"Which format should I save this as?" It's the question that comes up every time you export an image, and the honest answer is: it depends on what the image is and where it's going. Pick wrong and you either ship a file five times bigger than it needs to be, or you ship a blurry mess. This guide breaks down JPG, PNG, and WebP in plain terms, with real size numbers and a decision tree you can follow without thinking.
The one-paragraph difference
JPG (JPEG) is a lossy format built for photographs. It throws away detail the human eye barely notices to make files small. It has no transparency. PNG is a lossless format built for graphics: screenshots, logos, icons, anything with sharp edges or text. It supports transparency but produces much bigger files for photos. WebP is the modern best-of-both: it does lossy and lossless, supports transparency, and lands 25–35% smaller than JPG/PNG at the same quality — but not every old app can open it.
Head-to-head comparison
| JPG | PNG | WebP | |
|---|---|---|---|
| Compression | Lossy only | Lossless | Both lossy & lossless |
| Transparency | No | Yes (full alpha) | Yes (full alpha) |
| Best at | Photos | Screenshots, logos, graphics | Web images (both types) |
| Photo size* | ~2.4 MB | ~8 MB | ~1.5 MB |
| Screenshot size* | ~1.8 MB, blurry text | ~350 KB, crisp | ~200 KB, crisp |
| Compatibility | Universal since 1992 | Universal | All modern browsers; some old apps fail |
*Approximate real figures for a 12-megapixel photo and a typical desktop screenshot; actual numbers vary by content.
The decision tree: 10 seconds to the right answer
Walk these three questions in order and you're done:
- Does the image need transparent pixels? If yes (a logo on a website, an icon, a cutout product shot), it's PNG — unless the destination browser fully supports WebP, in which case WebP-lossless is smaller and identical. Never use JPG with transparency; the transparent areas turn into an ugly black or white box.
- Is it a photograph or a complex, smooth-gradient scene? If yes, use JPG — or WebP-lossy if it's going on your own website. JPG artifacts are essentially invisible in photos, and the files stay small.
- Is it a screenshot, diagram, UI grab, or anything with text or hard edges? Use PNG. JPEG smears text into a fuzzy halo around letters, which looks terrible in documentation. WebP-lossless also works here and saves space.
What about where the image is going?
The destination flips the choice in two common cases. If the image goes into a print shop, stick to JPG (or TIFF) — print software rarely reads WebP. If the image goes on your own website, WebP is almost always the correct choice for both photos and graphics, because smaller files mean faster pages and better search ranking. When a website upload form only accepts JPG/PNG, convert to whichever of those two fits the content.
Real examples from my own work
A few concrete conversions that stick in my memory:
- A hero photo for a landing page: the original camera JPG was 4.8 MB. Re-saved as WebP-lossy at 85% it dropped to 900 KB with zero visible difference on screen. That's a five-fold speedup on first paint.
- A screenshot of a code error: saved as JPG it was 1.6 MB, and the error message text was fuzzy enough that I had to zoom to read it. Saved as PNG it was 280 KB and perfectly sharp — because screenshots compress extremely well losslessly.
- A logo with a transparent background: someone exported it as JPG and the transparent corner filled with white, breaking it on a dark website. Re-exported as PNG (or WebP) the transparency survived.
Transparency: the make-or-break detail
People trip over this constantly. JPEG cannot store an alpha channel. So the moment you save a transparent PNG or WebP out as JPG, the holes get filled — usually with black if the converter is lazy, or white if it's sensible. If you're flattening a transparent logo onto a photo anyway, that's fine; but if the background matters, keep PNG/WebP. Our tri-directional converter explicitly warns you when a PNG → JPG conversion will lose transparency, and lets you pick the background color to fill with.
When you're not sure, convert both and compare
Because these conversions are free and local, I often test both: export the same image as JPG and as WebP, put them side by side on the screen, and check the file sizes. Nine times out of ten the smaller one looks identical, and that's the one I ship. If you're moving between the three formats regularly, the WebP converter and the format swapper handle the round trips without uploading anything.
Switch between JPG, PNG and WebP in your browser — pick the right format per image, batch included.
Open the image format converterFrequently asked questions
Which format is smallest?
WebP wins for almost everything: ~25–35% smaller than JPG for photos and ~26% smaller than PNG for graphics, at the same visual quality. The catch is compatibility — if an app or upload form can't read WebP, JPG or PNG wins by actually working.
Why does my JPG screenshot look blurry?
Because JPEG is lossy and smears hard edges — text, icons, line art — into fuzzy halos. Screenshots should always be PNG or WebP-lossless, which compress sharp text perfectly and often end up smaller than the JPG anyway.
Can JPG have a transparent background?
No. JPEG has no alpha channel. Any transparency in a source image is flattened to a solid color (white or black) when saved as JPG. Use PNG or WebP if you need transparent pixels.
Should I use WebP on my website in 2026?
Yes — all current browsers support it, and the file-size savings directly improve page speed. Keep JPG or PNG fallbacks only if you must support very old browsers; for most audiences, WebP alone is fine.
Is PNG higher quality than JPG?
They optimize for different things. PNG is lossless so it never degrades detail, but it's lossless-inefficient on photos (huge files). JPG is lossy but invisible on photos at high quality. "Better" depends on the content — PNG for graphics, JPG for photos.
