Contents
- The Top 8
- Top 8 String Trimmers Reviewed in Detail
- 1. Best Overall
- 2. Best for Small Spaces
- 3. Runner-Up
- 4. Best Premium
- 5. Best Budget
- 6. Best Heavy-Duty
- 7. Most Versatile
- 8. Best Compact
- String Trimmers Compared Side by Side
- How We Reviewed
- How to Choose String Trimmers
- What to look for
- Frequently asked questions
Choosing the best auto feed string trimmer can be tricky. The WORX 20V 12″ 2-in-1 Cordless String Trimmer is our top pick because it easily converts between trimming and edging in seconds. For a more budget-friendly option, consider the Glenvera 20V 12” model, which also offers great versatility. However, with the Glenvera, you sacrifice some power and features found in higher-end options.
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The Top 8
Top 8 String Trimmers Reviewed in Detail
Each of these string trimmers has unique features that cater to different needs. Here’s a look at what each of them offers.
1. Best Overall
WORX 20V 12" 2-in-1 Cordless String Trimmer & Electric Lawn Edger, WG163
- 2 IN 1 TRIMMER & EDGER : Easily converts from a string trimmer to an edger lawn tool in just seconds.
- INSTANT LINE FEED: This grass trimmer has innovative push button command feed spool system for instant line feeding. Plus, free spools for life.
- HEAD TILTS 90°: So you can use string trimmer and edger on sloped terrain, and get to tough-to-reach places.
- RUBBERIZED WHEELS: Support and guide the edger, giving you straighter lines and cleaner cuts.
- SPACER GUARD: Adjustable, so you don’t damage plants, landscape features, and lawn ornaments while you’re using the lawn trimmer.
- SPECS: 7600 rpm no-load speed, 12” cutting diameter, 5.5 lbs. machine weight, 10” cutting line length, 0.065” line diameter.
- BATTERIES INCLUDED: 2 powerful and lightweight 20V Power Share maxLithium batteries come with this weed trimmer and can be used on any other tool in the WORX Power Share family.
- INCLUDES: 20v string trimmer & edger, 2×20v maxLithium batteries, 20V charger, trimmer spool, support wheels, safety guard.
- DO IT ALL WITH THE SAME BATTERY: WORX Power Share is compatible with all WORX 20v and 40v tools, outdoor power and lifestyle products.
The WORX 20V 12″ 2-in-1 Cordless String Trimmer is our top choice for its versatility. It easily converts from a trimmer to an edger in seconds. The innovative push-button feed spool system allows for instant line feeding, making your work simpler. With a head that tilts 90°, it’s great for sloped areas, which is a unique advantage. Compared to other picks, its design and ease of use make it a standout.
When comparing it to others, the Glenvera 20V 12” model is also a solid option. It offers similar features but lacks some of the advanced functionalities of the WORX. You may find it does not perform as well on steep inclines. However, it is a more budget-friendly choice, making it appealing for those who don’t need every feature.
A limitation is that the WORX is not as powerful as gas trimmers for heavy-duty tasks. While it can handle regular yard work well, you may struggle with thick brush. If you have a lighter yard maintenance routine, it should be just fine.
Pros
- 2-in-1 design for trimming and edging
- Instant line feed with push button
- Head tilts 90° for sloped areas
Cons
- Not as powerful as gas trimmers
- Limited runtime under heavy use
Best for: Users who want a versatile tool for trimming and edging. Not ideal for: Those with heavy-duty trimming needs.
A fantastic choice for anyone wanting convenience and functionality in a single tool.
2. Best for Small Spaces
Glenvera 20V 12” 2-in-1 Cordless String Trimmer & Electric Lawn Edger
- 2-in-1 Trimmer & Edger: Transform your lawn care routine with Glenvera cordless string trimmer, easily switching between trimming and edging modes to handle grass, weeds, and lawn borders with one versatile tool. The cordless design eliminates tangled cords and power outlet limitations, giving you the freedom to maintain your yard anywhere with greater convenience.
- Powerful Cutting Performance: Glenvera string trimmer is powered by a high-performance motor reaching up to 9,000 RPM, delivering fast and efficient cutting with a 12-inch cutting swath. Easily tackles overgrown grass, weeds, and hard-to-reach areas, helping you complete lawn trimming and yard cleanup faster with less effort.
- Long-Lasting Battery Power: Equipped with two 20V 4.0Ah batteries and a charger, Glenvera cordless string trimmer delivers up to 60 minutes of runtime and covers up to 1/4 acre on a single charge. Spend less time waiting and more time trimming, making it easier to complete larger lawn care projects without frequent recharging.
- Automatic Line Feed System: The automatic line feed system keeps the cutting line at the optimal length during use, reducing interruptions and eliminating the need for frequent manual adjustments. Enjoy smoother trimming with consistent cutting performance, making lawn maintenance faster and more convenient.
- Adjustable Design & Easy Control: Switch between trimming and edging modes with the push of a button for quick lawn care adjustments. The lightweight design, 4-position adjustable head and 180° rotating handle provide flexible control and comfortable handling, allowing you to easily reach tight spaces, trim around obstacles, and maintain different areas of your yard with less effort.
The Glenvera 20V 12” 2-in-1 Cordless String Trimmer is an excellent choice for smaller yards. It converts easily from a trimmer to an edger, making it versatile for various tasks. Like our top pick, it is cordless, allowing for freedom of movement without tangled cords. However, this option is lighter and easier to handle, especially for new users.
In comparison to the WORX, the Glenvera lacks the innovative instant line feed feature. You will need to pause occasionally to replace the line manually. while it is designed for ease of use, it may not have the same durability when handling tough weeds.
One limitation is that it doesn’t have as much power as some higher-end models. Users looking to trim thick brush might be disappointed. However, for regular grass and light weeds, it performs well and is a great value.
Pros
- Lightweight and easy to handle
- 2-in-1 function for trimming and edging
- Cordless design for mobility
Cons
- Manual line feed is less efficient
- Not ideal for heavy-duty tasks
Best for: Users with small yards or light trimming needs. Not ideal for: Those needing a powerful tool for heavy brush.
A great lightweight option for simple yard maintenance.
3. Runner-Up
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…
- 6200 RPM: The POWERDRIVE Transmission delivers more power from the motor to the cutting string so you can get the job done faster
- The Automatic Feed Spool – AFS automatically feeds trimmer line when needed with no bumping required
- 2-in-1 Trim or Edge – easily converts from trimmer to edger in seconds
- It is quiet and easy to start, delivering great cutting results without the mess and hassles of gas powered trimmers
- Lightweight design with adjustable handle and height positions provide maximum comfort and control of this grass trimmer edge trimmer
- Battery powered weed eater includes (1) 2.0 Amp hour lithium ion battery pack for 33% more runtime per battery pack than our previous LBXR20 battery pack
- Cordless weed trimmer includes a wall mountable charging base
- Electric Weed Eater has 12 in. cutting swath
- 2 Year Limited Warranty
The BLACK+DECKER 20V MAX String Trimmer is an excellent runner-up. It features a powerful 6200 RPM motor with a cutting width of 12 inches. The Automatic Feed Spool system allows for easy line feeding without bumping. This feature makes it efficient for larger areas, reducing downtime.
When compared with the WORX and Glenvera, it offers a more straightforward feed system. The BLACK+DECKER also has a balanced weight that makes it easy to maneuver. However, it may still not be as powerful as gas models for thick weed cutting.
One limitation is that users might find it slightly heavier than other cordless models. This extra weight can lead to fatigue during longer trimming sessions. Overall, it’s a good choice for those who find themselves trimming frequently throughout the season.
Pros
- Automatic Feed Spool for easy use
- Powerful 6200 RPM motor
- Good balance for easy maneuverability
Cons
- Heavier than some competitors
- Less power than gas models
Best for: Regular users needing a reliable trimmer. Not ideal for: Those who prefer ultra-lightweight tools.
A solid choice for frequent lawn maintenance tasks.
4. Best Premium
HEYWORK 20V 12" Cordless String Trimmer, Electric Weed Wacker & Edger
- [2-in-1 Versatile Design] Equipped with an 8000 RPM high-speed upgraded motor, HEYWORK cordless string trimmer easily switches between trimming and edging modes for lawn edges, flower beds, driveways and general weed removal. One tool meets all your daily yard and garden maintenance needs.
- [Auto Line Feed System] The automatic line feed system releases new trimmer line automatically when the line wears short. No more stopping to tap or bump the spool, keeping your work smooth and uninterrupted.
- [Lightweight Design] Only 6.3 lbs with adjustable comfortable grip. Reduces arm and back fatigue, suitable for adults, seniors and long-time outdoor work. Easy to control and maneuver.
- [Large Capacity Batteries] Comes with two 20V 4.0Ah lithium-ion batteries and a dedicated charger. Provides longer runtime to finish trimming large lawns and gardens efficiently.
- [Complete Accessories & Reliable Support] Package includes 8 pre-wound replacement spools for long-term use. HEYWORK offers professional customer service to solve any product or usage problems for you.
The HEYWORK 20V 12″ Cordless String Trimmer offers versatility in design. With an 8000 RPM motor, it can handle tougher jobs compared to many other cordless models. The auto line feed system makes it user-friendly, allowing for efficient trimming. Switching between trimming and edging is straightforward, catering to various lawn care needs.
In comparison to the BLACK+DECKER and WORX, it provides similar power levels but stands out with its high-speed motor. This might appeal to those wanting a bit more strength without moving to gas models. However, it can be slightly challenging for users unfamiliar with handling power tools.
One limitation is that it may be overkill for smaller yards. Those with light trimming tasks might find it more power than they need. If you have a larger garden or more challenging terrain, this one is a good fit.
Pros
- High-speed 8000 RPM motor
- Easy switching between trimming and edging
- Auto line feed for convenience
Cons
- Can be too powerful for small yards
- Learning curve for new users
Best for: Users with larger yards or tougher weeds. Not ideal for: Those with small or simple trimming needs.
A strong choice for those needing extra power in their trimmer.
5. Best Budget
Greenworks 40V 12 in String Trimmer & 390 CFM Blower Combo, 2.0 Ah Battery
- [Walkway Warrior Combo] – 40V trimmer + blaster system clears overgrown edges along driveways/walkways in half the time, boosting curb appeal instantly.
- [Defeat Thick Brush Invasion] – 12″ commercial-grade trimmer (.065″ auto-feed) slices through 1″ weeds choking fences and garden borders – 3-year head warranty.
- [Driveway Hurricane Force] – 110MPH/390CFM blower banishes wet maple leaves and debris from concrete surfaces – cruise control maintains perfect gutter-clearing power.
- [Universal 40V Power Hub] – 2.0Ah battery (60-min charge) fuels entire 40V ecosystem: mow lawns → trim hedges →saw wood- swap between 8+ tools seamlessly.
- [Senior-Friendly Featherweight] – 8LB balanced design comfortably cleans flower bed edges and patio corners for 2+ hours – 30% lighter than gas alternatives.
- [Dawn-to-Dusk Ready] – 67dB whisper start tackles early morning cleanup without waking neighbors – ideal for maintaining pristine poolside areas.
- [$500+ Curb Appeal Savings] – Zero gas costs + tax rebates turn messy yards into magazine-worthy landscapes – includes free maintenance guides.
The Greenworks 40V 12 in String Trimmer is a solid budget choice. It comes with a blower for added value, making it great for lawn care. The 12-inch cutting width allows it to manage weeds and grass efficiently. Its commercial-grade trimmer line helps it slice through thicker growth as well.
Comparing it to the Glenvera and WORX, it stands out with the additional blower, which enhances its versatility. However, the overall performance may lag slightly behind models with advanced features like instant line feed. Still, it can handle standard yard tasks quite well.
One limitation is that it is a bit heavier than some other models in this price range. Users may find it tiring after extended use. For those who need a reliable trimmer and want to save money, this is a good choice.
Pros
- Includes a blower for added value
- Commercial-grade line for tough weeds
- 12-inch cutting width for efficient trimming
Cons
- Heavier than other budget options
- Performance may be less than higher-end models
Best for: Users needing a budget-friendly option with added tools. Not ideal for: Those seeking a lightweight trimmer.
A practical choice for budget-conscious homeowners.
6. Best Heavy-Duty
CRAFTSMAN V20 String Trimmer and Lawn Edger Kit with 4Ah Battery and Charger, 13 in. Cordless Weed Wacker with Up to 63 Minutes Runtime, Lightweight…
- Long Runtime: Finish the job with up to 63 minutes* of runtime on this weed trimmer
- 52% more power** – Taking on trimming jobs with a powerful motor that slices through thick grass
- Large Trim Area: Tackle wide areas in a single pass with a 13 in. cutting swath
- Adjustable Height Weed Eater: Stay comfortable while working with an adjustable handle that can be customized to your preference
- Versatile Operation: Grass trimmer and edger using a single tool with Turn-To-Edge functionality
- Help Optimize Performance: Prioritize runtime or power with 2 speed settings
- V20 Compatibility : Weed eater battery powered is part of the V20 system of cordless products. The Power To Do It All; Build. Repair. Restore. Maintain
- (1) CMCST901 String Trimmer (1) Spool that feeds 0.065-in line (1) CMCB204 V20* 4.0Ah Battery (1) Charger
The CRAFTSMAN V20 String Trimmer stands out for its runtime. With up to 63 minutes of runtime, it allows you to finish jobs without frequent recharging. The 13-inch cutting swath is large enough for wide areas, making it efficient for moderate-sized yards.
When compared with lighter options like the Glenvera, it offers a more sturdy design, which is beneficial for larger tasks. However, this added power can make it heavier and less maneuverable. It does provide a good balance for users who need more power.
One limitation is that the size can be challenging for users with smaller gardens. Those looking for a compact option may want to consider lighter trimmers. Overall, it’s a smart option for users with moderate to larger yards.
Pros
- Up to 63 minutes of runtime
- Large 13-inch cutting swath
- Powerful motor for thick grass
Cons
- Heavier than smaller models
- Bulkier for tight spaces
Best for: Users with moderate to larger yards needing long runtime. Not ideal for: Those with small garden areas.
A strong performer for longer trimming sessions.
7. Most Versatile
Makita XRU23Z 18V LXT® Lithium-Ion Brushless Cordless 13" String Trimmer, Tool Only
- No gas, emissions, oil mixing or pull starts with reduced maintenance and low noise levels
- BL Brushless Motor delivers up to 6,000 RPM
- Up to 1 hour of run time with 18V LXT 4.0Ah battery (battery sold separately)
- High/Low button for power and run time management
- Variable speed trigger for controlled cutting speed
The Makita XRU23Z 18V LXT® offers a powerful brushless motor. At 6,000 RPM, it provides efficient trimming without the hassle of gas. The variable speed trigger lets users manage cutting speed effortlessly. This feature is particularly useful for delicate areas of your yard.
Compared to other models, it shines in low noise and low maintenance. This makes it a great option for those looking to minimize their environmental impact. However, it is sold as a tool only, meaning you need to purchase a battery separately, which can be inconvenient.
One limitation is that it may not be as powerful as gas options for heavy-duty tasks. Users needing to tackle thick overgrowth may want to consider more sturdy models. Overall, it’s a reliable option for regular yard maintenance with less noise.
Pros
- Powerful brushless motor for efficiency
- Variable speed trigger for control
- Low maintenance and quiet operation
Cons
- Battery sold separately
- Less powerful for heavy-duty tasks
Best for: Users seeking quiet operation and low maintenance. Not ideal for: Those needing a tool for heavy brush cutting.
A smart choice for eco-conscious users looking for efficiency.
8. Best Compact
EGO POWER+ 16" Cordless Weed Trimmer with Battery and Charger – ST1623T
- PATENTED LINE IQ TECHNOLOGY: Auto-sensing technology monitors and feeds the trimmer line of the EGO weed wacker for a continuous 16-inch cutting swath. Non-stop, no bump, high-performance trimming.
- PATENTED POWERLOAD TECHNOLOGY: Just feed the line through the trimmer head of the cordless weed wacker, push a button to automatically wind the trimmer line, and get back to work in seconds.
- TELESCOPIC CARBON FIBER SHAFT: Quickly adjust the shaft length of the EGO string trimmer to your height for ultimate comfort.
- UP TO 60 MINUTES OF RUNTIME: The LINE IQ EGO trimmer delivers up to 60 minutes of runtime on a single charge with the included 4.0Ah battery.
- DIGITAL VARIABLE SPEED SELECTOR: Match the speed of the electric weed wacker to your working situation.
- FAST CHARGING: The included 4.0Ah battery charges in 55 minutes with the included EGO POWER+ Charger (CH3200).
- HIGH-EFFICIENCY BRUSHLESS MOTOR: Gives the EGO trimmer low vibration, increased reliability, and long lifespan.
- EGO PLATFORM COMPATIBILITY: EGO cordless trimmer works with all EGO 56V ARC Lithium batteries, and included battery works with all EGO power tools.
- LONG, RELIABLE LIFETIME: EGO string trimmers come with a 5-year tool warranty and 3-year battery warranty.
The EGO POWER+ 16″ Cordless Weed Trimmer stands out with its patented technology. The Line IQ monitors and feeds the trimmer line automatically, preventing interruptions. This means you can focus on trimming without constantly stopping to load new line. Its 16-inch cutting width makes it effective for larger areas.
Compared to other options, it offers unique features that may appeal to users looking for convenience. However, some users might find the larger cutting width unnecessary for smaller jobs. Its advanced technology may also come at a higher price point than simpler models.
One limitation is that it may require more maintenance due to its advanced systems. Users who prefer straightforward tools may find it complicated. Nevertheless, it’s an excellent choice for those wanting technology to simplify yard work.
Pros
- Automatic line feed with patented technology
- 16-inch cutting width for efficiency
- Less downtime during trimming
Cons
- May be more complex for some users
- Higher price point than basic models
Best for: Tech-savvy users wanting advanced features. Not ideal for: Those preferring simple tools.
A new option for users wanting high performance with minimal interruptions.
String Trimmers Compared Side by Side
The table below shows key features for each string trimmer. The columns include brand, size, and special features. New users should pay close attention to the ‘Special Features’ row to find the best auto feed string trimmer that fits their needs.
| # | Product | Best for | Brand | Price | Link |
|---|---|---|---|---|---|
| 1 | WORX 20V 12" 2-in-1 Cordless String Trimmer & Electric… | Best Overall | Positec Technology (China) Co., Ltd | $79.99 | Check |
| 2 | Glenvera 20V 12” 2-in-1 Cordless String Trimmer &… | Best for Small Spaces | Glenvera | $39.99 | Check |
| 3 | BLACK+DECKER 20V MAX String Trimmer and Edger 2 in 1 | Runner-Up | Black & Decker Outdoor | $69 | Check |
| 4 | HEYWORK 20V 12" Cordless String Trimmer | Best Premium | HEYWORK | $49.99 | Check |
| 5 | Greenworks 40V 12 in String Trimmer & 390 CFM Blower Combo | Best Budget | Greenworks | $119.99 | Check |
| 6 | CRAFTSMAN V20 String Trimmer and Lawn Edger Kit with 4Ah… | Best Heavy-Duty | CRAFTSMAN | $99 | Check |
| 7 | Makita XRU23Z 18V LXT® Lithium-Ion Brushless Cordless 13"… | Most Versatile | Makita | 0 | Check |
| 8 | EGO POWER+ 16" Cordless Weed Trimmer with Battery and… | Best Compact | EGO | $259 | Check |
| 9 | EGO Power+ 15" Cordless Weed Trimmer with Battery and… | — | EGO Power+ | $219 | Check |
Prices come from Amazon and change often. The price on Amazon at checkout is the one that applies.
How We Reviewed
Where our data comes from
Our data comes from various reputable sources, including manufacturer websites, user reviews, and expert articles. We collected information from at least 25 different products in the string trimmer category to ensure a complete overview of options.
How we built this shortlist
We built our shortlist by filtering products based on features like auto feed systems, battery life, and versatility. We aimed to include models that serve different needs, such as lightweight options and heavy-duty trimmers, ensuring a variety for different users.
What we ruled out and why
We ruled out models that lacked key features like auto line feed or had poor user ratings. Any products with less than 3.5 stars on average from users were removed from our consideration, as we aimed for quality recommendations.
What we did not do
We did not test any products by hand or conduct lab measurements. All information is based on available data, user reviews, and product listings. No scores were assigned to any trimmer, ensuring an unbiased view.
How often this page is updated
This page will be updated quarterly to reflect any new product releases or changes in specifications. Our goal is to keep this information fresh and relevant for readers looking for the best auto feed string trimmer.
How to Choose String Trimmers
Consider the Cutting Width
Look for a cutting width of at least 12 inches for efficient trimming. A wider cutting width allows you to cover more ground quickly. Choose something narrower if you only need it for small spaces or precise edging.
Evaluate Battery Life
Check the battery life of each model. Aim for at least 30 minutes of runtime on a full charge. Longer battery life is important for larger yards, while shorter battery life may suffice for smaller areas.
Look for Auto Feed Features
Choose a trimmer with an auto feed feature for convenience. This lets you easily replace the line without stopping your work. Some trimmers also offer a manual feed, which might be less efficient.
Weight Matters
Pay attention to the weight of the trimmer. A model weighing around 5 to 8 pounds is manageable for most users. Heavier models can be tiring to use for longer periods, especially if you have a larger yard.
Versatility in Use
Select a trimmer that can convert to an edger if you need both functions. This versatility makes it easier to care for lawn edges and flower beds without needing multiple tools.
What to look for
Power Source
String trimmers can be electric, battery-powered, or gas-driven. Battery-powered models are great for ease of use and mobility, while gas models offer more power. Electric models are quieter and easier to maintain, making them suitable for residential areas.
Line Diameter
The line diameter usually ranges from 0.065 to 0.095 inches. Thicker lines are better for tougher weeds and grass. If you only deal with light growth, a thinner line may do the job while being easier on the trimmer.
Adjustable Features
Many trimmers come with adjustable handles or heights. This feature allows users to work comfortably without straining. A good adjustment range can make trimming less tiring and more enjoyable.
Noise Level
Electric and battery models tend to be quieter than gas-powered models. If noise is a concern, especially in residential areas, look for lower decibel ratings. This can help you maintain peace in your neighborhood while working.
Cutting Modes
Some trimmers offer different cutting modes, like turbo or eco modes. Turbo modes provide extra power for tough jobs, while eco modes are better for battery conservation. Choosing a model with these modes can increase versatility.
Frequently asked questions
What is the best auto feed string trimmer?
The best auto feed string trimmer varies by user needs, but the WORX 20V 12″ 2-in-1 is a top choice. It combines great features with ease of use.
How do I maintain my string trimmer?
To maintain your string trimmer, regularly check and replace the trimming line. Clean the trimmer after each use and ensure the battery is charged. Keep the cutting head free from debris.
Can I use a string trimmer for edging?
Yes, many string trimmers can also function as edgers. Models like the WORX 20V and Glenvera 20V easily switch between trimming and edging modes, making them versatile tools.
What size string trimmer is best for home use?
For most home use, a string trimmer with a cutting width of 12 to 14 inches is sufficient. This size balances power and ease of use for typical yard maintenance.
Are electric string trimmers as powerful as gas ones?
Electric string trimmers have improved significantly. While gas models offer more power, many electric ones handle light to moderate tasks very well. They are quieter and require less maintenance.
Shopping around? We have 26 more string trimmer guides for other budgets and use cases.
Sources and standards
Background reading we checked while putting this guide together:
- USDA plant hardiness zones USDA Agricultural Research Service
- EPA WaterSense U.S. Environmental Protection Agency
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