PDF Merger
Select two or more PDF files from your device, reorder them, and merge them into a single PDF. Everything happens entirely in your browser — your files are never uploaded to a server, which is both faster and more private.
Save your student profile to track computations, past questions & GPA targets.
PDF merger
How It Works
Each PDF you select is read directly in your browser using pdf-lib, an open-source PDF library. Its pages are copied in the order you choose into a brand-new PDF document, which is then assembled and offered to you as a download — the original files never leave your device.
MyDelsu is an independent student platform and is not affiliated with DELSU administration. This tool is provided for guidance only — always verify results against your official transcript, result slip, or academic regulations.
This tool runs entirely in your browser — your file is selected locally on your device and is never uploaded to a server. Nothing leaves your device at any point.
You select files locally from your device (this is a local file selection, not a server upload) — the merge itself also happens on your device.
Frequently Asked Questions
Is my file uploaded anywhere?+
No — everything happens locally in your browser. Your PDFs are never sent to a server.
How many PDFs can I merge at once?+
You can add as many as you like up to a combined total of 50MB. Larger batches may take a little longer to process since it all happens on your device.
Can I change the order of the pages?+
Yes — use the up/down arrows next to each file to reorder them before merging. Pages are added to the merged PDF in that order.
What if one of my files isn't a real PDF?+
The tool checks each file's actual content, not just its name or extension. If a file can't be read as a valid PDF, it's skipped and you'll see a clear message telling you which one and why.