Image Resizer
Resize images to new pixel dimensions locally in your browser without uploading the source file to a server.
Image Resizer online
Resize an image to the dimensions or scale you need and save it as JPEG, PNG or WebP — the pixel-size counterpart to the quality tools.
How to use this tool
- Choose an image. Its current dimensions are shown.
- Enter the target width (the height follows the aspect ratio) or set your size directly.
- Pick the output format — Original keeps the source format, or convert while resizing — and download.
Common uses
Shrinking a photo for an upload limit or an email, producing an image at a CMS's exact slot size, generating a smaller variant for a thumbnail, and converting format while you are at it (a PNG screenshot out as a compact JPEG).
How it works
Resizing resamples the image on a canvas: the browser scales the pixels to the new dimensions and encodes the result in the format you chose. Downscaling is where the tool earns its keep — an image shown at 800 px wide gains nothing from being 4000 px and 6 MB. Upscaling is allowed but only interpolates: it makes a bigger file, not a sharper image, because no new detail exists to invent. Format conversion rides along: PNG keeps transparency, JPEG drops it (transparent areas become background), WebP usually wins on size for photos.
Worked example
A 4000×3000 camera JPEG at 6.2 MB, destined for a blog slot 1200 px wide: resize to 1200×900 as JPEG and the result lands around 300–450 KB depending on content — a 93% reduction with no visible loss at display size. The same image exported as WebP typically saves a further quarter. Email the original to a mailing list of ten thousand and the resize just saved your readers about 58 GB of aggregate downloads.
Privacy and browser processing
Your image is resized in your browser on a local canvas — it is never uploaded or stored.
Frequently asked questions
Should I resize before or after cropping?
Crop first for content (you want the full-resolution choice of what to keep), then resize the crop to the delivery size. Reversing the order wastes pixels on areas you are about to discard.
Why does the resized image look softer?
At 1:1 pixel viewing, resampling averages neighbouring pixels, so a downscale viewed zoomed-in looks softer than the original. At its intended display size — the size you resized to — it will look correct. Judge it at 100% of its target size, not zoomed.
What happens to transparency with JPEG output?
JPEG has no alpha channel; transparent pixels are composited onto a background (typically white or black depending on the pipeline). For logos and UI assets with transparency, choose PNG or WebP output.
Does resizing strip metadata?
The output is a fresh canvas encode, so EXIF data (camera, GPS, timestamps) does not survive. That is a privacy benefit for sharing, and a reason to keep your originals archived separately.
Is my image uploaded?
No. Resizing happens on a canvas in your browser; the image never leaves your device.