JPG vs PNG vs WebP: Which Image Format Should You Use?

The short answer: compare by content and destination

There is no universally best image format. A photo, text screenshot, transparent logo, and animation place different demands on the encoder. Choose the format with the least costly compromise for that image and the software that will receive it.

Browser support is generally strong for JPEG, PNG, and WebP in current browsers. AVIF support is also widespread in modern browsers, but older devices, editing software, upload systems, and email clients may have different limits. Check your real destination rather than assuming browser support implies workflow support.

JPEG: a dependable default for photos

JPEG's lossy encoding exploits the fact that natural photos contain continuous tones. It can reduce a camera photo dramatically without obvious change at its final display size. It cannot preserve transparent pixels and is poor at sharp colored text or thin lines. At too low a quality, look for block grids, edge halos, and bands in skies.

For a broad-audience attachment or an upload system that only accepts JPG, JPEG is still the safest choice. Start with an automatic result, then compare details rather than fixing every photo at one quality number. Learn more in the JPEG quality guide.

PNG: transparent shapes and clean edges

PNG keeps represented pixel values exactly. That is valuable for screenshots, charts, icons, and elements that need transparency. A photographic PNG can be enormous because it tries to preserve millions of subtle colors that lossy encoders would simplify.

An indexed PNG8 palette may reduce a flat graphic substantially. It also limits the available colors, so test gradients, antialiasing, and transparency. Do not search for a JPEG-like "PNG quality" value; see PNG8 color quantization.

WebP: a practical web compromise

WebP supports lossy photos, lossless graphics, alpha transparency, and animation. For many photos, it achieves a smaller output than JPEG at a comparable appearance. But conversion is not free: a source already compressed heavily as JPEG does not regain its lost detail by becoming WebP, and some simple graphics remain smaller as PNG.

Use the image compressor to compare a WebP output with the source at the same display size. Compression mode keeps the original format; use the Convert tab when you explicitly want a different format. Confirm that your CMS, messaging app, or recipient accepts WebP before making it the only delivered file.

AVIF: strong compression with workflow constraints

AVIF can produce impressive reductions, particularly for complex photos, and supports transparency. Encoding can be slower, and older software or third-party uploaders may reject it. Treat the final destination as part of the format decision. Keep a JPEG or WebP fallback if needed.

When conversion helps, and when it does not

• Photo PNG to JPEG/WebP: often a substantial reduction if transparency and exact pixels are unnecessary.
• Transparent icon PNG to WebP: may save bytes; check edge quality and downstream compatibility.
• High-quality JPEG to WebP: worth comparing, especially for web delivery.
• Already degraded JPEG to PNG: usually a much larger file containing the same degraded pixels.
• JPEG to JPEG repeatedly: can add generation loss even if the slider is set higher.

Local browser support does not guarantee that an external system will accept a file. If an upload form specifies JPG, provide JPG even if WebP is smaller. For an implementation walkthrough, open the image compression tutorial and compare format-specific settings in the tool.