A smaller image. A better fit.
An image can look right and still be inconveniently large. A good starting point is to decide where it will be used, then resize a copy for that job.
Choose the destination first
A small profile image, a document illustration, and a full-width website photograph need different dimensions. Check the receiving site’s requirements if it provides them. If it asks for a square image, resizing alone will not turn a wide photograph into a square: that requires cropping. Daykit preserves the original shape, so use an image editor for a crop before resizing here.
Understand a maximum box
A maximum width and height define a box that the image must fit inside. A 1,600 × 800 image has a 2:1 aspect ratio. Put it in an 800 × 800 box and it becomes 800 × 400, leaving its shape intact. A portrait image will instead be constrained by the height. This prevents the squashed faces and stretched lettering that happen when width and height are forced independently.
Pick a format for the content
Photographs often work well as JPEG or WebP. Logos, diagrams, and screenshots with crisp text may be clearer as PNG, especially when transparency matters. JPEG has no transparency: Daykit uses a white background when converting a transparent image to JPEG. WebP can keep transparent areas, but check whether the destination accepts the format. A format that the recipient cannot open is not a useful saving.
Adjust quality after dimensions
Start by reducing dimensions to the size you actually need. For JPEG or WebP, try a quality around 80, then inspect the result. Look at small text, faces, sharp edges, and smooth gradients. If you see distracting blocks or blurred detail, increase quality or use a different format. A PNG export ignores the lossy quality slider, because PNG compression does not use that setting.
Compare the output with the original
A conversion does not always make a file smaller. An already optimized picture may grow when re-encoded. Daykit shows the original and output sizes so you can compare before downloading. Keep the original file, give the resized copy a meaningful name, and open the downloaded image once to check dimensions and appearance. Do not overwrite your only high-resolution copy.
Know the limits of a browser resizer
This tool creates a still raster image. It does not preserve motion, and it is not an editor for vector artwork, color-managed print production, or layered design files. Files are read and processed locally in the page, with a 20 MB input limit. For a confidential picture, also consider the security of the device, downloads folder, and applications that will receive the finished copy.
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