- Top Pick: WORX 20V 12" 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163
- Best Value: MZK 20V 12-Inch Cordless Weed Wacker, 8000 RPM, 4.0Ah Battery
- Premium Choice: SEYVUM String Trimmer, 20V 12-inch Cordless Weed Wacker with Auto Line Feed, 2 X 2.0Ah Battery Powered Lawn Edger with 8 Pcs Grass Cutter Spool Line, Fast Charger Included
Every homeowner with a yard eventually faces the same frustrating gap between the mower’s cutting width and the fence, flower bed, or curb where grass creeps in untouched. A string trimmer fills that gap, but the market is crowded with options that range from genuinely useful tools to flimsy gadgets that die after a single weekend session. The difference comes down to a handful of real factors: battery voltage and capacity, whether the unit doubles as an edger, and how much runtime you actually get before the pack runs dry.
We compared eight cordless string trimmers currently available, weighing published specifications against recurring themes in owner feedback. The picks below reflect that synthesis—no single spec dominates, but patterns emerge. The $35 units will handle a small patch of grass; the $100-plus combos deliver genuine yard-wide capability. Below you will find a quick-reference table, detailed mini-reviews, and a buying guide that explains which numbers matter and which are marketing noise.
As an Amazon Associate we earn from qualifying purchases at no extra cost to you. Product prices and availability are accurate as of the date shown and are subject to change.
Quick Picks
| Product | Best for | Price |
|---|---|---|
| WORX WG163 | Most homeowners wanting one tool for trim and edge | $65.45 |
| MZK 20V 12″ | High RPM on a tighter budget | $49.99 |
| SEYVUM 20V | Lowest price with included spare line and fast charger | $35.98 |
| BLACK+DECKER LST300 | Reduced vibration and steel-deck durability | $69 |
| 20V Electric Cordless (generic) | Budget buyers who want two batteries included | $35.99 |
| Greenworks 40V Combo | Trim and blower in one purchase | $129.99 |
| WeGofly 13″ 4-in-1 | Multi-function use including brush cutting | $88.99 |
| CRAFTSMAN CMCST901M1 | Longest runtime on a single charge | $99 |
How We Picked
We evaluated each unit on four criteria: power output (voltage and RPM where published), included battery capacity and runtime, build quality signals such as steel decks versus plastic, and the value added by multifunctionality. Owner feedback was weighted on reliability over multiple seasons and whether the included accessories held up after the first month of use.
The 8 Best String Trimmer in 2026
WORX WG163
The WG163 converts from a 12-inch trimmer to an edger by sliding a single pin, a mechanism that works quickly and feels solid on the shaft. At 20V it handles typical residential grass and light weeds without bogging down. Owners repeatedly praise its balance—light enough to hold at awkward angles for extended periods.
- True 2-in-1 with a simple, tool-free switch between trim and edge modes
- 20V platform shares batteries across the wider WORX garden lineup
- Single battery means shorter sessions on larger yards
Skip this if your yard has heavy brush or thick, overgrown patches; the 12-inch cutting width and mid-range power will leave you frustrated.
MZK 20V 12-Inch Cordless Weed Wacker
The headline spec here is 8000 RPM, which puts it near the top of its price bracket for raw spindle speed. The 4.0Ah battery is a genuine capacity advantage over competitors at similar cost, and 12 inches of cutting width covers standard residential edging work. Owners note the runtime is noticeably longer than the single-battery 2.0Ah units in this comparison.
- 8000 RPM delivers clean cuts through denser grass
- 4.0Ah battery provides the longest runtime among budget options
- Brand lacks a broad battery ecosystem, so spare packs may be harder to source
Skip this if you already own tools from a major battery platform and want cross-compatibility with existing packs.
SEYVUM 20V Cordless Weed Wacker
At just under $36, the SEYVUM includes two 2.0Ah batteries, a fast charger, and eight spool lines in the box. The auto line feed eliminates the bump-and-feed hassle that irritates many trimmer owners. For a small yard or a homeowner who trims once a month, this is the most complete package per dollar in the group.
- Two batteries plus eight spool lines included at the lowest price point
- Auto line feed removes a common maintenance frustration
- Build quality and long-term durability are uncertain given the aggressive price
Skip this if you need a tool for weekly heavy use or brushy areas; it is best suited to light, infrequent trimming.
BLACK+DECKER LST300
The LST300 is a 2-in-1 trimmer and edger with a 12-inch steel deck, a material choice that resists damage from curb strikes better than plastic alternatives found elsewhere. BLACK+DECKER’s 20V MAX platform is one of the most widely supported battery ecosystems, making spare packs easy to find. Reduced vibration design is a meaningful comfort feature on longer sessions.
- Steel deck withstands accidental contact with hardscaping
- Part of the broad 20V MAX platform with extensive accessory and battery availability
- Price sits above several 20V competitors that offer two batteries in the box
Skip this if two included batteries are your top priority at under $50; you pay a small premium for the steel construction and platform access.
20V Electric Cordless String Trimmer (2x 2.0Ah)
This generic-branded unit mirrors the SEYVUM in price and battery configuration—two 2.0Ah packs included for under $36. It targets the same buyer: someone who wants adequate trimming capability without committing to a platform ecosystem. The lack of a recognized brand means fewer published details on motor torque, cutting mechanism, or warranty terms compared to name-brand options.
- Two batteries included at a budget price
- Simple cordless design with no fuel mixing or pull-cord starting
- Minimal published specification and brand support compared to competitors at slightly higher prices
Skip this if you want clear warranty backing or long-term parts availability.
Greenworks 40V String Trimmer and Blower Combo
The 40V platform gives this trimmer a meaningful power step up from the 20V units above, and bundling a 390 CFM blower at $130 undercuts buying the two tools separately. For anyone who already owns Greenworks 40V batteries, the trimmer head can be purchased as a bare tool, reducing cost further. The combo is best viewed as an entry point into a mid-voltage system.
- 40V motor handles thicker growth and longer sessions than 20V alternatives
- Bundled 390 CFM blower adds immediate utility for a single purchase
- Higher price and weight make it less convenient for quick touch-up trims
Skip this if you only need a trimmer and already have a working blower; the combo value disappears.
WeGofly 13″ 4-in-1 Cordless Trimmer
Four functions—trim, edge, mow, and brush cut—fold into one shaft at 5.2 pounds, with steel gears rather than plastic ones in the drive head. The 21V × 2 configuration with 6.0Ah packs is unusual; real voltage sits between the 20V budget tier and the 40V step-up. The 13-inch cutting width is wider than most competitors here.
- Steel gears suggest longer mechanical life than plastic-drivetrain alternatives
- 5.2 lbs keeps fatigue low during multi-function sessions
- Four-in-one claims set high expectations; brush-cutting and mowing modes will not match dedicated tools
Skip this if you already own a separate mower and edger; the multifunction value is minimal.
CRAFTSMAN CMCST901M1
Up to 63 minutes of claimed runtime on the included 4Ah battery is the longest figure published in this comparison, and the 13-inch cutting width edges out most 12-inch rivals. The V20 platform ties it to CRAFTSMAN and RIDGID battery systems, so owners of those tools gain a free battery ecosystem. Lightweight construction is a stated design priority.
- Up to 63 minutes runtime covers large yards without a mid-session swap
- V20 platform compatibility with CRAFTSMAN and RIDGID batteries adds versatility
- Premium price at $99 puts it above the strongest budget performers
Skip this if your yard is small and a single 20V charge is always enough; you are paying for runtime you will not use.
Buying Guide
Voltage and Battery Capacity
Voltage determines cutting power; capacity (measured in amp-hours) determines runtime. A 20V motor with a 2.0Ah pack suits weekly light trimming of a few hundred square feet. If you have a larger lot or thicker weeds, look at 40V systems or 20V units with 4.0Ah or higher packs. Two 2.0Ah batteries do not equal one 4.0Ah in usable runtime because swapping introduces a pause and an extra component to manage.
Cutting Width and Deck Material
Twelve inches covers the gap between mower passes in most suburban layouts; thirteen inches reduces the number of passes on wider gaps. Deck material matters for durability: steel decks survive curb strikes and gravel contact, while plastic decks crack over time. If you frequently edge along concrete or work near decorative stone, a steel deck is a practical investment.
Multifunctionality Versus Dedicated Performance
2-in-1 and 4-in-1 designs add convenience but introduce compromise. A trimmer that also converts to an edger is genuinely useful and rarely sacrifices performance. A unit that claims to also mow and brush-cut will excel at none of those secondary roles. Buy multifunction units when the added mode matches a real, frequent need; otherwise a single-purpose trimmer with better ergonomics is the stronger choice.
Our Verdict
For most homeowners, the WORX WG163 is the best string trimmer overall: a proven 20V platform, a fast trim-to-edge switch, and a $65 price that undercuts comparable 2-in-1 units. For budget buyers who just need reliable trimming without extras, the SEYVUM at $35.98 delivers the most complete starter package—two batteries, auto-feed head, and spare line included. One condition where another product clearly wins: if your priority is uninterrupted runtime on a large lot, the CRAFTSMAN CMCST901M1’s 63-minute claim and 13-inch width make it the practical choice at $99.
FAQ
Is 20V enough for a string trimmer?
Yes, 20V is sufficient for mowing-line grass and light weeds along edges and fences. It will struggle with thick brush, mature dandelion stems, or woody growth. For those tasks, a 40V unit or a gas-powered trimmer is more appropriate.
How long do cordless string trimmer batteries last per charge?
A 2.0Ah pack on a 20V trimmer typically handles a small-to-medium yard in one session; a 4.0Ah pack roughly doubles that runtime. Published figures like the CRAFTSMAN’s 63-minute claim assume no-load or light-load conditions, so expect less under sustained cutting resistance.
What is auto line feed and is it worth it?
Auto line feed extends new line automatically as the cutting edge wears, eliminating the bump-on-ground mechanism that triggers manual advance. It is a genuine convenience on longer sessions and reduces the risk of over-extending line. Units with this feature tend to cost slightly more but save frequent interruptions.
Can I use the same battery in different brand trimmers?
No, unless the brands share a platform. CRAFTSMAN V20 and RIDGID batteries are interchangeable; WORX 20V packs fit other WORX garden tools; BLACK+DECKER 20V MAX works across that line. Budget units like MZK or SEYVUM use proprietary packs that will not fit major-brand batteries.
