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Is there an OCR software that can convert a graphical image (in PNG, GIF, TIFF, PDF... format) of a mathematical formula into the corresponding TeX markup?

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Yes. There is one that I knew.

enter image description here

More details, see this link.

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The Mathpix app can convert pictures of printed and handwritten math and convert it to LaTex. The new Mathpix desktop app that was recently released lets you take a screenshot of the equation on your desktop and copies the LaTex to the clipboard so you can just paste it into your LaTex/markdown editor.

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  • It is also a Desktop app which takes screenshots and copies Latex to clipboard May 7 '18 at 6:11
  • @Sebastiano They also provide online version right now snip.mathpix.com/redstone-cold/notes/note-1/edit
    – iMath
    Mar 13 '20 at 3:00
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    @iMath Hi, and thank you for your comment. I have tried the online version but my humble opinion is that you can not copy many formulas but only some equations. Now I delete my old comment.
    – Sebastiano
    Mar 13 '20 at 11:38

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