Is this really a vector file, or does it just look like one?

Vector or bitmap, and why the difference decides how a logo prints

Vector artwork is stored as drawing instructions: lines, curves and fills that a printer can render at any size. A bitmap is stored as a grid of pixels, so enlarging it past its natural size softens every edge. Most print jobs that go wrong go wrong here, because the file extension does not tell you which of the two you have.

How can I tell if my logo is a vector file?

Enlarge it. Genuine vector artwork stays sharp at any magnification, while a bitmap breaks into pixels. That is the test this tool automates: it reads the file, measures how much of the visible artwork is made of drawing instructions rather than placed images, and gives you a magnifier so you can confirm the answer yourself rather than take its word for it.

Is a PDF a vector file?

Sometimes. A PDF is a container, not a guarantee. It can hold drawn artwork, a scanned photograph, or both at once. A PDF holding a single placed JPEG is a bitmap in a vector wrapper, and it will print exactly as badly as the JPEG would. An SVG that wraps a base64 PNG is the same trick in a different format.

Which file formats are vector, and which are bitmap?

SVG, AI, EPS and PDF can hold vector artwork, though none of them promises it. PNG, JPEG, GIF, WebP, TIFF and BMP are always bitmaps. Renaming a JPEG to .eps or .svg converts nothing, and this tool reports that mismatch as a finding rather than trusting the extension.

Can a PNG or JPEG be converted to vector?

Not by renaming or re-saving it. The pixels carry no record of the curves that made them. Auto-tracing can approximate simple shapes, and it usually shows on lettering and fine detail. For a logo that has to print well, the reliable routes are redrawing it or asking whoever made it for the original artwork.

Why does my logo look blurry or pixelated when printed?

Because it was a bitmap enlarged past the size its pixels support. An image 500 pixels wide printed 100 mm across works out at about 127 dpi, well under the 300 dpi that commercial printing generally expects. This tool reports the effective dpi of every placed image, and the largest size a bitmap can print at 300 dpi.

What is the difference between AI, EPS and SVG?

AI is Illustrator's own format, and modern versions are PDF underneath. EPS is PostScript, an older interchange format still common in print. SVG is the web's vector format and is plain XML. All three can hold real vector artwork, and all three can hold nothing but a placed bitmap.

Does this upload my files anywhere?

No. There is no server to upload them to. Every check runs in your browser and the file never leaves your machine. You do not have to take that on trust: open your browser's developer tools, watch the network panel, and drop a file in. Nothing is sent, because the page makes no external request at all.

Free to use, with no account and no upload.