Image size converter (px, cm, inches, KB)
Convert between pixels and cm/inches using DPI, then resize. For KB targets, compress after resizing.
Unit conversions
- pixels = inches × DPI
- inches = cm ÷ 2.54
- inches = mm ÷ 25.4
KB targets
- Compress after resizing to hit 100KB/200KB.
- Use WebP for smaller file sizes.
3 steps (using this workflow)
- Convert units to pixels using DPI.
- Resize to pixel dimensions.
- Compress to a KB target if needed.
Need a specific guide?
Use the links below for cm/inches, pixels, or KB targets.
FAQ
What does an image size converter do?
It converts between pixels, cm/inches, and KB targets.
Quick tip: Use DPI for physical units and compression for KB targets.
Common mistake: Mixing up pixels and KB—these are different concepts.
How do I convert inches/cm to pixels?
Pixels = inches × DPI. For cm, divide by 2.54 first.
Quick tip: Use 300 DPI for print.
Common mistake: Skipping DPI—size will be wrong.
How do I hit a KB file size?
Resize dimensions first, then compress with WebP/JPG.
Quick tip: Adjust quality to reach the target size.
Common mistake: Only resizing dimensions—KB may still be too large.
Do you upload my images?
No. Processing happens locally in your browser. Your files are not uploaded.
What size should I use?
Use the recommended size.
Which export format should I use?
JPG for photos, PNG for text/logos or transparency, WebP for smaller files (if supported).
Crop vs Pad — what is the difference?
Crop fills the target size (may cut edges). Pad fits the whole image and adds background/space.
How do I protect text and logos?
Keep important content centered and avoid placing critical text at the edges.
Can I batch resize?
Yes. Use the Batch Resizer to apply the same size to many images.