JPG vs PNG vs WebP: Choosing the Right Image Format for Your Website
Direct Answer
JPG is best for photographs due to its efficient lossy compression and universal support. PNG is essential for images requiring transparency or sharp detail like logos and screenshots. WebP offers the best balance of compression and features for modern websites, producing files 25 to 35 percent smaller than JPG at the same quality. AVIF provides even better compression but has limited browser support. The right choice depends on your image content, quality requirements, and target audience.
JPG: The Universal Standard
JPG has been the standard image format on the web for decades. It uses lossy compression, achieving smaller file sizes by discarding some image data that the human eye is less likely to notice.
JPG excels at photographs and complex images with smooth colour transitions. A typical photo from a modern smartphone compressed as JPG at quality 80 looks nearly identical to the original while being 50 to 80 percent smaller. The format supports up to 16 million colours and works on every browser and device ever made.
The limitations are significant. JPG does not support transparency areas that should be transparent appear as a solid colour, usually white or black. JPG also struggles with sharp edges and text, where compression artefacts become visible as blurring or ringing around edges.
Real world example: a 5 megabyte photo from a 24 megapixel camera can be compressed to 400 kilobytes as JPG at quality 80 with no visible difference on screen.
PNG: Precision and Transparency
PNG was designed as a replacement for GIF and has become the go to format for images that need sharp detail or transparency. PNG uses lossless compression, preserving every pixel exactly as it was in the source.
PNG is ideal for logos, icons, screenshots, and any image containing text or sharp lines. The alpha channel supports variable transparency, enabling smooth edges and shadows that blend into any background colour. PNG also supports a palette mode called PNG 8 that limits colours to 256, producing much smaller files for simple graphics.
The trade off is file size. PNG files for photographic content are typically two to five times larger than equivalent JPGs. A photo that compresses to 400 kilobytes as JPG may be 1.5 to 2 megabytes as PNG with no visible quality improvement. This makes PNG unsuitable for photographs on the web.
Real world example: a logo with 12 colours and transparent background is 2 kilobytes as PNG 8 but would need to be 150 kilobytes as JPG with a white background and visible edge artefacts.
WebP: The Modern Contender
Google developed WebP to provide superior compression for both photographs and graphics. WebP supports both lossy and lossless compression as well as transparency and animation.
A lossy WebP image is typically 25 to 35 percent smaller than an equivalent JPG at the same quality level. A 400 kilobyte JPG can be 280 kilobytes as WebP with no visible difference. For lossless compression, WebP files are typically 20 to 30 percent smaller than PNG.
WebP handles photographs almost as well as JPG while also supporting the transparency features that make PNG valuable. This means you can often replace both JPG and PNG images with a single WebP version that loads faster than either original.
Browser support is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. Safari added support in 2020 and adoption has been universal since 2021. The only browsers lacking WebP support are very old versions such as Internet Explorer 11.
AVIF: The Next Generation
AVIF is a newer format based on the AV1 video codec. It offers even better compression than WebP, typically producing files 20 to 30 percent smaller than WebP at the same quality. AVIF supports HDR wide colour gamut and high dynamic range.
The main drawback is browser support. While Chrome and Firefox have supported AVIF since 2021 and 2022 respectively, Safari support arrived later and some users may still be on versions that do not support it. AVIF encoding is also significantly slower than WebP or JPG, which matters when processing many images.
AVIF is best used as an enhancement for browsers that support it, with WebP or JPEG as fallback. The picture element makes this straightforward to implement.
Format Comparison
JPG supports up to 16 million colours with lossy compression only, has no transparency support, and works on every browser. File sizes are moderate. A 5 megabyte raw photo becomes 400 kilobytes as JPG quality 80.
PNG supports up to 16 million colours with lossless compression, has variable transparency support, and works on every browser. File sizes are larger than JPG. A logo with transparency is 2 kilobytes as PNG 8.
WebP supports up to 16 million colours with both lossy and lossless compression, has transparency and animation support, and works on all modern browsers. File sizes are smaller than JPG for lossy and smaller than PNG for lossless. A 400 kilobyte JPG becomes 280 kilobytes as WebP.
AVIF supports HDR and wide colour gamut with both lossy and lossless compression, has transparency support, and works on newer browsers. File sizes are smaller than WebP. A 280 kilobyte WebP becomes 200 kilobytes as AVIF.
When to Use Each Format
Use JPG for photographs, complex illustrations, and any image where small file size is the priority and transparency is not required. Most blog images, hero banners, and product photos work well as JPG.
Use PNG for logos, icons, screenshots, images with text, and any graphic that needs transparent backgrounds. If the image has fewer than 256 colours, use PNG 8 for smaller files.
Use WebP as the default format for modern websites. Serve WebP as the primary format with a JPG or PNG fallback for older browsers using the picture element.
Use AVIF as an enhancement for users with supporting browsers. Add AVIF as the first option in the picture element with WebP and JPEG fallbacks.
How to Convert Between Formats
Use our JPG to WebP converter at /tools/jpg-to-webp and PNG to WebP converter at /tools/png-to-webp to switch to modern formats. For converting to older formats, use WEBP to JPG at /tools/webp-to-jpg, JPG to PNG at /tools/jpg-to-png, and PNG to JPG at /tools/png-to-jpg. Our Image Compressor at /tools/image-compressor handles compression for all formats with adjustable quality settings. All tools process files entirely in your browser with no server uploads.
Frequently Asked Questions
Does WebP support animation?
Yes. WebP supports animated images similar to GIF but with much better compression. Animated WebP files are typically 30 to 50 percent smaller than equivalent GIFs.
Can I convert existing images to WebP in bulk?
Most online converters process one image at a time. For batch conversion, use our converters repeatedly or use command line tools.
Will WebP help my SEO?
Yes. WebP files load faster than JPG or PNG equivalents, which improves page speed metrics. Google considers page speed a ranking factor, so switching to WebP indirectly boosts SEO.
Is there any reason to avoid AVIF?
AVIF offers the best compression but has limited browser support. Use AVIF as an enhancement with WebP or JPEG fallbacks rather than as the primary format.
What format should I use for a new website?
Use WebP as the primary format with JPEG fallback. Add AVIF as an enhancement. Use PNG only for images that specifically need lossless transparency.
Next Steps
Start converting your images to modern formats using our free online converters at /tools/jpg-to-webp and /tools/png-to-webp. For comprehensive image optimisation, use the Image Compressor at /tools/image-compressor. Explore the full range of Image Tools for resizing, cropping, and editing.