The standard grips this chord is usually shown with.
Ebm is Eb, Gb and Bb, a minor triad. The shape this page opens on is written xx1342, lowest string first.

Also written Ebmin, Eb- or Eb minor. The same chord either way; which spelling you meet depends on who wrote the chart.
There are 8 common shapes for Ebm on the guitar, and 44 derived voicings in the triad family.
In which keys. Every note of Ebm belongs to C# major (the ii), Eb minor (the i), F# major (the vi), Ab minor (the v), Bb minor (the iv) and B major (the iii).
The common shapes, written lowest string first: xx1342, xx4342, x6434x, x68876, x9887x, 11-9-8-8-x-11, 11-13-13-11-11-11, x-x-13-11-11-11.
Triad. Three notes across one string set. Ebm has 211xxx, 2113xx, xxx342, xx4342, xx434x, 664xxx, xxx876, x6887x.
The common shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.