Resize image online

What is this tool?

Change an image’s pixel dimensions while preserving its aspect ratio. Use it to prepare an image for a web page, form or document with a width requirement. Pixel dimensions and compressed byte size are different properties.

How to use it

1. Read the input labels and limits below, then choose the operation that matches your task.
2. Choose an image and wait for it to load.
3. Enter the desired width and choose the available output format.
4. Resize, then open the download to check dimensions and appearance.
5. Check the result against the worked example or original file before copying, downloading or using it elsewhere.

Worked example

Reducing a 4,000-pixel-wide image to a smaller web width can remove unnecessary pixels. Enlarging a small source cannot recreate missing detail. Keep the original so you can export another size later without repeatedly editing a reduced copy.

Questions & limits

How to use image resizer

Choose an image, enter a target width and select an output format. The tool keeps the original aspect ratio and shows the resulting dimensions. JPEG quality controls compression; PNG ignores that setting. Resizing uses the browser’s canvas renderer.

A practical example

A 2400 × 1600 image resized to 1200 pixels wide becomes 1200 × 800. Smaller dimensions usually reduce file size, but compression and image content also matter.

Know the limits

Maximum input size is 20 MB and maximum pixel count is 25 million. Animation and most metadata are not preserved. Transparent areas become white in JPEG. For color-critical work, use a dedicated image editor.

Tool documentation updated October 4, 2026.

Will a resized image keep its proportions?

The new height follows the original aspect ratio. Review the exported image before replacing the source. Resizing cannot recover detail that was absent from the original.

Does a pixel width determine print size?

Not by itself. Printed size also depends on the intended pixel density. Check the printer or document requirements instead of assuming a web-sized image will print sharply.

Before sharing the result

Keep the source file until you have opened the downloaded copy and checked every important page or image. Confirm that names, dates and small text are readable. A successful download only means a file was created; it does not prove that every visual or interactive feature survived the chosen operation. For an upload portal, check its actual file-type, page-count and size requirements. If processing fails on a large file, try a smaller source or close other memory-heavy tabs.