What EPS Actually Is
An EPS file is a self-contained PostScript program that describes a single page or graphic. It can contain vector objects (paths, text), raster images, or a combination. When opened in a capable application, the PostScript interpreter renders the content at any resolution without pixelation- But only if the content is truly vector.
Is the EPS File Truly Vector?
No. Converting a JPG to EPS embeds the raster JPEG data inside a PostScript wrapper. The file is valid EPS and will open in EPS-compatible applications, but it remains a raster image at its original pixel resolution. Scaling it up in print will produce the same pixelation as the source JPG. True vector artwork must originate from a vector editor such as Illustrator or Inkscape.
When Printers Require EPS
Some older print workflows and RIPs (Raster Image Processors) accept only EPS files, even for raster content. Providing a JPG-sourced EPS satisfies this requirement while retaining all the original pixel data. Ask your print provider what resolution (DPI) they need- Ensure your source JPG already has sufficient resolution before converting.
EPS vs PDF for Print
PDF has largely replaced EPS in modern print workflows because PDF supports the same PostScript drawing model while being easier to preview and adding features like encryption, bookmarks, and standardised colour management (PDF/X). If your printer accepts PDF, it is generally the better choice.