Arrange and merge PDF pages
A private alternative to iLovePDF.
Nothing is uploaded. docstack merges, arranges and redacts PDFs on this device, and its code is open source.
or drop PDFs, images, PowerPoint or Word files anywhere on this page
Reorder · Rotate · Delete · Redact · Merge
Arrow keys move between pages. Shift with an arrow key extends the selection. Space or Enter opens a page. Alt with an arrow key moves the selected pages.
An open source alternative to iLovePDF
iLovePDF is a large set of online PDF tools that work on files you upload. docstack does fewer things, and does them on your device: the files you add are never sent to a server. Here is how the two compare.
| docstack | iLovePDF | |
|---|---|---|
| Where files go | Nowhere. They are opened and merged in your browser tab. | To its servers. iLovePDF says files are deleted within two hours of being processed. |
| Offline | PDFs and images keep working once the page has loaded. | The website needs a connection. There is a separate desktop app. |
| Price | Free. There is no paid plan. | Free with limits on processing and file size. A paid plan removes them. |
| Source code | Open source under the MIT License. | Not open source. |
| Tools | Merge, reorder, rotate, delete, insert, extract and redact pages. Converts images, Word and PowerPoint to PDF. | Many more, including compress, split, PDF to Word, OCR and signing. |
Details about iLovePDF are from its own help and pricing pages in October 2026 and may have changed.
Which one to use
- Use docstack
- When the document is private, when you want to see and arrange every page before merging, or when you would rather not upload anything.
- Use iLovePDF
- When you need something docstack does not do, such as compressing a PDF, converting a PDF to Word, running OCR or collecting signatures.
- Not included
- docstack does not compress PDFs, split one into several files in a single step, convert PDFs into other formats, recognise text in scans or sign documents.
Your files stay on your device
Many online PDF tools upload your files to a server to work on them. docstack does the work in this browser tab instead: files are opened, converted, arranged and merged on your device, and no file or page is sent anywhere. There are no analytics and no trackers.
You can check this yourself. Once the page has loaded, turn off Wi‑Fi and keep working: PDFs and images still open, rearrange and download.
There is one download to know about. The first time you add a PowerPoint or Word file, your browser fetches the tool that converts it (about 50 MB) from ZetaOffice. The file itself is still converted on your device.
Common questions
Is docstack connected with iLovePDF?
No. docstack is an independent open source project and has no connection with iLovePDF.
Is an online PDF tool safe for private documents?
It depends on where the work happens. A tool that uploads your file asks you to trust how it is stored and deleted. docstack never receives the file, so that question does not come up.
Can I check that nothing is uploaded?
Yes. Turn off Wi‑Fi after the page has loaded and keep working, or read the code on GitHub.
Does docstack limit file size?
There is no set limit. Your files are held in your browser's memory, so how much it can handle depends on your device.