Free Online Image Resizer & Compressor
Resize and compress images in your browser — JPEG, PNG, WebP
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About this tool
Resize and compress images directly in your browser with this free online image resizer. Drag and drop any JPEG, PNG, WebP, or GIF file to see the original preview and file size, then set your target dimensions and quality. Lock the aspect ratio to resize proportionally by entering just one dimension, or unlock it to set width and height independently. A quality slider from 1 to 100 percent lets you balance file size against visual fidelity — 80% quality typically reduces a JPEG by 60-70% with no visible degradation. Export to JPEG for photos, PNG for graphics with transparency, or WebP for the best compression ratio on the web. After processing, a side-by-side comparison shows the original and compressed file sizes with the percentage reduction, and a download button saves the result instantly. Powered by the browser-image-compression library. No uploads to any server — your images stay private on your device.
Frequently Asked Questions
The input accepts JPEG, PNG, WebP, and GIF files (any file the browser's Image element can decode). Output formats are JPEG, PNG, and WebP. GIF input is rasterized to a single frame on output. For the best compression ratio on the web, choose WebP output — it typically achieves 25-35% smaller file sizes than JPEG at equivalent quality, and is supported by all modern browsers.
For JPEG and WebP, a quality of 75-85% is the sweet spot for most photos — the size reduction is substantial (often 60-70% smaller than 100% quality) and the visual difference is imperceptible at normal viewing sizes. For images with text, sharp lines, or solid color areas, use 85-90% to avoid compression artifacts. PNG compression is lossless, so the quality slider does not affect PNG output — only dimensions apply.
Downscaling (reducing dimensions) does not degrade visual quality — it simply contains fewer pixels, which is fine as long as you are not displaying the image larger than its new dimensions. Upscaling (increasing dimensions) stretches pixels and will make the image look blurry. For the best results when downscaling, use high-quality bicubic interpolation — the browser-image-compression library handles this automatically.
No. All image processing happens entirely in your browser using the Canvas API and the browser-image-compression library. Your image files never leave your device. You can verify this by enabling airplane mode — the tool continues to work with no internet connection.
In practice, the tool can handle files up to several hundred megabytes depending on your device's available RAM, since the image is decoded entirely in browser memory. For very large files (50MB+), processing may take several seconds. If your browser tab runs out of memory, it may crash — in that case, try a desktop application like Squoosh, GIMP, or Photoshop.
WebP is a modern image format developed by Google that provides superior lossless and lossy compression. WebP images are 25-35% smaller than comparable JPEGs and 26% smaller than comparable PNGs. All current versions of Chrome, Firefox, Safari (since 14), and Edge support WebP. If you are optimizing images for a website, WebP is the recommended choice for the best balance of quality and file size.
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