Resize a PNG Image

Resizing a PNG safely keeps its useful properties

A PNG is lossless, so a reduction keeps every remaining pixel exactly, which means a logo, a diagram, and a screenshot all stay crisp rather than picking up the ringing and softening a JPG would introduce. Transparency also survives a reduction, so a cut-out icon remains cut out. That makes PNG the right format to resize when the content has hard edges, small text, or an alpha channel, and it is why resizing a logo to a smaller size in PNG looks clean where the same operation in JPG would look frayed.

NotePNG keeps edges and text clean through a resize. JPG will not.

The same reducing and enlarging rules apply

A PNG reduction discards pixels and stays sharp, and an enlargement invents them and does not. The difference is that PNG enlargement looks marginally worse than JPG for photographic content, because the interpolated pixels are soft in a way that a lossy encoder would disguise with compression artefacts, and because there is no quality slider to trade against. Where an enlargement is unavoidable, using a modest output format such as JPG can hide the softness, though at the cost of the transparency and edge quality that made PNG the right choice.

• A reduction keeps remaining pixels exact and stays sharp.
• An enlargement invents pixels and cannot recover detail.
• PNG enlargement looks plainly soft. There is no quality slider to trade.
• Only enlarge when the exact target dimensions are required.

A resized PNG is often the wrong file to keep

PNG is excellent for its own purposes and frequently too large for the web. A logo saved at 1,000 pixels might be 400 KB as a PNG and 20 KB as a lossless WebP or 15 KB as an SVG if it is vector. If the goal is to display an image smaller, the more efficient route is usually to resize it and convert it in one step, or to use SVG in the first place for anything that is genuinely vector. Resizing a PNG and keeping it as a PNG solves a size problem only if the size was not actually the problem.

NoteIf the file is too large, converting is usually a better answer than resizing.

What survives the mode change

Changing the shape of a PNG follows the same rules as any other format. Crop to fill covers the frame and trims the overflow. Fit keeps everything and pads with a solid colour, which for a transparent graphic means the padding is visible unless it is matched to the background. Stretch distorts, and on a logo or an icon that is immediately obvious. For a cut-out graphic, fit with a background colour matching where it will be placed usually looks better than a crop that clips part of the mark.

• Fill: covers the frame, trims the overflow.
• Fit: keeps everything, pads with a solid colour that is visible on transparency.
• Stretch: distorts, and is obvious on a logo or icon.
• For a cut-out graphic, fit with a matched background colour.