About LocalPDFLab
Last updated: August 20, 2026
What LocalPDFLab is
LocalPDFLab is a free set of PDF tools, merging, splitting, compressing, converting, and more, that run entirely inside your web browser. There is no upload step, no account to create, and no subscription. You open a tool, drop in your file, and download the result. That is the whole product.
How it actually works
Every tool on this site is built with WebAssembly and JavaScript libraries that run locally on your device. When you drop a PDF into a tool, it is read directly by your browser and processed on your own computer or phone, usually inside a background Web Worker so the page stays responsive. The finished file is generated locally too, then offered to you as a download. At no point does the file, or any part of it, get sent to a server.
You do not have to take our word for it. Open your browser's developer tools, click the Network tab, and use any tool on this site. You will not see a request carrying your file anywhere.
Why we built it this way
A lot of PDF tools online work by uploading your file to a server, processing it there, and sending back the result. That is a reasonable way to build a product, but it means your document, which might be a contract, a medical form, a tax record, or anything else you would rather not hand to a stranger, has to leave your device. We wanted a version of these tools where that trade-off simply does not exist. Running everything client-side was the way to do that.
The tools
LocalPDFLab currently covers merging, splitting, organizing, and rotating PDFs, converting between PDF and JPG or PNG, compressing PDFs, adding page numbers, and adding watermarks. Browse the full list of PDF tools any time. More tools get added over time.
Open source, underneath
The tools on this site are built on open source libraries for PDF rendering and manipulation, running entirely in your browser. We are grateful to the maintainers of those projects. A full list of the libraries in use and their licenses is available on request through our contact LocalPDFLab.
Who is behind LocalPDFLab
LocalPDFLab is an independent project founded and developed by Alex T. It is not backed by a large company, and it is supported by advertising rather than a paid tier, so the tools stay free for everyone to use.
Questions or feedback
If something is not working the way it should, or you have an idea for a tool we should build next, we would like to hear about it. Reach out through our contact page.