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We suppose that I put my signature on a piece of white paper with my first and last name on it. After I execute a scan of this signature in .pdf, or .png or .tiff, etc. (as file image).

What are the steps of a specific software to select only the signature, make the background transparent so that I can move it in a word document using only free tools on line without sign in or registration?

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    If you have access to Photoshop and a scan of the signature, this will give you good results and keep anti-aliasing intact: graphicdesign.stackexchange.com/a/29545/18168 – curious Aug 2 '19 at 16:47
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    It's a bit of a complex process but it's been a life-saver of mine for years :) – curious Aug 2 '19 at 18:42
  • @curious Is it possible to reopen, please, my question? Thank you very much. – Sebastiano 5 mins ago
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Use GIMP. Open your file. If it's not RGB, change the mode to RGB (=Image > Mode > RGB).

Insert alpha channel, if it does not already exist. Goto Layer > Transparency. Option "Add alpha channel" is grayed, if there's already one.

Increase the contrast with Color > Curves so that paper is full white. Adjust the hue and saturation of the writing good after the paper is white. Do it with Colors > Hue-Saturation. Be sure you do not make the background grey.

You should have a single layer image:

enter image description here

(the text here is random jumble scratched with the mouse, it's not readable writing in any language)

Then set the current foreground drawing color to white and apply Color > Color to alpha. White changes to transparency:

enter image description here

Then export your image as PNG. It may be a good idea at first check it has the right print size and resolution (300dpi). For it goto Image > Print Size.

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