Compression controls that stay predictable
- Choose Original to keep pixel dimensions unchanged.
- Choose a maximum dimension to reduce only oversized images.
- Adjust quality from 70–95% and compare the real result size.
Free Image Compressor
Reduce image file size without square padding or unexpected cropping. Choose quality and an optional maximum dimension.
Runs on your device — no upload required
Drop or choose imagesChoose files from your device or drag them hereYou can also paste an image with Ctrl+V / Cmd+V.
A compressor should reduce bytes, not add a square canvas. OpenFileTools preserves aspect ratio and only reduces dimensions when the longest side exceeds your selected maximum.
How OpenFileTools processes it
Local processing, explicit choices.
The browser decodes the image, calculates an aspect-ratio-safe output size, encodes WebP at your chosen quality, and reports the measured result.
Quick technical summary
What this tool changes.
| Property | Behavior |
|---|---|
| Processing | Browser only; no image upload |
| Original | Never changed |
| Output | WebP |
| Dimensions | Original or proportional maximum |
Compression is not the same as resizing
Quality controls how aggressively the browser encodes the result; maximum dimension controls whether oversized pixel dimensions are reduced. Choose Original dimensions when only encoding should change.
- The current output is WebP.
- Aspect ratio remains unchanged.
- No fixed percentage saving is promised.
Read the measured result
An already optimized image can become larger after re-encoding. OpenFileTools reports dimensions, format, original bytes, processed bytes, and percentage saved only after the browser has created the output.
- Keep the original when the processed result is larger.
- Lower quality gradually and inspect visible detail.
Questions, answered.
Will compression resize my image?
Only when you choose a maximum dimension smaller than the source.
Why did my file become larger?
The source may already be efficiently encoded for its content.
Can you promise a percentage reduction?
No. Savings depend on source detail, format, dimensions, and quality.
When should I keep original dimensions?
Use Original when pixel size must not change and you only want to test a new encoding.