I use Aseprite. If you're looking for a free tool to get into pixel art, I recommend piskelapp.com, as it's what I used for something like five years. Source: over 1 year ago

You could use piskel and import that image as a spritesheet, tell it each asset size and export each one individually, not sure how other do this there's probably a better way. Source: almost 2 years ago

I don't use sprite, but I did use a tool for the transition of colors. I use a site known as piskel where they have a built in dithering tool. Source: almost 2 years ago

Each NFT is 1/50 and were created live on stream at twitch.tv/Jomigloy. These were created using a combination of piskelapp.com and Aseprite. Each NFT is 132 frames and I had a blast making them. With this project I'm trying to evoke feelings of nostalgia with the machine base, and the screen allows me to convey a message. In this case, I'm spreading Loopring hype on these screens. The last few weeks collecting L2... Source: about 2 years ago

Ooh, what website? I know piskelapp.com (I love that site) lets you save to keep working on it later or export to create a video file, but if you're using another one I'd love to check it out! Source: about 2 years ago

Cubik Studio: The second most famous, really good but not free. Source: about 2 years ago