VERT.sh
Open-source file conversion with the processing done on your device — images, audio and documents convert locally via WebAssembly with no size limits, no ads and no tracking; only heavy video jobs use a server. Ships a standalone PWA manifest with a full icon set, installing as a genuinely private converter app.

VERT.sh, as it opens in a browser tab.
Not sure how to add VERT.sh to your home screen? Step-by-step for Chrome, Safari, Firefox and Edge — it takes about ten seconds, and there is no app store involved.
Own VERT.sh? Have us re-run this measurement — we open it in a real browser, cut the network, and send you what survived.
How to install VERT.sh as a PWA
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Own a PWA? See the listing options — standard submission is free.