Vector image: what it is, formats, and when to use it

A vector image is built from mathematical lines, curves, and shapes, not from pixels. This means it can be scaled to any size—from a 16-pixel favicon to a 10-meter billboard—without losing quality. That's why it's the preferred format for logos, icons, illustrations, and any graphic that needs to stay sharp at multiple sizes.

The distinction between vector and raster is one of the most basic decisions in brand asset management and, paradoxically, one of the most neglected. A brand with its logos only in JPG is a brand that will sooner or later publish a blurry logo.

Vector vs raster: the difference that matters

Characteristic	Vector	Raster
Composition	Mathematical formulas	Pixels
Scalability	Infinite, no loss	Loses quality when enlarged
File size	Generally lightweight	Heavier at high resolution
Editing	Each element is independent	Pixels can't be edited individually
Suitable for photography	No	Yes
Suitable for logos / icons	Yes (the best option)	No (limited)

The practical rule:

• Photography → raster (JPG, PNG, WebP, AVIF).
• Logo, icon, illustration, infographic → vector (SVG, AI, EPS, PDF).

Mixing them (logos in JPG, photography in SVG) is the source of most asset problems.

Common vector formats

SVG (Scalable Vector Graphics)

Open standard for the web. Editable with code or design tools. Very lightweight. Supports animation. The preferred format for the web and modern applications.

AI (Adobe Illustrator)

Illustrator's native format. Editable with all layers and elements. Essential as the master file so the design team can iterate.

EPS (Encapsulated PostScript)

A veteran format, widely compatible with professional printing software. In decline against PDF and SVG, but still requested in some editorial or industrial contexts.

PDF

Multipurpose. It can contain both vector and raster. Useful for delivering assets to third parties who don't necessarily have design software.

When to use vector

• Logos (always, without exception).
• Interface icons.
• Signage and wayfinding.
• Packaging (printing at different sizes).
• Brand illustrations.
• Motion graphics (After Effects files usually use vectors).
• Large-format printing (billboards, displays, events).
• Editable documents that are updated periodically.

The most expensive mistake: logos only in raster

Typical symptoms:

• Pixelated logos in large presentations.
• Different versions scattered across different folders, none of them editable.
• External designers asking for "the logo in vector format" every three months.
• Re-editing assets from scratch because no one has the editable original.

The solution isn't complicated: the master file for any logo should live in an editable vector format (ideally AI + SVG + PDF), with derivative versions for each use (optimized raster for the web, raster for social, etc.).

Best practices for managing vector assets

• Always keep the editable master file. If you only have the export, you don't have the asset.
• Versions by context: a light version for dark backgrounds, a dark version for light backgrounds, monochrome for when color isn't an option.
• Tag with version, color, use, and approval status.
• Don't edit the original. Work on copies and keep the master intact.
• Document colors in code (HEX, RGB, CMYK, Pantone) so the vector can be reproduced in any medium.
• Audit the library every 6 months: deleting obsolete versions avoids future confusion.

Checklist before approving a vector asset

• Is there an SVG and PDF version, not just PNG?
• Is there a light and dark version?
• Are the colors documented (HEX, CMYK, Pantone)?
• Has scaling from 16 px to 1,000 px been tested?
• Is the master AI/SVG file in the library, not just on the designer's computer?
• Is it officially approved by brand?

If the answer to any of these is no, you have a vulnerable asset that will create friction sooner or later.

In creative operations

For a brand that produces a lot of content, the discipline of vector asset management is what separates a professional operation from a chaotic one. When logos live in six Drive folders with no clarity about which is the official one, any external designer or new team member recreates them blindly, generating inconsistencies.

A centralized library with approved vectors, search by name, and permissions by brand solves this at the root. For more on how to manage visual coherence at scale, read brand management.

At Polimake, the master vector files live in Media with tags, versions, and approval status. Studio works with templates that include the correct vectors by default, and Studio manages the brand update calendar.

Related concepts

• Bitmap / raster
• Brand guidelines
• Mockup
• Corporate design
• Brand management

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This piece is part of the Polimake glossary and of the cluster on creative operations. If you manage brand assets at an agency or in-house team, also read brand management.