Enhancing png signatures - General Questions - Krita Artists

I was asigned a duty to make a design for T-shirts for the end of elementary/junior high school and I had to put our signatures on the back, so I took a graphic tablet and saved all people’s signatures as png. Now some of them have too narrow font and if I want it to be visible when printed on the shirts I have to make them more thick. Does anyone know how to make lines more thick (not necessary in krita) and would help me with this?

Common Workflows — Krita Manual 5.2.0 문서

Reddit Promotion - SONO for Artists

Common Workflows — Krita Manual 5.2.0 문서

Krita Stabilizer Learn How to Use Stabilizer in Krita?

Common Workflows — Krita Manual 5.2.0 문서

Gray PNG`s - General Questions - Krita Artists

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Digital Art Therapy Exercise Using iPad or Tablet — Thirsty For Art

Smudging with fingers sounds cool, right? Here's how to turn on