Maintained by Image Reshaper · Updated
Why Does My Image Look Blurry After Resizing?
Diagnose upscaling, compression artifacts and display scaling, then choose dimensions that match where your image will appear.
Enlarging a small image cannot recover detail
If the original is 400 pixels wide and you enlarge it to 1200, the browser must interpolate new pixels. It cannot recover the detail of a 1200-pixel original. Start from a larger source when possible.
Blur can also come from repeated JPG encoding, low quality, or displaying an image larger than its output dimensions. Stretching changes shapes; it is a different problem from blur.
Check the source, output and display separately
Our square examples below all have the same output dimensions. Their composition differs because Fit, Crop and Stretch solve different problems. Inspect them at actual size, not only in a scaled preview.
For crisp text, prefer a clean PNG source and avoid repeated resizing. For photographs, inspect fine detail before choosing a lower-quality JPG or WebP.
- Open the original and confirm it is sharp before editing.
- In Image Resizer, use dimensions suited to the final display and preserve proportions.
- Avoid upscaling unless the destination requires it.
- Download once and compare at 100% zoom. Keep the original for another attempt.
Try our measured examples
Created and tested on 2026-10-06 in Chrome 154.0.8037.98. These images were generated by this project. Results vary with source content and browser encoder; no camera photograph was used.
Method: deterministic Canvas-generated 1200 × 800 sources, the production renderImage/compressToMaxBytes functions, quality 80 for format comparisons, and an automatic bounded search for byte targets. Resize examples export PNG. No measurements of network speed or field Core Web Vitals are implied.