Where EPS files are requested
Rubber stamp and seal makers, embroidery digitisers, screen printers, sign shops and some publishers still ask for logos and graphics as EPS. If your logo or graphic exists only as a PNG, converting it gives them the file type they ask for.
What happens when you convert
Each PNG is opened in your browser, placed on a white background, and stored inside an EPS file as a high-quality JPEG image at its full pixel size. Each PNG becomes its own EPS file, ready to place in print and layout software.
What changes from the PNG
Transparency is not kept: transparent areas become white, because this EPS stores a flat image. The graphic is also not converted into vector paths, so it cannot be scaled up endlessly or edited shape by shape. For logos that must scale to any size or be cut by machines, trace the PNG into vectors with Image to SVG.
Common problems and how to fix them
A white box appears behind the logo: transparency was lost — ask whether the printer accepts PNG or SVG instead. Edges look soft on large prints: start from a larger PNG, at least 2000 pixels wide. The design software cannot edit the logo: it is a picture inside the EPS; use a vector version.
Good habits
Keep your original PNG, ask the printer whether vector artwork is needed, and check the EPS in a viewer or the printer's proof before production.