Multi-Resolution Image Compressor
Compress images to multiple resolutions for responsive srcset use online for free. Our multi-resolution image compressor generates 320w, 640w, 1024w, and 1920w variants from a single upload — with a ready-to-use HTML srcset snippet for each image. Download all variants as a ZIP and paste the snippet directly into your HTML. No signup, no uploads, 100% private.
WebP is recommended for srcset — best compression at all sizes.
80–85% is ideal for responsive web images.
Breakpoints to Generate
Toggle which widths to include in the srcset.
| Width | Typical Viewport | Use Case |
|---|---|---|
| 320w | Small mobile (320px) | iPhone SE, small Android phones |
| 640w | Mobile (375–640px) | Standard smartphones, 2× retina mobile |
| 1024w | Tablet / small desktop | iPad, laptop screens, 2× retina tablet |
| 1920w | Full HD desktop | 1080p monitors, 2× retina desktop |
Why Use Our Multi-Resolution Image Compressor?
All srcset Breakpoints in One Pass
Generate 320w, 640w, 1024w, and 1920w variants from a single upload. Our multi-resolution image compressor produces all responsive image sizes simultaneously — no need to resize images one by one.
Ready-to-Use HTML srcset Snippet
Every processed image generates a complete HTML srcset snippet with correct sizes attributes — copy it directly into your HTML. The multi-resolution image compressor eliminates the manual work of writing srcset markup.
Secure Multi-Resolution Compressor Online
Your images never leave your device when you use this multi-resolution image compressor online. 100% client-side processing ensures complete privacy for personal and commercial images.
Multi-Resolution Compressor — No Installation
Generate responsive image variants directly in your browser. No software downloads, no plugins, no account required. Our free multi-resolution image compressor works on any device with a modern browser.
When to Use the Multi-Resolution Image Compressor
Responsive Web Design
Use the multi-resolution image compressor to generate all srcset breakpoints for hero images, banners, and content images. Browsers automatically download the most appropriate size, reducing bandwidth usage by up to 70% on mobile.
Core Web Vitals Optimisation
Properly sized images are one of the biggest factors in Largest Contentful Paint (LCP) scores. Use the multi-resolution image compressor online to generate correctly-sized variants that eliminate 'Properly size images' PageSpeed warnings.
WordPress and CMS Development
WordPress and other CMS platforms use srcset for responsive images. Use the multi-resolution image compressor to pre-generate all required sizes before uploading, giving you full control over compression quality.
E-Commerce Product Images
Product images need to look sharp on both mobile and desktop. The multi-resolution image compressor generates all srcset variants from a single product photo, ensuring fast loading at every screen size.
Static Site Generators
Developers using Gatsby, Next.js, Astro, or Hugo can use the multi-resolution image compressor online to pre-generate responsive image sets before build time, without relying on server-side image processing.
Photography Portfolio Sites
Photography portfolios need high-quality images at every screen size. Use the multi-resolution image compressor to generate 320w through 1920w variants that load fast on mobile while remaining sharp on retina displays.
Understanding Multi-Resolution Image Compression
What is Multi-Resolution Image Compression?
Multi-resolution image compression generates the same image at multiple widths — typically 320w, 640w, 1024w, and 1920w — so browsers can download the most appropriate size for the current viewport using the HTML srcset attribute. Without responsive images, a mobile user on a 375px screen downloads the same 1920px image as a desktop user — wasting bandwidth and slowing page loads. Our free multi-resolution image compressor generates all four breakpoint variants from a single upload, entirely in your browser, and produces a ready-to-use HTML srcset snippet for each image.
How Our Multi-Resolution Image Compressor Works
- Upload Your Images: Drag and drop or click to select up to 10 images of any format — JPEG, PNG, WebP, GIF, BMP, or TIFF. The multi-resolution image compressor accepts any resolution or file size as input.
- Configure and Generate:Choose output format (WebP recommended), quality level, and which breakpoints to include. Click "Generate srcset Variants" — the tool scales each image to each target width while preserving aspect ratio, then compresses at your chosen quality. All processing happens locally in your browser.
- Copy Snippet and Download: Each image expands to show all generated variants with dimensions and file sizes, plus a ready-to-use HTML srcset snippet. Copy the snippet directly into your HTML or download all variants as a ZIP archive (including the srcset snippet as a .html file).
What Gets Generated for Each Image
- 320w Variant: Scaled to 320px width — serves small mobile devices (iPhone SE, small Android phones). Typically 80–90% smaller than the full-size image.
- 640w Variant: Scaled to 640px width — serves standard smartphones and 2× retina mobile displays. Used as the default
srcfallback in the generated snippet. - 1024w Variant: Scaled to 1024px width — serves tablets, small laptops, and 2× retina tablet displays. Balances quality and file size for mid-range viewports.
- 1920w Variant: Scaled to 1920px width — serves full HD desktop monitors and 2× retina desktop displays. The largest variant, used only when the viewport requires it.
Understanding the Generated srcset Snippet
The generated HTML snippet uses the srcset attribute with width descriptors (320w, 640w, etc.) and a sizes attribute that tells the browser which image to download at each viewport width. The loading="lazy" and decoding="async" attributes are included by default for optimal performance. Adjust the sizes attribute if your layout uses a different column width at each breakpoint.
Related Tools
PNG to RAW
Convert PNG images to RAW format instantly - Free online PNG to RAW converter
JPG to RAW
Convert JPG/JPEG images to RAW format with customizable bit depth - Free online JPG to RAW converter
BMP to RAW
Convert BMP images to RAW format instantly - Free online BMP to RAW converter
GIF to RAW
Convert GIF images to RAW format instantly - Free online GIF to RAW converter
Frequently Asked Questions About Multi-Resolution Image Compressor
A multi-resolution image compressor generates the same image at multiple widths (320w, 640w, 1024w, 1920w) so browsers can download the most appropriate size for the current viewport using the HTML srcset attribute. Our free tool generates all breakpoint variants from a single upload, entirely in your browser, and produces a ready-to-use HTML srcset snippet.
The srcset attribute tells browsers which image to download based on the viewport width. Without srcset, a mobile user on a 375px screen downloads the same 1920px image as a desktop user — wasting bandwidth and slowing page loads. With srcset, browsers automatically download the smallest image that looks sharp at the current screen size.
Absolutely. Our multi-resolution image compressor online processes all images entirely within your browser using the HTML5 Canvas API. Your images are never uploaded to any server, never stored remotely, and never transmitted over the network.
Yes, 100% free. No signup, no subscription, no premium tier, and no file size limits on input images. Our multi-resolution image compressor online is free forever.
No. The multi-resolution image compressor never upscales images. If the original image is smaller than a requested breakpoint width, the tool outputs the image at its original width rather than enlarging it. The generated srcset snippet uses the actual output dimensions.
Copy the generated HTML snippet and paste it into your HTML where you want the responsive image. Adjust the alt attribute to describe the image. The sizes attribute in the snippet assumes full-width images — if your layout uses a different column width, update the sizes values to match your CSS breakpoints.
WebP is recommended for srcset — it produces the smallest files at each breakpoint and is supported by all modern browsers. Use JPEG for maximum compatibility with older browsers. Use PNG only when you need lossless compression with transparency at all sizes.
Yes. Upload up to 10 images and click "Generate srcset Variants" to process the entire queue. Each image generates all selected breakpoint variants independently. Download all variants from all images as a single ZIP archive (including srcset snippets as .html files).
80–85% quality delivers an excellent balance between visual sharpness and file size for responsive web images. Smaller breakpoints (320w, 640w) are displayed at smaller sizes, so compression artefacts are less visible — you can use slightly lower quality for these sizes if needed.