Image Compressor Online
Reduce image file size with an adjustable quality slider, fully in your browser. Free to use, no signup required for occasional use.
Runs fully in your browser via the Canvas API — nothing is uploaded.
What is the Image Compressor?
The Image Compressor reduces an image's file size by re-encoding it as a JPEG at an adjustable quality level, using the browser's Canvas API. Smaller image files load faster on websites, take up less storage, and are easier to share over email or messaging apps. This tool shows you the original file size next to the compressed result so you can see exactly how much space you're saving at each quality setting, letting you find the right balance between visual quality and file size for your use case.
How to use it
Upload an image and use the quality slider to choose a compression level between 10% and 100%. Lower values produce smaller files but more visible compression artifacts; higher values preserve more detail at a larger size. Click 'Compress image' to generate the result, compare the before/after file sizes shown under each preview, and download the compressed JPG when you're happy with the trade-off.
Frequently asked questions
What quality setting should I use?
70-85% quality is a good starting point for most photos, offering a noticeable size reduction with minimal visible quality loss.
Does compression change the image format?
The compressed output is saved as a JPG, since JPEG compression is what the quality slider controls.
Is my image uploaded to a server for compression?
No, compression happens entirely in your browser using the Canvas API.
Can I compress PNG images?
Yes, you can upload a PNG and it will be compressed and exported as a JPG.