🗜️ Image Compressor
Reduce image file size by adjusting quality and maximum dimensions using the browser Canvas API. Supports JPEG, PNG, and WebP. Your images never leave your device.
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How to Use the Image Compressor
The Image Compressor reduces the file size of images using the browser's Canvas API — no upload required and your images never leave your device. Click Select Image and choose any JPEG, PNG, or WebP image. Before compressing, set your preferences: use the Quality slider to control compression (100% = original quality, 60–80% is usually ideal for a good size/quality balance), set a Max Width to downscale large images (e.g., 1920px for web use), and choose the Output Format (JPEG is best for photos, WebP gives the best compression with modern browser support, PNG for graphics with transparency). The tool shows the original and compressed file sizes and the percentage reduction achieved. Click Download Compressed to save the result. For photos, switching from PNG to JPEG or WebP typically reduces file size by 60–80%. For images with transparent backgrounds, use WebP (not JPEG, which removes transparency). Multiple compressions can be run by selecting another file. The entire process runs in your browser — zero server involvement.
Frequently Asked Questions
How does browser-based image compression work?
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Browser-based image compression uses the HTML5 Canvas API. The image is drawn onto an invisible canvas at the target dimensions, then exported using canvas.toBlob() with a specified MIME type and quality setting. The quality parameter (0.0 to 1.0) controls the JPEG or WebP compression ratio. PNG uses lossless compression so the quality setting only affects JPEG and WebP output.
What is the difference between lossy and lossless compression?
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Lossy compression (used by JPEG and WebP) permanently discards some image data to achieve smaller file sizes. The lower the quality setting, the more data is discarded and the smaller the file — but visible artifacts (blurring, banding) appear at very low quality. Lossless compression (used by PNG) encodes data more efficiently without discarding anything, preserving every pixel exactly but with less dramatic file size reduction.
Should I use JPEG, PNG, or WebP for web images?
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Use JPEG for photographs and images with many colors — it achieves excellent compression. Use PNG for logos, icons, screenshots, and images with transparency (since JPEG does not support alpha channels). Use WebP for the best results in modern browsers — it achieves 25–35% smaller files than JPEG at equivalent quality and supports transparency. For maximum browser compatibility, JPEG is the safest choice.
Is my image safe when I use this tool?
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Yes. The Image Compressor works entirely in your browser using the Canvas API. Your image file is read into browser memory, processed on your device, and the result is offered as a download — all without any network request. Your images are never uploaded to any server, stored, or processed outside your browser. This makes the tool safe for compressing confidential or private images.