Image Compressor & WebP Converter Tool Online
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Compress JPG and PNG files, convert images to WebP, and resize oversized assets before upload. This private browser tool helps improve Core Web Vitals without sending images to a server.
Privacy note: nothing is uploaded. Canvas compression happens locally.
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How the Image Compressor Works
This online image compressor uses native browser features to optimize files before they reach your CMS, Astro project, or media library.
- Add images, drag and drop JPG or PNG files or select multiple images from your device.
- Choose output settings, select WebP, JPEG, or AVIF when supported, then adjust quality and optional max width.
- Process with canvas, each image is decoded, drawn to canvas, resized if needed, and re-encoded with canvas.toBlob.
- Compare savings, review original size, compressed size, percent saved, dimensions, and a preview.
- Download optimized files, save the compressed images and use them in your website workflow.
Why Image Compression Matters for Core Web Vitals
Images are often the largest assets on a business website. Reducing image weight can improve loading speed, user experience, crawl efficiency, and conversion rate.
- Faster LCP, optimized hero and content images can reduce the time needed to render the largest visible element.
- Lower bandwidth, smaller files help mobile visitors and reduce hosting transfer costs.
- Better SEO foundations, fast pages give search engines and AI crawlers cleaner access to content.
- Better publishing workflow, compressing before upload prevents massive original files from slowing the site later.
For a full performance workflow, pair this compressor with our Image SEO Checker and Core Web Vitals guide.
Image Format Reference
Choose the format based on the image type, required browser support, and publishing workflow.
| Format | Best use | Browser support note |
|---|---|---|
| WebP | Most website photos, product images, and blog graphics | Broad modern browser support and strong compression. |
| JPEG | Maximum compatibility for photos without transparency | Universal support, but larger than WebP at similar quality. |
| PNG | Logos, UI assets, screenshots, and transparent graphics | Lossless and widely supported, but can be large for photos. |
| AVIF | Modern high-compression image delivery | Excellent compression, but canvas export support varies by browser. |
Compression Best Practices
- Resize huge camera photos before adding them to the website.
- Use WebP for content images and keep PNG for logos or graphics that need crisp transparency.
- Keep width and height attributes in HTML to prevent layout shift.
- Use descriptive filenames and alt text after compression so image SEO is not lost.
- For Astro projects, store content images in
src/assets/and use the Astro Image component for final build optimization.
Image Format Reference
Picking the right format is the first speed win. Match the format to the content, then compress. For a complete image pipeline across your site, see our website speed and performance optimization service.
| Format | Best for | Notes and typical savings |
|---|---|---|
| JPEG | Photographs and complex images without transparency | Universal support; larger than WebP and AVIF at similar quality. |
| PNG | Transparency, flat graphics, logos, and screenshots | Lossless and crisp, but heavy for photos; prefer for flat or transparent art. |
| WebP | Modern all-round choice for most website images | Broad support; typically around 25 to 35 percent smaller than JPEG at similar quality. |
| AVIF | Maximum compression for modern browsers | Best compression of the common web formats; provide a fallback for older browsers. |
| SVG | Vector graphics: logos, icons, and simple illustrations | Scales without quality loss and is usually tiny; not for photos. |
Savings figures are typical ranges and vary with image content, dimensions, and quality settings. A reliable order of preference for photos is AVIF, then WebP, then JPEG, with PNG reserved for flat or transparent graphics and SVG for vectors.
Next steps
Image Compressor related tools and articles
Continue with the closest follow-up checks and guides based on this tool's topic, crawl intent, and optimization workflow.
Image Compressor: FAQ
Which source files can this compressor process?
How does Max width change the image?
What does the quality setting control?
Why is AVIF unavailable in the format list?
What does the saved percentage mean?
What happens to PNG transparency when I choose JPEG?
Are metadata and animation preserved?
Are selected images uploaded to Web Aloha?
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