How to use Image Resize & Crop

Image Resize & Crop belongs to the image tools on KivTools. The workbench above handles the whole job on one screen: files chosen from your device, then a rendered image.

The conversion runs inside the page with browser JavaScript. Nothing you enter is uploaded, the tool keeps working offline, and it is safe for data you are not allowed to send to a third party.

  1. Choose the option that matches your case in the selector: Fit inside, Fill and crop, Stretch.
  2. Select the file to process with the file picker above.
  3. Press Process files to generate the result.
  4. Press Clear to reset the form before the next run.
  5. Check the result against a second source before you rely on it in production.

Background and accuracy

Image tools

Binary formats carry more than the content you see: metadata, colour profiles, embedded fonts and, in practice, a fair amount of information you did not intend to publish. These tools transform or inspect a file while keeping the payload intact.

Two traps dominate: quality lost through repeated re-encoding, and metadata left in place after an edit. Compress once from the original, and inspect what the file still declares about you before sharing it.

Getting reliable results

Browsers, desktop tools and command-line utilities should agree on the result; a mismatch usually means a different encoding, locale or version. Open the result in a viewer you trust and check size, dimensions and, where it matters, the metadata panel rather than the file name.

Some formats are containers for other formats, so the extension alone does not tell you what is inside; when a system rejects a file, look at the actual header bytes before renaming it. Keep a copy of the input while you experiment, so a wrong setting never destroys the source.

Practical details

Input & output

Accepts a single local image file (JPEG, PNG, or WebP); outputs a resized or cropped image in the chosen format and quality.

Common uses

Prepare images for web layouts that require exact dimensions. Generate thumbnails or social media covers with cover-crop. Convert images for app assets requiring pixel-perfect size.

Processing & privacy

The selected image plus resize, crop, and dimension settings are processed in browser JavaScript and are not uploaded to KivTools.

Limits & compatibility

Works only with one image at a time in a modern browser that supports Canvas image processing; very large images may exceed browser memory.

Frequently asked questions

Is Image Resize & Crop free to use?

Yes. Every tool on KivTools is free, needs no account and has no usage quota. There is no paid tier hiding behind the workbench, and no email address is required to use the result.

Where is my data processed?

Inside your browser. The page loads a script once and the conversion happens on your machine, which is also why the tool still works when the network drops.

What can I feed into Image Resize & Crop?

Accepts a single local image file (JPEG, PNG, or WebP); outputs a resized or cropped image in the chosen format and quality. Large inputs are usually handled without trouble, but extremely large ones are better processed in a local command-line tool.

How accurate is the result?

Dimensions decide file size more than the quality slider does. Compare a small known-good sample first when the output feeds an automated pipeline.

Can I use the output commercially?

The output is yours: no watermark, no licence tag, no attribution requirement. Check the underlying format or library licence when the result ships in a product.

Does it work on mobile and offline?

The page works in any modern mobile browser, and the layout collapses to a single column on small screens. Local tools keep working offline once the page has loaded.

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