Heavy images are one of the most common reasons a page loads slowly, and switching to WebP is one of the easiest ways to fix it. The converter above turns JPG, PNG, GIF and other images into WebP right in your browser. Your images are never uploaded. Below, you will learn how to use it, what each setting does, which settings work best, and the WebP basics you need to know.
Table of Contents
How to Use the Image to WebP Converter
- Add your images. Drag and drop them, click the upload box to choose files, or paste an image with Ctrl + V. You can add up to 50 images at a time.
- Choose the quality. The default is 80. Use the presets (60, 80 or 90) if you want a quick start.
- Set a max width (optional). If your blog content area is 800 px wide, a 4000 px image only wastes bytes.
- Check the results. Each row shows the old size, the new size, the percentage saved and the final dimensions.
- Download. Save images one by one, or click Download All (ZIP).
When you change the quality or max width, the tool converts your images again automatically.
Tool Options Explained
| Option | What it does | Good to know |
|---|---|---|
| Quality (1 to 100) | Sets the WebP encoder quality. Lower values make smaller files but remove more detail. | 75 to 85 works well for most photos. |
| Max width (px) | Scales large images down and keeps the aspect ratio. | Images are never enlarged. WebP also has a maximum side length of 16,383 px. |
| Result rows | Show before and after size, savings and dimensions. | If a file gets larger, the row says so. Lower the quality or keep the original. |
| Download All (ZIP) | Puts every converted image into one ZIP file. | Files with the same name get a number added. |
Best Settings for Each Image Type
| Image type | Suggested quality | Tip |
|---|---|---|
| Photos and featured images | 75 to 85 | Compare the result with the original at full size, then step the quality down until you notice a difference. |
| Screenshots with text or code | 90 or higher | Text edges are the first place compression shows. Check them before you publish. |
| Transparent PNGs (logos, cutouts) | 80 to 90 | WebP supports transparency. Check the edges of the result. |
| Images that are already small | 75 to 80 | A well-optimized JPG or PNG may not shrink much. |
Always convert from your original file, not from an image that was already compressed. Every lossy save removes a little more detail.
What Is WebP?
WebP is an image format created by Google for the web. It supports lossy and lossless compression, transparent backgrounds and animation. According to Google's WebP documentation, lossless WebP images are 26% smaller than PNG, and lossy WebP images are 25 to 34% smaller than comparable JPEG images. These are averages, so results vary from image to image.
Browser support is no longer a worry. Can I use shows WebP working for about 97% of global traffic. AVIF can compress even better, but WebP is still the safer default for most blogs. We compare the two in AVIF vs WebP: Is AVIF Ready for Everyday Use?
Why WebP Matters for Speed and SEO
On many pages, the largest visible element is an image. That makes image weight a big part of Largest Contentful Paint (LCP), one of the Core Web Vitals. Google considers an LCP of 2.5 seconds or less good (see web.dev's LCP guide). A smaller file only shortens the download part of LCP, but for image-heavy pages that part is often the biggest one.
PageSpeed Insights also flags this. Older reports show the warning "Serve images in next-gen formats", and newer Lighthouse versions fold it into a broader "Improve image delivery" insight. Our guide on how to fix the next-gen formats warning covers the full process.
To get the most from your WebP images:
- Add
widthandheightattributes so the browser can reserve space and avoid layout shifts. - Do not lazy-load your featured (LCP) image. Use
loading="lazy"only for images below the fold. - Resize images to the size you actually display before you upload them.
- Write useful alt text for every image.
Limitations to Know
- Safari and iPhone browsers cannot create WebP files this way. They can display WebP, but they cannot encode it from a canvas. The tool detects this and shows a message instead of giving you a wrong file. Use Chrome, Edge or Firefox.
- Animated GIFs keep only the first frame. Use a video format or an animated WebP made with another tool.
- Metadata is not carried over. Information such as EXIF camera data is not copied into the new file.
- Some formats cannot be opened. If your browser cannot read a file type (HEIC, for example, in most browsers), the tool shows an error for that file.
- Batch limits. The tool accepts up to 50 images at a time, and each side can be at most 16,383 px.
Frequently Asked Questions
Is the Image to WebP Converter free, and are my images uploaded?
It is free and needs no signup. The conversion runs in your browser, so your images stay on your device and are not uploaded to a server.
Why is my WebP file bigger than the original?
This can happen with images that were already heavily optimized or very simple. Try a lower quality, set a max width, or keep the original file. The savings from WebP are averages, not a guarantee.
Does converting to WebP reduce image quality?
Yes, a little, because the tool uses lossy compression. You control how much with the quality slider. For photos, quality 75 to 85 is usually hard to tell apart from the original at normal viewing size.
Does the converter work on iPhone or Safari?
Not for creating WebP files. Safari can show WebP images, but it cannot encode them in the browser, so the tool displays a message. Open the page in Chrome, Edge or Firefox on a computer or Android phone.
Will WebP images work for all my visitors?
For almost all of them. WebP works for about 97% of global traffic. Internet Explorer 11 never supported it. If you want a safety net, the HTML <picture> element can offer WebP first and a PNG or JPEG fallback.
Will WebP improve my Google ranking?
Only indirectly. Lighter images can improve page speed and LCP, which are part of Core Web Vitals, but relevant content still matters most. See our WebP vs PNG guide for more detail.
Final Thoughts
Converting your images to WebP takes only a few seconds, and it is one of the simplest ways to make a page lighter. Start with quality 80, compare the result with your original, and adjust from there. Keep your original files safe, and upload the WebP copies to your site.