How to use this tool

1. Fill in the inputs.
2. Read the result.
3. Copy or download as needed.

About the Image Compressor

The Image Compressor reduces the file size of a photo or graphic by adjusting its compression quality, letting you find the right balance between visual quality and download size. Upload an image, drag the quality slider, and instantly see the new file size along with an estimate of how much space you have saved compared to the original.

Smaller image files load faster on websites, take up less storage space, and are quicker to email or upload, all without necessarily requiring a visible drop in quality if you choose a sensible compression level.

The tool loads your image into an HTML canvas element in your browser, then re-encodes it as a JPEG using the compression quality percentage you select. JPEG compression works by selectively discarding some visual information that the human eye is less sensitive to, and the lower the quality percentage, the more aggressively this happens, resulting in a smaller file at the cost of some fine image detail.

Because the entire process — decoding, re-encoding, and measuring the resulting file size — happens locally using your browser's built-in canvas and image APIs, no image data is ever uploaded anywhere, and you can experiment freely with different quality levels to see the size and quality trade-off before committing to a final download.

Common use cases

• Shrinking large photos before uploading them to a website to improve page load speed.
• Reducing image file sizes to fit within an email attachment size limit.
• Preparing images for a portfolio or gallery where fast loading matters more than maximum fidelity.
• Saving storage space on a device by compressing a batch of large photos one at a time.
• Testing how much compression an image can tolerate before quality loss becomes visually noticeable.

Tips and best practices

• Start around 75–85% quality for most photographic images — this typically gives a significant size reduction with minimal visible quality loss.
• Images with lots of fine detail or texture (like landscape photography) tend to show compression artifacts sooner than simpler images with large flat areas of color.
• This tool converts the output to JPEG format, which does not support transparency — if you need to preserve a transparent background, use the Image Converter tool with PNG or WebP output instead.
• Always keep a copy of your original, uncompressed image in case you need to re-compress at a different quality level later.

Frequently asked questions