About PDF Merger
PDF Merger is a focused web app for combining PDF files. The site is named PDF Merger. You upload two or more documents, arrange them, and download a single PDF. There is no signup, no desktop installer, and no extra PDF toolkit competing for attention on the same screen.
How the product is built
The website is an ASP.NET Core Razor Pages application. Merging happens in the same process using PDFsharp, which imports pages from each source file. That approach preserves the original page content instead of printing the PDF to a new raster image.
The interface uses only first-party CSS and JavaScript. There are no front-end UI kits, no third-party analytics scripts in the default configuration, and no overlay that covers the page. That keeps the tool light and avoids interfering with advertising scripts you may enable later.
Who it is for
Students assembling coursework, operations teams collecting signed PDFs, and anyone who needs a clean packet for email or records can use the workbench. If your files are already PDFs and you only need them in one document, this is the shortest path.
Limits you should know
Shared hosting has finite CPU and memory. The published limits (file count, size per file, and total upload) exist so merges stay predictable. Password-protected PDFs are not accepted. Very unusual or damaged files may fail; the error message will tell you to remove the problem file and try again.