Root on A string
x6787x
E♭dim is the E♭ diminished chord. Its notes are E♭, G♭ and B♭♭. It is the same chord as D♯dim. A compact, tense triad. Every interval in this voicing is a chord tone.
x6787x
Numbers show frets from the low E string to the high e string; x means don't play that string.
E♭dim is the vii° chord in E major. That makes it a natural fit in songs written in those keys.
Every E♭, G♭ and B♭♭ on the first 12 frets. The filled dots are the root, E♭. Build your own shape from any nearby group.
Other E♭ chords
Other diminished chords