PNG vs WebP vs JPEG for Logos: Which Format Should You Use?

Our test: one logo, seven encodings

We took a simple 900 × 300 px two-colour sample logo (icon plus wordmark on a transparent background — the same sample file offered on our tool pages) and encoded it with standard settings using the GD image library. Here are the file sizes:

Two results surprise most people. First, JPEG was the biggest file, not the smallest. JPEG is built for photographs, where smooth gradients compress well; the hard edges of a logo force it to spend bytes on every boundary. Second, lossless WebP matched a palette PNG at under a third of the standard PNG size, with zero quality loss.

Your numbers will differ with logo complexity: a logo with gradients, shadows or a photo inside behaves more like a photograph, and lossy WebP or AVIF gain a bigger advantage. But for the typical flat business logo, the pattern holds.

What JPEG does to logo edges

JPEG compresses an image in 8 × 8 pixel blocks and discards fine detail it thinks the eye will not miss. Around the sharp boundary between a letter and its background it produces ringing (faint ghost outlines) and blocking (blotchy squares of off-colour). On a photo you never notice. On a flat blue logo on white, it is obvious as soon as someone zooms in or the platform recompresses the file again.

PNG: the safe default

Strengths: lossless, full transparency, accepted by every website, social network, email client, document editor and print shop.

Weaknesses: larger than WebP; big for photographic content.

Tip — PNG-8: most logos use only a handful of colours. Saving as an 8-bit palette PNG (up to 256 colours) often cuts the file by 60–75% with no visible change, and still supports transparency. Tools like the Image Compressor or pngquant do this automatically. Watch gradients: a smooth gradient reduced to a palette can show banding.

WebP: best for your own website

Strengths: both lossless and lossy modes, full transparency in both, typically 25–35% smaller than PNG (much more for flat logos, as our test shows). Supported by every current major browser.

Weaknesses: some upload forms, older CMS plugins, print workflows and email clients still reject or mishandle it. If a platform refuses your WebP, convert it back with the WebP Converter.

Use it for: the logo in your website header and footer (if you cannot use SVG), logos in blog content, partner logo strips.

JPEG: only when you have no choice

Strengths: universal support; efficient for photos.

Weaknesses: no transparency, edge artefacts, and it degrades further every time it is re-saved or recompressed by a platform.

Use it for: a logo placed on a photo (then it is really a photo), or a platform that only accepts JPG. Keep quality at 85–92 and use a solid background.

What about SVG and AVIF?

SVG is not a pixel format at all — it stores shapes — so it stays perfectly sharp at every size, is often only 1–5 KB for a simple logo, and can be styled with CSS. It is the best choice for website headers when you have a genuine vector. It is not accepted by most social networks or email clients. We compare it in detail in PNG vs SVG for websites.

AVIF compresses even better than WebP for complex images and supports transparency; browser support is now broad. For simple flat logos the gain over lossless WebP is small (our AVIF was actually larger than lossless WebP), and tool support is thinner, so we treat it as optional.

Decision table: which format for which job

Dimensions matter more than format

The most common cause of a heavy logo file is not the format — it is a 3000 px wide image displayed at 200 px. Resize to the size you need (2× the display size for screens) before worrying about format. Our test logo at 900 px was 8 KB as PNG; the same design exported at 4000 px wide would be several times heavier in every format. See logo file size too large for the full slimming checklist.