PNG vs JPG: The Definitive Decision Guide (With Examples)
13 June 2026
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The one-line answer: use JPG for photographs and anything built from smooth color gradients; use PNG for graphics with sharp edges, flat color, text, or transparency. Nearly every “which format?” question collapses into one distinction — does the image carry photographic detail or crisp synthetic edges?
Here’s the whole comparison, then the reasoning behind it.
| PNG | JPG (JPEG) | |
|---|---|---|
| Transparency | Yes — full alpha channel | No — none at all |
| Compression | Lossless (DEFLATE) | Lossy (DCT, quality-tunable) |
| Best for | Logos, icons, UI, screenshots, line art, text, anything needing transparency | Photographs, realistic images, smooth gradients |
| Worst for | Photos (huge files) | Sharp edges, text, flat color (visible artifacts) |
| Typical size, 12MP photo | ~15–35 MB | ~2–6 MB at quality 80–90 |
| Typical size, 800px logo | ~20–80 KB (clean) | ~60–200 KB (and fuzzy) |
| Color depth | 8 or 16 bits per channel (24- or 48-bit RGB; 32- or 64-bit with alpha), plus palette modes | 8 bits per channel (24-bit) |
| Animation | No (APNG is a separate variant) | No |
| Re-saving | Identical every time | Degrades — each save adds artifacts |
Why the split exists
The two formats were built to solve opposite problems, and that one fact explains everything downstream.
JPEG was standardized in 1992 for photographs. It splits the image into 8×8 pixel blocks, runs a discrete cosine transform on each, and quantizes away the high-frequency detail your eye barely registers — the faint tonal steps in a sky, the texture of skin. That quantization is the lossy step: the data is gone for good. On a photo it’s invisible and the payoff is huge, routinely a 10:1 reduction. On a black-on-white screenshot it’s a catastrophe, because every edge is high-frequency detail, so JPG strews gray fuzz — ringing and “mosquito noise” — around every letter.
PNG is the inverse. It’s lossless (what goes in comes back out, pixel for pixel) and it compresses by predicting each pixel from its neighbors and packing the residuals. Flat regions of identical color — a logo, a chart, a UI — collapse to almost nothing. A photograph, where scarcely two adjacent pixels match, barely compresses at all, which is why a PNG of a photo balloons to several times the JPG size for zero visible gain.
PNG also has the one thing JPG structurally lacks: an alpha channel for transparency. If a single pixel needs to be see-through, JPG is off the table.
Five real scenarios, with verdicts
A logo with a transparent background → PNG. Not a close call. JPG stores no transparency, so a JPG logo ships with an opaque (usually white) box behind it that breaks the instant you drop it on a colored page. PNG keeps the edges clean and the background gone. A flat, vector-style logo exported at display size lands around 20–80 KB as PNG — smaller and sharper than the JPG version. (If it began life as a vector, SVG beats both on the web; among raster formats, PNG wins outright.)
A 12MP holiday photo → JPG. The same image is roughly 15–35 MB as PNG versus 2–6 MB as a quality-85 JPG, with no difference a normal viewer can see. Saving it as PNG burns bandwidth and storage for nothing. Keep PNG, TIFF, or camera raw only for a master you’ll keep editing; for sharing, uploading, or archiving the finished shot, JPG is correct. Sitting on a folder of photos saved as PNG? Convert PNG to JPG will usually cut the total by 80–90%.
A screenshot of code → PNG. Code is small text on flat color — the exact pattern JPG mangles. At JPG quality 90 you’ll still catch colored fringing around the characters, and the file is often larger than the PNG because JPG handles hard edges so badly. PNG renders every glyph pixel-perfect and squeezes the flat editor background efficiently. The same goes for UI mockups, diagrams, and charts. One exception: a screenshot that is mostly a photograph (capturing a full-screen image, say) leans back toward JPG.
A scanned document → it depends, and this is where people slip. A scan of text — a contract, a printed page — behaves like a screenshot: PNG keeps the letters crisp, and if it’s bilevel or grayscale you can shrink it further with palette or grayscale mode. But a scan of a glossy photo or a painting behaves like a photograph, so JPG fits better. Judge by content, not by the word “scan.” Multi-page documents want PDF as the container; for a single page, the call still reduces to text versus continuous tone.
A meme, or text over a photo → usually JPG, with a caveat. Mixed images are the real gray zone. A photo with a caption is mostly photographic, so high-quality JPG (88–92) is the pragmatic pick; the text softens a touch but stays readable. If the type is tiny or has to stay razor-sharp, PNG is the safer bet at the cost of size. There’s no universal right answer — decide by which element you can’t afford to lose.
Common mistakes
- Saving photos as PNG. The most common waste there is: a file 5–10× larger for no visible gain. Photos go to JPG.
- Saving screenshots and logos as JPG. The mirror error — fuzzy edges and, often, a bigger file. Crisp graphics go to PNG.
- Re-exporting a JPG over and over. JPG is lossy on every save, so editing and re-saving the same file repeatedly visibly degrades it (“generation loss”). Keep a lossless master and export to JPG only at the end.
- Chasing JPG quality 100. It isn’t lossless; it just bloats the file while the lossy pipeline still runs. Quality 80–90 is the sweet spot for almost everything.
- Expecting a PNG quality slider. There isn’t one — PNG is always lossless, so “lower-quality PNG” isn’t a thing. You shrink a PNG by cutting the color count (PNG-8 / palette) or running an optimizer, not by turning a dial.
- Using PNG for transparency you don’t need. Transparency is the only reason to accept PNG’s larger size on a photographic image. Opaque picture? That reason is gone.
- Forgetting GIF, WebP, and AVIF exist. Neither PNG nor JPG animates — that’s GIF, APNG, or video. And WebP (effectively universal browser support) or AVIF (widely supported, but check older Safari and the long tail) can beat both on size. Confirm your target supports them before committing.
The mental model
Stop memorizing rules and look at the image: smooth photographic tone → JPG; sharp synthetic edges, flat color, text, or any transparency → PNG. When an image is genuinely mixed, ask which trait dominates and which one you can’t afford to lose. That one question settles the vast majority of real cases — and when you’ve guessed wrong, converting between formats (or down to a smaller modern one) takes seconds with other free tools, all of it in your browser with nothing uploaded.