The Libretro VBA save to standard sav converter gbaconv compiled to WebAssembly. Converts libretro VBA-M and VBA-Next's save files and 44vba's 4gs and 4gz (gzipped and encrypted 4gs) save files to sav. It can also convert sav to Libretro VBA format. gbaconv was originally written by libretro contributors. More info on VBA save formats here.
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Build gbaconv-web.c by running emcc -O3 gbaconv-web.c -o gbaconv-web.js -sEXPORTED_RUNTIME_METHODS=ccall,cwrap,UTF8ToString in a linux terminal with emscripten installed.