A chip is not filled and it is not honed out. You fix it by grinding the entire cutting edge back until the deepest point of the chip has gone, then rebuilding the bevel from coarse to fine. That is the whole method, and the reason it surprises people is the scale: to remove a chip half a millimetre deep you have to take half a millimetre off the whole length of the edge, or at least enough of it that the edge line stays smooth. It takes longer than you expect, it belongs on a coarse diamond plate rather than on your good finishing stone, and a honing rod does nothing at all for it.
Good news first: most chips are cosmetic and you can ignore them. If the chip is shallower than a fraction of a millimetre, routine sharpening will take it out over the next few sessions without you doing anything special. Only commit to a repair if the chip is deep enough to catch, visible as a notch in the edge line when you look down the blade, or big enough to leave a flat spot that will not cut.
First, is it actually a chip?
Three different failures look similar and want completely different responses.
A rolled edgeis the edge bent over to one side. It feels blunt and it reflects light along a line, and it is fixed in fifteen seconds on a honing rod. This is what almost every “suddenly dull” knife has. If a rod brings it back, it was never a chip — how to use a honing steel.
A worn edge is uniformly dull with no visible damage. That is normal sharpening territory, and how to sharpen kitchen knives is the page.
A chip is material missing. Look straight down the edge under a light: a chip shows as a notch in the edge line and as a bright flat spot where there should be nothing to reflect. That is the one this page is about.
A bent tip is also different again, and worth checking for before you start grinding: a tip that has been levered sideways can sometimes be straightened rather than ground back, which saves a lot of blade.
The repair, step by step
1. Measure the chip. Look down the edge and judge how deep the deepest point is. That depth is how much steel has to come off the edge. If it is more than about a millimetre you are reshaping the knife rather than sharpening it, and the professional option below gets more attractive.
2. Grind the edge back flat — deliberately blunt it. This is the step that feels wrong and is correct. Hold the knife perpendicular to a coarse diamond plate, edge down, and run it along the plate to take the edge off in a straight line until the chip is gone. You are creating a small flat along the top of the edge, which is sometimes called blunting the edge or creating a micro-flat. Keep checking down the edge until the notch has disappeared and the flat is an even width along the blade.
3. Rebuild the bevel on the coarse side.Now go back to your normal sharpening angle — around 20 degrees per side for a Western knife, 15-16 for a Japanese one — and grind on the coarse plate until the flat you just made has disappeared and the two bevels meet in an edge again. This is the long part. Work both sides evenly and keep looking: the flat getting narrower and then vanishing is how you know the bevel has reached the apex. For the angle itself, knife sharpening angles.
4. Work up through the grits.Move to a fine diamond face or a 1000-grit stone, raise a burr along the whole edge, then flip and do the other side. Finish on whatever your usual finest grit is. The coarse grinding left a rough edge with a weak apex, and this is the step that turns it into a usable one — whetstone grits explained covers the progression.
5. Deburr, and check the profile. A few light alternating passes, or a strop, to remove the wire edge. Then look at the knife side-on: if you removed a lot of metal in one area, the edge line may now have a dip in it, and the fix is to blend the surrounding edge until the line is smooth again. A knife with a straight edge line that is slightly shorter in the blade is a working knife; a knife with a scalloped edge line is not.
Three rules that make the difference
Use a coarse diamond plate, not your water stone.This job removes more material in one session than months of routine sharpening, and doing it on a 1000-grit water stone will dish the stone badly and take forever. A coarse diamond plate cuts faster, stays flat, and does not get consumed — see how long does a whetstone last for why that matters.
Keep the steel cool.This matters on a powered grinder and barely at all by hand. If you are using a bench grinder or a belt sander, heat will destroy the heat treatment at the edge — and once the steel has been softened, no amount of sharpening brings the edge retention back. Blue or straw discolouration at the edge means the damage is done. By hand on a plate with water, this is not a risk.
Accept that the knife gets shorter. You are removing blade height, and on a deep chip you will see it. That is the cost of the repair and there is no version of it where the metal comes back.
When to send it out instead
Three cases where we would not do this at home.
A chip deeper than roughly a millimetre, or several chips along the edge. The amount of metal removal and blending involved is a lot of hand work and easy to get wrong in a way that leaves the edge line wavy.
A broken tip. Reshaping a tip means regrinding the whole front profile of the knife to a new curve, which is a shaping job rather than a sharpening job and looks obviously wrong when done badly.
An expensive hard Japanese knife. A 60+ HRC clad blade is unforgiving, the bevels are narrow, and the knife is worth more than the service. Kai will re-sharpen Shun knives; plenty of independent sharpeners handle Japanese knives properly. Local knife sharpening services is the page on finding one and what to ask them.
Why it chipped, so it does not happen again
Chipping is almost always one of six things, and five of them are habits.
Hard steel meeting bone or frozen food.The classic. A 60+ HRC edge cannot deform to absorb the impact so it fractures. Keep a cheap tough knife for anything with bone in it — what HRC means on a knife explains the mechanism and best chef knives under $50 is where the tough cheap knife lives.
Twisting or prying. Levering through a squash, separating frozen portions, opening anything. Lateral force is what a thin hard edge is worst at.
Knives loose in a drawer.Steel knocking against steel chips edges, and it happens silently. This is a genuinely common cause and the fix is cheap — best knife storage.
Hard boards. Glass, stone, ceramic and bamboo. Usually these roll an edge rather than chip it, but on hard steel they chip. Best cutting boards for knives.
Chipping during sharpening.Too much pressure on a coarse stone, or a wobbling angle that lands the edge flat into the abrasive, will take small pieces out of a hard edge. If this is happening, lighten up and check your angle — knife sharpening mistakes.
The dishwasher. Knives knocking against the rack and other cutlery through a wash cycle, plus detergent attacking the edge. Can you put knives in the dishwasher.
Is it safe to use a chipped knife?
A small chip is not dangerous in itself, but it is worth knowing what it does. The chip is a flat spot that will not cut, so the blade catches and skips at that point in the stroke — and a knife that skips is a knife that can slide off what you are cutting. On a food-safety level, a chip in a kitchen knife is a missing piece of steel that went somewhere; if a visible fragment is gone and you were cutting food at the time, discard the food. That is the honest answer to “chipped knife in food”: the risk is small, the cost of the precaution is a portion of dinner.
A chipped tip deserves more caution, because the tip is where you apply force in a narrow place and a damaged tip is a weak one. If it is broken rather than nicked, stop using it for anything that involves pressing.
Can you fill a chip, or weld it?
No, and it is worth saying plainly because people ask. There is no filler that will take an edge and no home process that adds steel back. Welding or brazing a kitchen blade destroys the heat treatment around the repair and leaves a soft zone exactly where you need hardness. Grinding the edge back is the only real fix.
Should you just replace the knife?
Sometimes, and the arithmetic is not sentimental. If the knife is a stamped foodservice blade and the chip is deep, the repair is an hour of your time against the cost of a new knife that will be the same knife — replace it. The reason this site keeps recommending inexpensive knives for rough work is partly this: a cheap knife that chips is a non-event.
If the knife is forged, or hard Japanese steel, or has real blade height left, repair it or have it repaired. Those knives are designed to be ground down over decades and losing half a millimetre is a normal event in their life rather than the end of it.
What a professional does differently
Mostly: they use power, and they control heat. A sharpener with a wet belt grinder or a powered water wheel can remove the metal in minutes rather than an hour, with water carrying the heat away so the heat treatment survives. They will also blend the edge line properly afterwards, which is the part that is genuinely difficult by hand on a deep chip.
What to ask for when you hand it over: the angle you want it ground at, whether they work wet, and whether they will match the existing bevel. A sharpener who grinds every knife to one Western angle will take a Japanese knife out of spec. Local knife sharpening services goes through this in more detail.
How we scored these three
Five metrics built for the repair rather than for sharpening in general. Fit for the repair asks how well the tool suits grinding an edge back and rebuilding it. Metal removal rate is how fast it takes material off, which is the bottleneck in step two and three. Angle control is how hard it is to make the knife worse, which on a coarse abrasive is the main risk. Finish after repair is whether the tool can take the edge all the way back to usable or needs another step. Valueis all of it against the live price. The overall is the mean to one decimal place. We have not timed a repair in a lab and we are not going to pretend otherwise — see how we review.
