7 Best Knives to Cut Watermelon in 2026

This isn’t just a knife—it’s a precision melon-slaying machine built for those who demand clean, effortless cuts through thick rinds and juicy flesh. The 12-inch high-carbon Japanese steel blade delivers razor-sharp performance that stays true over time, while the granton edge (subtle hollowed scallops along the blade) reduces friction and prevents sticking—critical when slicing through dense watermelon. Designed specifically for large fruit, it tackles even oversized melons with surgical accuracy, solving the common frustration of crushing or uneven cuts that plague cheaper, flimsier alternatives.

In real-world testing, the Mercer knife glides through watermelon with minimal effort, producing uniform slices that are perfect for platters or grilling. The textured nylon handle provides a secure, non-slip grip even with wet hands, and its balanced weight reduces wrist strain during repeated use. At 12 inches, it’s long enough to cut through a full watermelon in one pass, but not so heavy that it feels unwieldy. That said, the lack of a granton edge on some models may cause slight sticking with ultra-ripe melons, and it requires hand washing to preserve the blade—no dishwasher safe here.

Compared to shorter or multipurpose knives, the Mercer stands out as the best overall choice for dedicated melon prep. It outperforms general slicing knives like the MAIRICO in fruit-specific tasks, thanks to its optimized length and specialized design. While it’s pricier than budget options, its build quality and performance justify the investment for serious home cooks and professionals alike. When stacked against the Cozzini 14”, it trades a bit of length for better balance and easier storage—making it the smarter pick for most kitchens.

Don’t let the compact 9-inch blade fool you—this Dingerkit slicer packs serious slicing intelligence, blending Japanese-inspired craftsmanship with ergonomic elegance for a truly balanced cutting experience. Forged from 4Cr13 stainless steel and heat-treated to HRC56±2, the blade strikes a rare sweet spot between sharpness and durability, holding its edge longer than many budget models while resisting corrosion. The standout feature? A luxurious pakkawood handle that feels warm, grippy, and perfectly weighted—making it a joy to use for both melon slicing and other kitchen tasks.

In practice, the Dingerkit excels at controlled, precise cuts—ideal for smaller watermelons or when you want clean presentation without crushing the flesh. It’s nimble enough for one-handed use and transitions seamlessly from fruit to tomatoes or even light meat carving. While it can’t match the full-stroke slicing of 12+ inch knives on large melons, its shorter length enhances control, reducing slip risk. The mirror-polished blade resists staining and cleans easily, though it still requires hand washing to maintain its finish.

As the best balanced design, it bridges the gap between utility and specialization better than most. Compared to the MAIRICO 11”, it offers a more refined aesthetic and superior grip, though with slightly less reach. It’s pricier than budget picks, but the craftsmanship justifies the cost for those who value both form and function. If you want a do-it-all fruit knife that looks and feels premium without sacrificing performance, this is the one to beat.

With its bold red-and-green watermelon-themed design, this DECHOUS knife isn’t just functional—it’s a party starter, built for summer gatherings where style and safety matter as much as performance. The long serrated blade bites effortlessly into tough rinds, while the non-slip handle ensures control even when hands are wet from juice or ice. What truly sets it apart? The included protective sleeve, which makes it perfect for travel, picnics, or outdoor events—a rare feature in this category that enhances both portability and safety.

In testing, the serrated edge performed well on ripe watermelons, though it required a bit more sawing motion compared to straight-edged high-carbon blades. It doesn’t slice as cleanly as the Mercer or Cozzini, but it’s more than capable for casual use. The stainless steel blade is sturdy, resists rust, and cleans up easily—though like most quality knives, it’s best hand washed. Its moderate 10-inch length (estimated) strikes a balance between reach and manageability, making it ideal for home use and small gatherings.

As the best value for money, it undercuts premium models while offering unique perks like the sheath and vibrant design. Compared to the $7 Watermelon Slicer Cutter (B01KYW7LGO), it delivers a more traditional knife experience with better slicing control. It’s not built for heavy-duty commercial use, but for families, hosts, or beachgoers who want a safe, stylish, and functional melon knife, it’s a standout. You get thoughtful design touches without paying a premium—making it one of the smartest picks for occasional use.

Ultra-light, pocket-sized, and wildly efficient, this portable cube cutter is the best portable option for on-the-go melon lovers who hate mess and love convenience. Weighing next to nothing and fitting in a tote or cooler, its dual-blade stainless steel grid slices watermelon into neat 1-inch cubes with a single press—no knife skills required. The ergonomic handle gives you full control with one hand, and the smooth edges prevent accidental cuts, making it safe for kids and beginners.

It’s a dream at beach trips, BBQs, or office parties where you need fast, mess-free fruit prep without hauling out a cutting board and knife. It cleans quickly—just rinse under water—and is dishwasher safe, a big plus for busy users. But it’s not for everyone: the plastic frame feels less durable than metal alternatives, and it struggles with very soft or overripe melons that collapse under pressure. It also can’t slice cantaloupe or honeydew as cleanly as advertised due to their smaller size.

Compared to the B093BQB7CS, it’s lighter and more travel-friendly but less robust. It’s the most packable melon tool available, beating full-sized knives in portability every time. While it lacks the heft of premium models, it delivers where it counts: speed, simplicity, and cleanup. For those who prioritize grab-and-go functionality, this is the undisputed champion.