Redeem keys without downloading
Related to Bulk activate product keys in Steam, I have the same problem with a lot of bundles (Humble Bundle is no longer a problem, but other sources have given me a crap ton of Steam codes that are tedious to redeem one at a time). In addition, redeeming a key automatically wants to start downloading the damn thing which I often don't want to do. Is it possible to add a key to Steam without needing to download it right away?
I want to have all the games I own on Steam, but I don't necessarily want to download them yet (or maybe ever). I have a problem now with keys scattered across various sources that I forget even which games I actually own!
Edit: Messing around with this it appears that @Lyrical is correct. There is no option to "not download", but you can cancel out before the download starts. One you get to this point, the game is added to your library:

But you can't actually cancel here (note cancel is greyed out), instead you have to hit "next" and then here:

You can actually hit cancel.
Best Answer
This is actually weird, because I thought they changed this. Mine hasn't auto-installed after key activation for over a year, but just started doing it again. It used to just add it to my Library and I'd have to go install it from there if I wanted to play it. Made redeeming bundles where I only want 1/3 of the games right now much easier to redeem. Just wish I could get it to go back to that behavior.
Right now it is even worse because if I redeem DLC for a game that isn't currently installed, it gives an error message, even though I didn't want to install it right now anyway. I don't even get to cancel, though it is added to my library.
Also, and definitely not a solution, but if you redeem a game from a system it can't be played on, like redeeming a Windows-only game from a Mac, it won't try to install it.
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How do I redeem a key code?
Redeeming Steam game codes in browser If you want to redeem a game key, you can't do it through the option listed above, in fact, you can't use the app to do so at all. Instead, you'll be logging into Steam through your mobile browser and redeeming the code online.Can you activate Steam keys on mobile?
No, you can not. It will say, "product already owned" and prompt you to install it or play it. Activating keys never gave users inventory games.What happens if you redeem a key for a game you already own?
Please follow these instructions to activate a new retail purchase on Steam:I Find 100 Redeem Code Online
More answers regarding redeem keys without downloading
Answer 2
You can redeem the key in your browser to add the item to your library without automatically downloading it:
Answer 3
As far as I know, redeeming keys prompts you with an option to download or not.
If this is not the case for you, you can always go to current downloads and cancel the download.
If you find that you have a game you do not want downloaded, merely right click it, select 'Properties', and select 'Delete local content'.
Answer 4
Is it possible to add a key to Steam without needing to download it right away?
Yes ! When you redeem a key, you have options opening to confirm and everything, and there is the option to not start the download right away.
If not, or if you can't find it, you can still cancel the download just after he started.
I want to have all the games I own on Steam, but I don't necessarily want to download them yet (or maybe ever).
Anyway, why would you want to redeem keys for games you don't even want to play ? Just keep the keys together and erase the ones already used. And if you want to play one, then redeem the key at this moment.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Kampus Production, Karolina Grabowska, Markus Winkler, Markus Winkler
