How to Compress Images for the Web Without Visible Quality Loss
The best web-image optimisation combines right-sized pixels with a suitable format and a quality setting tested on real content.
Read guide →Resize Image
Change image dimensions in pixels or by percentage, with an option to preserve the original aspect ratio.
Drop image(s) here or click to browse
Editor & live preview appear below once you add an image.
Reviewed 2026-07-10
About Resize Image
Resizing changes the number of pixels in an image. This tool can fit an image inside a width-and-height box or scale it by a percentage, and it uses high-quality browser canvas resampling.
The full-resolution image is decoded and resized on your device. The browser blocks pathological outputs above 16,384 pixels on one side or roughly 100 megapixels, while lower-memory devices may reach their practical limit earlier.
Supported formats
- JPEG
- PNG
- WebP
- AVIF
- GIF (static frame)
- BMP
- TIFF
- HEIC/HEIF
- SVG (rasterized)
- ICO
- JPEG 2000 (browser-dependent)
How to use it
- Add an image. Choose a supported image and wait for its original dimensions to appear.
- Enter the new size. Resize by pixels or percentage. Keep aspect ratio enabled to avoid stretching.
- Review and export. Check the preview, resize the full-resolution source, and download the resulting PNG.
Useful for
- Reduce camera photos to practical dimensions before email or upload.
- Create a smaller copy for documentation, a profile, or a presentation.
- Scale an asset proportionally without calculating the second dimension.
Limitations
- Upscaling creates more pixels but cannot restore detail that was not present in the source.
- With aspect ratio enabled, pixel dimensions define a bounding box; one resulting dimension may be smaller than the entered value.
- The current tool exports PNG, which may be larger than JPEG or WebP for photographs.
Questions and answers
What does “keep aspect ratio” do?
It keeps the width-to-height proportion of the source, preventing geometric stretching. In pixel mode, the image is fitted inside the requested width and height.
Does resizing reduce file size?
Fewer pixels often help, but file size also depends on format and image content. Since this tool exports PNG, a resized photo is not guaranteed to be smaller than its JPEG source.
Why can a very large resize fail?
Browsers need memory for decoded RGBA pixels, canvases, previews, and encoded output. These allocations can be several times larger than the compressed source file.
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