# What Is a Vector File? The Formats, and How to Tell If Your Logo Really Is One > A vector file describes artwork as shapes instead of pixels, so it stays sharp at any size and every part can be edited. Here is which formats are vector, why a file extension can’t prove it, and how to test your own logo in two minutes. Published 6 October 2026 by VKTR · 10 min read · https://www.vktrstudio.com/insights/what-is-a-vector-file ## Key takeaways - A vector file stores artwork as paths: points joined by straight lines and curves, with fills and strokes. The shapes are redrawn at any size, so a vector logo stays sharp from a business card to a billboard. - SVG, EPS, AI, PDF and DXF are vector formats, but SVG, EPS, AI and PDF can also carry pixel images, so the extension alone doesn’t prove a logo is vector. PNG, JPG, WebP, HEIC and GIF are always raster. - To check, open the file in a vector editor and switch to an outline view: real vector artwork shows its paths, while a pasted-in picture shows as a box. - If all you have is a PNG or JPG, the logo has to be traced or redrawn. [VKTR Studio](https://www.vktrstudio.com/studio) traces it into paths in your browser and never embeds a picture in the files it gives you. **A vector file is an image file that stores artwork as mathematical shapes: points joined by straight lines and curves, filled or outlined with colour.** Software redraws those shapes at whatever size you ask for, so a vector logo stays perfectly sharp on a business card, a shop sign or a building wrap. A raster file stores a fixed grid of coloured pixels instead. PNG, JPG, WebP and HEIC images are raster, which is why a logo saved from a website goes blocky when you enlarge it for print. ## What is a vector file, in simple terms? Think of a recipe and a photo of the finished cake. A raster image is the photo: a record of what every tiny square looked like. A vector file is the recipe: draw a curve from here to there, close the shape, fill it with this red. Give the recipe to a printer, a cutting machine or a screen at any size, and it makes the shape fresh. Every vector file is built from the same parts: - **Anchor points:** the fixed positions a shape passes through. - **Paths:** the straight lines and bezier curves that join those points. - **Fills and strokes:** the colour inside a closed shape and along its edge. - **Groups and layers:** the structure that keeps related shapes together, such as a logo’s icon and its wordmark. Because each shape is its own object, you can select one part, change its colour, move it or resize it without touching the rest. That is why printers, sign makers and cutting machines ask for vector files. ## Vector vs raster: the difference at a glance **Raster and vector files compared** | Feature | Raster file | Vector file | | --- | --- | --- | | Made of | A grid of coloured pixels | Points, paths and fills | | Enlarging | Turns blurry or blocky past its pixel size | Stays sharp at any size | | Editing | Changes pixels, area by area | Changes shapes, object by object | | Best for | Photos and painted, textured images | Logos, icons, lettering, line art and illustrations | | Common formats | PNG, JPG, WebP, HEIC, GIF, TIFF | SVG, EPS, AI, PDF, DXF | | File size | Grows with the pixel dimensions | Grows with the number of shapes | Neither is better in general. A photograph belongs in a raster file. A logo belongs in a vector file, because it has to work at every size and in every colour version. ## Which file formats are vector? Some formats are always raster. Others are vector formats that are allowed to carry pixel images as well, which is where most of the confusion comes from. **Is it a vector file? Common formats checked** | Format | Vector? | What to know | | --- | --- | --- | | SVG (.svg) | Usually | An XML vector format for the web and cutting machines. It can also hold embedded or linked pixel images. | | EPS (.eps) | Often | A PostScript format for print that can mix vector and pixel data. An EPS saved from Photoshop is usually a pixel image. | | AI (.ai) | Usually | Adobe Illustrator’s own format. Photos and pasted logos placed in it stay pixels. | | PDF (.pdf) | Sometimes | A page format that can hold vector shapes, text and pixel images side by side. | | DXF (.dxf) | Yes | A CAD exchange format of lines and curves, read by laser, plasma and CNC software. | | CDR (.cdr) | Usually | CorelDRAW’s own format: vector-based, and like AI it can contain bitmaps. | | EMF and WMF | Sometimes | Windows metafiles that can hold vector drawing commands and bitmaps. | | PSD (.psd) | Mostly no | A Photoshop document is pixel-based, though it can contain vector shape and text layers. | | PNG, JPG, WebP, HEIC, GIF, TIFF | No | Always raster. A logo saved in one of these is a picture of the logo. | **So the honest answer to “is SVG a vector file?” or “is PDF a vector file?” is: the format supports vectors, but the file in front of you might not contain any.** A logo saved from a website, a screenshot or an AI image generator can be wrapped in an SVG or a PDF and still be pixels inside. The Library of Congress format description for SVG lists three kinds of content an SVG can hold: vector shapes, raster images and text. ## What is a vector file saved as? Vector files are saved as .svg, .eps, .ai, .pdf, .dxf and .cdr, plus .svgz for a compressed SVG and .emf or .wmf for Windows metafiles. For a logo, five of them cover almost every request: - **SVG** for websites, apps and cutting machines such as Cricut. - **PDF** for most printers, because it opens everywhere and keeps the paths. - **EPS** when a sign maker or an older print workflow asks for it. - **AI** as the editable master, if your designer works in Illustrator. - **DXF** for laser cutting, engraving and CNC routing. Our [image to EPS converter](https://www.vktrstudio.com/image-to-eps) and [image to DXF converter](https://www.vktrstudio.com/image-to-dxf) pages explain when each of those two formats is the right one. ## How to tell if a file is really vector The extension is the first check, not the last. These five settle it, quickest first: ### 1. Zoom in far Open the file and zoom to 800% or more. Raster edges turn into a staircase of squares; vector edges stay smooth because they are redrawn at every zoom. Treat this as a hint only: a very large raster image can still look sharp at a moderate zoom. ### 2. Switch to an outline view Open the file in a vector editor such as Adobe Illustrator or Inkscape and switch to an outline view (in Illustrator, View > Outline). Vector artwork turns into thin outlines of its paths. A placed picture does not: Adobe describes linked images in Outline mode as boxes with an X inside. Inkscape has an outline display mode too. ### 3. Try to select one part Use the direct-selection or node tool and click the edge of a letter. If you can see and drag anchor points, that part is vector. If nothing inside the logo can be picked however deep you click, you are probably looking at an embedded picture. A whole logo selecting together on the first click proves nothing: groups do that too. ### 4. For an SVG, look inside the file An SVG is plain text. Open it in a text editor and search for “