The image tool helps choose dimensions, format and quality. Processing happens in the current browser; using the tool does not upload the image to our server.
How the rule works
JPG generally suits photographs; PNG supports transparency and sharp interface graphics. Resize to the actual use first, then adjust quality.
Calculation method
New height = original height × new width ÷ original width when preserving aspect ratio. File size also depends on complexity, format and quality.
Three practical examples
- Resize a 4000×3000 web photo to 1600×1200 and export JPG to reduce size substantially.
- Keep a transparent logo as PNG; JPG replaces transparency with a solid background.
- PNG often keeps text screenshots sharper, though complex images may be larger.
Special cases and limits
- Keep the original because browser processing is not a backup.
- Repeated lossy JPG saves accumulate artefacts.
- Metadata handling varies by browser and output method.
Frequently asked questions
Are images uploaded?
No. Processing is local in the browser.
Why can the result become larger?
Format, transparency and image complexity can outweigh reduced dimensions.
Sources and review
This browser-image guide does not rely on a government calculation rule.
Written and reviewed by the QuickCalc editorial team. Last reviewed: 4 Sep 2026. To report a rule or calculation error, email contact@zevlis.com.