No blank is completely safe, but since our blanks have no projectiles they are safer than live ammo. The pressure escaping the end of a barrel when a blank is fired can still be dangerous, so precautions should still be taken. Eye and ear protection should always be worn.
Some blanks may be labeled as “open” or “wadded” which means they have a small cardboard or Styrofoam disc that compacts and holds the powder in the blank known as a blank wad. This wad is made to disintegrate when the blank is fired so it does not become a projectile.