Image Compressor – Reduce Image File Size Online Safely
Heavy images slow down websites, consume bandwidth, and block email attachments. This image compressor shrinks file sizes by removing unnecessary metadata and optimizing pixel maps directly in your browser.
Reduce image file sizes in KB online without losing visual quality using browser-side canvas compression. Compress PNG, JPEG, and WebP images. Zero files are uploaded to any server, guaranteeing 100% data privacy and instant processing.
How to Use the image compressor
When you drag-and-drop an image, the tool draws it onto an offscreen HTML5 canvas element, adjusts its quality scaling ratio, and outputs a compressed blob for you to download.
- 1Drag and drop your image (PNG, JPG, or WebP) or click to choose from your device.
- 2Use the quality slider to adjust the compression factor (lower quality reduces file size further).
- 3Compare the original vs. compressed preview and click Download to save the optimized file.
Browser-Side Image Compression
Compression decreases quantization precision in the discrete cosine transform (for JPEGs) or scales color maps (for PNGs) entirely client-side.
Compressed Output = Canvas.toBlob(originalImage, "image/jpeg", qualityFactor)Common Reference Values & Comparisons
Refer to this table to study common calculations, reference ratios, or performance profiles for this tool:
| Format | Standard Compression Level |
|---|---|
| JPEG Quality 80% | 70-80% file size reduction (lossy) |
| JPEG Quality 50% | 85-90% file size reduction (lossy) |
| PNG Lossless | No quality loss, removes meta headers |
| WebP Conversion | Highly optimized modern web format |
| Max Upload Size | No limit (processed in local browser memory) |
Frequently Asked Questions (FAQ)
Optimizing images is the single easiest way to speed up your website. Use this safe browser-based tool to optimize your graphics library before uploading to production.
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