Which cheap mods can i make to my keyboard to make it quieter?

As suggested by the other commenter, o-rings are the best cheap solution.

Another option that works if your keyboard has a hollow body is sound-dampening insulation inside the frame.

I have a Kinesis Advantage that has a ton of negative space inside and simply putting some non-conductive foam inside the shell made a huge difference in the amount of noise it makes

Deskmat under the keyboard

Tape and/or foam mods in the case (will change the pitch of the sound, which might disturb less)

O-rings, but these will change how they keyboard feels. I didn't like them

Foam inserts for keycaps - like o-rings but foam. never tried them

Lubricating the stabilizers - should mitigate some space and enter key rattle

If your keyboard supports hotswap, new switches are a more expensive option.

Edit: The person who invented markdown WYSIWYG text editors is on my shit list

cheapest and easiest mod is probably o-rings

Keyboard O-RINGS: Installation & Sound Test (good or nah??)

changing out switches can also be relatively easy but can def be more costly

Depends on your board. I had a Redragon K530, here are the list of mods I applied to it in order of price:

• Put foam on the bottom (the type of foams that come with PC components works great), stuff like this
• Added O-rings
• Replaced the switches with Redragon A113 Bullet-QT soft tactile

I think the switches made the biggest impact, but that's also the most expensive and it requires your board to be hot swappable.

If you are using choc switches, the new ambients are made to be silent, and so far it has worked great for me

If you are using it on a hard surface, consider placing a mat under your keyboard, it'll dampen the sound of keystroke.