Add up to 30 images (up to 50 MB each) and the advisor checks each one for transparency, number of colors and flat areas, then test-encodes it as PNG, WebP, JPG and AVIF to compare real file sizes. Graphics get PNG; photos get whichever of AVIF, WebP or JPG came out smallest, with the reasons spelled out. One click converts every image to its recommended format, and everything happens in your browser.
Find the best image format and quality
The right format can make an image several times smaller without visible loss, but it depends on the image. This image format advisor looks at your actual file instead of giving generic rules, and recommends a format you can apply straight away.
How to use the Image Format Advisor
- Add your image or images. Any common format works, including PNG, JPG, WebP, AVIF and HEIC.
- Read the analysis: transparency, color count, how flat the image is, and the test sizes for each format.
- Convert the images to their recommended formats and download them.
What the advisor checks
It looks at a copy of the image scaled to at most 512 pixels. It checks whether the image has no transparency, hard-edged transparency or soft transparency, counts distinct colors up to 4,096, and measures how many neighboring pixels are identical. An image with 256 colors or fewer, or with large flat areas and limited colors, counts as a graphic and gets PNG, which keeps edges and text sharp.
For photos it encodes test versions as WebP and JPG at quality 80 and AVIF at quality 70 (JPG is skipped when the image has transparency) and picks the smallest. For very large images the AVIF size is estimated from a smaller copy and marked as an estimate. Each recommendation links to the matching converter.
Why use it
Smaller images help Core Web Vitals such as Largest Contentful Paint. The advisor avoids guesswork by measuring real encodes, and nothing is uploaded. It is free, with no sign-up and no watermark.
Developers use it to pick formats for hero images, marketers for campaign banners, store owners for product photos, and bloggers for images that need to stay sharp but small.
Formats it compares
AVIF usually gives the smallest photos and supports transparency, and current browsers display it. WebP compresses well, supports transparency and works in every current browser. JPG works everywhere but has no transparency. PNG is lossless, the right choice for logos, interface graphics and screenshots.
Tips for best results
For photos, AVIF or WebP at a quality of 70 to 85 is usually a good range. For logos and interface graphics, PNG or lossless WebP keeps edges sharp. If you need transparency, avoid JPG. When the default quality isn't right for you, set your own quality (10 to 100) before converting.
Frequently Asked Questions
Do you upload or store my images?
No. The analysis and the conversion both run in your browser.
What formats can I convert to?
AVIF, WebP, JPG and PNG. The advisor picks one for each image based on its content and the test encodes, and you can convert all of them in one step.
Will quality be degraded?
PNG recommendations are lossless. For photos, the conversion uses quality 70 for AVIF and 80 for WebP and JPG, which look very close to the original for most photos. You can override the quality from 10 to 100 if you want more detail or smaller files.
Is this free?
Yes. It's free, with no account, no watermark and no uploads.
Will this improve SEO?
Smaller images make pages load faster, which improves Largest Contentful Paint and the experience for visitors. Page experience is one of many signals search engines use, so it can help but won't fix rankings on its own.
Can I use it on mobile?
Yes. It runs in mobile browsers as well as on desktop.