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I am using Gimp or Krita, I'm learning to use them yet, thanks for the answer, I'll search more about it.

In Gimp you can use "Image" -> "Scale Image..." and then in a popup window choose "Interpolation" to be "None" and resize e.g. 300% or whatever you like..

In Krita you can use "Image" -> "Scale Image To New Size..." and then in a popup window choose "Filter" to be "Box" and resize e.g. 300% or whatever you like.

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It worked for both, thank you very much. You recommend some tutorial for pixel art ?

I'm glad  it helped.

No idea for a pixel tutorial; but I recommend limiting yourself: small resolution (like 16x16 or even 8x8), few colours (2-5) - it's easier to get decent results.