PNG vs JPG vs WebP: Which Image Format to Use

PNG, JPG, and WebP each handle image data differently, so the best format depends on what the image contains and where you plan to use it. Use JPG for many photographs, PNG when you need lossless detail or transparency, and WebP when you want a modern format that supports both lossy and lossless compression.

The main differences

Format	Compression	Transparency	Often a good fit for
JPG (JPEG)	Lossy	No	Photographs and complex images without transparent areas
PNG	Lossless	Yes	Logos, screenshots, diagrams, and images with transparent backgrounds
WebP	Lossy or lossless	Yes	Web images where you want flexible compression and broad modern-browser support

These are useful starting points, not strict rules. The best way to choose is to compare the resulting file at the size and quality you actually need. A format’s name alone does not guarantee a smaller file or a better-looking image.

How compression differs

Lossy compression reduces file size by discarding some image information. The change may be hard to notice at a suitable quality setting, but repeated editing and saving can introduce additional degradation. JPG uses lossy compression. WebP can also use lossy compression.

Lossless compression reduces file size without discarding the original image data. The image can be reconstructed exactly from the compressed file, although the file may still be larger than a lossy version. PNG uses lossless compression, and WebP has a lossless mode.

Compression results depend on the image. A photograph contains many gradual changes in color and texture, which lossy compression can often represent efficiently. A screenshot with sharp text, flat colors, or fine edges may show compression artifacts more clearly. For such images, lossless compression can preserve crisp detail, though it may produce a larger file.

When to use JPG

JPG, also written JPEG, is a long-established lossy format commonly used for photographs. It does not support transparency. If you save an image with transparent areas as JPG, those areas must be filled with a solid background color.

JPG is a practical choice for photos when a smaller file matters and a little loss of detail is acceptable. It is also useful when sharing images with older software or devices, since JPEG is supported by a wide range of image viewers and applications.

Avoid JPG when you need a transparent background or when sharp boundaries and small text must remain clean. Strong compression can create visible blocks, halos, or smudging around edges. If you edit a JPG repeatedly, keep an original copy and export a new version from that source rather than repeatedly saving over the same file.

When to use PNG

PNG uses lossless compression and supports transparency, including partially transparent pixels. That makes it useful for logos, icons, interface elements, diagrams, and screenshots where clean edges or exact pixels matter.

PNG is not automatically the best choice for every graphic. A large photograph saved as PNG can be much larger than a visually similar lossy version. If the photo does not need transparency or exact pixel preservation, JPG or lossy WebP may be more suitable.

PNG is also a common choice when you want to preserve an image without adding lossy artifacts during export. It is not a substitute for the original editable project file, however: layers, vector paths, and other authoring data are not retained in an ordinary flattened PNG.

When to use WebP

WebP supports both lossy and lossless compression, as well as transparency. This means it can be used for photos and for graphics that need transparent areas. Depending on the image and settings, it may produce a smaller file than a comparable PNG or JPG, but results vary; compare the actual output rather than assuming it will always be smaller.

WebP is supported by current versions of major browsers. If an image must work in an older browser, legacy application, or a workflow that does not recognize WebP, check compatibility before choosing it as the only copy. Keep a source image in a format suited to future editing, and export WebP versions for places that support them.

For websites, a page can offer WebP alongside a fallback format so a browser can use a format it supports. For a simple download or an image that will be opened in unknown software, JPG or PNG may be the safer compatibility choice.

What about AVIF?

AVIF is another modern image format that can provide efficient compression and supports features such as transparency. It is supported in current versions of major browsers, but compatibility can still depend on the browser version and the software used to create, edit, or view the file. If broad compatibility matters, test AVIF with the tools and devices your audience uses, or provide a fallback such as WebP, JPG, or PNG.

AVIF is not automatically the right replacement for every image. Encoding speed, editing support, quality settings, and the specific image can affect whether it is a good choice for your workflow. Treat it as an option to test, not a guarantee of a smaller file.

A practical way to choose

Start with the image’s purpose:

• Photograph, no transparency: Try JPG or lossy WebP. Compare visible quality and file size.
• Logo or graphic with transparent areas: Use PNG or WebP with transparency. Confirm that the destination supports the format.
• Screenshot, chart, or text-heavy image: Try PNG or lossless WebP if sharp edges are important. Check the result at its intended display size.
• Image for unknown or older software: Prefer JPG for photos and PNG for graphics or transparency, unless you have confirmed that the software supports another format.

Worked example: a product photo and a logo

Suppose an online shop has a product photograph on a plain background and a logo that must sit on top of different page colors. For the product photo, export a JPG and a lossy WebP at settings that look acceptable, then compare the file sizes and inspect details such as fabric texture and edges. Keep the one that best balances visual quality and size for the shop’s needs.

For the logo, use PNG or lossless WebP so the background remains transparent and the edges stay clean. If the shop’s publishing system or audience cannot handle WebP reliably, use PNG. The photo and logo do not need to use the same format just because they appear on the same page.

Convert and compare

If you already have an image, use the Image Converter to make another format for comparison. Conversion re-encodes the image and drops EXIF metadata, and AVIF appears as an output option only if your browser can encode it. Look at the image at its intended display size, check whether transparency is preserved, and confirm that text and edges still look right.

When the format is chosen, the Image Compressor can help you reduce file size. Compression settings and output quality matter, so inspect the result rather than relying on the file extension. Keep an original copy before converting or compressing, especially if the new file uses lossy compression.

Summary

• Use JPG for many photographs when transparency is not needed and lossy compression is acceptable.
• Use PNG for transparency, crisp graphics, and lossless preservation, but expect photos to be comparatively large in some cases.
• Use WebP when you want lossy or lossless compression with transparency and your target software supports it.
• Consider AVIF for modern workflows, but test compatibility and the actual output before relying on it.