OnlineFreeToolBoxHow-to guide
How to Compress an Image to 100KB Online Free
Photos straight from a camera are far larger than a website or a message needs, which makes pages slow and uploads painful. This guide shows how to compress an image for free, in your browser — re-encode it as a JPEG at the quality you choose, keeping the same pixel dimensions while the file gets smaller. Use the free image compressor below to compress your image to 100KB in seconds.
How to Compress an Image — step by step
- Choose an image file to compress.
- Set the JPEG quality level you want.
- Check the preview to compare quality and size.
- Download the compressed image.
Tips
- 70% is a good starting point for photos on the web — lower quality gives a smaller file with more visible artefacts.
- Compression keeps the pixel dimensions; only the file size shrinks.
- Compressing twice rarely helps — if you need a smaller file, lower the quality on the first run instead.
Frequently asked questions
Does compression change the image size in pixels?
No. This tool keeps the pixel dimensions and reduces file size by re-encoding at the chosen quality.
Can I compress the same image twice?
Yes, but the second run usually saves very little, because the first compression already removed the easy savings. If you need a smaller file, lower the quality setting on the first run instead of compressing twice.
What quality should I choose?
70% is a good starting point for photos on the web. Lower quality gives a smaller file with more visible artefacts; higher quality keeps detail but saves less space.