Image to WebP
Upload any image and convert it to WebP format with adjustable quality. WebP delivers 25–35% smaller files than JPEG at the same quality.
Reviewed by the ToolNestr Editorial Team — July 2026
How WebP conversion works
WebP conversion uses VP8 or VP8L (lossless) intra-frame encoding derived from the WebM video codec. For lossy compression, it employs block-based predictive coding that analyzes neighboring pixels to predict values, then encodes only the differences. This approach is more efficient than JPEG's independent block processing, resulting in smaller files at equivalent quality.
WebP supports both lossy and lossless modes along with alpha transparency and animation. The quality slider controls lossy compression — higher values preserve more detail while lower values achieve greater size reduction. Lossless WebP uses a different compression path that preserves every pixel exactly.
Worked example
File size comparison by format
Average file sizes relative to the original JPEG file at similar quality.
Marcus Chen
Web developer who converts all site images to WebP to slash page weight and improve Lighthouse performance scores for client projects.
Priya Sharma
Site speed optimizer who runs WebP conversion on e-commerce product images to reduce load times and increase conversion rates.
Jake Thompson
Blogger who converts high-res travel photos to WebP to keep his WordPress site fast without sacrificing image quality for readers.
Lisa Park
WordPress user who uses WebP via plugins and needs to batch-convert media library images for a faster, better-ranked site.
| Format | Browser support | Transparency | Animation |
|---|---|---|---|
| WebP | ~97% | Yes | Yes |
| AVIF | ~85% | Yes | Yes |
| JPEG | 100% | No | No |
| PNG | 100% | Yes | No |
| GIF | 100% | Yes (binary) | Yes |
How to convert an image to WebP
Upload your image
Click the file input and select any image from your device. JPG, PNG, AVIF, GIF and BMP are all supported.
Adjust quality
Use the slider to control compression. Higher quality means larger files. The preview updates in real time so you can compare.
Download WebP
Click the download button to save your WebP file. Your original image never leaves your device.
Tips for using WebP
WebP supports transparency like PNG
Unlike JPEG, WebP handles alpha channels natively. You can replace PNG images with WebP for transparent assets and save 25\u201330% file size.
Use WebP for web only
WebP is optimised for web delivery. For print, archiving, or editing, stick with JPEG or PNG as your master copy and convert to WebP only for the final web output.
Always check browser support
While 97% of browsers support WebP, always use the
What is WebP?
WebP is a modern image format developed by Google that provides superior compression for images on the web. It was first announced in 2010 and has since gained broad industry support. WebP supports both lossy and lossless compression, as well as transparency and animation, making it a versatile replacement for JPEG, PNG, and GIF in many web contexts.
Why is WebP smaller?
WebP achieves smaller file sizes through predictive coding. For lossy compression, it uses block prediction similar to VP8 video codec to encode image data more efficiently than JPEG\u2019s discrete cosine transform. For lossless compression, it uses advanced techniques like spatial prediction, color cache, and entropy coding to outperform PNG by 25\u201330%.
Transparency support
WebP supports alpha transparency channels with both lossy and lossless compression. This means you can use WebP for logos, icons, and other transparent assets that previously required PNG, while benefiting from significantly smaller file sizes. Lossless WebP with transparency is typically 20\u201330% smaller than PNG.
Lossy vs lossless WebP
Lossy WebP discards some visual information to achieve much smaller file sizes, ideal for photographs and complex images where minor quality loss is acceptable. Lossless WebP preserves every pixel exactly, making it suitable for graphics, screenshots, and images where quality must be maintained precisely. The quality slider in this tool controls lossy compression only.
Browser compatibility
WebP is supported by approximately 97% of web browsers globally. Chrome has supported it since 2011, Firefox since 2013, Edge since 2018, and Safari since version 14 (2020). For the remaining 3% of users on older browsers, use the
Frequently asked questions
What is WebP?
WebP is an image format developed by Google that provides superior lossy and lossless compression. It supports transparency like PNG and animation like GIF, all in a single format with smaller file sizes.
Is WebP better than JPEG?
For most web images, yes. WebP typically delivers 25–35% smaller files than JPEG at the same visual quality, which means faster page loads and less bandwidth usage.
Does WebP support transparency?
Yes. WebP supports alpha transparency (like PNG) but with significantly smaller file sizes, making it an excellent choice for logos and icons on the web.
What is the difference between lossy and lossless WebP?
Lossy WebP uses predictive coding to compress images with some quality loss (similar to JPEG). Lossless WebP preserves every pixel exactly (like PNG) but achieves smaller file sizes than PNG.
Which browsers support WebP?
WebP is supported by approximately 97% of browsers globally, including Chrome, Firefox, Safari (14+), Edge, and Opera. Only very old browsers lack support.
Can I use WebP for animation?
Yes. WebP supports animated images, functioning as a modern replacement for animated GIFs with much smaller file sizes and better color support.
How do I use WebP on my website?
Use the <picture> element with WebP as the primary source and a fallback format like JPEG or PNG for older browsers. Most CMS platforms also have WebP plugins.
Does WebP work for all types of images?
WebP works best for photographs and complex images. For simple graphics with few colors, PNG may sometimes produce smaller files, though lossless WebP is usually competitive.
Will I lose quality converting to WebP?
Lossy conversion reduces file size by discarding some visual information. The quality slider lets you control this tradeoff. At quality 80–90, the difference is barely noticeable but file sizes drop significantly.
How do I convert WebP back to JPG or PNG?
You can use this tool’s reverse conversion or any image editor. However, once converted to lossy WebP, the discarded data cannot be recovered, so keep your original files.