How to Drill Into Tile Without Cracking It

Tile looks like masonry, so it's tempting to grab the same hammer drill and carbide bit you'd use on brick or concrete. That combination is exactly how a bathroom tile ends up with a spiderweb crack radiating out from a single hole meant for a towel bar bracket.

Tile cracks under drilling for a specific, avoidable reason: it's thin, brittle, and bonded to a hard backer with almost no give. The fix isn't a stronger drill — it's a different bit, a slower approach, and skipping the hammer action entirely.

Why tile cracks when brick and concrete don't

Brick and concrete are thick and can absorb the repeated hammering impact a masonry bit relies on to pulverize material ahead of it. Tile is a thin, glazed, brittle surface with almost no thickness to flex or absorb that shock, so the same hammering action that works great on a concrete anchor hole tends to shatter tile outward from the bit instead of drilling through it cleanly.

Glazed ceramic and porcelain also have a hard, glass-like surface layer that a standard masonry bit's carbide tip isn't ground to grip. Instead of biting in, the bit skates across the glaze, wanders, and chips the surface before it ever gets a clean start.

Use the right bit for the tile type

For glazed ceramic tile, a carbide-tipped spear-point bit (often sold as a "glass and tile" bit) is the standard choice — the spear-shaped tip scores through the glaze and tile body without the hammering action a masonry bit depends on.

Porcelain tile is denser and harder than ceramic, and a carbide spear-point bit will struggle or dull quickly against it. A diamond-coated hole saw or diamond drill bit is the better choice for porcelain, cutting through the material by abrasion rather than by impact.

Glass tile needs the same diamond-tipped approach as porcelain, plus the water-cooling step below — glass is especially prone to cracking from heat buildup, more so than ceramic or porcelain.

Skip hammer mode entirely

Set a standard cordless drill/driver to drill mode with the hammer function off, not a hammer drill or rotary hammer. Most drills let you select this with a hammer-icon switch near the chuck; if a tool only does hammer drilling, it's the wrong tool for tile regardless of the bit in it.

Run the drill at a low speed with light, steady pressure. Tile bits cut through scoring and abrasion, not brute force, so pushing harder or running faster mostly just generates heat and increases the odds of a crack.

Mark the spot so the bit doesn't wander

A smooth glazed surface gives a spear-point or diamond bit nothing to grip at first contact, which is how bits skate sideways into a scratch or chip instead of starting a hole. Put a small X of painter's tape or masking tape over the mark first — it adds just enough texture to keep the tip from sliding.

Start the drill at a shallow angle to score a small divot, then straighten to vertical once the bit has bitten in and continue straight through at low speed.

Keep porcelain and glass cool while you drill

Diamond bits generate more frictional heat than carbide spear-point bits, and too much heat is one of the most common causes of a cracked tile on porcelain and glass. Keep a damp sponge or a small squeeze bottle of water nearby and pause every few seconds to wet the bit and the hole.

If the bit starts smoking, squealing, or feels hot to the touch through the chuck, stop and let it cool rather than pushing through — that heat is being absorbed by the tile as much as the bit.

Ease off as the bit breaks through

The far side of a drilled hole is the most likely place for a tile to chip or blow out, since there's no material left to support the glaze once the bit nearly punches through. Reduce pressure to almost nothing for the last bit of travel and let the bit finish the hole on its own rather than pushing it through.

If the tile isn't backed by a wall (a loose tile, or one you're drilling before installation), clamp a scrap piece of wood or cardboard underneath to support the backside and reduce blowout.