Image Compressor
Compress images directly in your browser. Reduce file size while maintaining quality. Supports JPEG, PNG, and WebP formats.
Drag & drop an image here, or click to select
How to Use
- Drag and drop an image or click to upload
- Adjust the quality slider to set compression level
- Preview the compressed result and compare file sizes
- Click Download to save the compressed image
Frequently Asked Questions
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Is my image uploaded to a server?
No. All image compression happens locally in your browser using the Canvas API. Your images never leave your device.
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What image formats are supported?
This tool supports JPEG, PNG, and WebP input formats. You can output as JPEG or WebP for the best compression ratios.
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How much can images be compressed?
Compression results vary by image content. Typically, JPEG images can be reduced by 50-80% with minimal visual quality loss.
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What is the maximum file size?
Since processing happens in your browser, the limit depends on your device's memory. Most devices handle images up to 20MB without issues.
Why Image Compression Matters
Images are the largest contributors to page weight on most websites. According to HTTP Archive data, images account for over 50% of total bytes transferred on the average web page. Large images slow down page loads, hurt Core Web Vitals scores, and cost users data on mobile connections.
Compressing images before uploading them is one of the highest-ROI optimizations available to web developers and content creators.
Lossy vs. Lossless Compression
Lossy compression permanently removes some image data to achieve smaller file sizes. JPEG uses lossy compression, which is why very high compression ratios can introduce visible artifacts (blocky patterns, color banding). The art is finding the threshold where compression savings are large but quality loss is imperceptible.
Lossless compression reduces file size without losing any data. Every pixel is preserved exactly. PNG uses lossless compression for its main data, though it also supports an optional filtering step. Lossless compression produces larger files than lossy compression but is appropriate for icons, diagrams, screenshots, and images where pixel-perfect accuracy matters.
Format Guide
JPEG is best for photographs and complex images with many colors and gradients. Its lossy compression excels at natural scenes where minor quality loss is invisible to the human eye.
PNG is best for graphics with hard edges, text, logos, and icons. Its lossless compression preserves sharp edges perfectly, unlike JPEG which tends to blur them.
WebP is a modern format developed by Google that offers both lossy and lossless compression, typically 25–35% smaller than equivalent JPEG/PNG files. Browser support is now nearly universal. Consider converting all images to WebP for web use.
How This Tool Works
This tool uses the browser's Canvas API to re-encode images. The process works by:
- Drawing the uploaded image onto an HTML canvas element
- Exporting the canvas as a new JPEG or WebP image at the specified quality level
- Offering the result as a download
All processing happens locally — no image data is ever sent to a server. This makes it safe to compress confidential screenshots, personal photos, or proprietary designs.
Tips for Best Results
- Start with a quality setting of 80% — it typically reduces JPEG files by 50-60% with no perceptible quality loss.
- For images with text or sharp lines, use 85%+ quality or switch to PNG.
- Convert photos to WebP for the best size-to-quality ratio on the web.