Resize Images Online
Resize JPG, PNG and WebP images by pixels, percentage or common presets. Process multiple images locally in your browser and download them individually or as a ZIP.
What this tool does
NexKit Resize Image changes image pixel dimensions directly in your browser for supported JPG, PNG, and static WebP files. You can resize by width, height, percentage, or a small set of common preset bounding boxes.
The tool keeps the original image format. JPG stays JPG, PNG stays PNG, and WebP stays WebP. It does not crop, stretch, pad, rotate, or convert images into another format.
How to resize images
Open the Resize Image page, choose one or more supported images, and select Pixels, Percentage, or Presets. In Pixels mode, a single width or height scales the other side proportionally. If both width and height are set, each image is fitted inside that box while keeping its original aspect ratio.
Run resize, then download each successful output or package successful outputs as a ZIP. Images with different proportions use their own original ratio, so a batch may produce different final dimensions from the same preset or bounding box.
Supported formats
This release supports JPG, PNG, and static WebP images. GIF, SVG, HEIC, HEIF, AVIF, TIFF, BMP, and unknown formats are rejected. File type checks use image headers as well as browser metadata, so a fake extension alone is not enough to pass validation.
PNG transparency is preserved through the Canvas workflow. PNG quality settings are not precisely controlled by browser Canvas, so PNG file size mainly changes when dimensions change.
Privacy and local processing
Images are resized locally in your browser for this tool. NexKit does not upload selected images to a server, store image blobs in browser storage, or send file contents to a cloud conversion service for this workflow.
Files remain part of the current browser session. Refreshing or closing the page clears the selected files and generated Blob URLs.
Frequently Asked Questions
Are images uploaded?
No. Resize Image processes supported images locally in your browser. The selected files are not uploaded to NexKit servers by this tool.
Which formats are supported?
This tool supports JPG, PNG, and static WebP images. GIF, SVG, HEIC, AVIF, TIFF, BMP, and unknown formats are rejected.
Does resizing keep the aspect ratio?
Yes. Aspect ratio is always preserved. If both width and height are set, each image is fitted inside that box without cropping, stretching, padding, or adding borders.
Can I resize multiple images?
Yes. You can process multiple supported images with one shared setting. Images with different proportions keep their own proportions and may produce different final dimensions.
Can I enlarge smaller images?
By default, smaller images are not enlarged. You can allow enlargement, but it is limited to 400% and still must stay within target dimension and pixel limits.
Why did the resized file become larger?
Resizing changes pixel dimensions, then the browser re-encodes the image. Depending on format and image content, the output file can be smaller, larger, or about the same size.
Does resizing remove metadata?
Canvas re-encoding usually removes metadata such as EXIF and GPS, but this tool is not a dedicated metadata removal workflow and does not guarantee every metadata case.
Can I download all files as a ZIP?
Yes. The ZIP download includes successful resized outputs only and is generated locally in your browser.