PNG vs JPG: Which Format Should You Use?
Choose between PNG and JPG based on transparency, image content, file size, editing needs, and where the image will be used.
In this guide
Use JPG for photographs and other images with continuous color when a compact, widely compatible file matters. Use PNG for screenshots, interface graphics, diagrams, logos, and images that need transparency or lossless pixel reproduction. Neither format is universally better; the content and the next step determine the right choice.
PNG and JPG solve different problems. The PNG specification defines a lossless raster format, while JPEG is designed around lossy compression for continuous-tone images. The MDN image format guide summarizes their compression, transparency, color, and browser characteristics.
PNG vs JPG at a glance
| Decision factor | PNG | JPG |
|---|---|---|
| Compression | Lossless | Lossy |
| Transparency | Supports alpha transparency | No alpha transparency |
| Best fit | Screenshots, logos, diagrams, UI graphics | Photos, product imagery, complex scenes |
| Sharp text and lines | Usually preserves them cleanly | Can introduce ringing or block artifacts |
| Repeated editing | Better as an intermediate raster file | Repeated saves can compound loss |
| Typical photo file size | Often larger | Usually more efficient |
| Typical screenshot file size | Often efficient for flat areas | May be smaller, but edges can degrade |
These are starting points, not guarantees. A tiny icon and a detailed 40-megapixel photo behave very differently, and encoder settings can outweigh the format choice.
Choose PNG when edges and transparency matter
PNG stores image data without intentionally discarding pixel information. That makes it a natural choice for content containing repeated colors and hard boundaries:
- interface screenshots with small type;
- charts, diagrams, and instructional callouts;
- logos or badges without an available vector source;
- overlays that need partially transparent edges;
- source assets that will be edited or exported again.
Transparency is more than a background being “invisible.” PNG can store an alpha value per pixel, allowing soft shadows and anti-aliased edges to blend against different page colors. JPG cannot carry that alpha channel.
PNG is not automatically the best choice for every image with transparency. Modern formats such as WebP and AVIF can also support alpha transparency, and SVG is often preferable when the original artwork is vector-based. The point is that PNG preserves transparency reliably; it does not guarantee the smallest delivery file.
If a PNG needs to remain a PNG, the PNG compressor can look for a smaller PNG result. TinyImage may reduce the color palette during that process, so compare gradients, transparency, small text, and exact brand colors. Keep the original when the output must remain pixel-identical.
Choose JPG for photographs and broad compatibility
JPG compression is built for images whose neighboring pixels vary gradually—photographs, scanned artwork, textured backgrounds, and many product images. It reduces size by approximating visual information rather than reproducing every original pixel.
That tradeoff works well when the quality setting is chosen carefully. At an appropriate display size, a good JPG can preserve the appearance of a photo while being more practical to transfer and store than a lossless PNG version of the same scene.
JPG is less suitable for very small text, single-pixel lines, or flat shapes with sharp color boundaries. Lossy artifacts tend to collect around those edges. It also cannot preserve a transparent background. When a transparent PNG is converted to JPG, the transparent pixels must be flattened onto a solid color; TinyImage uses white for that conversion.
Use the JPG compressor when the image is already in JPG format. Re-encoding can remove more information, so compare the result carefully and return to the original source if the current JPG already shows artifacts.
Four common choices
A product photograph on a white store page
Start with JPG, WebP, or AVIF. JPG is the straightforward choice when compatibility with older software or external marketplaces matters. Export at the dimensions the store actually uses, then inspect fine texture, labels, and the edge of the product.
A software tutorial screenshot
Start with PNG. Text, icons, and one-pixel borders are the kind of detail lossless compression preserves well. Crop unused space and resize only if the instructions remain legible.
A logo over several background colors
Use PNG when the only source is raster and transparency is required. If a genuine vector source exists, SVG is often a better web asset because it scales without introducing raster pixels.
A photo that will be edited next month
Keep the original or a lossless working master. Publish a JPG delivery copy, but do not discard the better source. Opening and saving the published JPG repeatedly can accumulate compression damage.
What happens when you convert between them?
PNG to JPG
Converting a photo-like PNG to JPG can make the delivery file more practical. The change also introduces lossy compression and removes transparency. Check the intended background first, then use the PNG to JPG converter and inspect the output at its final size.
This conversion is usually a poor fit for a transparent logo or text-heavy screenshot. A smaller number in the file manager does not compensate for a visible white box, blurred lettering, or halos around an edge.
JPG to PNG
Converting JPG to PNG changes the container and prevents additional loss from PNG encoding, but it cannot recover detail that JPEG compression already removed. The PNG may also be larger because it is now storing the already-compressed appearance losslessly.
The JPG to PNG converter is useful when a downstream application requires PNG or when you need a lossless container for the next editing step. It is not a restoration tool, and it does not create real transparency from a flat JPG background.
File size depends on image content
Statements such as “JPG is always smaller” are too broad. PNG can be compact for a small graphic with few colors, while a photograph in PNG can become very large. JPG efficiency also changes with dimensions, quality, noise, and fine detail.
Make comparisons fairly:
- Start from the same original.
- Keep width and height identical.
- Export each candidate once.
- Inspect the same high-detail and low-detail regions.
- Choose the smallest version that still satisfies the visual and functional requirements.
Frequently asked questions
Is PNG higher quality than JPG?
PNG is lossless, so it preserves the encoded pixels exactly. That does not make every PNG visually better: a low-resolution PNG still has low resolution, and converting a damaged JPG to PNG cannot restore missing detail. PNG is the safer choice when exact edges or repeated editing matter.
Should website photos be PNG or JPG?
Usually JPG, WebP, or AVIF rather than PNG. Photographs contain complex continuous color that lossless PNG often stores inefficiently. Choose the format after testing the image at its delivered dimensions.
Can JPG have a transparent background?
No. Standard JPG files do not store an alpha channel. Use PNG, WebP, AVIF, or SVG when the workflow and browser support fit and transparency is required.
Does converting PNG to JPG reduce quality?
Yes, JPG encoding is lossy. The change may be hard to see at a suitable quality setting, but the result is not pixel-identical. Transparency will also be flattened, so inspect edges as well as photo detail.