What is a WebP file?
Learn how WebP delivers smaller image sizes with lossy or lossless compression, transparency, and animation across modern browsers and operating systems. Free WebP converters included.
Google introduced the WebP image format in 2010 to accelerate page loading across the internet by reducing graphic file sizes without sacrificing visual clarity. Before WebP arrived, web developers had to juggle separate formats for specific tasks: standard lossy files for rich photographs, lossless formats for graphics requiring sharp edges and transparency, and animated bitmap formats for moving clips. WebP solves this fragmentation by offering a single container that handles lossy photographic compression, lossless graphics, alpha channel transparency, and multi-frame animation while keeping file payloads remarkably small.
Technically, WebP is based on the VP8 video codec keyframe prediction for lossy encoding and uses advanced spatial transformation techniques with entropy coding for lossless data. It stores visual data inside a lightweight Resource Interchange File Format container. In lossy mode, WebP uses predictive coding to analyze neighboring pixel blocks, yielding files twenty-five to thirty-four percent smaller than standard JPEG images. Lossless WebP operates in twenty-four-bit color with an optional eight-bit alpha channel, beating PNG sizes by about twenty-six percent. It seamlessly supports transparency even alongside lossy compression, which traditional photo formats cannot achieve.
Today you encounter WebP across virtually every modern website, content delivery network, and mobile platform. Full native support is built into Google Chrome since version 23, Mozilla Firefox since version 65, Apple Safari since version 14, and Microsoft Edge since version 18. Both Windows 10 and macOS Big Sur or newer include native system-level decoding to preview WebP files in file explorers and standard photo viewers. Whether you browse social media, download digital assets, or build web applications, WebP serves as the standard workhorse for rapid web asset delivery across desktop and mobile operating systems alike.
Technical specification
| Extension | .webp |
|---|---|
| MIME type | image/webp |
| Compression | Both lossy and lossless |
| Transparency | Yes (even in lossy mode) |
| Animation | Yes |
| Typical file size | 25-34% smaller than JPG and about 26% smaller than PNG at equal quality |
| Browser and system support | Chrome 23+, Firefox 65+, Safari 14+, Edge 18+; native on Windows 10 and macOS Big Sur |
| Developed by / year | Google, 2010 |
When to use it
- Choose WebP when you want to speed up website loading times by reducing photograph sizes by up to 34 percent compared to JPG.
- Choose WebP when you need transparent product images or UI graphics that require smaller payloads than standard PNG files.
- Choose WebP when you want lightweight animated web banners without the heavy 256-color restriction and bloated file size of GIF.
- Choose WebP when serving dynamic visual assets to modern web browsers and mobile applications across bandwidth-constrained networks.
When not to use it
- Avoid WebP when preparing high-resolution assets for professional physical printing and use TIFF or CMYK-ready PDF instead.
- Avoid WebP when you require lossless editing workflows with 16-bit color depth or RAW camera data and choose TIFF or native RAW instead.
- Avoid WebP when targeting legacy desktop software or operating systems released before 2018 and stick with standard JPG or PNG instead.
Our tools for this format
40 tools that take WebP files in or write them out. Each one runs in your browser, so nothing is uploaded.
Convert to this format
Convert from this format
Edit files in this format
- WebP Converter
- Bulk Image Resizer
- Image Compressor
- Square Image Maker
- Favicon Generator
- WebP Compressor
- AVIF Compressor
- EXIF Data Viewer
- EXIF Data Remover
- Image to Data URI
- Photo Collage Maker
- Image Compare Tool
- Passport Photo Maker
- HEX RGB Color Converter
- Image Cropper
- Rotate Image
- Invert Image Colors
- Pixelate Image
- Round Image Corners
- Watermark Image
Common problems
Your desktop graphic editor displays an error stating the file format is unsupported when opening a downloaded WebP file.
Older image editing software lacks native decoding libraries for WebP containers. You can install an official WebP codec plugin for your application or convert the image to PNG or JPG locally in your browser before opening it. Converting takes only a few seconds and preserves full image fidelity.
A website upload form rejects your WebP image and demands a standard JPG or PNG file.
Many legacy content management systems and strict web forms only accept traditional image extensions. Use a browser-based conversion tool to convert your WebP file into JPG for photos or PNG for transparent graphics. The resulting file will upload without triggering validation errors.
WebP images appear sharp on modern web browsers but fail to render for visitors using legacy browsers.
Legacy browsers like Internet Explorer do not support the WebP decoding specification. You should implement the HTML picture element on your web server to deliver WebP to modern clients while providing a fallback JPG or PNG for older systems. This approach guarantees full backward compatibility without sacrificing speed.
Animated WebP files do not play motion sequences when viewed in older default operating system media viewers.
Older operating systems only support single-frame static previews and cannot parse multi-frame animated WebP chunks. You can open the animated file directly inside any modern web browser to view the full sequence. Alternatively, convert the file into an animated GIF or MP4 video for universal offline playback.
Frequently asked questions
How much smaller is WebP compared to JPG and PNG?
WebP lossy images are typically 25 to 34 percent smaller than comparable JPG files at equivalent visual quality. Lossless WebP images average 26 percent smaller than standard PNG files while maintaining identical pixel precision.
Does WebP support transparent backgrounds?
Yes, WebP supports full 8-bit alpha channel transparency in both lossless and lossy compression modes. This allows you to create transparent photographic graphics that use up to 60 percent less bandwidth than traditional 24-bit PNG files.
Can WebP images be animated like GIFs?
Yes, WebP supports 24-bit color animation with alpha channel transparency. Animated WebP files frequently reduce file size by 50 to 80 percent compared to legacy 8-bit GIF animations.
Which web browsers natively support the WebP format?
WebP is natively supported in Google Chrome version 23 and newer, Mozilla Firefox version 65 and newer, Apple Safari version 14 and newer, and Microsoft Edge version 18 and newer. This covers over 97 percent of global desktop and mobile browser traffic today.
Is WebP suitable for professional photo printing?
No, WebP is optimized exclusively for 8-bit RGB web display and does not support CMYK print color profiles or 16-bit color depths. For physical printing, you should convert or export your images to 300 DPI TIFF or high-quality PDF formats.