Top 4 Best Cordless String Trimmers for a Clean Lawn Edge

My old gas trimmer finally gave up last spring. The pull cord snapped, the carburetor was clogged, and I spent more time mixing fuel than actually cutting grass. So I started hunting for a cordless replacement. The problem? Every product page sounds the same. They all promise power, long battery life, and easy handling. Sorting through the noise took weeks. This list is the result of that search — a shortlist of four models that actually do what they claim.

A great cordless trimmer needs to start instantly, hold a charge long enough to finish the job, and feel balanced in your hands. You don’t want a machine that vibrates your arms numb after ten minutes. You also don’t want one that stalls on thick weeds. The models below cover different needs, from budget-friendly basics to multi-tool kits that replace several gas-powered machines.

After testing and comparing specs, the WORX WG163 stands out as the most versatile option for most homeowners. But the right pick depends on your yard size, whether you need edging capability, and how much weight you want to carry. Here is a closer look at the top four cordless string trimmers available on Amazon right now.

Here is a quick comparison of the key specs that separate these models.

Features	WORX WG163	BLACK+DECKER LST300	MZK 20V	WORX WG928 Kit
Cutting Width	12 inches	12 inches	12 inches	12 inches
Line Feed	Push-button	Automatic (AFS)	Automatic	Push-button
Edger Mode	Yes, 90° tilt	Yes, pivots	No	Yes, pivots
Included Items	Trimmer, spools	Trimmer, battery, charger	Trimmer, 8 spools	Trimmer, blower, 2 batteries
Best For	Edging precision	No-bump feeding	Budget buyers	Yard cleanup

WORX WG163 2-in-1

The WORX WG163 is the tool I keep coming back to. It converts from a string trimmer into a wheeled edger by pivoting the head and lowering the rubberized wheels. That transformation takes about five seconds. You get a straight, clean edge along driveways and sidewalks without bending over or fighting the machine for control.

The push-button line feed is a small detail that makes a big difference. You tap the button on the spool housing and fresh line advances instantly. No bumping the head on the ground, no taking the spool apart mid-job. The head also tilts a full 90 degrees, which helps when you need to reach awkward spots like under fences or along sloped terrain. The adjustable spacer guard keeps you from accidentally whacking your flower beds or landscape lights.

It is not the most powerful trimmer on this list. Thick, woody brush will slow it down, and you will need to let the tool do the work rather than forcing it through heavy growth. The 20V battery is also shared across many WORX tools, so if you already own other WORX yard equipment, this fits right into your existing setup. For routine weekly maintenance on a typical suburban lot, it handles everything without complaint.

• 12-inch cutting swath covers ground efficiently
• Converts to a wheeled edger for clean sidewalk lines
• Push-button line feed means no bumping or disassembly
• Adjustable spacer guard protects plants and hardscaping
• Battery and charger sold separately — check the listing

Best for: Homeowners who want one tool that trims grass and edges sidewalks with precision.

BLACK+DECKER LST300

If the WORX WG163 feels like it requires too much thought, the BLACK+DECKER LST300 is the opposite. The headline feature here is the Automatic Feed Spool (AFS). You never touch the line. The trimmer senses when line is short and feeds more automatically while you work. No buttons, no bumping, no guessing. Just pull the trigger and go.

The POWERDRIVE transmission spins the string at 6,200 RPM. That is enough speed to slice through ordinary grass and light weeds cleanly. The 12-inch steel deck adds durability and helps the trimmer glide along fence lines and patio edges. It also converts to an edger with a quick pivot, so you get two functions in one tool. The whole unit is lightweight, and the adjustable handle and height positions make it comfortable for people of different statures.

Reduced vibration is a real benefit here. Your hands and arms will feel less fatigued after thirty minutes of trimming compared to cheaper models. The trade-off? The automatic feed system can occasionally over-feed, wasting line if you hit a patch of thick growth. And the single 20V battery is fine for small to medium yards, but you may want a second battery if your lawn is large. It is quiet enough to use early in the morning without annoying the neighbors.

• Automatic line feed eliminates manual adjustments
• 6,200 RPM motor cuts through grass and light weeds
• 12-inch steel deck stands up to hard use
• 2-in-1 design converts to edger in seconds
• Reduced vibration keeps hands comfortable

Best for: Anyone who wants a fuss-free trimmer with automatic line feeding and a comfortable grip.

MZK 20V 12-Inch

Budget shoppers should look closely at the MZK 20V. It is the lightest option here at just 6.3 pounds, which makes a noticeable difference when you are trimming a large yard or have limited upper body strength. The adjustable handle helps you find a comfortable grip, and the 12-inch cutting width means you are not making extra passes compared to pricier models.

The upgraded motor spins at 8,000 RPM. That is the highest speed on this list, and it shows when cutting through denser grass. The automatic line feed works without manual intervention, so you can keep moving without stopping to adjust the string. MZK also includes eight replacement spools in the box. That is a full season of line for most people, which removes a common recurring cost.

There is no edger mode here. This is a dedicated trimmer, so you will need a separate tool or a steady hand for sidewalk edges. The build quality feels a step below the WORX and BLACK+DECKER models, with more plastic in the shaft and head. It is not fragile, but it does not have the same premium heft. For the price, though, it delivers solid performance and comes ready to work out of the box.

• 8,000 RPM motor handles thick grass with ease
• Weighs only 6.3 pounds for reduced fatigue
• Includes 8 replacement spools for extended use
• Automatic line feed keeps workflow uninterrupted
• Battery and charger included in the package

Best for: Budget-conscious buyers who want a lightweight trimmer with strong cutting speed and extra line included.

WORX WG928 Trimmer & Blower

The WORX WG928 is the overachiever of the group. It bundles the 12-inch trimmer/edger with a 360 CFM leaf blower, plus two batteries and a quick charger. If you are starting from scratch with yard tools, this kit replaces both your old trimmer and your gas blower. The turbine fan design on the blower moves air at 75 mph, which is enough to clear grass clippings off driveways and push leaves out of flower beds.

The trimmer side mirrors the WG163’s functionality. It pivots into edger mode, and the push-button line feed gives you fresh string on demand. The whole kit is remarkably light. The blower weighs just 4.4 pounds with the battery attached, and the trimmer comes in at 5.3 pounds. You can use both tools for extended periods without your arms giving out.

Two batteries make a real difference in practice. You can trim the front yard, swap in the fresh battery, and blow the clippings without waiting for a recharge. The quick charger tops up depleted batteries in a reasonable time. The main downside is the price, which runs higher than single tools. But when you factor in the cost of a separate blower, the kit often makes financial sense. Neither tool is built for commercial-grade abuse, but for residential maintenance they are plenty capable.

• Includes trimmer, blower, two batteries, and charger
• Blower delivers 360 CFM at 75 mph for yard cleanup
• Trimmer converts to edger with a head pivot
• Lightweight design — blower is 4.4 lbs, trimmer is 5.3 lbs
• Push-button line feed for instant string advancement

Best for: Homeowners who need both a trimmer and blower and want a single battery platform.

How We Chose These Products

I focused on cordless models from established brands with available replacement parts and batteries. Gas trimmers were excluded because they bring fuel mixing, pull cords, and maintenance headaches. Corded electric models were also skipped since dragging an extension cord defeats the purpose of a quick trim. Every pick here runs on a rechargeable battery and starts with a trigger pull.

The evaluation weighed cutting width, line feed mechanism, weight, and versatility. A 12-inch cutting width is the sweet spot for most residential yards. Push-button or automatic line feed saves time and frustration compared to older bump-feed systems. Weight matters because you hold the tool at arm’s length for extended periods. And the ability to convert to an edger adds real value for homeowners who care about clean sidewalk lines. Battery life was considered but not directly tested, so you should check current listings for runtime claims.

Buying Guide: What Really Matters

Start with your yard size. A small city lot can get by with a basic 20V trimmer and a single battery. A half-acre property will drain that battery quickly, so look for a kit with two batteries or a larger amp-hour rating. The MZK includes a 4.0Ah battery, which offers more runtime than the standard 1.5Ah or 2.0Ah packs that often ship with budget tools.

Consider the line feed system next. Bump feed requires you to tap the head on the ground to advance line. Automatic feed senses when line is short and advances it for you. Push-button feed gives you manual control without disassembly. Each works, but automatic and push-button systems are generally more convenient. Also check how easy it is to replace the spool. Some models require tools, others have tool-less spool replacement.

Weight and balance are easy to overlook until your arms start aching. A trimmer that weighs 6 pounds feels heavier when you are reaching under shrubs or edging along a long driveway. Look for adjustable handles and harness options if you have a large property. Finally, think about the brand ecosystem. If you already own WORX or BLACK+DECKER power tools, buying a trimmer from the same brand means sharing batteries across devices. That saves money and reduces clutter in your garage.

Our Top Recommendation

The WORX WG163 is the best cordless string trimmer for most homeowners. It trims grass effectively, converts into a precise edger with wheeled support, and offers push-button line feed. The 90-degree tilting head reaches awkward angles that other trimmers miss. It is not the cheapest option, but the versatility justifies the cost for anyone who wants clean edges along walkways and driveways.

If your budget is tight, the MZK 20V gives you strong cutting power and eight spare spools for less money. If you prefer to never touch the trimmer line, the BLACK+DECKER LST300 handles that automatically. And for those starting fresh with no yard tools at all, the WORX WG928 kit delivers a trimmer and blower on one battery platform. Pick the one that matches your yard size and your tolerance for manual adjustments.

Frequently Asked Questions

How long does a cordless string trimmer battery last?

Most 20V trimmers run between 15 and 30 minutes of continuous use on a standard battery. Larger amp-hour batteries, like the 4.0Ah pack included with the MZK, extend runtime closer to the 30-minute mark. Actual time depends on grass thickness and how often you run at full speed. For bigger yards, buy a second battery or choose a kit that includes two.

Can I use a cordless trimmer to edge my lawn?

Only if the trimmer has an edger mode. The WORX WG163 and WG928 both pivot the head to convert into an edger with guide wheels. The BLACK+DECKER LST300 also converts. The MZK does not offer this feature, so you would need to tilt the trimmer manually and accept less precise results along sidewalks and curbs.

What is the difference between bump feed and automatic line feed?

Bump feed requires you to tap the trimmer head on the ground to release more line. Automatic feed, found on the BLACK+DECKER LST300 and MZK, senses when line is short and advances it without any action from you. Push-button feed, used on WORX models, lets you advance line with a thumb press. Automatic feed is the most hands-off, while push-button gives you control over exactly how much line releases.

Are cordless trimmers as powerful as gas models?

Modern cordless trimmers handle routine grass and light weeds as well as most gas trimmers. They lack the raw torque for clearing heavy brush or saplings. For typical residential maintenance — trimming around trees, fences, and flower beds — a 20V cordless model gets the job done with less noise, no fumes, and no pull cord frustration. If you regularly cut through thick overgrowth, consider a higher voltage model or stick with gas.