Vector files are made of math. Raster files are made of pixels. That single difference decides whether your logo prints sharp or fuzzy, whether it can scale to a billboard or only fits on a business card, and whether your print shop calls you back asking for a "better file."
Once you understand it, you'll never confuse the two again — and you'll know exactly what to send when you're getting custom apparel made.
If you remember nothing else.
Vector = bulletproof. Files like .ai, .eps, and .svg can be resized to any dimension without losing quality. Send these to print shops whenever possible. Raster = risky. Files like .jpg, .png, and .gif have a fixed resolution. They look fine at their original size but become pixelated when enlarged. Use raster only when you have no vector option.
What vector files actually are
A vector file doesn't store a picture in the traditional sense. It stores mathematical instructions: "draw a circle with this radius at this location, fill it with this color, then place a letter 'B' next to it in this font at this size."
When you open a vector file, your computer reads those instructions and renders the image fresh. When you scale it bigger, the computer just recalculates with bigger numbers. The image stays perfectly sharp at any size — from a postage stamp to a billboard — because it's not pixels being stretched, it's math being recomputed.
This is why graphic designers create logos in vector format. A logo needs to look good on a business card (small) and on a building sign (huge), and a single vector file handles both without losing any sharpness.
What raster files actually are
A raster file is a grid of colored squares called pixels. Your computer screen is a giant raster grid. A 1000x1000 pixel image is literally one million tiny squares, each assigned a color value, arranged in a grid.
This works beautifully when displayed at the size the file was designed for. Where it breaks down is scaling. Make a 100x100 pixel image into a 500x500 image, and your computer has to invent 240,000 new pixels to fill the gap. It does its best, but the result is the blurry, jagged look we call "pixelated." There's no math to recompute, just empty space being filled with educated guesses.
Vector Files
- Scale infinitely with no quality loss
- Print razor-sharp at any size
- Easy to edit colors and shapes
- Smaller file sizes for simple designs
- Required for some printing methods (cut vinyl)
- Best for logos, type, simple graphics
Raster Files
- Fixed resolution — quality drops when enlarged
- Print well only at or below original size
- Required for photographs and detailed gradients
- Larger file sizes for high-quality images
- Easy to edit photos but hard to edit shapes
- Best for photos, complex artwork, gradients
How to identify which one you have
The easiest way is to check the file extension — the letters after the dot at the end of the filename.
Vector Formats
Raster Formats
The PDF complication: A PDF can contain either vector or raster content. PDFs exported from Adobe Illustrator are vector. PDFs created from a scanned image or saved from a Word document with a JPG inside are raster. If you're unsure, open the PDF and zoom in dramatically. If the image stays sharp, it's vector. If it becomes pixelated, it's raster.
The visual test
If you can't tell from the filename, here's the foolproof test: open the file and zoom in.
Vector files stay perfectly sharp no matter how far you zoom. Edges remain crisp, curves remain smooth, text stays readable. Zoom to 1000% and it looks identical to 100%, just bigger.
Raster files reveal their pixels when you zoom. Edges become jagged "stair-steps." Curves develop a chunky pixelated appearance. Eventually you can see individual colored squares making up the image. The more you zoom, the worse it looks.
"If your logo looks great on your screen but the print shop keeps asking for a 'better file,' you almost certainly have a low-resolution raster image. The shop isn't being picky — they're trying to save you from paying for a fuzzy print."
What to do if you only have raster
Sometimes you don't have access to the original vector file. Maybe the designer is long gone, or you got the logo from a website. You have three options:
Option 1: Send the highest-resolution raster you have. If your raster is at least 300 DPI at the size you want it printed, it'll print acceptably well. A 6-inch logo at 300 DPI is 1800 pixels wide. Anything below that will likely print fuzzy.
Option 2: Pay for vectorization. Most print shops offer this service for $25 to $75 depending on complexity. A designer manually traces your logo in Illustrator to recreate it as vector art. This is the right move for any logo you'll use repeatedly — it's a one-time cost that saves you from artwork problems forever.
Option 3: Use it as-is and accept the limits. If you're getting a tiny logo printed once at a small size, raster might be fine. If your raster is genuinely high resolution and you're not enlarging it, the result will be acceptable. The print won't be as crisp as vector, but it'll work.
The Badger take
Send vector when you can. Send the highest-resolution raster you have when you can't. If you have something messy and aren't sure what's printable, just send it our way — we'll review your file, tell you honestly what we can do with it, and recommend whether vectorization is worth it for your specific job.
Most artwork problems are fixable. The ones that aren't usually become apparent before the press starts running, not after. Better to know up front than to be disappointed when the shirts arrive.
Common questions
What is the difference between vector and raster files?
Vector files are made of mathematical paths and shapes that can scale infinitely without losing quality. Raster files are made of pixels arranged in a grid — they have a fixed resolution and become blurry when enlarged. For custom apparel, vector files produce sharp prints at any size, while raster files only print well at or below their original resolution.
How do I know if my file is vector or raster?
Check the file extension. Vector formats include .ai, .eps, .svg, and most .pdf files. Raster formats include .jpg, .png, .gif, and .psd. You can also test by zooming in dramatically — vector art stays sharp at any zoom level, raster art becomes pixelated.
Can a raster file be converted to vector?
Yes, but it requires manual work by a designer or a vectorization service. Automatic conversion tools rarely produce print-ready results. Most print shops can vectorize simple logos for a small fee, typically $25 to $75. For complex or photographic images, vectorization may not be possible without redrawing the artwork from scratch.
What's the best file format to send a print shop?
Vector formats are always preferred — .ai, .eps, or vector .pdf. If you only have raster, send the highest-resolution version available, ideally 300 DPI at the actual print size. A 2-inch logo at 300 DPI is 600 pixels wide. Anything smaller will likely print fuzzy.
Why does my logo look great on screen but bad when printed?
Screens display at 72 to 96 DPI, so a low-resolution image looks fine on a monitor. Printing requires 300 DPI for sharp results. A file that looks crisp at small size on screen often becomes blurry when scaled up for printing on a shirt. This is the most common artwork problem print shops see.
