Top Automatic Electric String Trimmers for Effortless Edging
The Worx WG163 is our top pick for most homeowners. It features a unique auto feed spool that releases new line when you rev the motor, so no bumping is needed. The main limitation is that it is corded, limiting your range to the length of the extension cord.
Automatic electric string trimmers save you from the hassle of manually feeding line. They are ideal for keeping your lawn edges clean without stopping to adjust the trimmer line. We compared the most popular models to find the ones that truly deliver on convenience and performance.
Whether you prefer corded or battery-powered, there is an automatic trimmer that fits your needs. Our selection includes lightweight models for small yards and powerful ones for tougher weeds, all with features that make trimming less of a chore.
What matters most
The shortlist, ranked
Worx WG163 12 Amp 14 inch Corded Electric String Trimmer
The Worx WG163 is a powerful corded trimmer that features a unique auto feed spool. Instead of bumping the head, you simply rev the motor and the line advances automatically. It has a 14 inch cutting swath and a tiltable head for edging. Owners report that the auto feed works consistently, and the 12 amp motor handles thick grass without bogging down.
Pros
- Auto feed spool eliminates bumping
- Powerful 12 amp motor
- Tiltable head for edging
Cons
- Corded limits mobility
- Some users find the handle less comfortable
BLACK+DECKER LSTE525 20V MAX Lithium Ion Cordless String Trimmer Edger
This cordless trimmer from BLACK+DECKER uses a PowerDrive transmission for more torque. It features an automatic feed spool that advances the line when you press a button, or you can bump the head. The 20V battery provides enough run time for typical suburban lots. It converts to an edger with a push of a button, adding versatility.
Pros
- Cordless convenience
- Easy conversion to edger
- Automatic feed spool
Cons
- Battery life may be short for large yards
- Line feed can occasionally jam
Greenworks 40V 16 inch Cordless String Trimmer
Greenworks offers a 40V trimmer with a 16 inch cutting swath and a brushless motor for efficiency. It features an automatic feed system that lets you bump or use the command feed button. The battery is compatible with other Greenworks 40V tools. Users appreciate the long runtime and the ability to handle heavier weeds.
Pros
- High power for tough jobs
- Long runtime
- Compatible with Greenworks 40V system
Cons
- Heavier than some competitors
- Battery and charger sold separately (check package)
Sun Joe SJ-735E 8.5 Amp 15 Inch Corded Electric String Trimmer
The Sun Joe SJ-735E is a versatile corded trimmer with a 15 inch cutting swath. It features a unique auto feed system that advances line when you push a button on the handle. It also converts to an edger with a 180 degree rotating head. The 8.5 amp motor is sufficient for most residential tasks, and the price point is attractive.
Pros
- Affordable price
- Converts to edger easily
- Auto feed button on handle
Cons
- Corded operation
- Motor less powerful than others
DEWALT DCST972X1 20V MAX XR Brushless String Trimmer
DEWALT’s XR trimmer is built for heavy use. It has a brushless motor that delivers up to 6,000 RPM. The auto feed system is a bump feed with a quick-load spool. The trimmer features a variable speed trigger and a high strength gear case. It comes with a 5 Ah battery and charger, offering excellent runtime.
Pros
- Brushless motor for efficiency
- Variable speed control
- Quick load spool
Cons
- Expensive
- Heavier than many cordless models
EGO Power+ ST1511T 15-Inch 56-Volt Lithium-Ion Cordless String Trimmer
EGO Power+ trimmer uses a 56V battery for outstanding power and runtime. It features a dual feed system: you can bump the head or use the lever to advance line. The brushless motor is quiet and efficient. The telescoping shaft and adjustable handle make it comfortable for various heights. It can also attach to other EGO accessories.
Pros
- Excellent power and runtime
- Low noise operation
- Adjustable shaft and handle
Cons
- High price
- Battery not compatible with other brands
CRAFTSMAN V20 20-Volt MAX Cordless String Trimmer
The Craftsman V20 is a straightforward trimmer with a bump feed head. It is lightweight at 6.7 pounds, making it easy to maneuver. The 20V battery provides enough power for small to medium yards. It has a 12 inch cutting swath and an adjustable auxiliary handle. Owners appreciate the simplicity and the automatic line feed via bumping.
Pros
- Lightweight and easy to handle
- Bump feed is simple
- Compatible with Craftsman V20 system
Cons
- Smaller cutting width
- Battery runtime is modest
How they stack up
| # | Model | Power Source | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Worx WG163 12 Amp 14 inch Corded Electric String Trimmer | Corded Electric | Most homeowners seeking a reliable auto feed system | 9.4 | Check price |
| 2 | BLACK+DECKER LSTE525 20V MAX Lithium Ion Cordless String Trimmer Edger | 20V MAX Lithium Ion | Small to medium yards with cordless convenience | 9.0 | Check price |
| 3 | Greenworks 40V 16 inch Cordless String Trimmer | 40V Lithium Ion | Large yards needing extended run time and power | 8.8 | Check price |
| 4 | Sun Joe SJ-735E 8.5 Amp 15 Inch Corded Electric String Trimmer | Corded Electric | Budget-conscious buyers wanting a 2-in-1 trimmer | 8.6 | Check price |
| 5 | DEWALT DCST972X1 20V MAX XR Brushless String Trimmer | 20V MAX XR Lithium Ion | Professional-grade performance and durability | 8.9 | Check price |
| 6 | EGO Power+ ST1511T 15-Inch 56-Volt Lithium-Ion Cordless String Trimmer | 56V Lithium Ion | Premium battery performance and low noise | 9.2 | Check price |
| 7 | CRAFTSMAN V20 20-Volt MAX Cordless String Trimmer | 20V MAX Lithium Ion | Basic trimming with reliable bump feed | 8.0 | Check price |
Frequently asked questions
What does automatic feed mean on a string trimmer?
Automatic feed means the trimmer line is advanced automatically without stopping to manually pull it. Some systems use bump feed, where you tap the head on the ground, while others use a button or motor rev to release more line.
Is a corded or cordless trimmer better?
It depends on your yard size and mobility needs. Corded trimmers offer unlimited runtime and consistent power, but you must deal with a cord. Cordless trimmers are convenient but limited by battery life. For small yards, cordless is often sufficient; for large yards, corded or high voltage cordless is recommended.
How do I know when to replace the trimmer line?
You should replace the line when it becomes too short to cut effectively, typically when it is less than 2 inches long. Also, if the line breaks frequently or the trimmer vibrates excessively, it may be time to replace it.
Can I use any thickness of line in my trimmer?
No, you should use the line thickness recommended by the manufacturer. Using too thick a line can damage the motor or feed mechanism, while too thin a line may break easily and not cut effectively.
What is the best way to store a cordless trimmer?
Store the trimmer in a dry place, preferably indoors. Remove the battery and store it separately in a cool, dry location. Charge the battery to about 50% if storing for long periods to maintain its health.
Why does my trimmer line feed out too much?
This can happen if you bump the head too hard or too often. Try tapping gently and only when needed. On auto feed models, excessive revving can cause too much line to feed. Adjust your technique to avoid wasting line.
Are automatic feed trimmers more expensive?
Automatic feed mechanisms are common and do not necessarily add significant cost. Many budget models include bump feed. Advanced auto feed systems might be found on mid to high range trimmers, but there are affordable options like the Worx WG163.
Can I use a trimmer as an edger?
Many trimmers have a rotating head that allows you to turn the cutting head vertically for edging along sidewalks and driveways. This feature is convenient, but not all models have it. Check the product specifications for edging capabilities.
The verdict
For most homeowners, the Worx WG163 is the best choice because its auto feed spool is genuinely hands-free, it has ample power, and it is budget friendly. If you need cordless convenience, the EGO Power+ ST1511T offers exceptional performance and runtime, justifying its premium price. For professionals, the DEWALT DCST972X1 provides durability and power. Choose based on your yard size and budget, but the Worx is the most practical for the average user.
