Best Auto Feed String Trimmer for Lawn Edges and Trimming

#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: Auto-feed cordless lawn maintenance.

Why it ranks #1: Its automatic-feed system, 12-inch dual-line cutting path, variable-speed trigger, and included 2.0 Ah battery and charger make it a complete cordless choice.

A 12-inch dual-line cutting path paired with automatic line advancement gives the Greenworks 40V trimmer a straightforward mowing-and-trimming workflow: cover a defined swath, then keep working without bumping the head for more line. The kit includes a 2.0 Ah battery and charger, so those essentials are listed together.

The 0.065-inch dual line cuts a 12-inch path, a defined width for trimming grass and light weeds around lawns, sidewalks, and landscaping. Automatic feed advances line during operation, avoiding the bump-and-advance step. A variable-speed trigger lets you adjust power to the task, while the included 2.0 Ah battery and charger provide the listed power components in the package. At 12 pounds, its stated weight is worth considering if you prioritize a lighter tool for extended handling.

Skip it if you want a wider listed cutting path; the BLACK+DECKER BESTA510 specifies a 14-inch path and wheeled edging.

This Greenworks kit fits homeowners who want cordless trimming, automatic feed, adjustable speed, and a battery and charger in the package. Its 12-inch path and 12-pound listed weight are relevant boundaries for buyers comparing coverage or handling.

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: Wheeled edging and wide swaths.

Why it ranks #2: Automatic Feed Spool technology pairs with a 14-inch cutting path, 6.5-amp motor, and wheeled edger conversion for corded yard work.

A 14-inch cutting path and wheeled edge guide give the BLACK+DECKER BESTA510 a clear fit for lawn borders and broader trimming passes. Rotate the tool to switch between trimming and wheeled edging, while Automatic Feed Spool technology advances line without the usual bumping step during operation.

The 6.5-amp motor and POWERDRIVE transmission are specified for cutting through tough weeds, grass, and overgrowth, while the 14-inch path covers a wider swath than a 12-inch trimmer. For borders along driveways, sidewalks, and flower beds, rotate the tool into wheeled-edger mode and use its edge guide. Automatic Feed Spool technology keeps line moving without bumping. The listed package includes a spool, auxiliary handle, and guard; this is an electric, not battery-kit, model.

Skip it if you need cordless freedom away from an outlet; the Greenworks 2101602 is a 40V cordless trimmer with battery and charger included.

This BLACK+DECKER fits homeowners prioritizing a wide path and guided edging around sidewalks, driveways, or flower beds. Its electric format is the key boundary: choose a cordless model instead if your trimming route has no usable power connection.

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 · Dual-Battery Kit

3. WORX WG183

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

Best for: WORX Power Share trimming kit.

Why it ranks #3: This 40V, 13-inch cordless trimmer specifies an automatic-feed spool system and includes two 2.0 Ah batteries for users wanting a ready-to-use kit.

Compatibility with WORX Power Share 20V and 40V tools gives the WG183 a clear battery-platform fit for existing WORX owners. The 13-inch dual-exit cutting head and automatic-feed spool support trimming workflow, while the listed kit includes two 2.0 Ah batteries for cordless operation.

The 13-inch cutting head uses dual exits for greater cutting efficiency, and automatic feed advances line without manual bumping. An adjustable auxiliary handle lets you tailor hand position for comfort, while the streamlined design is specified for maneuverability and reduced user fatigue. The included two 2.0 Ah batteries suit cordless trimming, and Power Share compatibility extends across WORX 20V and 40V tools and products. Its listed recommended use is trimming, not a trimmer-to-edger conversion.

Skip it if you need wheel edging as well as trimming; the WORX WG163 converts between those modes and includes an edger wheel.

The WG183 suits WORX Power Share owners seeking a cordless trimmer with a 13-inch dual-exit head and automatic feed. Its listed role is trimming, so choose a conversion-capable model if edging is part of the job.

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

#4 · Lightweight Cordless

4. BLACK+DECKER LST300

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

Best for: Quick trim-to-edge conversion.

Why it ranks #4: Automatic Feed Spool advances line without bumping, and the 5.7-pound 20V kit includes a battery, charger, and components for trimmer-to-edger conversion.

A tool-free-in-the-description switch from trimming to edging in seconds makes the BLACK+DECKER LST300 useful for yards that need both jobs. Its automatic feed spool advances line without bumping, while the included 20V battery and charger let you start with the listed cordless kit rather than sourcing those components separately.

The 12-inch cutting width and POWERDRIVE transmission, rated at 6,200 RPM in the supplied features, support cutting grass and weeds along a yard’s edges. Automatic Feed Spool advances line when needed, reducing pauses to bump the head. Convert the tool between trimming and edging in seconds to handle lawn borders with one device. The kit also lists a battery, charger, spool, and guard; its 5.7-pound weight is a practical handling consideration.

Skip it if you prefer a 14-inch cutting path for broader coverage; the BLACK+DECKER BESTA510 specifies that width and wheeled edging.

The LST300 suits buyers who want a cordless tool for both trimming and edging, with line feed that avoids bumping. Its 12-inch width is the boundary to weigh when choosing between compact coverage and a wider path.

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)

#5

5. CRAFTSMAN CMCST900B

• Dimensions L x W: 44.49"L x 9.25"W
• Size: 13 in

Best for: V20 owners adding an edger.

Why it ranks #5: Its automatic line advance feeds 0.065-inch line across a 13-inch swath, but this is a bare tool with battery and charger sold separately.

Automatic line advance and a 13-inch cutting swath make the CRAFTSMAN CMCST900B a practical V20-platform option for trimming and edging. Its telescoping pole supports an ergonomic setup, and the head turns for edging; note that this listing is for the tool only, with battery and charger sold separately.

The 13-inch swath covers more ground per pass than a 12-inch path, while automatic advance feeds 0.065-inch line without bumping. Switch between two speed settings to choose more power or more runtime for the task. The telescoping pole and turn-to-edge design support changing position for edging, and an integrated VERSATRACK hook provides a stated hanging-storage option. The kit includes a spool, auxiliary handle, and guard, but not the battery or charger.

Skip it if you need a battery and charger in the same kit; the BLACK+DECKER LST300 includes both with its cordless trimmer/edger.

This tool-only CRAFTSMAN suits V20 owners who want a 13-inch trimmer/edger with speed choices and hanging storage. It is a poor fit for shoppers who need a complete kit, since the battery and charger are separate.

Listed on Amazon as: CRAFTSMAN V20 WEEDWACKER Cordless String Trimmer Edger with Automatic Feed, 13 inch, Bare Tool Only (CMCST900B)

#6

6. SEYVUM MJ8603

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

Best for: Adjustable-head cordless edging kit.

Why it ranks #6: The listing specifies automatic line feed, 12-inch cutting width, two 2.0 Ah batteries, and an included fast charger for cordless trimming and edging.

A 90-degree adjustable cutting head and automatic line feed give the SEYVUM MJ8603 useful flexibility for tight spaces and routine line advancement. It converts between trimming and wheel edging, while the listed kit includes two 2.0 Ah batteries, a fast charger, and eight grass-cutter spool lines.

Adjust the head through 90 degrees and the auxiliary handle through 180 degrees to set up the tool for tight spaces and different working positions. For borders, convert it to wheel-edger mode; the spacer guard helps protect plants, landscape features, and lawn ornaments. Automatic line feed reduces the need to stop and advance line manually. Two 2.0 Ah batteries, a fast charger, and eight spool lines are listed, though the stated eight-pound weight may matter for longer sessions.

Skip it if you prioritize a lower listed weight; the BLACK+DECKER LST300 is specified at 5.7 pounds and includes a battery and charger.

This SEYVUM fits buyers who value adjustable positioning, wheel edging, and a supplied battery-and-line kit. Its eight-pound listed weight is worth considering if you expect long sessions or prefer a lighter tool for frequent maneuvering.

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 three-in-one yard trimming.

Why it ranks #7: Its title identifies a 21V 3-in-1 trimmer with auto feed, but the supplied specifications do not detail cutting width, battery capacity, or included components.

A 3-in-1 setup and automatic line feed are the Boltarc’s headline features, pairing multiple yard-care functions with line advancement during work. Its 21V cordless format also means the tool is not tied to an outlet, while the listed 47.16-inch length gives buyers a concrete sense of its overall size.

The title identifies this as a 3-in-1 trimmer, but the supplied information does not name the three functions, so check that they match your planned tasks. Automatic line feed is specified, which can reduce interruptions for manual line adjustment. The 21V cordless designation supports use away from an outlet. Dimensions are listed as 47.16 inches long by 6.28 inches wide; battery capacity, included accessories, runtime, and weight are not provided in the supplied details.

Skip it if you need a stated battery-and-charger kit; the Greenworks 2101602 listing specifies both a 2.0 Ah battery and charger.

This suits buyers seeking a 21V cordless trimmer with automatic feed and a stated 3-in-1 format. Because the supplied listing does not name those three functions or give battery details, verify that the tool’s configuration meets your yard-care needs.

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-yard edging and trimming.

Why it ranks #8: This 20V 12-inch trimmer-edger has a command-feed spool operated by button, not automatic advancement, and includes a battery and charger.

A head that tilts 90 degrees lets the WORX WG163 trim sloped ground and reach awkward spots, then switch to edging when lawn borders need a cleaner line. Its rubberized wheels guide the edger, and the push-button Command Feed supplies line on demand rather than requiring a bump.

The quick 2-in-1 conversion lets you move between trimming and edging without changing to a separate tool. When edging, rubberized wheels support and guide the cut for straighter lines; the 90-degree tilting head also helps reach sloped terrain and difficult spots. Command Feed gives line at a button press, while the listed kit includes two batteries, charger, edger wheel, spool, and guard. At 5.5 pounds, its stated weight is a practical point for maneuvering.

Skip it if you want a 13-inch path and a 40V kit; the WORX WG183 lists that width and two 2.0 Ah batteries.

The WG163 fits buyers who need edging as well as trimming, especially on sloped terrain or around awkward borders. Its 12-inch cutting path is the fit consideration for anyone prioritizing a wider pass over head adjustment.

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

#9

9. KOMASTY 20V Trimmer

• Dimensions L x W: 40"L x 8"W
• Size: 12 in

Best for: Compact storage for regular lawns.

Why it ranks #9: The 12-inch cordless model lists two 2.0 Ah batteries and a foldable shaft, but its supplied features do not specify an auto-feed system.

A shaft that folds 180 degrees in three ways gives the KOMASTY a specific storage advantage for crowded garages, apartments, or tight corners. Its adjustable head and rotatable handle also help position the 12-inch cordless trimmer for slopes, under benches, and hard-to-reach lawn edges.

The folding shaft supports vertical storage in limited space, while the 90-degree adjustable head and 180-degree rotatable handle help reach slopes and under-bench areas. An upgraded 9,500-RPM motor and 12-inch cutting width are specified for lawn trimming. The listing includes two 2.0 Ah batteries and a charger, so the power kit is accounted for. Its verified guidance says it is for regular lawn maintenance, not excessively thick, wet, or overgrown grass.

Skip it if you regularly cut heavy overgrowth; the BLACK+DECKER BESTA510 lists a 6.5-amp motor and POWERDRIVE transmission for tough weeds and overgrowth.

The KOMASTY suits apartment dwellers or homeowners short on storage who trim regular lawn grass and need adjustable reach. Its own guidance rules out excessively thick, wet, or overgrown grass, so match it to routine maintenance.

Listed on Amazon as: 20V Electric Cordless String Trimmer 2 x 2.0Ah Battery Powered with Charger

#10

10. Glenvera 20V Trimmer

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

Best for: Cordless trimming and edging.

Why it ranks #10: The listing describes a cordless 2-in-1 trimmer-edger, but supplied features do not confirm automatic line feed or list its included battery components.

A cordless 2-in-1 format lets the Glenvera switch between trimming and edging, so one tool can handle grass, weeds, and lawn borders without a cord limiting where you work. The title identifies it as a 20V, 12-inch model; the supplied product details provide few further specifications for judging its setup.

The stated trimmer-to-edger conversion combines two lawn tasks in one tool, while cordless operation avoids dependence on a power outlet during yard work. The title gives a 20V designation and 12-inch size, useful starting points when comparing tools. The supplied specifications list a six-pound weight and model YD2505. However, the provided features do not give battery capacity, runtime, line-feed type, or included charging equipment, limiting how fully buyers can assess operating workflow and kit completeness.

Skip it if you want automatic line feed and specified battery details; the SEYVUM MJ8603 lists auto feed and two 2.0 Ah batteries.

The Glenvera may suit buyers who want a cordless tool for both trimming and edging and can evaluate the kit from its full listing. Its supplied details leave battery, runtime, and line-feed specifics unclear, so compare those before choosing.

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