What this tool does
Change image width and height locally, preserve the aspect ratio, and process several files with one setting.
Practical guidance
Use pixel dimensions when a platform specifies an exact canvas, and percentage scaling for proportional batches. Enlarging changes pixel count but cannot create genuine detail missing from the source.
Three simple steps
- Add one or more images.
- Enter pixels or a percentage and choose the aspect-ratio setting.
- Preview the new dimensions and download.
Private by design
Your images are processed in this browser. They are not sent to our server.
Frequently asked questions
Can I resize without stretching the image?
Yes. Keep the aspect ratio locked so changing one dimension updates the other.
Does enlarging improve image quality?
No. Enlarging creates more pixels but cannot restore detail missing from the original.
Concrete input and output example
Input a 4000×3000 JPEG and request 1200×900 with aspect ratio locked. The output contains 1.08 million newly sampled pixels; enlarging it later cannot restore the removed 10.92 million source pixels.
Browser compatibility notes
Reviewed against the implementation and required web APIs on 2026-08-12. Use a current browser where these APIs are available and verify important output on your device.
- Chrome / Edge (current desktop)
- Requires local decode, canvas, encoding, Blob download, and enough memory; verify the downloaded image.
- Firefox (current desktop)
- Uses the same standard local APIs; color rendering can differ slightly from Chromium.
- Safari (current desktop)
- Uses canvas and Blob downloads; available memory and codec behavior remain WebKit-controlled.
A tool-specific question
Does enlarging with this tool add real detail?
No. Interpolation creates additional pixels from existing neighbors; it cannot reconstruct text, focus, or texture absent from the source.