10 Best Automatic Knife Sharpener | Dull Blades, Meet Their Match

Check price on Amazon

A three-in-one that handles the ceramic blade and the kitchen scissors too

Most pull-through machines stop at straight steel. The Narcissus S867-2 does not. It runs diamond sharpening wheels (abrasive discs coated in diamond grit) through a dual-slot system: a coarse slot to bring a dull blade back, and a fine slot to polish off the burr (the rough lip left on a sharpened edge). It is built to take straight, serrated and ceramic knives plus scissors. If your kitchen has a ceramic blade or a pair of shears that has gone blunt, that spread is the reason to look here.

The workflow is genuinely quick. You insert the knife at an angle, keep it against the outer wall, and pull from outside to inside two to five times per slot. Diamond is the hardest cutting surface in this lineup, so it cuts fast rather than grinding away slowly. The 100-240V wide voltage design also means it travels with you.

Stability gets attention in the design: a lower center of gravity and four anti-slip foot pads keep the unit planted, and the ergonomic handle makes the pull easier to control. It weighs 1.7 pounds against the Presto 08800 EverSharp’s 3 pounds, so it lifts off the counter and into a drawer without effort. At 8.2″L x 2.9″W x 2.7″H it stores small. The caveats are real but small in scale — one unit that arrived as a gift unit failed to power on and was refunded, and a couple of owners noted the price felt high for non-professional use. The 12-month replacement policy and 24-month after-sales service cover that risk.

A frequently-used blade came back transformed: “Sharpened a frequently used knife with 15-20 passes per side plus ~10 on fine side; result amazing.” Fifteen minutes gets a whole kitchen’s knives done, which is the everyday win here.

Check price on Amazon

The two-slot classic that made razor edges a household routine

Presto has been selling this design for long enough that it has become the default kitchen sharpener in a lot of homes, and 4.5+ stars across more than 18,000 owners says the formula still lands. The idea is as simple as it gets: two slots, precision blade guides that hold the knife at the right angle, and Sapphirite wheels — the same ultra-hard material used in professional sharpening shops. You draw the blade through each slot a few times and you are done.

Stage one grinds a precisely angled edge; stage two hones and polishes it. Set-up is quick enough that nobody dreads it, and the machine works on most any non-serrated blade — kitchen knives and sport knives alike. It runs on 120 volts and is built to North American electrical standards, with a 1-year limited warranty. At 9.9″L x 7.2″W x 4.8″H it wants a real spot on the counter rather than a drawer, and at 3 pounds it stays put when you pull a blade through.

Quality is the aspect owners praise most by a wide margin, with sharpness and value close behind. Old, tired knives come back looking and cutting like new, and the edge holds for a long stretch rather than fading in a week. It also turns sharpening into a two-minute chore instead of a project.

The limitation to accept: this is a fixed two-stage machine built for non-serrated blades at one preset angle. Serrated bread knives and scissors need a different tool. For straight-edge kitchen steel though, it is the low-fuss benchmark.

Check price on Amazon

Three motor speeds and two grind angles, all readable on a small screen

Very few sharpeners in this lineup let you pick the motor speed. This one does, and it puts the setting on an LCD display so you know exactly what you selected. Three thousand RPM suits fine and serrated blades, four thousand RPM is the everyday kitchen setting, and five thousand RPM is for very dull or high-hardness blades. Most pull-through machines give you no speed control at all.

The grinding side is three stages: 300# and 600# diamond wheels rebuild and refine the edge, then a 1000# ceramic rod polishes it — and that rod is removable so you can reach special shapes. The variable-angle design sharpens at 22.5° for standard knives or 32.5° for garden shears and small axes. Matching the angle to the blade’s factory edge is what keeps you from grinding a knife thinner than it should be.

Sharpening performance is the clear strong suit here — well over three dozen owners point straight at how well it sharpens, with sharpness the next most-praised trait. The built-in magnetic chassis collects the metal dust as you work, and the tray lifts out so you wipe it clean instead of chasing shavings around the sink. It measures 9.8″L x 4″W x 3.5″H and weighs 1.7 pounds, so it stores without a fight.

The fair warning is the motor over the long haul: durability on that part draws mixed and occasionally negative feedback, so this is a machine for regular home use rather than a hard-work commercial kitchen. For the occasional big sharpening session, it does the job well.

Check price on Amazon

The preset-angle machine for anyone who has never sharpened a knife before

The whole pitch here is that you cannot get the angle wrong. A built-in 20° angle guide holds the blade at a fixed chef-recommended tilt through all three stages — repair, sharpen, polish — so a first-timer gets a consistent edge without learning to feel the bevel. For a home cook who just wants sharp knives back, that removes the part people get wrong.

It runs 100% diamond wheels across those three stages and draws on a standard 110V U.S. supply. A non-slip pad keeps the unit from sliding across the counter while you pull, and a powerful motor is described as delivering smooth sharpening without overheating or slowing down. The magnetic collector pulls the metal shavings in as you work, so cleanup is a wipe rather than a scrub. It measures 12″L x 4.92″W x 4.8″H and weighs 2.4 pounds.

Sharpening performance is what carries it — well over a hundred owners call out how well it sharpens, with quality the next most-praised trait. Results show up fast: dull knives come back super sharp in minutes, and beginners report no trouble at all. Sturdy build and a stable stance keep it planted through the pass. It ships in gift-ready packaging and carries a 1-year replacement warranty.

The one thing to know before you start: not every knife fits. About seven in ten of one owner’s knives took a clean edge, but the rest had handles that blocked part of the blade from reaching the sharpener. Check that your handle sits clear of the slot before you count on a full drawer getting done.

Check price on Amazon

The one that disappears into a drawer between sharpening sessions

Counter space is the quiet reason people stop using a sharpener. This unit answers that directly. Its small footprint tucks into a kitchen drawer or cabinet, and it weighs just 16 ounces, so it lifts out and goes back without effort. The design also includes practical cord storage, which keeps the cable from tangling the drawer shut.

In use it is as hands-off as the category gets. There is no angle to hold and no skill required — the electric motor and guided design do the work. It sharpens chef, santoku, paring, utility and serrated kitchen knives, so the whole block gets covered. One detail worth knowing: it includes an auto-shutoff that stops the motor once the edge is sharp, and that short run time is exactly what prevents over-sharpening a blade you only needed to touch up.

Ease of use is what carries the reputation here — far and away the most-praised trait, with sharpness right behind. Knives that have sat dull for decades come back razor-sharp with minimal effort, which is why it gets recommended to people who have never owned an electric sharpener. The case opens up for cleaning and the discs are reversible and replaceable, so metal dust has somewhere to go.

The catch is what it will not do. It works best on smaller, thinner knives — a large Japanese chef’s knife is a stretch, and ceramic blades are off the table. A couple of owners also wanted more than one angle option. For the standard kitchen block, though, it is the easiest to live with.

Check price on Amazon

A belt-and-hone combo built for pocket knives as much as kitchen blades

This is the sharpener that goes in the truck, the tackle box, or the hunting pack. It uses the same flexible abrasive belt approach as the MK2. The belt conforms to any blade and cuts a convex edge (a rounded edge profile that slices better and holds longer than a flat-ground one). A tapered fine-grit honing rod (a thin rod for touch-ups) handles cleanup passes and reaches large and small serrations.

The fixed sharpening guide keeps the angle repeatable, so ten blades in an evening all come out consistent. The honing rod is the quiet hero: a built-in guided ceramic bar is what makes the final refinement easy, and even someone bad with whetstones can get a pocket knife shaving-sharp. The unit weighs 1.2 pounds and measures 7″L x 5″W x 4.5″H, with a 1-year warranty covering workmanship and design (abrasives excluded).

Quality is the standout ask-and-answer for owners — something north of two hundred sing it out, with sharpening performance right behind. It puts a razor edge on a knife fast, and one owner clocked six knives in fifteen minutes. Hunters like it for field work, and the whole thing is small enough to live in a bag until you need it.

Now the fine print. The included belts are aggressive, and a few owners find them heavy enough to leave deep grooves. Buy a spare belt pack in a finer grit and finish by hand if you want a refined edge. There is also only one sharpening angle, so thin Asian blades are not its target. For hunting knives and pocket folders, though, it is the balance.

Check price on Amazon

The three-stage upgrade that adjusts to blade thickness, hunting knives included

Where the two-stage Presto uses one guide setting, this one lets you dial the guide to the blade itself. A thickness selector has three positions — thick for hunting knives, medium for chef’s knives and standard kitchen knives, and thin for fillet and paring blades. That is a meaningful step up if your drawer holds knives of very different builds, and it is why this model also handles Santoku shapes.

It adds a third stage and finishes with an extra-fine-grit ceramic wheel that hones the blade to a razor edge and polishes it smooth. The Sapphirite wheels handle the grinding work, and the blade guides keep the angle locked so it stays a no-guess process. It runs on 120 volts and carries a 1-year limited warranty. Size is the thing to plan for: 18.43″L x 11.25″W x 2.18″H at 5.1 pounds, so this wants a permanent spot rather than a drawer.

It is the most expensive of the Presto line here because of that extra stage and the selector, and the payoff is a sharper finish. Owners call it effective at producing excellent edges and appreciate that it beats the cost of sending knives out for professional sharpening — a few minutes per knife and you are through the whole set.

What it will not solve: this is a straight-edge machine. Serrated blades want a different approach, and the fixed three stages mean you cannot dial in a custom angle for a delicate Japanese knife. For thick-bladed and mixed-thickness kitchens, it is the standout.

Check price on Amazon

Three diamond stages with a quiet motor and a spring guide that holds the angle

This one is built around a flexible spring guide rod, which keeps the blade at an ideal angle through the whole stroke. That matters because a fixed slot only works if your blade enters straight, and a spring guide makes room for a little human wobble. Stages one and two use 100% diamond abrasives to sharpen and hone; stage three polishes and finishes the edge.

The design keeps the noise low — a quality owners notice, with a noise-level aspect drawing positive feedback. It also runs 120 volts and carries a 2-year manufacturer warranty plus what Homly calls lifetime customer service within 15 hours. The body is 12.2″L x 4.8″W x 4.8″H and weighs 3 pounds — a desktop unit that wants a home on the counter or in a cabinet. Wear a light hand: too much pressure or too slow a pull can put a big indent near the handle, so practice on an old knife first.

Quality is what wins people over here — the largest positive cluster by far, with effectiveness right behind. Owners reach for it every few months and find the edge holds, and even a fish filet knife comes out better than new. A couple of owners have reported scratches from the guide, so keeping the blade moving through the pass is the trick. The motor’s feel under sustained load draws mixed notes, which in practice means this is a home unit, not a commercial workhorse.

One owner got a bit carried away and paid for it: “Works very well cut myself 2x didn’t feel a thing so it sharpens well.” That is as good a verdict on sharpness as you will find, and a reminder to move deliberately on the first blade.

Check price on Amazon

The machine that turns a 20-degree factory blade into a 15-degree slicing edge

This is the most serious sharpening tool on this list, and it does something the others do not: it converts. Household knives leave the factory at roughly 20 degrees per side. The 15XV grinds them down to the sharper 15-degree Trizor XV profile, combining a durable Trizor edge with an ultra-sharp 15-degree bevel. The result is a knife that glides through food rather than pushing through it.

The spec that surprises people is speed. First-time sharpening takes approximately one minute; resharpening is approximately 10 seconds. Patented flexible spring guides adjust automatically to keep the angle accurate, and the on/off switch is about as simple as controls get. Stage 1 and 2 are plated with 100% diamond abrasives to sharpen and hone; stage 3 uses a patented flexible abrasive system to polish. It measures approximately 10″L x 4.25″W x 4.25″H and weighs 4.2 pounds, and carries a 3-year limited warranty.

Effective is the theme: knives come back with a serious edge — enough to cut through paper cleanly — and the instructions for different blade types are thorough enough to follow without prior experience. It handles straight-edge and serrated blades both, which the pull-through units generally do not.

The trade-off is size and adaptation time: converting an edge from 20 degrees to 15 degrees is a one-time process and the manual expects you to work through it patiently. Once done, the 10-second resharpening is the payoff — this is a sharpener you will keep for years, and it is the priciest option here because it is the most capable.