Choose exact pixels, scale proportionally, or start with a preset, then compare the result and export it directly from your browser.
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Image Resizer gives you three ways to set the result. Use Pixels when a website, marketplace, or content system requires an exact width and height. Use Percentage when you want to scale the whole image proportionally. Use Preset for common targets such as an Instagram post, Instagram story, YouTube thumbnail, website banner, or profile picture.
The aspect-ratio lock helps prevent accidental stretching. In Pixels mode, changing the width can automatically calculate the matching height, and changing the height can calculate the matching width. Percentage mode remains proportional automatically. If you deliberately unlock the ratio and enter dimensions with a different shape, the full image is stretched to fit those dimensions rather than cropped.
The Do not enlarge option is enabled by default. It prevents the output from exceeding the source image dimensions, which is helpful because making a raster image larger cannot recreate detail that was never captured. You can disable the option when larger dimensions are required, but the result may look softer or more pixelated.
Export the resized image in its original supported format or choose JPEG, PNG, or WebP. PNG and WebP can preserve transparent areas, while JPEG replaces transparency with white. The current JPEG and WebP exports use a fixed encoder-quality setting and do not provide a quality slider.
The tool processes one JPG, PNG, or WebP image at a time, with a maximum file size of 20 MB. Resizing and export use browser image and canvas APIs, so the image file is not uploaded for processing. Very large source dimensions can still require substantial browser memory even when the compressed file is under 20 MB.
Typical tasks this tool is built for.
Image decoding, resizing, and export run locally in your browser. Your image file is not uploaded for resizing. DevToolKit may receive usage and diagnostic metadata, such as the selected mode, output format, dimensions, and byte counts, but the identified resize analytics do not include the raw image.
Practical tips before you download or share the output.
Image Resizer scales the entire frame and does not crop it. Keep the aspect-ratio lock enabled to avoid stretching, and keep Do not enlarge enabled unless larger dimensions are essential. Resizing cannot restore missing detail. Use Image Crop to change framing and Image Compressor when the main goal is a smaller file size.
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Convert one supported image at a time, review transparency and dimensions, then test the exported file in the destination that needs it.
Common next steps after using this tool.
Compress a JPG, PNG, WebP, or AVIF image with format, quality, and optional resize controls.
Build one ordered PDF from mixed supported image formats, with one ready image on each page.
Remove an image background, review the cutout, refine its edge softness, and export it with transparency or a new background.
Turn one or more JPG and JPEG photos into a single ordered PDF with one image per page.
Select a rectangular region from one JPG, PNG, or WebP with aspect presets, pixel coordinates, and format-aware export.
Rotate one JPG, PNG, or WebP in 90° steps or mirror it horizontally and vertically, then export a new copy in the source format.
Situations where this workflow saves time.
No image file is uploaded for resizing. Decoding, scaling, and export happen locally in your browser. DevToolKit may receive usage and diagnostic metadata such as the selected mode, format, dimensions, and byte counts, but the identified resize analytics do not include the raw image.
No. Image Resizer currently processes one JPG, PNG, or WebP image at a time. Complete or reset the current workflow before choosing another image.
Use Pixels when you have an exact width and height requirement. Use Percentage to scale the full image proportionally. Use Preset when you want a quick starting size for a social post, story, thumbnail, banner, or profile image.
When enabled, the output is capped so it does not exceed the source dimensions. This avoids creating a larger raster image that may appear softer or more pixelated. The option is enabled by default.
Stretching can occur when the aspect-ratio lock is disabled and the target width and height use a different shape from the source. Enable the lock or use Percentage mode to preserve the original proportions.
No. Smaller pixel dimensions often help, but file size also depends on image detail, output format, transparency, and encoder settings. Use Image Compressor when a lower byte size is the main requirement.
Use PNG or WebP when transparent areas must be preserved. JPEG does not support transparency here and fills transparent pixels with white.
Not in the current Image Resizer interface. JPEG and WebP use a fixed encoder-quality setting. Use Image Compressor afterward if you need direct control over the quality and file-size tradeoff.
Resizing can produce larger pixel dimensions, but it cannot recreate missing detail. Enlarged raster images may appear soft or pixelated, which is why Do not enlarge is enabled by default.
No. It scales the full image frame. Use Image Crop to change framing and Image Rotate & Flip to change orientation before or after resizing.
They are not guaranteed to be preserved. The result is re-encoded as a still image through browser canvas, and the implementation does not explicitly copy animation frames or original EXIF metadata.
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