Resize Image
Change image dimensions without leaving your browser.
Your file stays on this device.
What Resize Image does
Resize Image changes how many pixels a picture has. Your browser decodes the file, draws it at the dimensions you ask for, and encodes the result as JPEG, PNG, or WebP.
You can set an exact width or height in pixels, with an aspect-ratio lock so the other side follows, or scale by percentage when you only want the image to be half or a quarter of what it was.
It also takes a batch. Choose a folder of pictures, set the size once, and every one of them is resized here in turn — each with its own download, and all of them as one ZIP.
When resizing is the right fix
Resize when the image is bigger than the place it is displayed: a 4000-pixel photograph in a 800-pixel column, an avatar that needs to be square, a marketplace listing with a maximum dimension in its rules.
Fewer pixels is also the most effective way to make a file smaller, because it removes data rather than approximating it. Resize first and compress afterwards if the file still needs to shrink; the two can run back to back in Gizlet Flows.
What each control changes
- Exact dimensions
- Type a width or a height in whole pixels. With the aspect-ratio lock on, the other side is worked out for you and the picture is never stretched. Turn the lock off to set both sides and accept the distortion.
- Percentage
- Scale relative to the original, from 0.1% to 1000%. 50% halves both sides, which is the quickest way to cut a screenshot from a high-density display down to size.
- Output format
- JPEG for photographs, WebP for the web, PNG when you need lossless pixels or transparency. Resizing a photograph into PNG can easily produce a larger file than the original.
- Several images at once
- Up to 25 in one batch. A percentage means the same thing to every picture already; an exact size does not, so with the lock on the width is the instruction and each picture works out its own height, and with the lock off every picture is forced to the same box — which is what a set of thumbnails wants. The note under the fields says which of those is about to happen.
- Limits
- Each side can be up to 16,384 pixels and the result up to 40 million pixels. Anything larger is refused with an explanation instead of a failed download, and results above roughly 16 megapixels are flagged as a big image before you commit to them. A batch is held to 320 million pixels in total, because the work is sequential rather than simultaneous.
No upload, no queue
The picture is decoded, redrawn, and encoded here in this browser, and the resized file goes straight to your downloads. Gizlet has no upload endpoint and keeps nothing once the tab is closed.
Because the output is drawn fresh onto a canvas, it also arrives without the metadata the original carried, including camera details and any GPS coordinates.
Common questions about Resize Image
Will resizing make my image blurry?
Making an image smaller is safe; the browser averages pixels away and the result stays sharp. Making one larger cannot invent detail that was never captured, so anything much above 100% will look soft.
How do I resize without stretching the picture?
Leave the aspect-ratio lock on, which it is by default, and set only one side. The other is calculated from the original proportions. Percentage mode always keeps the proportions.
What is the largest image I can resize?
Up to 16,384 pixels on a side and 40 million pixels in the result. Beyond that the Gizlet explains the limit instead of attempting it, and very large images may still be limited by your own device memory.
Why is my resized file larger than the original?
Almost always the output format. A photograph encoded as PNG stores every pixel exactly and can outweigh a much bigger JPEG. Choose JPEG or WebP for photographs, and use Compress Image if the size still needs work.
Does the image leave my device?
No. The file is read and rewritten by this browser only. There is no upload, no queue, and no copy kept anywhere.