WebP is already the most efficient mainstream image format for web use, but the WebP files that come out of design tools and camera exports are often still larger than they need to be for specific targets like email attachments, CMS upload limits, or strict page-weight budgets.
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WebP was developed by Google and released in 2010, based on the intra-frame encoding of the VP8 video codec. For lossy compression, which is the mode comparable to JPEG, WebP uses an adaptive block quantization scheme and a more sophisticated prediction algorithm than JPEG's discrete cosine transform alone. The result is that WebP at 80 percent quality achieves approximately the same perceptual quality as JPEG at 88 to 90 percent quality while producing a file 25 to 34 percent smaller. In concrete terms, a JPEG at 85 percent quality that weighs 400 kilobytes is approximately equivalent in visual quality to a WebP at 80 percent quality weighing 270 to 300 kilobytes. Google's own WebP study, comparing 900,000 images at matched SSIM quality scores, found an average 30 percent size reduction versus JPEG. This advantage is consistent across photographic content including landscapes, portraits, and product shots, and slightly smaller for synthetic content like illustrations and screenshots.
WebP also supports a lossless mode, built on the LZ77 algorithm combined with prefix coding, which is distinct from and more efficient than PNG's deflate algorithm. Lossless WebP achieves approximately 26 percent smaller files than equivalent PNG for the same pixel content, with zero pixel difference. A 200 kilobyte PNG logo stored as lossless WebP occupies approximately 148 kilobytes with no quality change at all. WebP lossless also supports full alpha channel transparency, making it a true drop-in replacement for PNG in every use that requires transparency. The format further supports a mixed mode where the base image uses lossy compression and the alpha channel uses lossless, which is a particularly useful mode for product photographs with transparent backgrounds that need small file sizes for fast loading.
Browser support for WebP is now comprehensive enough that fallbacks are rarely needed. Chrome has supported WebP since 2011. Firefox added support in 2019. Safari added WebP support in version 14, released with iOS 14 and macOS 11 Big Sur in September 2020. As of 2024, WebP is supported by over 97 percent of browsers in active use globally, with the remaining three percent consisting almost entirely of legacy Internet Explorer 11, which Microsoft itself stopped supporting in June 2022, and very old Safari versions on iPhones that have not been updated in years. For any web project targeting current users, WebP can be used as the default format without fallback. The web.dev image best practices guide explicitly recommends WebP as the primary format for all photographic web content.
The decision matrix for choosing WebP quality is straightforward once you understand the format's position relative to JPEG. For hero images and full-width photographic content, 80 percent is the recommended starting point because it matches the perceptual quality of JPEG 88 to 90 percent at much smaller file sizes. For thumbnails and small product images, 78 percent is enough because small display sizes hide minor artifacts. For graphics with text overlays, infographics, and screenshots, 85 to 88 percent preserves text legibility better and the file size cost is modest. For images destined for further processing, such as design assets that will be edited downstream, lossless WebP is the right choice because it preserves every pixel for the next stage.
Step-by-step guide to compress webp online:
Upload your WebP file
Open Image Compressor and upload your .webp image file by dragging it into the upload area or selecting it from your file picker. The tool recognizes WebP variants including lossy, lossless, and animated WebP, though animated WebP compression is treated as a single-frame operation.
Set the quality level
Start at 80 percent. WebP at 80 percent is typically equivalent in perceptual quality to JPEG at 90 percent but produces a much smaller file. If you need to hit a specific size target, drop toward 70 percent and watch the live size readout adjust as you move the slider.
Preview the compression
Check the output file size displayed alongside the visual preview. Look for any artifacts in smooth gradient areas or around small text, which are the regions most likely to show degradation if the quality dropped too far for your particular image content.
Download the compressed WebP
Download the compressed WebP file, ready for use on web or mobile. The output stays in WebP format with the alpha channel preserved if your input had one, so it drops directly into your existing WebP-aware infrastructure without any conversion friction.
A/B test against the source
For hero images or other high-visibility uses, view the original and compressed versions back to back in your actual deployment context such as your site preview or staging environment. The browser rendering on real backgrounds reveals issues a preview pane cannot.
Common situations where this approach makes a real difference:
Front-end developer
A developer audits a retail site and finds 200 product images stored as JPEG averaging 350 kilobytes each. Converting them all to WebP at 80 percent quality reduces the average to 235 kilobytes, a 33 percent reduction. Total product gallery page weight drops from 3.5 megabytes for a 10-image page down to 2.35 megabytes. Google PageSpeed Insights LCP score improves from 2.8 seconds to 1.9 seconds on mobile, which crosses the threshold from "needs improvement" to "good" in the Core Web Vitals report and removes a sustained SEO penalty.
CMS administrator
A WordPress site administrator uses WebP output from a media optimization plugin, but the WebP files exported from Canva-designed assets are 800 kilobytes to 1.2 megabytes each because Canva exports at high quality by default. After compressing all 40 WebP assets to 78 percent quality in FixTools, each drops to between 280 and 450 kilobytes. The site's total homepage weight falls from 8.4 megabytes to 4.1 megabytes, cutting Time to Interactive from 6.2 seconds to 3.1 seconds on the same test connection.
Mobile app developer
An Android developer bundles 60 image assets as WebP in an app. The designer exported all assets at quality 95, producing files of 150 to 400 kilobytes each. After re-compressing at 82 percent quality, assets average 95 kilobytes. App download size falls from 22 megabytes to 14 megabytes, moving below the 15 megabyte threshold for Android's automatic cellular download permission and significantly increasing the percentage of users who complete installs on mobile data without manual intervention.
Newsletter designer
An email marketing designer exports HTML email background images as WebP for the Outlook 365 and Gmail web client recipients who can render them. Images compressed to 78 percent quality and 600 pixels wide average 48 kilobytes each, comfortably under the 80 kilobyte per image target that keeps the total email below Gmail's 102 kilobyte clip threshold. The newsletter renders without the "view entire message" truncation across all tested clients, which historically reduced click-through rates by hiding the call-to-action below the fold.
Get better results with these expert suggestions:
Use WebP at 80 percent for the best quality-to-size ratio
WebP at 80 percent quality is the standard recommendation from Google's web.dev image optimization guide. It achieves perceptual quality equivalent to JPEG at 88 to 90 percent while producing files 25 to 34 percent smaller. For the vast majority of web images, 80 percent WebP is the optimal setting because files are small enough for fast loading but retain enough detail that further compression to 70 to 75 percent starts to show visible artifacts in challenging content like skin tones and sky gradients.
Use lossless WebP for logos and images with transparency
For logos, icons, and interface elements that require transparency, choose lossless WebP mode rather than lossy. Lossless WebP stores every pixel exactly like PNG but in 26 percent fewer bytes with no quality difference. Use the Format Converter to convert your PNG logos to WebP lossless. The output looks identical to the original PNG but loads faster, and it inherits all the WebP-format advantages including better cache hit rates from modern CDN configurations tuned for WebP.
Serve WebP with a JPEG fallback for legacy compatibility
In HTML, use the picture element with a WebP source and a JPEG fallback: browsers that support WebP load the smaller WebP automatically; others load the JPEG. This provides full compatibility without serving larger JPEGs to the 97 percent of users whose browsers handle WebP just fine. Modern static site generators and CDNs handle the fallback markup automatically, so you only have to author the WebP asset and the system does the rest.
Re-compress WebP assets from design tools at lower quality
Design tools like Figma, Canva, and Adobe XD export WebP at high quality of 85 to 95 percent by default, because their developers prioritize quality over file size. These exports are larger than necessary for web display. Re-compressing at 78 to 82 percent in FixTools reduces typical design tool exports by 30 to 45 percent without any visible change on screen. This is especially impactful for landing pages with multiple full-width images that compound the weight problem.
More use-case guides for the same tool:
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