on what you want to do.
- Add files — Drag your PDF files into the drop zone or click to select them. When merging, you can load several files at once.
- Arrange or set ranges — When merging, use the arrow buttons to put the files in the order you want. When splitting, enter the page ranges, such as “1-3, 5, 8-10”.
- Process — Click “Merge PDFs” or “Extract pages”. Processing runs instantly and entirely inside your browser.
- Download — Download the finished PDF. Pro users can enable batch mode when splitting and save all ranges bundled as a single ZIP file.
No registration and no installation required. The tool works in any modern browser on desktop and mobile.
How it works
When you select a PDF file, the browser reads it into an ArrayBuffer via the FileReader API – directly into your device's memory. No network request is made at any point; the file is never sent to docutools.pro or to a third party.
The pdf-lib library then parses the PDF structure. When merging, a new, empty PDF is created and the pages of each source file are copied into it one after another. When splitting, only the pages you specified are copied into a new document. Because pages are copied 1:1, fonts, images and vector graphics are preserved unchanged.
The finished PDF is generated as a byte stream in memory and delivered to you through a blob download. Encrypted or corrupted files are detected and rejected with a clear error message instead of producing a faulty result. Once you close the tab, all data is permanently removed from memory.
Common use cases
Bundle invoices and receipts
Combine individual monthly invoices, receipts or travel-expense documents into a single PDF for accounting or your tax office.
Build a job application
Merge your cover letter, CV and certificates into one continuous PDF – you control the order with the arrow buttons.
Share selected pages only
Extract just the relevant pages from a long contract or report without sending along confidential sections.
Split scans
Scanned several documents in one go? Split the combined PDF back into individual files – with Pro even bundled as a ZIP.
Example: specifying page ranges
When splitting, you enter the pages you need as a comma-separated list. Single pages and ranges can be combined freely:
Input: 1-3, 5, 8-10
Result: pages 1, 2, 3, 5, 8, 9 and 10
are copied into a new PDF
(7 pages in total).
Batch mode (Pro):
range 1-3 -> part-1.pdf
range 5 -> part-2.pdf
range 8-10 -> part-3.pdf
bundled as pdf-split.zipThe order of the ranges determines the order of the pages in the result. Duplicate pages are allowed.
Tips & limitations
Tips
- Arrange files before merging with the arrow buttons – the order in the list matches exactly the order in the resulting PDF.
- When splitting, you may list pages more than once or overlap ranges if you want certain pages repeated.
- Because everything runs locally, the tool is especially fast – there is no upload or waiting time, even with large files.
- Use Pro batch mode to split a combined scan into many individually named PDFs in a single step.
Limitations
- Password-protected or encrypted PDFs cannot be processed. Remove the protection first in your PDF software.
- The tool merges and extracts pages – it does not edit content, change text or compress images.
- Very large files are loaded entirely into memory; on devices with little RAM this can slow processing down.
- The free version merges up to 5 files per operation. More files and batch mode require Pro.
Frequently asked questions
Are my PDF files uploaded anywhere?
No. All processing happens exclusively in your browser. Your files are not sent to docutools.pro or to any third party, and no server copies are created.
How many PDFs can I merge at once?
The free version merges up to 5 files per operation – enough for most tasks. With a Pro account there is no limit on the number of files or their size.
Is the quality of my PDFs preserved?
Yes. Pages are copied faithfully, including fonts, vector graphics and images. No re-compression takes place, so the result is identical in quality to the source files.
How do I specify page ranges to extract?
Enter the pages you want as a comma-separated list. Single pages and ranges can be combined, for example “1-3, 5, 8-10”. The tool then extracts exactly those pages into a new PDF.
Can I split a PDF into multiple separate files?
Yes. With Pro batch mode, each specified page range is produced as a separate PDF file and all files are conveniently bundled into a ZIP archive for download.
Why won't my PDF load?
The most common reason is password protection or encryption. Such files cannot be processed – remove the protection first in your PDF software. Corrupted files are also rejected with an error message.
Does the tool work on a smartphone?
Yes. The tool runs in any modern browser on desktop, tablet and smartphone. Just note that very large files are processed more slowly on devices with little memory.
Does it cost anything to use?
No, the tool is free and fully usable for typical tasks. Pro merely removes the file limit and unlocks batch mode with ZIP download.
Can I change the order of pages when merging?
Yes. Each added file can be moved up or down with the arrow buttons. The order in the list matches exactly the order in the finished PDF.
Is my data stored after I close the tool?
No. All data lives only in your browser's volatile memory. As soon as you close the tab or reload the page, it is permanently removed.