JPG vs PNG vs WebP — Which Should You Resize To?

The output format you pick affects file size and quality as much as the resize settings do. Here's the short version, and when each one is the right call.

JPG (JPEG)

Lossy compression built for photographs — smooth gradients, lots of colour variation. It has no transparency support. For most photo resizing — passport photos, exam form uploads, social media posts — JPG is the right default, which is why it's this resizer's default output.

PNG

Lossless — nothing is thrown away, so quality never degrades, but files are much larger for photographic content. PNG is the right choice for screenshots, logos, graphics with flat colour or text, and anything needing a transparent background. It's the wrong choice when you're trying to hit a tiny KB target on a photo: this tool's quality search doesn't apply to PNG, since PNG ignores quality settings by design.

WebP

A newer format that typically produces 25–35% smaller files than JPG at similar visual quality, and supports transparency like PNG. Nearly all modern browsers support it. Choose WebP when file size matters most and you're not constrained to a specific format by a form or portal — many application portals still explicitly require JPG, so check the requirement first.

Quick decision guide

• Application form / passport / ID photo: JPG — almost always the required format, and quality mode compresses well.
• Screenshot, diagram, logo: PNG — keeps text and hard edges crisp.
• Website images, general sharing: WebP if allowed, otherwise JPG.
• Need transparency: PNG or WebP — never JPG, which has no alpha channel.

Switch formats any time in the Output format dropdown on the resizer — the same target-KB or pixel settings apply regardless of which one you pick.