How to Convert guitar tab to mt. dulcimer
General mountain dulcimer or music discussions
If you mean tabs for guitar chords, you can go to a website like ultimate-guitar.com then find a song you like. For example here is a link to 'Leaving on a Jet Plane by John Denver"
https://tabs.ultimate-guitar.com/tab/john-denver/leaving-on-a-jet-plane-chords-32979
at the bottom of the screen you will see a white box that reads
"FONT -1+1 CHORDS AUTOSCROLL TRANSPOSE -1 +1"
you can transpose the tabs to a key that is better suited to your dulcimer by clicking on the +1 to transpose it up a half step or the -1 to transpose it down a half step. For example if you found tabs in the key of E, but your dulcimer is tuned to D, you could click the '-1' button twice.
This chart might then help to translate the chords into dulcimer chords https://everythingdulcimer.com/tab/chord_chart_dad_major.pdf
I don't know of a way to directly convert the kind of tabs which show all 6 strings, other than to just convert those tabs into their notes, then convert those notes into dulcimer tabs. This can be quicker than you might think with a chart like this
As Lisa mentioned, your biggest obstacle at that point is the chromatic frets, which might not be a problem at all if your dulcimer has a lot of frets. Quite a lot of pop music is mostly diatonic so if you are willing to put in the time to translate the guitar tabs into their notes, then transpose those notes into a key you can play on your dulcimer, a lot of times its very rewarding, but sometimes it can be fruitless if you dont have the frets you need.
Hope this helps
-Nate