Compress Images
Bulk image compressor for JPG, PNG, WebP, and AVIF. Reduce image size for websites, email, or social media — without uploading a single file.
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How to Compress Images
Select your images
Choose files or drag and drop them into the compressor.
Compress
Pick a format and quality level, then click the compress button.
Download
Download the optimized images individually or as a ZIP.
Can you tell the difference?
Move the slider to compare the compressed image with the original. The file size is reduced by more than 80% — with no visible quality loss.
Original — 1.7 MBCompressed (AVIF) — 328 KBImage Formats Explained
Not sure which format to pick? Here is a quick guide to help you choose the right one. You can also convert between formats with our free tools.
JPEG
Best for: Photos & complex images
JPEG is the most widely used image format on the web. It uses lossy compression to dramatically reduce file sizes while keeping photos looking sharp. Best for photographs, social media images, and any image with smooth gradients or many colors.
PNG
Best for: Graphics, logos & screenshots
PNG preserves every pixel of your image with lossless compression — what you see is exactly what you get. It supports transparency, making it the go-to format for logos, icons, UI elements, and screenshots where crisp edges matter.
WebP
Best for: Web performance
WebP delivers both lossy and lossless compression with files up to 30% smaller than JPEG at the same visual quality. It supports transparency and is now accepted by all modern browsers, making it the smart default for fast-loading websites.
AVIF
Best for: Maximum compression
AVIF is the newest image format and offers the best compression efficiency available today. It can reduce file sizes by up to 50% compared to JPEG while maintaining excellent quality. Ideal when every kilobyte counts — think mobile-first sites and image-heavy pages.
Why LeanImg?
Images are the heaviest assets on most web pages, often accounting for over half of total page weight. If you need to compress images for a website, unoptimized files slow down page loads, hurt Core Web Vitals scores, and directly impact search engine rankings — Google uses page speed as a ranking signal for both desktop and mobile results. Beyond SEO, large images eat into bandwidth caps, increase hosting costs, and frustrate users on slower connections. Need to reduce image size for email? Providers like Gmail cap attachments at 25 MB, making compression essential. Social media platforms re-compress uploads anyway, so starting with a well-optimized image gives you more control over the final quality. LeanImg lets you compress images without uploading — everything runs locally in your browser, so your files never leave your device. Explore all of our free image tools to optimize your workflow.
Optimal Quality
Smart compression reduces file size without sacrificing quality. The difference is nearly invisible.
Faster Websites
Smaller images mean faster page loads, better SEO rankings, and lower bandwidth costs.
No Software to Install
Compress images online in seconds. No downloads, no sign-ups — just drag, drop, and go.
Frequently Asked Questions
Why should I compress my images?
Optimizing your images reduces file sizes by up to 80% without sacrificing quality, leading to faster page loads. This is essential for keeping user attention and ensuring a great user experience. Smaller images also minimize bandwidth usage and improve your website's search engine ranking.
What does LeanImg do?
LeanImg uses smart lossy and lossless compression to reduce the file size of your JPG, PNG, WebP, and AVIF images. By selectively optimizing image data, fewer bytes are required to store the image. The effect is nearly invisible but makes a very large difference in file size.
What file formats does LeanImg support?
LeanImg supports JPG, PNG, WebP, AVIF, and GIF for compression. You can also convert between these formats. All processing happens in your browser — images are never uploaded to a server. JPG and WebP are ideal for photos, PNG for graphics with transparency, and AVIF for next-gen compression efficiency.
How much can I compress my images?
Typical compression reduces file size by 40–80%, depending on the image content and format. Photos with smooth gradients compress very efficiently. You can adjust the quality slider to compress an image to a specific size — for example, under 100 KB for web use — and find the perfect balance between file size and visual quality.
Can I compress images without losing quality?
Yes. Select the lossless PNG output format for pixel-perfect compression with zero quality loss. Lossless compression typically reduces file size by 10–40%. For even smaller files, lossy formats like JPG or WebP at quality 75–85 produce results that are virtually indistinguishable from the original.
Can I compress multiple images at once?
Yes. LeanImg works as a bulk image compressor — select up to 10 images at a time and compress them all in one go. Once compressed, download them individually or all at once as a ZIP file. Batch compression runs entirely in your browser with no upload required.
Have more questions? Learn more about LeanImg and how we process your images.
Need to resize first? Resize your images to exact dimensions before compressing. Or convert between formats like JPG, PNG, WebP, AVIF, and more.