将 JPG 转换为 WebP
将 JPEG 图像转换为现代 WebP 格式，无可见质量损失地将文件大小减少最多 30%。免费、私密、无需上传。
私密且安全
文件永远不会离开您的设备。所有处理均在浏览器本地完成。
完全免费
无需订阅，无水印，无文件限制。永远免费。
批量转换
一次转换数十个文件，并单独追踪每个文件的进度。
闪电般快速
由您设备的硬件提供支持，无需服务器往返。
什么是将 JPG 转换为 WebP？
Our free JPG to WebP converter transforms your JPEG images into Google's modern WebP format, delivering up to 30% smaller file sizes with no visible quality loss. All processing happens locally in your browser — no uploads, complete privacy.
WebP was developed by Google specifically to make the web faster. By using more advanced compression algorithms than JPEG, WebP can deliver the same visual quality at a significantly smaller file size. For websites and web apps, switching from JPEG to WebP is one of the most impactful performance optimizations available — Google's Lighthouse and PageSpeed Insights tools specifically flag non-WebP images as an optimization opportunity.
Converting your existing JPEG image library to WebP is now faster than ever with our batch conversion support. Process dozens of images at once and download them all with a single click.
如何计算
- Drag your JPG or JPEG files onto the converter area, or click to browse and select files.
- The converter reads your images locally using the browser's FileReader API.
- Click "Convert" — each image is rendered to an HTML canvas and exported as 90% quality WebP.
- Download each WebP file individually, or click "Download All" to batch-download everything.
- Replace your original JPG files with the WebP versions to improve website load times.
主要优势
- Up to 30% smaller file sizes than equivalent JPEG — faster loading websites and apps
- Maintained quality at 90% WebP compression — visually identical to high-quality JPEG
- Improves Google PageSpeed and Core Web Vitals scores — better SEO and user experience
- Complete privacy — your images never leave your device or browser
- Batch convert entire image libraries simultaneously for free
- Free forever with no watermarks, file size limits, or subscriptions
常见用例
- Web developers optimizing image-heavy websites for faster load times and better SEO
- E-commerce sites reducing product image file sizes to improve mobile page speed
- Bloggers and content creators converting article images to WebP for faster loading
- Web designers preparing image assets for modern, performance-focused websites
- App developers reducing app bundle size by converting image assets to WebP
关键术语解释
- WebP
- Google's image format using advanced compression to achieve 25–34% smaller files than JPEG at equivalent quality
- Core Web Vitals
- Google's metrics for measuring web page user experience — image format affects LCP (Largest Contentful Paint)
- LCP (Largest Contentful Paint)
- A Core Web Vital that measures how long the largest visible image takes to load — smaller WebP files improve this score
- Compression ratio
- The ratio between original and compressed file sizes — WebP typically achieves ratios of 1.3:1 compared to JPEG
- next/image
- Next.js's image optimization component that automatically serves WebP to supported browsers
专业提示
- Use <picture> element in HTML to serve WebP to modern browsers with JPEG as fallback for old ones
- Next.js, Nuxt, and SvelteKit all have built-in image optimization that automatically converts to WebP
- For maximum compression, convert to WebP AND resize to the exact display dimensions — avoid loading 2000px images to display at 400px
- WebP's size advantage is most significant for photographic content — for simple graphics, the difference may be smaller
- Test your converted WebP in Safari if targeting iOS users — Safari 14 added WebP support but older iPhones still running iOS 13 don't support it
About the WebP Format
WebP was developed by Google and publicly released in 2010. It uses a prediction-based lossy compression codec derived from VP8 video coding, which is significantly more efficient than JPEG's DCT-based compression. WebP typically produces images 25–34% smaller than JPEG at equivalent quality. It also supports lossless compression, transparency (alpha channel), and animation — making it a comprehensive replacement for both JPEG and PNG. All major browsers have supported WebP since 2021: Chrome (2011), Firefox (2019), Edge (2018), and Safari (2020 on macOS, 2021 on iOS). WebP is recommended by Google Lighthouse, the web performance standard, as the preferred format for web images. It is also supported by modern image editing tools including Photoshop (2022+), GIMP, Sketch, and Figma.
常见问题
How much smaller will my images be after converting to WebP?↓
Typically 25–35% smaller than the equivalent JPEG at the same visual quality. Google's research shows WebP achieves 25–34% smaller files than JPEG.
Will my images look different in WebP?↓
No. We convert at 90% WebP quality, which produces results visually identical to high-quality JPEG. The only difference is the smaller file size.
Do all browsers support WebP?↓
Yes — all modern browsers (Chrome, Firefox, Safari 14+, Edge, Opera) support WebP natively. Global WebP browser support exceeds 97% as of 2024. Only very old browsers like IE11 don't support it.
Are my images kept private?↓
Yes. All conversion happens locally in your browser — your JPEG files are never uploaded to any server.
Can I batch convert multiple JPG files?↓
Yes. Drag in as many JPG/JPEG files as you need. All will be converted simultaneously, each with its own download button.
Should I use JPG to WebP for my website?↓
Absolutely. Google's Lighthouse performance audit specifically recommends converting JPEG and PNG images to WebP. Smaller images mean faster page loads and better Core Web Vitals scores.