No, legginess is a sign of too little light, so you’ll want to move them to a brighter spot, if possible. A sunny window, or even a not-so-sunny window and some supplemental lighting should help. Pinching them back will likely stunt their growth or even kill them at this point, so refrain from doing that!
Depending on what kind of plant they are, it may be time to replant them in larger pots. Leggy tomato seedlings, for example, can be planted about halfway up to their leaves, as new roots will sprout from the stem. This is not the case for most other seedlings, though.
No, legginess is a sign of too little light, so you’ll want to move them to a brighter spot, if possible. A sunny window, or even a not-so-sunny window and some supplemental lighting should help. Pinching them back will likely stunt their growth or even kill them at this point, so refrain from doing that!
Depending on what kind of plant they are, it may be time to replant them in larger pots. Leggy tomato seedlings, for example, can be planted about halfway up to their leaves, as new roots will sprout from the stem. This is not the case for most other seedlings, though.