How to Convert JPG to WebP

JPG is everywhere, but WebP does the same job at roughly 25–35% smaller file sizes with no visible difference. Converting is the single highest-impact step you can take for faster page loads. With Re-Sizefy, the whole conversion happens on your own device — drag your files in, get WebP files out, and nothing ever gets uploaded.

Step-by-step conversion

1. Open the tool and drop in your JPGs. Drag and drop one file or a whole folder into the drop zone. Batch conversion means 50 photos take barely longer than one.
2. Set WebP as the output format. Choose WebP from the output options so every file in the batch converts to it.
3. Pick a quality level. Start at quality 80 for photographs. Slide lower and watch the preview: at 70–75 most photos still look identical while the file shrinks noticeably. Portraits with smooth skin tones can often go lower than busy landscapes before artifacts appear.
4. Resize at the same time if you need to. If the image will be displayed at 1200px wide, downscale to 1200px first — downsizing plus format conversion together usually beats either one alone.
5. Download. A single file downloads directly; a batch arrives as one ZIP archive. Use the file renaming rules to add a suffix like -webp so originals and conversions never get mixed up.

Quality tips

Don't chase the smallest file blindly. Open the result at 100% zoom and check high-contrast edges — text overlays, hair against sky, sharp shadows — where compression artifacts appear first. If you spot blockiness or color banding in smooth gradients, bump the quality back up 5–10 points. For typical web photography, quality 75–85 is the sweet spot; below 60, most viewers can tell.

One conversion from the original JPG is all you want. Converting JPG → WebP → JPG → WebP again stacks compression losses each round, so always start from the highest-quality source you have and keep it as your master copy.

Things to watch out for

• Legacy support. WebP works in every modern browser, but if you must serve visitors on Internet Explorer 11 or very old Android WebViews, keep a JPG fallback. For the vast majority of sites this is no longer necessary.
• Open Graph images. Social cards (Facebook, LinkedIn, KakaoTalk previews) still prefer JPG or PNG for link thumbnails. Convert your body images to WebP, but keep the og:image as a JPG to be safe.
• Editing later. WebP is a delivery format, not an editing master. Keep your original JPGs archived; re-export from them whenever you need a different size.

Related guides

• PNG to WebP: shrinking logos and screenshots
• WebP vs JPG vs PNG: which format when