Image Resizer

How to resize an image

1. Choose one JPG, PNG or WebP file, or drop it on the file area. Check the original dimensions and file size. The limit is 20 MB and 40 megapixels, with neither side above 16,384 pixels; your browser may have a lower practical limit.
2. Enter a new width or height with Keep proportions selected, or choose Percentage. Turn proportions off only if you want to stretch the image to an exact width and height. More options lets you select an output format and JPEG or WebP quality.
3. Select Resize image, check the finished preview, dimensions, format and actual file size, then download it. Editing the settings removes the previous downloadable result until you resize again.

Dimensions, proportions and image formats

Pixel dimensions describe width and height. File size describes the number of bytes stored. A smaller pixel image often uses fewer bytes, but this depends on the image, format and encoder. This tool does not guarantee a target size in KB or MB.

Keep proportions derives the other side from the original image ratio and rounds to whole pixels. Percentage applies to both original dimensions: 50% makes each side half as large and leaves approximately one quarter of the pixel count. Small rounding differences are normal.

PNG preserves transparency and encodes the resized canvas pixels without additional lossy compression. JPEG uses a white background and lossy compression. WebP supports transparency with the selected quality when the browser can encode it. Quality settings are not percentages of file-size savings or equivalent across formats.

The browser applies supported orientation metadata while decoding, so dimensions describe the oriented image. The export is a newly encoded still image; original metadata, color profiles, bit depth and animation are not preserved as an archival record. Enlarging adds pixels, not new captured detail.

Image resizing examples

A 4000 × 3000 image resized to a width of 1200 pixels with proportions on becomes 1200 × 900. Changing the height to 600 instead gives 800 × 600, calculated from the original ratio.

Resizing a 4000 × 3000 image to 50% gives 2000 × 1500. That is half the width and half the height, not a promise to halve the file size.

With proportions off, a 4000 × 3000 image can become exactly 1200 × 1200, but its contents stretch. With proportions on and width 1200, it remains 1200 × 900. Cropping to a square is a different operation.

What the export changes

This tool handles one JPEG, PNG or WebP file and exports a still image. For animated PNG or WebP, the browser uses the animation's default still image or its first frame. GIF, SVG, HEIC, other formats and animated exports are not supported.

Browser memory, decoders and encoders affect availability, appearance and file size. The output can be larger than the original. The tool does not crop, restore missing detail, set print DPI, preserve original metadata or guarantee a particular upload limit. Keep the original when those properties matter.

Local image processing

The tool reads and processes your selected image in your browser and does not intentionally upload or save it. Download saves the finished image when you request it. Normal site services and consent settings remain separate.