Reduce Image Size Online – Free & Private
Make images smaller without losing visible quality. Resize, convert and compress in your browser — no upload.
Drop your image here or click to upload
Images are usually the heaviest part of a web page. If a photo is 4 MB but displayed at 800 pixels wide, most of that data is wasted. Reducing the file size fixes this without any visible loss.
Three ways to reduce image size
- Resize dimensions: shrink the image to the size it is actually shown at. This usually has the biggest effect.
- Convert the format: switching to WebP often cuts the size by 25–35% compared with JPG, and much more compared with PNG.
- Lower the quality: a small reduction in quality can dramatically shrink the file.
How to reduce image size with FormatFlash
- Drop your image onto the converter above.
- Choose WebP (or JPG) as the output format.
- Lower the quality slider to reduce the size further.
- Convert and download the smaller file.
To change the actual dimensions, open the full image converter, which includes a resize option alongside format and quality controls.
Tips
Resize before compressing
Always create images at the largest size you will display them. Downscaling an oversized image is the single biggest win.
Keep an original
Store the full-resolution original separately and use the reduced version only for the web.
Frequently asked questions
How can I reduce an image file size?
The most effective ways are to resize the image to the dimensions you actually need, convert it to WebP, and lower the quality slightly. FormatFlash does all of this in your browser.
Are my images uploaded?
No. Every step runs locally on your device.
Will reducing the file size ruin the quality?
At sensible settings the difference is barely visible, especially for photos viewed on screen.
What is the smallest format?
WebP usually produces the smallest files for the web, followed by JPG.
Is there a size limit?
No fixed limit — the only practical limit is your device's memory.
Related guides
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