How to Smooth Vector Lines in Illustrator

To smooth vector lines in Illustrator, you reduce the number of anchor points on a path and make the remaining curves flow evenly. The main methods are the Smooth tool, which you brush along a selected path, and the Simplify command (Object > Path > Simplify), which reduces points across a whole selection at once. For logo work, finish with manual edits using the Direct Selection, Anchor Point, and Curvature tools. Automatic smoothing improves rough paths quickly, but logo-quality curves usually need hand refinement.

Key terms

• Path: any vector line or shape, made of segments connected by anchor points.
• Anchor point: a point on the path where a segment starts or ends.
• Direction handles (Bezier handles): lines extending from an anchor point that control the angle and depth of the curve passing through it.
• Smooth point: an anchor whose two handles sit on one straight line, so the curve passes through without a kink.
• Corner point: an anchor where the path changes direction abruptly, either by design or by mistake.
• Fidelity: the Smooth and Pencil tool setting that balances staying close to the original line against producing a smoother result.

Why lines from sketches end up jagged

Paths redrawn from hand-drawn sketches, whether traced automatically with Image Trace or drawn freehand with the Pencil or Brush tool, tend to carry too many anchor points. Each extra point is a place where the curve can wobble, bump, or pinch. Smoothing removes or repositions those points so each curve is described by as few anchors as possible. A logo built this way looks cleaner at every size, scales without visible lumps, and is easier to edit later.

Before you start

• Work on a copy. Duplicate the artboard or layer, or save a separate version, so you can compare the result against the original drawing.
• Keep the sketch visible. Place the scanned sketch on a locked layer with reduced opacity underneath your paths so you can judge whether smoothing has drifted from the intended shape.
• Know what you are smoothing. Note whether each line is a stroked path or a filled outline. A stroke is easier to smooth before you convert it with Object > Path > Outline Stroke, because afterward each edge becomes a separate path to fix.
• Separate type from artwork. Smoothing tools act on paths, not live text. If the logo includes a wordmark set in a font, keep it as live type on its own layer until the drawn elements are finished.
• Check your version. Menu names, dialogs, and default toolbar layouts have changed between Illustrator releases. The commands below are the standard locations, but confirm them in your installed version and in Adobe's current help for that release.

Method 1: The Smooth tool for local fixes

Use the Smooth tool when only parts of a path are rough, such as a wobbly stretch in an otherwise good curve.

• 1. Find the Smooth tool. It is grouped with the Pencil tool. If it is not in your toolbar, switch to the full toolbar with Window > Toolbars > Advanced, or add it through the Edit Toolbar option at the bottom of the toolbar.
• 2. Double-click the Smooth tool icon to open its options and set the Fidelity slider. Settings toward Accurate change the path less. Settings toward Smooth remove more points and change the shape more.
• 3. Select the path with the Selection or Direct Selection tool. The Smooth tool only affects selected paths.
• 4. Drag the Smooth tool along the rough section, following the line. Repeat passes over areas that still look uneven.
• 5. Check the result: the path should show fewer anchor points in that area, and the curve should no longer show bumps against the sketch underneath.

Repeated passes keep simplifying the path, so watch for curves flattening or corners rounding off. If a deliberate sharp corner softens, undo and work on each side of the corner separately.

Method 2: The Simplify command for whole paths

Use Simplify when an entire traced or freehand path carries far too many points. This is common after Image Trace.

• 1. Select the path or paths you want to clean up.
• 2. Choose Object > Path > Simplify. In recent versions, a compact slider appears near the selection and Illustrator applies an automatic reduction. Earlier versions open a dialog directly.
• 3. Drag the slider to reduce points. Moving it toward fewer points smooths the path more but can distort it.
• 4. For finer control, open the full options (the More Options button in recent versions). Here you can set a corner angle threshold that preserves sharp corners, and turn on a preview of the original path for comparison. An option to convert curves to straight lines also exists, but leave it off unless the design is purely geometric.
• 5. Confirm, then compare the simplified path with the sketch underneath and with the original path.

Simplify treats every part of the selection with the same setting. If one area needs heavy smoothing and another needs to keep detail, select and simplify them separately, or simplify lightly and finish by hand.

Method 3: Adjust Image Trace settings before expanding

If the jagged lines come from Image Trace, you can often prevent much of the roughness at the source. With the traced object selected, open the Image Trace panel (Window > Image Trace) and expand the Advanced section. Lowering the Paths setting produces looser paths with fewer points. Adjusting Corners changes how readily the trace creates sharp corners. Raising Noise ignores small specks and edge irregularities from the scan. Preview the changes, then click Expand to convert the trace into editable paths and smooth whatever roughness remains with the methods above. A clean, high-contrast scan of the sketch also reduces jaggedness before tracing begins.

Method 4: Manual anchor editing for logo-quality curves

Automatic smoothing seldom produces the even, controlled curves a finished logo needs. Manual refinement is the step that makes a traced sketch look deliberately drawn.

• Remove unnecessary points. Use the Delete Anchor Point tool (grouped with the Pen tool) to click away points that do not define a change in the curve. Removing a point with this tool keeps the path closed.
• Convert accidental corners. Use the Anchor Point tool (Shift+C) and drag from a kinked corner point to pull out handles and make it a smooth point. You can also select points with the Direct Selection tool and use the convert-to-smooth button in the Control or Properties panel.
• Place points at the extremes of curves. As a construction principle, put anchors where a curve reaches its furthest top, bottom, left, or right position, and keep their handles horizontal or vertical. Hold Shift while dragging a handle to constrain its angle. This produces predictable, even curves.
• Balance handle lengths. Very uneven handles on neighboring points can cause flat spots or bulges. Adjust them with the Direct Selection tool until the curve's tension looks even along its length.
• Redraw where needed. When a section is beyond repair, redraw it with the Curvature tool or the Pen tool, using the sketch as a guide, and join it to the rest of the path with Object > Path > Join.

Choosing a method

Situation | Recommended approach

A few rough areas on an otherwise good path | Smooth tool with low-to-moderate Fidelity

Traced or freehand path with excessive points throughout | Simplify, preserving corners, then manual refinement

Trace not yet expanded | Adjust Image Trace Paths, Corners and Noise first

Final logo curves that must look precise | Manual anchor and handle editing, or a Pen/Curvature redraw

Purely geometric mark | Rebuild with shapes and the Pen tool rather than smoothing a trace

How to confirm the lines are smooth

• Outline view: choose View > Outline (Ctrl+Y on Windows, Cmd+Y on macOS) to see bare paths without fills or stroke weights. Wobbles and stray points that a thick fill hides become visible.
• Anchor inspection: select paths with the Direct Selection tool and look for clusters of points, overlapping points, and handles that are not aligned on smooth curves.
• Zoom extremes: inspect at high magnification for bumps, then zoom far out and view the logo at a small size to judge overall flow and balance.
• Sketch comparison: toggle the sketch layer to confirm smoothing has not changed the intended proportions or character of the drawing.
• Stray-point cleanup: choose Object > Path > Clean Up to remove isolated anchor points and empty paths left behind by editing.

Preparing the smoothed logo for use

Once the curves are final, decide whether strokes should stay live or be converted with Outline Stroke. Converting keeps line weights fixed when the logo is scaled by someone else. Live strokes are easier to adjust later, so keep an editable master file with live strokes and live type, and produce a separate delivery version with outlined strokes. If the wordmark needs to work without the font installed, outline the type in that version only (Type > Create Outlines). Overlapping shapes can be merged with the Unite option in the Pathfinder panel so the delivered artwork has clean, single outlines. Then save or export in the format the recipient needs. Keep in mind that a file extension alone does not prove the file contains only clean vector paths, and it says nothing about permission to reuse the logo.

Gaps in this guide

This guide was not based on a specific Illustrator version. Tool groupings, the Simplify interface, and option names can differ in your release, so verify them against your installed version and Adobe's documentation for it. No recommended numeric values are given for Fidelity, Simplify, or Image Trace settings, because the right values depend on the sketch, the scan quality, and the level of detail in the design. Judge the results visually, using the checks above.