The tool.
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The size of your game appears to be 0 MB (0 KB) (0 B).
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There are 0 MB (0 KB) (0 B) of empty space in your game.
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The real size of your game not including empty space is 0 MB (0 KB) (0 B).
About the tool.
When exporting a game, GB Studio appends empty space to the end of the file so that it matches GB cartridge sizes (either 128KB, 256KB, 512KB, 1.00MB, 2.00MB or 4.00MB). This has the annoying side effect of making it difficult to tell exactly how large your game is without the empty space added. There may also be some empty space within individual banks. You can use this tool to determine an approximation of your game's real size minus any empty space.
How to use.
Upload your .gb or .gbc file by clicking the Choose File button, then click the Check Size button. The tool runs locally and uploaded files never leave your computer, so you are the only person who can see them.
Tool by Shin. Thanks to 0xbbbbbr for help. Last updated 7/12/2023.