Use WebP for images on your own website, JPG for photos you need to open anywhere, and PNG for logos, screenshots and anything with transparency. That is the short answer. WebP gives you the smallest files at the same visual quality, JPG works on every device and form, and PNG keeps text and edges perfectly sharp. The rest of this guide shows you exactly when each format wins, with a decision table you can use for every image on your site.
Lossy vs Lossless: The One Idea That Explains Everything
Every image format makes a trade. Lossy compression throws away some image data to make the file smaller. You cannot get that data back, but your eye rarely notices what is gone. JPG and lossy WebP work this way. Lossless compression shrinks the file without throwing anything away. Every pixel you save is exactly the pixel you get back. PNG and lossless WebP work this way. Once you understand this difference, the choice between JPG, PNG and WebP becomes simple. Photos suit lossy compression because they are full of smooth colour changes. Logos and screenshots need lossless compression because they are full of sharp edges and flat colour.
JPG Explained: Small Files, No Transparency
JPG, also written as JPEG, is the oldest of the three formats and still the most widely supported. It uses lossy compression, which makes it excellent for photographs. A photo saved as JPG is far smaller than the same photo saved as PNG, and the quality loss is hard to spot at normal viewing sizes. Every phone, printer, email client and upload form accepts JPG. That is its greatest strength.
JPG has two real limits. First, it cannot store transparency. A logo saved as JPG will always sit on a solid background, usually white. Second, quality drops each time you open, edit and save a JPG again, because each save throws away a little more data. So keep your original photo in a lossless format and export a JPG only when you need to share or upload it.
Use JPG for photos you email, print, or upload to forms and portals. Use it for product photos on marketplaces that reject newer formats. Do not use JPG for logos, icons, screenshots, or any image that contains text.
PNG Explained: Sharp and Lossless, but Heavy
PNG uses lossless compression, so it keeps every pixel exactly as it was. Text stays readable, lines stay crisp, and flat colours stay clean. It also supports full transparency, which makes it the right choice for logos that must sit on any background. For screenshots, diagrams, charts and anything with text, PNG is still the safest pick.
The price of that quality is file size. A photograph saved as PNG can be several times larger than the same photo saved as JPG. On a website, that extra weight slows the page down, and slow pages lose visitors. PNG is therefore a format for graphics, not for photos. Save a screenshot as PNG and it stays sharp. Save a photo as PNG and you pay for quality nobody can see.
Use PNG for logos with transparent backgrounds, screenshots, icons, diagrams and images that contain text. Keep a PNG copy as your master file when you design a logo, because you can always export a smaller format from it later. Do not use PNG for photographs on a website.
WebP Explained: The Best of Both Worlds
WebP was built by Google for the web, and it can do both jobs. It has a lossy mode for photos and a lossless mode for graphics, and both modes support transparency. That means one format can replace JPG for your photos and PNG for many of your graphics, while producing smaller files than either.
Google reports that lossy WebP files are 25 to 34 percent smaller than JPG files of similar quality, and lossless WebP files are about 26 percent smaller than PNG files. On a website with many images, that saving adds up fast. Smaller images load faster, and faster pages score better on Core Web Vitals, the speed signals Google uses when it ranks pages.
Every current major browser displays WebP, including Chrome, Edge, Firefox and Safari. The catch is outside the browser. Some older desktop programs, some email clients and many upload forms still do not accept WebP. If you have ever downloaded an image from a website and found you could not open it or upload it, it was probably a WebP file. That is why you should use WebP on your own website, where you control the browser experience, and keep JPG for anything that leaves your website.
JPG vs PNG vs WebP: The Comparison Table
| Feature | JPG | PNG | WebP |
|---|---|---|---|
| Compression | Lossy only | Lossless only | Lossy or lossless |
| Transparency | No | Yes | Yes |
| Animation | No | No | Yes |
| Best for | Photos to share, print or upload | Logos, screenshots, text and graphics | Photos and graphics on your own website |
| File size for a photo | Medium | Large | Smallest |
| Quality on re-save | Drops each time | Never drops | Drops in lossy mode only |
| Browser support | Universal | Universal | All current browsers |
| Email and upload forms | Accepted everywhere | Accepted almost everywhere | Often rejected |
Which Format Should You Use? A Decision Guide
Pick by what is in the image and where it will be seen. Ask these questions in order and you will land on the right format every time.
Is it a photograph?
If the image will live on your own website, use WebP. It gives you the same look in a smaller file, so your pages load faster. If the photo will be emailed, printed, or uploaded to a form or portal, use JPG, because it opens everywhere.
Does it need a transparent background?
Never use JPG, because JPG cannot store transparency. For a logo or icon on your own website, use lossless WebP. For a logo you send to a designer, a printer, or another program, use PNG.
Does it contain text, a screenshot, or a diagram?
Use PNG, or lossless WebP if the image will only be seen in a browser. Lossy formats blur sharp edges and make small text hard to read, so keep these images lossless.
Is it a hero image or a large banner?
Use WebP at quality 80 for your website, because a hero image is often the largest file on the page and it sets the speed of the whole page. Keep a JPG copy as a fallback if your site serves older browsers, or let your image plugin handle the fallback for you.
Is it going into a document, an email, or an upload form?
Skip WebP entirely. Use JPG for photos and PNG for graphics. Compatibility matters more than file size when you do not control the software that opens the file.
How to Use These Formats in WordPress
WordPress has supported WebP uploads since version 5.8, so you can upload WebP images to your media library just like JPG and PNG. WordPress also creates WebP versions of your JPG uploads automatically in newer versions, which means your site can serve the smaller file without extra work. Check your media library after uploading to confirm the WebP version exists.
Follow this workflow for every image you add to a post. First, resize the image to the size it will actually display. A 4000 pixel wide photo shown at 800 pixels wastes most of its file size. Second, pick the format using the decision guide above. Third, compress the file before you upload it. Our guide on how to compress images for a website without losing quality walks through free tools that do this without visible quality loss. Fourth, give the file a clear name with words that describe the image, because search engines read file names.
If you already have a site full of JPG and PNG images, you do not need to replace them one by one. An image optimisation plugin can convert your existing library to WebP and serve the smaller version to browsers that support it, while keeping the original as a fallback. Test one page after you switch it on and check that every image still displays.
One last WordPress tip: if a visitor saves an image from your site and cannot open it, that is the WebP compatibility problem in reverse. Readers who download your images will sometimes need a JPG. Our guide on how to save WebP as JPG on Windows 11 shows the quickest fix, and it is worth linking to it when readers ask.
Common Mistakes to Avoid
Uploading a photo as PNG is the most common mistake. The image looks the same as a JPG but the file is several times larger, and every extra kilobyte slows the page. Saving a logo as JPG is the second mistake. The white box around the logo looks unprofessional and it cannot be removed. Re-saving a JPG again and again is the third mistake. Each save throws away more detail, so edit the original and export a fresh JPG at the end. Finally, do not serve WebP to email subscribers or upload it to forms that reject it. Use the format that fits the destination, not the format you like best.
FAQs
Is WebP better than JPG for websites?
Yes, for images on your own website. WebP files are typically 25 to 34 percent smaller than JPG files at similar quality, and they support transparency, which JPG does not. Keep JPG for photos you email, print, or upload to forms.
Is PNG better than WebP for logos?
For a logo on a website, lossless WebP is just as sharp as PNG and smaller. For a logo you send to a designer or a printer, PNG is still the safer choice, because every design program accepts it and some do not accept WebP yet.
Can I use WebP in WordPress?
Yes. WordPress has supported WebP uploads since version 5.8, and newer versions also generate WebP copies of your JPG uploads automatically. You can upload WebP files to the media library like any other image.
Why do some websites save images as WebP?
Because WebP files are smaller, so pages load faster and use less data. When you download an image from a website it often arrives as WebP, and some older programs cannot open it. Converting it to JPG fixes that.
What is AVIF, and should I use it instead?
AVIF is a newer format that can produce even smaller files than WebP, but browser and software support is still catching up. For most websites in 2026, WebP is the practical choice, and AVIF is worth adding only if your platform or CDN creates it automatically with a WebP or JPG fallback.
Conclusion
There is no single best image format, only the right format for each image. Use WebP for images on your own website, where smaller files mean faster pages. Use JPG for photos that must open anywhere, from email to upload forms. Use PNG for logos, screenshots and anything with transparency or text. Pick the format by asking what is in the image and where it will be seen, and you will never get it wrong. If you found this guide useful, read our image compression guide next and put the workflow into practice on your next post.
