Two ways to store images
Every digital image is stored as either a raster image or a vector image. This difference is fundamental and determines what you can do with an image. For logos and professional brand identity, it is crucial to understand this difference, as it determines the quality and usability of your logo.
Vector versus raster: the fundamentals
Raster images
A raster image (also called a bitmap) consists of a grid of pixels: small squares that each contain one colour. The quality is fixed when the file is created. When enlarged, the pixels become visible as blocks, making the image blurry and grainy. Common raster formats include JPG, PNG, GIF and BMP.
Vector images
A vector image consists of mathematical descriptions of shapes, lines and colours. There are no pixels, only paths that are calculated and drawn by the computer. This makes a vector image infinitely scalable: from postage stamp to billboard, always sharp. Common vector formats include AI, SVG, EPS and PDF.
Technical difference explained
The difference lies in how the image data is stored. A raster file contains a list of pixels with their colour values. An image of 1000 x 1000 pixels contains one million colour values. Want the image twice as large? Then pixels must be invented (interpolation), which always leads to quality loss. A vector file contains instructions such as 'draw a circle with centre (100,100) and radius 50, colour blue'. Whether the circle is displayed on a phone screen or a building does not matter: the computer calculates the perfect rendering each time.
When to use which?
Logos and brand identity
Always vector. Your logo is used in dozens of sizes and on dozens of materials, from business cards to building facades. A vector file guarantees that it always looks perfect, regardless of size.
Photos and images
Always raster. Photos contain millions of subtle colour nuances that are best captured in a pixel grid. Vector format is not suitable for this purpose.
Print and signage
Vector for logos and text, raster for photos. Printers and sign makers require vector files for sharp lines and text, while photos are supplied as high-resolution raster files.
Websites and apps
Vector (SVG) for logos and icons, raster (JPG/PNG/WebP) for photos. This combination ensures sharp logos that scale on every device, and optimized photos that load quickly.
Frequently asked questions
How do I know if my logo is a vector or raster file?
Check the file extension. AI, SVG, EPS and PDF are usually vector formats. JPG, PNG, GIF and BMP are always raster formats. Note: a PDF can also contain an embedded raster image. If in doubt, open the file in Illustrator and zoom in; if it stays sharp, it is a vector.
Can I convert a raster image to vector?
Yes, this process is called vectorization. It can be done automatically (with varying results) or manually (for professional quality). Logo in Vector specializes in this and always delivers a perfect vector result.
Why does my printer ask for a vector file?
Printers, sign makers and manufacturers need vector files for sharp output at any scale. A raster file that looks good on your screen can become blurry or grainy when printed in large format. A vector file prevents this problem entirely.
Ensure your logo is always available as a vector
The difference between vector and raster is fundamental to the professional use of your logo. A vector file is the foundation of your visual identity and indispensable for print, signage and websites. Only have a raster version of your logo? Logo in Vector turns it into a professional vector file, so you are always prepared.