Image Compressor
Image compression reduces file size by removing redundant data. Lossy compression (JPEG, WebP) discards visual data for smaller files but lower quality. Lossless compression (PNG) preserves exact pixels but larger files. Typical compression: JPEG at 80% quality saves 60-70% size with minimal visible loss. For web: compress images to 100-200 KB for fast loading. Tools: TinyPNG, ImageOptim, Squoosh. WebP format offers 25-35% better compression than JPEG. Balance quality vs size: 60-80% quality for photos, 85-95% for graphics.
Compress and resize images in your browser. Adjust quality, set max dimensions, and convert between JPEG, PNG, and WebP formats. Side-by-side preview with file size comparison. Batch mode for multiple images. All processing is client-side — no uploads.
Upload Images
Drag & drop images here, or click to browse
Accepts JPG, PNG, WebP • Multiple files supported
Compression Settings
How to Use
- Enter your value in the input field
- Click the Calculate/Convert button
- Copy the result to your clipboard
Frequently Asked Questions
- How does image compression work?
- Image compression reduces file size by removing redundant or less important data. Lossy compression (JPEG, WebP) discards some visual detail based on the quality setting — lower quality means smaller files but more visible artifacts. Lossless compression (PNG) reduces size without any quality loss by finding more efficient ways to store pixel data. This tool uses the HTML5 Canvas API to re-encode images at your chosen quality level.
- What is the best image format for web?
- WebP is generally the best format for web images, offering 25-35% smaller files than JPEG at equivalent quality, with support for transparency. JPEG is ideal for photographs when broad compatibility is needed. PNG is best for images requiring transparency or with text/sharp edges where lossless quality matters. Use WebP when possible, JPEG as fallback for photos, and PNG for graphics with transparency.
- What quality setting should I use?
- For most web images, a quality of 75-85% offers the best balance between file size and visual quality. At 80%, most images look nearly identical to the original while being 50-70% smaller. Below 60%, artifacts become noticeable, especially in areas with gradients or fine detail. For thumbnails or previews, 60-70% is often sufficient. For print or high-quality display, use 90-95%.
- Does resizing affect image quality?
- Reducing image dimensions (downscaling) generally maintains good quality because pixels are merged together. Increasing dimensions (upscaling) reduces quality because new pixels must be interpolated. For best results, resize down to the exact dimensions needed for display — a 4000×3000 photo displayed at 800×600 wastes bandwidth. This tool only downscales, preserving aspect ratio automatically.
- Is my image data safe?
- Yes, completely. All image processing happens directly in your browser using the HTML5 Canvas API. Your images are never uploaded to any server. The tool runs entirely client-side with JavaScript, so your files stay on your device. This also means the tool works offline once the page is loaded.
- Why is my compressed PNG larger than the original?
- PNG uses lossless compression, so the quality slider has no effect. If you convert a JPEG to PNG, the file may actually grow because PNG preserves all pixel data without lossy compression. For smaller files, use JPEG or WebP format instead. PNG compression depends on image content — images with large areas of the same color compress well, while photographs do not.