When I first started using online PDF tools, I noticed a common pattern: every tool required uploading files to a server (Majority). It seemed harmless at first, but then I realized many of these files are sensitive. Contracts, invoices, tax forms, medical records… and yet we trust these files to anonymous servers.
That didn’t sit right with me.
So I started experimenting with client-side PDF processing: running all the logic entirely in the browser. That means:
- Files never leave your device
- No server ever touches your documents
- Everything happens locally, fast and securely
It’s not just a merger. On the site, you can now:
- Merge PDFs
- Split PDFs
- Compress PDFs
- Rearrange PDF pages
- Delete PDF pages
- Edit PDF metadata
- Full PDF editor and More...
Each tool runs directly in the browser, so your data stays private.
Building this taught me a lot about browser APIs, memory constraints, and performance optimization. It also made me think more about privacy-first design: how can web tools be convenient, but still keep sensitive data safe?
I wrote a detailed guide explaining the how and why behind these tools, including step-by-step instructions and technical insights:
👉 Check it out here -> https://aeropdf.app/blog/merge-pdf-securely-guide
I Would love to hear from other developers: Have you built privacy-first tools?
What challenges did you face keeping everything client-side?
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