OfflineConvert is a collection of free file converters — images, subtitles, fonts and data — that run entirely in your browser using WebAssembly and native browser APIs. There is no upload step, no queue, no account, and no server that ever sees your files. After a page loads, most tools keep working with your internet connection switched off; that's where the name comes from.
The project exists because the standard online-converter model quietly asks for a lot of trust: your photos, licensed fonts, subtitle scripts or customer spreadsheets get copied to someone else's computer, processed there, and retained under whatever policy applies that week. Modern browsers are powerful enough to make that trade unnecessary — so we skip it entirely, and we show you how to verify that claim yourself with your browser's network tab.
Every tool page explains its format pair honestly, including the cases where you shouldn't convert. The heavy lifting relies on excellent open-source software — see the credits on the How it works page. Found a bug or missing tool? Tell us.