Answered Question

FilthyGorilla

Local Legend
There is no way to play Stardew Valley without downloading it onto your computer; it's not a game you can play on your browser.
Just adding onto what Xander said, downloading shouldn't be too much of an issue if you're wondering about storage space, as the game barely takes more than 1-2 Gigabytes as far as I remember.
 

Homi

Newcomer
Stardew Valley doesn’t have an official browser version, so you generally can’t play it on a computer without downloading or installing it. The safest options are Steam, GOG, or the Microsoft Store. You may also be able to stream it through a supported cloud-gaming service, but availability depends on your country and the service.
 
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