How to Resize a Vector in Illustrator Without Changing the Stroke

The short answer

Turn off the Scale Strokes & Effects option before you resize. When this option is off, Illustrator changes the size of the path but leaves the stroke weight at its original value. When it is on, the stroke weight changes in proportion to the object. The option is in three places: the General section of Illustrator's preferences, the Transform panel menu, and the Scale dialog. The steps below show how to change it and how to check the result.

A stroke is the line Illustrator draws along a path. Its thickness, called the stroke weight, is usually measured in points. A fill is the color inside a closed shape. Scaling always changes the geometry of the path. The Scale Strokes & Effects option only decides whether the stroke weight and any live effects, such as drop shadows, are resized along with that geometry. Fills always scale with the shape because they have no separate weight.

Decide whether the stroke should stay fixed

For most logos you want the stroke to scale. A logo's identity depends on how thick its lines are compared with its shapes. If you enlarge a mark and keep the stroke fixed, the lines look thinner. If you reduce it, the lines look heavier. Either way the logo no longer matches the approved design. A fixed stroke is the right choice only when line weight must stay constant on purpose, which is a design decision rather than a technical requirement.

Situation | Scale Strokes & Effects | Why

Resizing a finished logo for delivery | On | Keeps the mark's line-to-shape proportions intact

Building a set of line icons that share one stroke weight at different sizes | Off | Line weight is meant to stay consistent across sizes

Cleaning up a redrawn sketch at working size before the weight is final | Off | Lets you adjust the path size without disturbing the stroke weight you are testing

Creating a deliberate small-size version of a logo with adjusted weights | Off, then set weights by hand | Small-size versions are drawn on purpose, not produced by scaling alone

Before you start

• Confirm the artwork is actually made of editable vector paths. A file extension such as AI, EPS, PDF or SVG does not prove this, because these formats can contain embedded raster images. It also does not mean you have permission to modify or reuse the logo.
• Open the Stroke panel (Window > Stroke) and note the current stroke weight of the paths you plan to resize so you can compare after scaling.
• Check whether the artwork uses live strokes, outlined strokes, or both. Strokes that have already been converted to filled shapes, for example with Outline Stroke, will always scale with the object no matter how the option is set.
• If the artwork contains live type, note the font and point size. Scaling a type object changes its size, and any stroke applied to the type follows the same Scale Strokes & Effects setting.

Steps: resize while keeping the stroke weight

• 1. Turn off Scale Strokes & Effects using whichever method is most convenient. In preferences: on Windows go to Edit > Preferences > General, and on macOS go to Illustrator > Settings > General in recent versions (older versions label it Preferences). Uncheck Scale Strokes & Effects. In the Transform panel (Window > Transform): open the panel menu and uncheck Scale Strokes & Effects. Recent versions also show this checkbox at the bottom of the panel when options are displayed.
• 2. Decide on Scale Corners. This related option controls whether rounded live corners keep their radius or scale with the object. Turn it off if corner radii must also stay fixed.
• 3. Select the artwork with the Selection tool.
• 4. Resize it with one of these methods. Drag a bounding-box handle while holding Shift to keep proportions. Or type a new width or height in the Transform panel or the Properties panel, with the constrain-proportions link turned on. Or, for an exact percentage, choose Object > Transform > Scale, enter a value, and confirm that Scale Strokes & Effects is unchecked in that dialog before clicking OK.
• 5. If you are resizing several separate objects, check whether you want them scaled as one group or each around its own center. Object > Transform > Transform Each scales each object individually.

In current versions these checkboxes generally reflect one shared preference. Changing the option in one place usually changes it everywhere, and the setting stays in effect after you close the dialog. Because menu names and panel layouts can differ between Illustrator releases, check the exact labels against the version you are using.

How to confirm the result

• Select a resized path and open the Stroke panel. The weight should match the value you recorded before scaling. If it shows a different number, the option was on during the transform. Undo, turn the option off, and scale again.
• Check dashed strokes and arrowheads. Dash and gap lengths and arrowhead scale are set in the Stroke panel, so confirm they still look as intended at the new size.
• If the artwork uses brushes or variable-width profiles, inspect them visually as well as numerically, because their appearance depends on more than a single weight value.
• View the artwork at 100% and at the size it will actually be used, and compare it with the original. For a logo, look for lines that now seem too thin or too heavy relative to the shapes.
• When you are finished, return Scale Strokes & Effects to the setting you normally use, so later scaling does not produce unexpected results.

Applying this to logos redrawn from sketches

When you redraw a hand-drawn sketch as vector paths, it is common to build the lines with live strokes and adjust their weight while refining the curves. Keeping Scale Strokes & Effects off during this stage lets you resize the path skeleton to match the sketch without losing the line weight you are evaluating. Image Trace output is different: it usually produces filled shapes rather than stroked paths, so the stroke setting will not affect it unless you have added strokes yourself. Check the Appearance panel to see which kind of artwork you have.

Once the weights are approved, consider converting the strokes to filled shapes for the delivered master files. To do this, select the paths and choose Object > Path > Outline Stroke, and keep an unoutlined working copy for future edits. Outlined artwork scales the same way in any application. Live strokes in exported files, by contrast, usually scale with the whole image when someone resizes the placed graphic in a layout program or an SVG on a web page, so their behavior is outside your control. If the logo contains live type, convert it with Type > Create Outlines in the delivery copy. This keeps recipients from needing the font, but it also means the text can no longer be edited.

Gaps to check

No version-specific documentation was provided for this guide. The menu paths and panel locations above describe the commonly documented behavior of recent Illustrator releases. Confirm them in your installed version, especially the Preferences versus Settings label on macOS and where the Transform panel checkboxes appear. This guide also does not give recommended stroke weights or minimum logo sizes, because those depend on the specific artwork and its use and were not part of the supplied material.