How to convert JPG to WebP
- Tap Choose image above and pick one or more JPG, PNG or other images.
- On the Convert tab, Convert to is already WebP. Pick a quality: High (92%), Good (80%) or Compact (60%).
- Tap Convert. Several files are converted one after another and packed into a ZIP.
- Check the result line for the new file size, then tap Download result.
To go the other way, choose your WebP file and set Convert to to JPG.
How much smaller is WebP? We measured it
WebP is often described as "25–35% smaller than JPEG". On real camera photos the answer depends heavily on the photo and the quality setting. We converted five photos with this tool and saved each one as WebP and as JPG at the same quality setting:
| Photo (original JPG) | High (92%) WebP / JPG | Good (80%) WebP / JPG | Compact (60%) WebP / JPG |
|---|---|---|---|
| Portrait, plain wall (26 MP) (2.71 MB) | 2.24 MB / 3.12 MB | 767 KB / 2.32 MB | 423 KB / 947 KB |
| Indoor selfie (24 MP) (2.14 MB) | 1.56 MB / 2.43 MB | 502 KB / 1.78 MB | 291 KB / 743 KB |
| Busy street market (24 MP) (5.52 MB) | 7.21 MB / 5.99 MB | 4.55 MB / 4.83 MB | 3.27 MB / 3.83 MB |
| Group photo outdoors (24 MP) (4.84 MB) | 5.71 MB / 5.18 MB | 3.16 MB / 4.21 MB | 2.05 MB / 3.33 MB |
| Clear sky, little detail (12 MP) (1.01 MB) | 434 KB / 1.04 MB | 87 KB / 439 KB | 49 KB / 130 KB |
Test photos: free-to-use Unsplash photos (12–26 megapixels; Unsplash re-encodes its downloads), converted with this page's tool in desktop Chromium on our test server, October 2026. Bytes are exact; sizes in decimal units (1 MB = 1,000,000 bytes).
What the numbers show:
- At Good (80%), WebP was smaller for every photo: about a third of the JPG size for the portrait (767 KB against 2.32 MB), just over a quarter for the selfie, a fifth for the clear sky, and 6–25% smaller for the busy market and group photos.
- At High (92%), WebP can be bigger. The street market came out at 7.21 MB as WebP against 5.99 MB as JPG (larger than the original), and the group photo at 5.71 MB against 5.18 MB. Very detailed photos at a high setting don't benefit.
- Simple photos gain most. Skies, plain walls and smooth skin compress far better in WebP; dense detail such as leaves, crowds and market stalls gains least.
The same quality number doesn't mean exactly the same visible quality in both formats, so compare the results by eye. For most website photos, Good (80%) WebP is the setting to start with.
When to use WebP, and when not to
Use WebP for images shown on websites and in apps: every current major browser displays it, and smaller files load faster. Don't use it for application forms. Government, exam and visa portals almost always ask for JPG (JPEG), and a WebP file renamed to ".jpg" still fails, because portals check the file's contents, not its name. If a form rejected a WebP file, convert it to JPG here, then meet the form's size limit with compress to an exact KB.
Pixel size and transparency
Conversion keeps the image's pixel size; nothing is cropped or resized. WebP can keep transparency, so a transparent PNG stays transparent as WebP. Converting to JPG fills transparent areas with white, because JPG has no transparency.
Common mistakes
- Converting at High and expecting a smaller file. As the table shows, detailed photos can grow. Try Good (80%).
- Converting a heavily compressed JPG. WebP can't recover detail the JPG already lost, and re-encoding adds a little more loss. Start from the best original you have.
- Uploading WebP to a form that says JPG. Convert to JPG instead.
- Converting the same image back and forth. Each conversion re-encodes the image and loses a little quality.
Frequently asked questions
Is WebP always smaller than JPG?
No. In our tests WebP at Good (80%) was smaller for every photo, by 6% to 80%. At High (92%) the two most detailed photos, a street market and a group outdoors, came out bigger as WebP than as JPG.
Which quality setting should I use for a website?
Start with Good (80%) and check the result by eye. Use High (92%) for photos where fine detail matters, and Compact (60%) for thumbnails.
Can I convert WebP back to JPG?
Yes. Choose the WebP file and set Convert to to JPG. Forms that reject WebP accept the result.
Does converting change the pixel size?
No. The image keeps its width and height. To resize, use the Dimensions tab.
Does WebP keep transparency?
Yes. A transparent PNG converted to WebP stays transparent. JPG has no transparency, so converting to JPG fills it with white.
Can I convert many images at once?
Yes. Choose several files; each is converted with the same settings and they download together as a ZIP.
Are my images uploaded?
No. The conversion uses your browser's own encoder, on your device. It also works offline once the page has loaded.
Do all browsers show WebP?
All current versions of Chrome, Edge, Firefox and Safari display WebP. Some older software and many upload forms don't accept it, which is why JPG is still the safe choice for forms.