Which is smallest: PNG, WebP, or JPG?

It depends on the image. For photos, WebP is usually smallest, followed by JPG, with PNG far larger. For flat graphics, screenshots, or transparency, PNG or lossless WebP win and JPG looks bad with sharp edges and text.

Is WebP always smaller than JPG?

Usually but not always. On typical photos, WebP commonly saves roughly 25 to 35 percent over a comparable-quality JPG. On some images the gap narrows, and a heavily optimized JPG can occasionally match it, but WebP generally comes out ahead.

Why is my PNG so much bigger than a JPG of the same photo?

PNG is lossless — it stores every pixel exactly, which is enormously expensive for the smooth gradients and noise in a photo. JPG and WebP throw away detail your eye barely notices, so they end up many times smaller on photographs.

When should I keep using PNG even though it is bigger?

When you need transparency, perfectly crisp text and edges, exact colors, or a lossless master for editing. Screenshots, logos, icons, and UI graphics all look better and often compress smaller as PNG than as JPG.

PNG vs WebP vs JPG File Size: Which Is Smallest?

Why "which is smallest" has no single answer

File size is not a fixed property of a format — it is the result of how well a format's compression matches the contentof your image. JPG and WebP excel at the smooth tones and gradients of photographs. PNG excels at the flat colors, sharp lines, and hard edges of graphics. Ask "smallest for what?" and the answer flips depending on whether you're saving a sunset or a logo.

Lossy vs lossless is the key

PNG is lossless— it reconstructs every pixel exactly, which is why it's large on complex images. JPG is lossy— it discards detail your eye barely registers to shrink photos enormously, but it smears sharp edges and text and can't store transparency. WebP does both: a lossy mode that competes with JPG and a lossless mode that competes with PNG, plus an alpha channel. That flexibility is why WebP so often ends up the smallest option overall.

For photographs

Photos are where lossy formats shine. A typical photo saved as PNG can be several times larger than the same photo as JPG, because PNG refuses to throw anything away. Between the two lossy options, WebP usually wins, commonly producing files around 25 to 35 percent smaller than a comparable-quality JPG. So for photos the ranking is normally WebP smallest, JPG close behind, and PNG far larger — choose PNG here only if you truly need a lossless master.

For flat graphics, screenshots, and transparency

Now the picture inverts. Logos, icons, UI screenshots, and anything with large flat areas, crisp text, or sharp edges compress extremely well as PNG— often smaller than a quality-matched JPG, and without the blocky "ringing" artifacts JPG produces around hard edges. JPG also can't do transparency at all. Lossless WebP frequently edges out PNG on these images while keeping the alpha channel, so the real contest here is PNG versus lossless WebP — with JPG out of the running.

Smallest format by image type

Image type	Usually smallest	Avoid
Photographs	WebP, then JPG	PNG (huge)
Screenshots	PNG or lossless WebP	JPG (fuzzy text)
Logos & icons	PNG or lossless WebP	JPG (no alpha)
Transparency needed	WebP, then PNG	JPG (impossible)
Lossless master	PNG or lossless WebP	JPG (lossy)

Making any of them smaller

Whatever format you land on, there's usually more to save. You can shrink a PNG losslessly with compress PNG, trade it for a smaller modern file with PNG to WebP, or convert a photo to a lighter lossy file with PNG to JPG. Everything runs in your browser — see the full set in tools.

Frequently asked questions

Which is smallest: PNG, WebP, or JPG?: It depends on the image. For photos, WebP is usually smallest, followed by JPG, with PNG far larger. For flat graphics, screenshots, or transparency, PNG or lossless WebP win and JPG looks bad with sharp edges and text.
Is WebP always smaller than JPG?: Usually but not always. On typical photos, WebP commonly saves roughly 25 to 35 percent over a comparable-quality JPG. On some images the gap narrows, and a heavily optimized JPG can occasionally match it, but WebP generally comes out ahead.
Why is my PNG so much bigger than a JPG of the same photo?: PNG is lossless — it stores every pixel exactly, which is enormously expensive for the smooth gradients and noise in a photo. JPG and WebP throw away detail your eye barely notices, so they end up many times smaller on photographs.
When should I keep using PNG even though it is bigger?: When you need transparency, perfectly crisp text and edges, exact colors, or a lossless master for editing. Screenshots, logos, icons, and UI graphics all look better and often compress smaller as PNG than as JPG.