Handoff: open-source delivery of finished work for freelancers

I'm a freelancer-minded dev and I kept running into the same problem: the work is done, and then sending the original files to a client turns into a mess of size limits, recompressed previews and expiring links.

So I built Handoff. It's an open-source desktop app (Windows first):

- You add the finished files to a project

- You create a private link (optional password, expiry, download limit, or view-only)

- Your client opens it in a browser, previews it, and downloads the original file

- No watermark, no recompression, nothing uploaded to a cloud. The files stay on your computer

Payment is between you and your client. Handoff doesn't touch it.

How clients reach you: same Wi-Fi, a temporary Cloudflare quick tunnel (downloaded only after you agree, checked against a pinned hash), your own address, or Tailscale Funnel.

Honest limits, because I'd want to know them:

- Your computer has to be on and online while the client opens the link

- It's v0.1. Only the Windows build is tested. macOS and Linux builds are prepared but I haven't run them

- Quick Share links are temporary, and view-only is a courtesy, not protection (the browser still receives the file)

- The build is unsigned, so Windows will show a SmartScreen warning

One bug that humbled me: 72 automated tests were green and my link still failed for every visitor on my phone. The web server trusted a forwarded-address header, so every visitor looked like an outsider and my own access rule blocked them. Fixed, with a regression test.

Code, MIT licensed: https://github.com/Suro026/HandOff

I'd love feedback from freelancers: how do you deliver large files today, and what would make you trust something like this?