Introduction
Compression and resizing are often confused, but they solve different problems.
Compression: reduce file size
- Dimensions stay the same.
- Storage size drops (for example, 2MB to 200KB).
- Minor quality trade-off may appear with lossy modes.
Resizing: change width and height
- Pixel dimensions change.
- File size changes with dimensions.
- Upscaling can cause blur.
Which one should you use?
| Goal | Method | Reason |
|---|---|---|
| Improve page speed | Compression | Keep display size, reduce weight |
| Match platform spec | Resizing | Need exact dimensions |
| Need both | Resize + compress | Combine compatibility and speed |
Conclusion
Quick memory: compression is file-weight reduction, resizing is dimension change. Choose by task objective.