Built from the pret decompilation. Bring your own cartridge dump.
.gba file here
Your file is read in this browser only. It is loaded into memory with the File API and handed straight to the emulator — there is no upload, no server call, and no copy kept on disk. Reload the page and you will be asked for it again. In-game saves are kept, in this browser.
Any other GBA file still boots — it is just not checked. The sha1 is computed locally with the Web Crypto API.