String Trimmers and Edgers: The Complete Buying Guide

On this page (18 sections)

1. What is a weed trimmer?
2. Is a weed eater a tool?
3. What does a weed trimmer cut?
4. How does a string trimmer work?
5. What are the main types of weed trimmers?
6. What is the difference between trimming and edging?
7. How do you choose a cutting width?
8. Is a straight shaft or curved shaft better?
9. What line system should you choose?
10. What features help with edging?
11. How do you trim tall weeds and brush?
12. Which featured products fit different yard needs?
13. What should you check before buying?
14. Which accessories make a string trimmer easier to use?
15. Should you buy a combo kit?
16. How should you maintain a weed trimmer?
17. Explore string trimmers & edgers by topic
18. What is the best weed trimmer for your yard?

A weed trimmer is a handheld tool that cuts grass and weeds with a spinning line or blade. It reaches around trees, fences, posts, flower beds and other places where a mower cannot cut cleanly.

The terms weed eater, weed wacker and string trimmer often describe the same type of lawn tool. The main differences are the power source, shaft design, cutting system, line feed and whether the head converts into an edger.

This guide explains what each choice means in daily yard work. It also shows where the featured products fit, including one item that is not a lawn tool and should not be used for trimming.

What is a weed trimmer?

A weed trimmer is a motor-powered lawn tool with a rotating cutting head. Most use flexible nylon line that spins inside a guard and cuts grass when the line contacts the plant.

The operator holds the tool by its shaft and guides the head along lawn borders or through patches of grass. A trimmer is useful for finishing work after mowing, clearing narrow strips and reaching uneven ground.

A trimmer does not replace every lawn tool. Compare string trimmers and brush cutters when choosing for heavier growth.

It is made for grass and weeds, while thick woody growth may require a brush cutter, hedge trimmer or chainsaw.

The cutting head usually includes a spool of line. EGO trimmer line replacement explains how to reload a specific model.

As the line wears down, the tool needs more line through a bump-feed, automatic-feed or push-button system.

Is a weed eater a tool?

Yes, a weed eater is an outdoor power tool. Weed Eater began as a brand name, but many people now use weed eater as a general term for a string trimmer.

“String trimmer” describes the cutting method. “Weed wacker” and “weed eater” describe the same broad tool category in everyday speech.

The names do not tell you whether a model is gas powered, battery powered or corded. Check the power source, cutting width and line system before choosing.

Our guide to weed eater vs string trimmer explains the naming differences and the features that matter more than the label.

What does a weed trimmer cut?

A weed trimmer cuts grass, soft weeds and growth around lawn obstacles. It is especially useful where mower decks cannot fit or where wheels cannot follow the ground.

Common jobs include:

• Trimming grass beside fences and walls
• Cleaning around tree trunks and posts
• Cutting grass near flower beds
• Reaching beneath low branches
• Clearing narrow strips beside driveways
• Shaping the edge of a lawn
• Removing light weeds from uneven ground

The line diameter and motor power affect the type of growth a trimmer can handle. Thin line works well for light grass, while heavier line can suit denser weeds when the tool supports it.

Do not assume a larger cutting width means more cutting strength. Width affects how much ground you cover per pass, while power and line size affect how the head handles thicker growth.

How does a string trimmer work?

A string trimmer uses a motor to spin a spool of flexible line at high speed. The line becomes stiff from centrifugal force and cuts plants when it strikes them.

A guard covers part of the spinning head to direct debris away from the operator. The guard also helps limit the cutting area and protects nearby surfaces.

The line wears down when it contacts grass, soil, pavement and hard objects. DeWalt trimmer string replacement covers a model-specific reload.

A spool system then releases more line, either through a bump, an automatic feed or a button.

The operator controls the cut by changing the head angle and moving the tool in a steady arc. Keep the line parallel to the ground for ordinary trimming, and use a vertical position only when the tool supports edging.

Read how to use a weed trimmer before your first session. Correct stance, line height and movement help you avoid scalping the lawn or striking nearby objects.

What are the main types of weed trimmers?

The main weed trimmer types are battery powered, corded electric and gas powered. Each one suits a different yard size, work pattern and tolerance for charging, cables, noise and maintenance.

Battery-powered weed trimmers

Battery models are convenient for yards where a power cord would be awkward. They start with a switch or trigger and do not require fuel mixing.

Battery tools vary by voltage, battery capacity and platform. Some include batteries and chargers, while others require a separate battery purchase.

The WORX 20V 12" 2-in-1 Cordless String Trimmer has a 12 in cutting diameter, weighs 5.5 lb and includes 2 20V batteries and a charger. Its head tilts 90 degrees, and its rubberized wheels support the edger function.

The WORX model suits readers who want one tool for trimming and edging. Its adjustable spacer guard helps keep the line away from plants and lawn ornaments, while the push-button feed releases line when needed.

A 12 in cutting width favors control around beds and borders. It covers less ground per pass than a wider model, but the narrower head can be easier to guide in tight areas.

Its 0.065 in line and 7,600 rpm no-load speed describe the cutting setup. The tool is compatible with WORX Power Share 20V and 40V tools, which may matter if you already use that battery family.

For more battery choices, compare our best electric string trimmer guide.

Corded electric weed trimmers

Corded electric models suit smaller yards with an accessible outdoor outlet. They provide steady power while connected, but the cord limits movement and needs careful handling.

A cord retention system can help prevent accidental disconnection. Keep the cable behind you and away from the cutting head during use.

The BLACK+DECKER Weed Wacker with Auto Feed has a 14 in cut path and a 6.5 amp motor. It is a corded electric tool with a wheeled edge guide, adjustable handle and height positions.

This model suits a buyer who wants a wide cut path and does not want to charge batteries. Its automatic feed releases line without bumping, and its cord retention system helps keep the connection secure while working.

The 14 in width can cover more grass per pass than a 10 in or 12 in head. A wider path can also require more room around plants, borders and ornaments, so use the guard and edge guide carefully.

The adjustable handle and height positions help different users set a more comfortable working position. The tool includes an auxiliary handle, guard and AF-100 spool.

Gas-powered weed trimmers

Gas trimmers suit larger properties, long work sessions and areas far from an outlet. They generally require fuel handling, engine maintenance and more attention to starting and storage.

Gas models may offer more sustained work time than a battery with limited charge. They can also be heavier, louder and more demanding to maintain.

Compare the trade-offs in our guide to gas vs electric weed eaters. Your yard size, storage space and tolerance for fuel maintenance should guide the choice.

What is the difference between trimming and edging?

Trimming cuts grass horizontally, while edging creates a cleaner vertical boundary along a sidewalk, driveway or bed. Some tools convert between the two modes by rotating the head or changing the tool position.

Trimming is useful when grass grows taller than the mower can reach. The line moves through the grass and removes the excess growth.

Edging defines the boundary between lawn and a hard surface. For tools that shape or deepen that border, compare lawn edger and trencher options.

The head is usually turned so the line cuts along the border instead of across the lawn surface.

A wheeled edge guide can help keep the cut line straight. A spacer guard can help protect plants, ornaments and other features near the work area.

Read Can You Use a String Trimmer as an Edger? before assuming every trimmer can edge safely. Some models need a dedicated conversion feature, while others are intended only for horizontal trimming.

How do you choose a cutting width?

Choose cutting width by balancing coverage and control. A wider head covers more ground per pass, while a narrower head can be easier to guide around tight borders.

Common widths range from about 10 to 14 in in the products here:

The BLACK+DECKER 20V MAX Weed Eater has a 10 in cutting width and weighs 4.5 lb for the trimmer. Its head rotates 180 degrees for edging, and the kit includes 2 batteries and a charger.

This BLACK+DECKER kit suits a small yard or a homeowner who values low handling weight. It also includes a cordless sweeper with a 130 mph hard surface leaf blower, so it covers trimming, edging and light debris clearing.

The 20V MAX 1.5Ah batteries hold a charge for up to 18 months, according to the product information. The kit includes 2 batteries, which gives you a second battery for extended coverage or rotation.

The smaller 10 in width favors control rather than maximum speed. Its adjustable height and handle can help you set the tool for your reach.

Is a straight shaft or curved shaft better?

A straight shaft generally suits tall users, longer reach and work beneath obstacles, while a curved shaft can feel easier to control for some close lawn work. Neither shape is best for every yard.

Straight shafts often provide more reach between the operator and the cutting head. That can help when trimming beneath shrubs or reaching into wider areas.

Curved shafts can make the head feel closer to the operator. They may suit lighter detail work and smaller spaces.

Shaft shape is only one factor. Weight, handle position, balance, cutting width and head angle affect how tiring a tool feels.

If you regularly clear tall growth, see What Is the Best String Trimmer for Tall Weeds?. Tall weeds may also require a thicker line or a tool designed for heavier vegetation.

What line system should you choose?

Choose a line system based on how much interruption you can tolerate. Automatic feed is simple, bump feed gives manual control, and push-button feed lets you release line when you decide.

Automatic-feed systems release line as the spool turns or as the tool senses the need. This can reduce the need to stop, but the system may use line faster.

Bump-feed systems release line when you tap the head against the ground. They give the operator direct control, but bumping near hard surfaces can damage the spool or release too much line.

Push-button systems let you release line from a control on the tool. The WORX model uses a Command Feed push-button system.

Line diameter also matters. The WORX product uses 0.065 in line, while other models may support different sizes.

Always match replacement line to the tool's instructions.

Our best string trimmer line guide covers line choice by cutting task and tool requirements.

What features help with edging?

The most useful edging features are a rotating head, wheel guide, clear boundary guard and stable handle position. These features help keep the cutting line on the intended border.

A rotating head changes the angle without requiring you to hold the entire tool sideways. The BLACK+DECKER 20V MAX model rotates 180 degrees for edging.

Wheels can support the tool as you move along a sidewalk or driveway. The WORX model includes rubberized wheels for guiding the edger.

A spacer or flower guard creates distance between the line and nearby objects. This is useful beside flower beds, ornaments and young plants.

For a dedicated comparison of edging tools, read how to choose the best lawn edger tool. A dedicated edger may suit you better if crisp borders are your main goal.

How do you trim tall weeds and brush?

For tall weeds, use a trimmer with enough line size, motor power and cutting width for the growth. For woody brush, choose a tool designed for brush cutting instead of forcing a light grass trimmer.

Clear the area before starting. Stones, wire, sticks and other hard objects can become dangerous projectiles when struck by spinning line.

Keep the guard installed and wear eye protection, long pants and sturdy footwear. Follow the tool's safety instructions and keep people and pets away from the cutting area.

Work from the top of tall grass when practical, using controlled passes instead of pushing the head deep into a dense patch. Heavy growth can slow the motor and use line quickly.

A brush-cutting model may support a blade or heavier cutting attachment, but compatibility is specific to the tool. See our best weed eater for brush cutting guide before choosing an attachment or model.

Which featured products fit different yard needs?

The WORX model fits readers who want a cordless trimmer and edger in one unit. The BLACK+DECKER 20V MAX kit fits buyers who want cordless trimming plus a sweeper and a lighter 4.5 lb trimmer.

The BLACK+DECKER 14 in model fits buyers who prefer corded power and a wider cut path. Its 6.5 amp motor and 8,000 rpm speed are aimed at grass, weeds and overgrowth.

The Gas One GS-3400P Propane or Butane Stove is not a weed trimmer and should not be used for lawn work. It is a portable dual-fuel camping stove, not an outdoor cutting tool.

It has a gas power source, alloy steel and metal construction, a carrying case and a propane converter regulator. It accepts one 8 oz butane cartridge or a 16.4 oz propane cylinder, with fuel not included.

The stove has an adjustable heat dial, automatic piezo-electric ignition and safety systems for pressure and gas flow. Those features are useful for outdoor cooking, not trimming grass.

This item appears with the lawn-tool products only to make the category boundary clear. A product title must match the job you need to do.

What should you check before buying?

Check the power source, cutting width, line diameter, feed system, weight and edging function before comparing brand names. These details tell you more about daily use than a broad label such as “weed eater.”

Use this checklist:

1. Measure the area you need to trim.
2. Decide whether an outdoor outlet can reach the work area.
3. Choose cordless, corded or gas power.
4. Pick a cutting width that balances speed and control.
5. Check the tool's weight and handle adjustment.
6. Confirm whether it converts to an edger.
7. Check the included battery and charger details.
8. Match replacement line to the tool.
9. Confirm whether the model supports heavy weeds or brush.
10. Plan storage for batteries, fuel, line and safety gear.

A small yard with nearby outlets can work well with a corded model. A yard with several separated areas may be easier with cordless power.

For a battery platform you already own, check whether the trimmer uses the same system. The WORX model works within the WORX Power Share family, while the BLACK+DECKER kit uses 20V MAX lithium-ion batteries included with the kit.

Which accessories make a string trimmer easier to use?

Useful accessories include replacement line, spare spools, eye protection, work gloves, a shoulder strap when supported and a rack for transport or storage. Buy only attachments that match the tool.

Replacement line is the most common consumable. Keep the diameter and shape within the tool's approved range.

A spare spool can reduce downtime when the installed line runs out. Automatic-feed and push-button systems may still require correct spool replacement.

A shoulder strap can help with some heavier tools, but not every model supports one. Do not attach an aftermarket strap unless the tool instructions allow it.

A rack can keep a trimmer secure during transport. See best string trimmer trailer rack if you carry equipment to another property.

For repair and maintenance supplies, compare best string trimmer replacement parts. Choose parts by model number rather than appearance alone.

Should you buy a combo kit?

A combo kit can make sense when you need more than one cordless yard tool and want a shared battery system. It may be less useful if you already own compatible tools or only need trimming.

The BLACK+DECKER 20V MAX kit combines a string trimmer, edger and sweeper. It includes 2 batteries and a charger, so it covers trimming and hard-surface debris clearing in one purchase.

A combo kit can reduce the number of separate chargers and battery systems in your storage area. It can also add a tool you rarely use, so compare the included equipment with your actual yard routine.

If you want to compare kits by included tools, read best string trimmer combo kits.

How should you maintain a weed trimmer?

Basic maintenance includes cleaning grass from the guard, checking the line, inspecting the guard and storing the tool correctly. Battery, corded and gas models each have extra care needs.

Remove grass and debris from the cutting head after use. Build-up can affect line movement and make the head harder to inspect.

Check the spool and line before the next session. Replace damaged or incorrectly sized line rather than forcing it to work.

Inspect the guard, handle, wheels and cord or battery connection. Stop using the tool if a safety part is cracked or loose.

Store batteries according to their instructions and keep them away from extreme conditions. Keep fuel-powered equipment in an appropriate ventilated storage area.

A corded model needs careful cable inspection. Do not use a damaged cord, and keep the cable away from the cutting head.

Explore string trimmers & edgers by topic

• Best DeWalt String Trimmers
• Best EGO String Trimmers
• Best Straight Shaft Gas Trimmers
• Best Lightweight String Trimmers

What is the best weed trimmer for your yard?

The best weed trimmer depends on the work pattern, not one universal feature. Choose the WORX 20V model for cordless trimming and edging, the BLACK+DECKER 20V MAX kit for a lighter cordless tool with a sweeper, or the BLACK+DECKER 14 in model for corded power and wider coverage.

Choose cordless when movement and convenience matter most. Choose corded when your yard is small, an outlet is nearby and continuous power is more useful than cable-free movement.

Choose a wider head for faster open-border work, and a narrower head for control around plants and tight spaces. If your main need is brush, use a brush-capable model instead of a light grass trimmer.

Ignore products that do not match the task. The Gas One GS-3400P is a camping stove, so it belongs in outdoor cooking equipment, not a lawn-tool shortlist.

For current buying options, compare best weed eater on sale, then check the exact power source, included equipment and replacement-line requirements before ordering.

Frequently asked questions

What is a weed trimmer used for?

A weed trimmer cuts grass and weeds in places a mower cannot reach, such as along fences, flower beds, walls and tree trunks. It can also clean lawn edges when the tool has an edging mode or when the head can be turned for vertical cutting.

Is a weed eater a tool?

Yes. A weed eater is a handheld outdoor power tool that cuts grass and weeds with rotating nylon line, although some models accept blades for heavier growth.

Weed eater is a brand name that became a common term, while string trimmer and weed wacker describe the same general tool.

What is the best weed trimmer for a small yard?

The best weed trimmer for a small yard is usually a lightweight cordless or corded electric model with a manageable cutting width and simple line feeding. Choose cordless when you want freedom from an outlet, or corded electric when the yard is small enough for the cable to reach safely.

Can a string trimmer cut brush?

A string trimmer can cut light weeds and grass, but thick woody brush needs a model designed for brush cutting and the correct blade or heavy line. Clear stones and debris first, wear eye protection, and follow the tool's instructions before using any cutting attachment.