Image Compressor

How to Compress Images

1. Upload: Drag & drop images onto the area above, or click "Choose Images" to select files. You can select multiple images at once.
2. Adjust Settings: Set your desired quality (80% is a good default), choose an output format, and optionally resize.
3. Compress: Click "Compress All" to process all images in your browser instantly.
4. Download: Download individual images or click "Download All as ZIP" for bulk download.

Tips for Best Results

• Photos: Use JPEG or WebP at 70–85% quality for significant size reduction with minimal visible quality loss.
• Logos & Graphics: Use PNG to preserve sharp edges and transparency, or WebP for smaller size with transparency support.
• Web Images: WebP gives the best compression for modern browsers. For maximum compatibility, use JPEG.
• Social Media: Use 1280px max width — platforms compress further anyway so there's no benefit in uploading 4K images.

Format Comparison

How Image Compression Works

Image compression reduces file size in one of two ways. Lossless compression (used by PNG) rewrites the image data more efficiently without discarding any detail — the decompressed image is pixel-for-pixel identical to the original. Lossy compression (used by JPEG and optionally WebP) achieves much smaller files by permanently removing information the human eye is least likely to notice, such as subtle colour variations and high-frequency detail. The “quality” slider controls how aggressively this information is discarded: 100% keeps almost everything, while lower values trade visual fidelity for smaller size.

For most photographs, a quality setting of 75–85% removes a large amount of data while remaining visually indistinguishable from the original at normal viewing sizes. Below about 60%, compression artefacts — blocky patches and colour banding — start to become noticeable, especially in smooth gradients like skies.

Why Image Size Matters for Web Performance

Images are typically the largest assets on a web page, often accounting for more than half of the total page weight. Large, uncompressed images slow down page loading, hurt your Core Web Vitals scores, and increase bounce rates — studies consistently show visitors abandon pages that take more than three seconds to load. Compressing images before uploading them can cut page weight dramatically, improving both user experience and search engine rankings. For mobile users on slower connections, the difference between a 4 MB and a 400 KB image is the difference between an instant load and a frustrating wait.

Your Images Never Leave Your Device

This compressor runs entirely in your browser using the HTML Canvas API. Your images are processed locally on your own device and are never uploaded to any server. This means your photos remain completely private, compression is instant with no upload wait, and the tool works even with sensitive documents you would not want to send over the internet.

Choosing the Right Quality Setting

• 90–100%: Archival or print use where you want the smallest possible loss.
• 75–85%: The sweet spot for website hero images and blog photos — large savings, no visible loss.
• 60–75%: Thumbnails and previews where file size matters more than fine detail.
• Below 60%: Only when extreme compression is essential; expect visible artefacts.