Use SVG for shapes that need to scale
A logo on a website header may be only a few dozen pixels tall, while the same logo on a printed display might be several feet wide. SVG describes artwork as coordinates, curves, fills and strokes. A vector logo can be drawn at both sizes from the same source, and a designer can change the shape or color of an individual path.
Check the actual contents of an SVG before treating it as an editable master. The format can hold photographs and other embedded raster images. Open the file in SVG Viewer to check the visible artwork, then select a shape in a vector editor if you need to confirm that its outline is editable.
Use PNG when you need exact pixel dimensions
PNG stores a grid of pixels and can preserve transparency. It is a good choice for screenshots, product images, presentation graphics and systems that expect a fixed image size. A transparent PNG fits over a colored slide or a product listing background without a white rectangle around the subject.
If a platform asks for a 1,200-pixel-wide logo, keep the SVG master and export a copy with SVG to PNG. Set the requested width, preserve the proportions and check the image against its intended background. Export again from the master when you need a different size.
Trace a raster copy when the vector original is missing
A small PNG from an old email signature might be the only available copy of a logo. Image to Vector can trace the visible shapes into editable paths. Use the clearest copy available and remove unrelated backgrounds or margins first. A flat logo with distinct color areas gives the tracer more reliable boundaries than a screenshot with compression artifacts.
Tracing is an interpretation. Compare the result with the original at normal size and at high zoom. Look closely at letter openings, small dots, thin strokes and pointed corners. If a curve has become lumpy or a letter has lost a piece, correct that part in a vector editor before treating the trace as the new master.
Keep the master and the delivery file separate
For a website, SVG is often the useful master for logos and icons, while PNG is convenient for systems that specify pixel dimensions. For a printer or fabricator, ask which format they need and whether text must be outlined. A production PDF, a cutting outline and a PNG preview can all come from the same artwork, and each serves a different purpose.