PNG vs JPG vs WebP: Which Format Should You Use?

Quick answer: Use WebP or JPG for photographs, and PNG for logos, screenshots, or transparency. WebP usually wins on size for photos; JPG wins when forms and email only accept it; PNG loses for camera pictures. Always resize to display width before comparing formats or KB targets.

To convert photos to a modern web format, try JPG to WebP. Processing stays in your browser for normal use.

This comparison is for everyday website and upload decisions—not archival masters. For website delivery framing, see JPG vs PNG vs WebP vs AVIF for websites.

Side-by-side

• JPG — photos, email, forms; no alpha; universal

• PNG — logos, screenshots, transparency; large for photos

• WebP — photos + many graphics; smaller files; convert when portals reject it

Decision flow

1. Need transparency or pixel-perfect UI? Start with PNG (optimize when possible).

2. Photograph or gradient-heavy image? Prefer WebP, else JPG.

3. Third-party upload whitelist only JPG? Convert (WebP to JPG / PNG to JPG).

4. Always resize to display width before comparing formats.

Common mix-ups

• PNG photo exports from design tools that should have been JPG/WebP

• WebP uploaded to a portal that only lists JPG/PNG in the FAQ

• Comparing formats on a 4000 px file—resize first, then judge KB

Rough size expectations (same subject, resized)

At ~1200 px wide, a typical blog photo often lands roughly: PNG (huge) ≫ JPG ≫ WebP for the same visual quality. Exact numbers vary with detail and encoder settings—what matters is testing your hero once instead of guessing from phone originals.

Email newsletters are a special case: many clients still prefer JPG under a hard KB limit—see email newsletter image size.

What we see when preparing real uploads

We routinely see “PNG screenshots of photos” from design tools that should have been JPG/WebP—easy 5–10× weight savings after a correct export. Format debates that ignore dimensions are usually the wrong argument.

For visa and CV portals, JPG is still the safe default even when WebP would be smaller on a blog. Match the allowlist, then compress to the stated KB cap with Image Compressor or an exact KB tool.

Worked example: same photo in three formats

Export one resized photograph (1200 px wide) as JPG, PNG, and WebP at comparable visual quality.

• PNG will usually be the largest for a photo—fine for UI, wasteful for cameras.
• JPG should land in a familiar web-photo size range.
• WebP often undercuts JPG at a similar look for site delivery.

Keep PNG when you need transparency or razor-sharp flat graphics. Convert photographic PNGs to JPG or WebP before you chase tiny KB limits. Use the converters when a destination rejects the format you have.

FAQ

Is WebP better than JPG?

Often for web delivery of photos, yes at similar quality. JPG remains safer for email and legacy forms.

When is PNG still right?

When you need alpha, crisp text/UI, or lossless sharp edges. Not for vacation photos.

Can WebP have transparency?

Yes. Use WebP with alpha when your delivery stack supports it; fall back to PNG if a partner cannot.

Should I convert PNG screenshots to JPG?

If the screenshot is mostly a photograph or gradient, yes—try PNG to JPG after resize. If it is UI with text and flat colors, keep PNG (or lossless WebP) so edges stay crisp.

Final thoughts

Match format to content type, then compress. Use JPG to WebP for site photos and keep PNG for brand marks.