Best Auto Feed String Trimmer for Corded and Cordless Yards

#1 · Best Overall

1. Greenworks 40V Trimmer

• Dimensions L x W: 12"L x 0.65"W
• Weight: 12 lb
• Size: 12" (Battery Included)

Best for: Battery-powered lawn and sidewalk trimming.

Why it ranks #1: Its auto-feed system eliminates bumping, while the 12-inch dual-line cutting path and included 2.0 Ah battery and charger make a complete cordless package.

A 12-inch dual-line cutting path gives the Greenworks 40V trimmer a clear fit for grass and light weeds around lawns, sidewalks, and landscaping. Its automatic feed advances line during operation, so buyers can trim without stopping to bump the head for more line.

The 0.065-inch dual line works across a 12-inch path, making this model suited to routine grass and light-weed trimming along lawn edges and hardscape. Auto feed advances line as you work, avoiding bumping to maintain cutting. A variable-speed trigger lets you adjust power to the task, while the included 2.0 Ah battery and charger complete the cordless kit. At 12 pounds, its listed weight is worth considering if frequent carrying is part of your yard workflow.

Skip it if you want a lighter listed tool; the 6.3-pound MZK ET2307 is specified at nearly half this model’s weight.

Choose the Greenworks for cordless trimming of grass and light weeds around sidewalks and landscaping, with variable speed and auto feed. Its 12-inch dual-line path suits routine yard work, but the listed 12-pound weight deserves consideration.

Listed on Amazon as: Greenworks 40V 12 in Cordless String Trimmer, 2.0 Ah Battery and Charger

#2 · Best Corded Option

2. BLACK+DECKER BESTA510

• Dimensions L x W: 8.5"L x 4.88"W
• Weight: 6.3 lb
• Size: One Size

Best for: Corded trimming with wheeled edging.

Why it ranks #2: Automatic Feed Spool technology pairs with a 14-inch cutting path and 6.5-amp motor; its wheel also supports conversion to edging.

The BLACK+DECKER BESTA510 pairs a 14-inch cutting path with an edging wheel that converts it from trimmer to wheeled edger. That combination lets homeowners trim overgrowth and finish lawn borders with one electric tool, while automatic feed spool technology advances line without bumping.

A 6.5-amp motor and POWERDRIVE transmission provide the listed power system for tackling grass, weeds, and overgrowth. The 14-inch cutting path covers a broader strip with each pass, while rotating the tool converts it to an edger with a wheeled guide for borders near driveways, sidewalks, and flower beds. Automatic feed spool technology removes the need to bump for line. The included spool, auxiliary handle, and guard provide key components for setup and operation.

Skip it if you need cord-free movement around the yard; the 20V BLACK+DECKER LST300 is a cordless trimmer and edger.

The BESTA510 fits homeowners who can work with a cord and want both trimming and wheeled edging, especially around sidewalks and flower beds. Its wider 14-inch path and automatic spool feed are useful, but corded operation sets the boundary.

Listed on Amazon as: BLACK+DECKER Weed Wacker with Auto Feed, 14-Inch 2 in 1 String Trimmer Lawn Edger, Powerful 6.5-Amp Lightweight Electric Weed Eater (BESTA510)

#3 · Best Lightweight Cordless

3. BLACK+DECKER LST300

• Dimensions L x W: 36.23"L x 8.5"W
• Weight: 5.7 lb
• Size: One Size

Best for: Cordless trim-and-edge convenience.

Why it ranks #3: The 5.7-pound cordless trimmer has automatic spool feed and converts to an edger, with a battery, charger, and spool included.

The BLACK+DECKER LST300 switches between trimming and edging in seconds, letting homeowners finish lawn edges without changing tools. Its AFS automatic spool feeds line when needed without bumping, while the 20V cordless kit includes a battery and charger for yard work away from an outlet.

A 12-inch cutting path and POWERDRIVE transmission, listed at 6,200 RPM, support cutting through grass and weeds; the product description also identifies overgrowth and heavy weeds as use cases. AFS advances line automatically, reducing interruptions from manual bumping. Conversion to wheeled edging expands its role around lawn borders, and the included 20V battery, charger, spool, and guard make it a ready kit. Its 5.7-pound listed weight and adjustable handle are relevant for maneuverability and fit.

Skip it if you want a wider cutting path; the BLACK+DECKER BESTA510 lists 14 inches rather than this model’s 12.

The LST300 fits buyers seeking cordless trimming and edging with automatic line feed in one kit. Its 12-inch path and 5.7-pound listed weight suit maneuverable work, while buyers prioritizing a wider cut should account for the boundary.

Listed on Amazon as: BLACK+DECKER 20V MAX String Trimmer and Edger 2 in 1, Cordless Weed Wacker with Auto Spool Feed, Battery and Charger Included, 12 Inch Steel Deck, Reduced Vibration (LST300)

#4 · Best 40V Cordless

4. WORX WG183

• Dimensions L x W: 63"L x 14.7"W
• Weight: 6.4 lb
• Size: No Size

Best for: WORX battery-platform homeowners.

Why it ranks #4: Its automatic-feed spool, 13-inch dual-exit cutting head, and two included 2.0 Ah batteries suit shoppers seeking a wider cordless cut.

WORX Power Share compatibility is the WG183’s key advantage for buyers already using WORX 20V or 40V tools. This 40V cordless trimmer pairs an automatic-feed spool with a dual-exit cutting head, combining line advancement without bumping and a two-exit cutting setup.

The 13-inch WG183 has a dual-exit cutting head, which supports greater cutting efficiency, and an automatic-feed spool that advances line without the usual bumping step. Its lightweight, streamlined design and adjustable auxiliary handle support maneuvering and user-adjusted handling during yard work. Power Share compatibility extends across WORX 20V and 40V tools and outdoor products, making the included two 2.0 Ah batteries useful within that battery ecosystem. The listed 6.4-pound weight adds a concrete handling consideration.

Skip it if you need a wider listed cutting path; the BLACK+DECKER BESTA510 offers 14 inches, compared with this WORX’s 13.

The WG183 suits WORX Power Share owners seeking a cordless 13-inch trimmer with automatic feed and two included batteries. Its adjustable handle aids fit, but buyers wanting a wider listed path should consider that boundary.

Listed on Amazon as: Worx Cordless String Trimmer, 40V 13" Electric Weed Wacker, WG183

#5

5. MZK 20V Trimmer

• Dimensions L x W: 17.32"L x 6.69"W
• Size: 12

Best for: Fast motor with automatic line feed.

Why it ranks #5: The 12-inch cutter lists automatic line feed and an 8000 RPM motor; its 4.0 Ah battery supports buyers who prioritize a larger included battery.

An 8,000 RPM motor is the MZK’s clearest performance specification, paired with a 12-inch cutting range for grass and weed trimming. Automatic line feed releases string without manual operation, helping maintain the cutting workflow without stopping to feed line by hand.

The 12-inch cutting range covers a defined strip with each pass, while the 8,000 RPM motor is specified to provide power for grass and weed trimming. Automatic line feed removes the need to manually adjust or feed string, supporting a smoother operating routine. The adjustable handle and 6.3-pound listed weight are relevant to handling during yard work. A 4.0Ah battery is identified in the title, but the supplied facts do not state runtime or charger contents.

Skip it if you need a stated runtime before choosing a cordless trimmer; the MZK details list a 4.0Ah battery but no duration.

The MZK fits buyers seeking a 12-inch cordless trimmer with an 8,000 RPM motor and automatic line feed. Its adjustable handle and listed weight support handling decisions, but runtime is not provided for planning longer sessions.

Listed on Amazon as: MZK 20V 12-Inch Cordless Weed Wacker, 8000 RPM, 4.0Ah Battery

#6

6. SEYVUM 20V Trimmer

• Dimensions L x W: 5.9"L x 9.4"W
• Weight: 8 lb
• Size: 12 in

Best for: Adjustable head and plant protection.

Why it ranks #6: Automatic line feed is paired with a 12-inch cutting width, two 2.0 Ah batteries, a fast charger, and eight replacement spool lines.

A 90-degree adjustable cutting head gives the SEYVUM MJ8603 flexibility for tight spaces and varied trimming angles. It converts to a wheel edger, while a spacer guard helps protect plants, landscape features, and lawn ornaments during close work around borders.

The 180-degree adjustable auxiliary handle adds another way to adapt grip, and the compact, ergonomic design is described as suited to tight spaces. Automatic line feed advances line without manual feeding, supporting uninterrupted trimming. For edging, the wheel conversion and spacer guard help manage borders while protecting nearby landscaping. The kit title lists two 2.0Ah batteries, a fast charger, and eight grass-cutter spool lines, giving buyers supplied power and replacement line components for the workflow.

Skip it if you prioritize a lighter listed trimmer; the Seesii SST01 weighs 4.5 pounds, compared with this model’s 8.

The SEYVUM suits buyers who need adjustable positioning and careful edging around plants or ornaments, with auto feed and spare line included. Its listed 8-pound weight is a fit consideration for extended handling.

Listed on Amazon as: 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

#7

7. Boltarc RT-01

• Dimensions L x W: 47.16"L x 6.28"W

Best for: Cordless buyers seeking three functions.

Why it ranks #7: Its title identifies it as a 3-in-1 auto-feed cordless trimmer, but the supplied details do not specify cutting width, battery capacity, or included kit.

A 3-in-1 configuration is the Boltarc’s clearest distinction, bringing multiple yard tasks into one 21V cordless string trimmer. Its auto-feed line system is part of the product’s title, making it a fit for shoppers who want automatic line advancement while trimming without a cord.

The 21V cordless format gives buyers a trimmer without a power cord, while the 3-in-1 designation points to a multi-function tool rather than a dedicated trimmer. Auto feed is specifically listed in the title, so line advancement is handled automatically during operation. The supplied specifications identify a 47.16-inch length and 6.28-inch width, useful dimensions to consider when planning storage. Battery capacity, runtime, cutting width, and the other two functions are not specified in the supplied facts.

Skip it if you need a stated battery runtime or cutting width; the supplied Boltarc details do not give either specification.

The Boltarc suits shoppers looking for a cordless, auto-feed trimmer with a 3-in-1 configuration. Consider it when those listed basics match your yard; the supplied facts do not specify its cutting width, battery capacity, runtime, or the other functions.

Listed on Amazon as: 21V Cordless Weed Wacker Eater, 3-in-1 Auto Feed String Trimmer

#8

8. WORX WG163

• Dimensions L x W: 44.6"L x 35"W
• Weight: 5.5 lb
• Size: 20V GT 3.0 Trimmer / Edger

Best for: Sloped lawns and edging detail.

Why it ranks #8: This 5.5-pound, 12-inch cordless tool converts to an edger, but its push-button Command Feed advances line on demand rather than automatically.

A 90-degree tilting head makes the WORX WG163 especially relevant for sloped terrain and hard-to-reach trimming. It also converts between trimmer and edger in seconds, while the push-button Command Feed system supplies line on demand rather than relying on automatic advancement.

For edging, rubberized wheels guide the tool to help create straighter lines and cleaner cuts; the spacer guard helps protect plants and landscape features. The head tilts 90 degrees for slopes and awkward reaches, and conversion between trimming and edging takes seconds. Its Command Feed spool advances line at a button press, giving the operator control over when line is supplied. The kit includes two batteries, a charger, an edger wheel, spool, spool caps, safety guard, and flower guard.

Skip it if you want line to advance automatically as you work; the Greenworks 2101602 lists an auto-feed system.

The WG163 fits buyers who want one cordless tool for trimming and guided edging, particularly on sloped or awkward areas. Its tilt and wheel features aid control, but choose it only if button-operated line feed suits your workflow.

Listed on Amazon as: WORX 20V 12" 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163

#9

9. Seesii SST01

• Dimensions L x W: 56"L x 13"W
• Weight: 4.5 lb
• Size: 13 inch

Best for: Lightweight multi-mode yard work.

Why it ranks #9: The 13-inch trimmer-edger includes two 4.0 Ah batteries and a fast charger, but the supplied facts do not specify an automatic line-feed system.

At a listed 4.5 pounds, the Seesii SST01 is notably light while offering string-trimmer, edger, and mini-mower modes. Its guide wheels support transitions between tasks, so homeowners can use one tool for different lawn areas rather than relying on a trimming-only format.

The 13-inch cutting format pairs with two 4.0Ah batteries and a fast charger, giving the kit a stated runtime of up to 40 minutes with both batteries, about 20 minutes each. Guide wheels support its trimmer, edger, and mini-mower configurations, helping adapt the tool to borders and open lawn areas. The 4.5-pound listed weight is useful for buyers who prioritize maneuverability. Together, the multiple modes and included batteries support varied yard tasks without implying a runtime beyond the stated figure.

Skip it if you need longer than the stated 40 minutes of combined runtime; the supplied Seesii information does not list a longer duration.

The Seesii suits homeowners who value a light tool for trimming, edging, and mini-mowing, with two batteries and a fast charger. Its stated combined runtime tops out at 40 minutes, so plan around that operating boundary.

Listed on Amazon as: SEESII 13" String Trimmer Electric Weed Wacker with 2x4000mAh Batteries

#10

10. Glenvera YD2505

• Dimensions L x W: 9.5"L x 7"W
• Weight: 6 lb

Best for: Cordless trimming and lawn borders.

Why it ranks #10: It is a cordless 2-in-1 trimmer and edger, but the listed details do not confirm automatic feed or provide a cutting width or battery capacity.

The Glenvera YD2505 combines cordless operation with a 2-in-1 trimmer-and-edger format, letting buyers handle grass, weeds, and lawn borders with one tool. Its cordless design avoids tangled cords and outlet limitations, useful when working around different areas of a yard.

Switching between trimming and edging gives the YD2505 two listed roles for routine lawn care, while cordless operation allows work without a power outlet nearby. The supplied title specifies a 20V system and 12-inch format, providing a defined voltage and cutting size for buyers comparing tools. At 6 pounds, its listed weight gives another practical handling point. The supplied product facts do not identify battery capacity, runtime, line-feed type, or charger contents, so those details cannot guide a purchase from this information.

Skip it if you need a stated runtime and battery capacity; the supplied Glenvera details provide neither specification.

The Glenvera fits homeowners wanting a cordless tool for both trimming and edging, especially where outlets limit access. Its 20V, 12-inch format and 6-pound listed weight clarify basic fit, but battery details remain unspecified.

Listed on Amazon as: 20V 12” 2-in-1 Cordless String Trimmer & Electric Lawn Edger