Image Compressor
Compress images to reduce file size while maintaining visual quality. Adjust compression levels with a quality slider and preview results before downloading.
Drop an image here or click to browse
Supports PNG, JPG, and WebP
Original
Compressed
Saved
Original
Compressed
Click "Compress" to see result
Lossy vs lossless: how image compression actually works
Lossless compression shrinks a file by storing the same pixels more efficiently — nothing is thrown away, and the image is bit-for-bit identical when opened. It's safe but limited: savings on photos are usually modest. Lossy compression discards visual detail your eye is unlikely to notice — subtle color variations, high-frequency texture — and that's where the dramatic 70–90% size reductions come from. The quality slider on this tool controls how aggressive that trade-off is. The sweet spot for most photos is 75–85%: files shrink to a fraction of their original size while looking indistinguishable at normal viewing sizes.
Choosing a quality setting
- 85–90% — near-perfect quality for portfolio images, product photography, and print previews.
- 75–85% — the default range for website images and blog posts; visually clean at a fraction of the size.
- 60–75% — thumbnails, avatars, and previews where small size matters more than close inspection.
- Below 60% — only for very small display sizes; expect visible artifacts on edges and gradients.
Target sizes worth aiming for
As a rule of thumb: hero and banner images should land under 200 KB, in-content images under 100 KB, and thumbnails under 30 KB. Oversized images are the single most common cause of slow pages and poor Largest Contentful Paint scores, and email providers often reject attachments over 20–25 MB — compressing a batch of photos before sending routinely cuts a 40 MB email down to a few megabytes. Everything here happens locally in your browser, so you can compress sensitive screenshots or client photos without them ever touching a server.
How to use Image Compressor.
- 1
Drag and drop an image onto the upload area, or click to browse files
- 2
Adjust the quality slider to set your desired compression level (lower = smaller file, higher = better quality)
- 3
Preview the compressed image and compare the before/after file sizes
- 4
Click 'Download' to save the compressed image to your device
Why use this tool.
Reduce image file sizes by up to 80% without noticeable quality loss
Speed up your website by serving optimized images
Fine-tune compression with the quality slider to find the perfect balance
Compare before and after file sizes to see exactly how much space you saved
Process images privately — everything runs in your browser
About Image Compressor.
True Tool Deck's Image Compressor is a free online tool that reduces image file sizes while preserving visual quality. With an intuitive quality slider, you can fine-tune the compression level to achieve the perfect balance between file size and image clarity. The tool provides a real-time before/after file size comparison so you can see exactly how much space you're saving. All compression happens client-side using the HTML5 Canvas API — your images are never uploaded to any server, ensuring complete privacy. Whether you're a web developer optimizing page load times, a blogger reducing hosting bandwidth, or anyone who needs smaller image files, this compressor delivers professional results instantly.
Frequently asked questions.
How much can I compress an image?
Compression results vary depending on the image. Typically, you can reduce file sizes by 40–80% at quality level 60–80 without noticeable visual degradation. Photos with large areas of solid color compress more than detailed photographs.
Will compression reduce image quality?
Some quality reduction is inherent in lossy compression, but at quality levels of 70–85, the difference is usually imperceptible to the human eye. The slider lets you find the perfect balance between file size and quality.
What image formats can I compress?
The compressor supports JPEG/JPG, PNG, and WebP formats. The output is optimized as JPEG or WebP for the best compression ratios.
Is there a limit on how many images I can compress?
No. You can compress as many images as you like, one at a time. Since processing happens in your browser, there are no server-side limits.
Does this tool compress images losslessly?
This tool uses lossy compression, which achieves much smaller file sizes than lossless methods. For lossless compression, use PNG format, though the file size reduction will be minimal.