The srm to sav converter gbaconv compiled to WebAssembly. Converts libretro VBA-M and VBA-Next's srm save files and 44vba's 4gs (just a renamed srm) and 4gz (gzipped and encrypted 4gs) save files to sav. It can also convert sav to srm/4gs. 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.