Image Compressor
Upload an image and drag the quality slider to reduce its file size while keeping as much visual quality as you need — with a live before/after comparison.
Click to upload, or drag and drop an image
Nothing is uploaded to a server — everything happens in your browser
How to Use This Tool
Upload your image
Click the box above or drag and drop any JPG, PNG or similar image.
Drag the quality slider
Lower values mean smaller files but more visible compression.
Compare the file sizes live
Watch the before/after size update as you adjust the slider.
Click Download
Save the compressed image once you're happy with the trade-off.
About the Image Compressor
Image compression reduces file size by selectively discarding some visual information in a way that's designed to be as imperceptible as possible to the human eye. It's one of the highest-impact things you can do for a website's page speed, since images are typically the largest assets on any page.
This tool uses JPEG-style lossy compression with an adjustable quality slider from 10% to 100%. Higher values preserve more detail but produce larger files; lower values shrink the file more aggressively at the cost of visible quality loss, particularly in areas with fine detail or subtle color gradients.
Because it's applied live as you drag the slider, you can visually and numerically compare the trade-off in real time before committing to a download — helping you find the sweet spot between file size and visual quality for your specific image.
Frequently Asked Questions
What quality percentage should I use?
70-80% is a reasonable starting point for most photographic images — it usually looks nearly identical to the original while meaningfully reducing file size. Images with lots of fine detail or text may need a higher setting; simple images with large flat color areas can often go lower.
Does this tool support PNG compression too?
This tool applies lossy JPEG-style compression, which works on any image format you upload, but note that a PNG with transparency will have its transparent areas filled with white, since the compressed output uses JPEG encoding.
Why does the file size chart look non-linear as I move the slider?
Lossy compression algorithms don't reduce file size in a straight line relative to quality — dropping from 100% to 90% quality often saves relatively little, while dropping from 50% to 30% can cut the file size dramatically, since the algorithm is discarding progressively more visual information.
Will compressing an already-compressed JPG hurt quality further?
Yes, to some degree — since JPG compression is lossy, re-compressing an already-compressed JPG adds a second generation of quality loss on top of the first, sometimes called generation loss. It's best practice to compress from the original, highest-quality source whenever possible.
How much can I realistically shrink a typical photo?
It varies a lot by image content, but reducing a high-resolution photo by 60-80% in file size while keeping acceptable visual quality is common, especially for images that were originally saved at very high (near-lossless) quality.
Is my image uploaded anywhere during compression?
No — the compression happens entirely in your browser using the Canvas API's built-in encoding. Your original file is never sent to a server.