Image Resizer

Resize images free online with Image Resizer. Browser-based, no signup, no installation — instant results for designers.

Image Resizer is a browser-based tool for changing image dimensions without opening desktop editing software. You can upload one or more files, set a custom width and height, decide whether to keep the original aspect ratio, preview the output, and download the resized files together as a ZIP archive. That makes it useful for fast website publishing, email attachments, marketplace uploads, content management systems, and social media workflows where exact pixel dimensions matter. This tool is especially practical when you already know the target size you need. For example, a CMS might require a featured image under a certain width, an ecommerce platform may recommend square product photos, or a designer may need consistent thumbnail dimensions across a gallery. Instead of opening each file in a full editor, you can drop the images here, set the target size once, and process the batch in one run. The aspect-ratio lock matters because resizing is not always the same as cropping. If you keep the ratio locked, the tool updates one dimension based on the original proportions of the first uploaded image, which helps avoid stretched faces, distorted screenshots, or warped logos. If you unlock the ratio, you can force exact dimensions, but that is best reserved for cases where visual stretching is acceptable or the source already fits the target shape. All processing happens in the browser using canvas-based resizing, so the original files are not uploaded to a remote server during the resize workflow. That makes the tool a practical choice for routine internal assets, client visuals, screenshots, and other files you would rather process locally. If your goal is file-size reduction rather than pixel-dimension changes, pair this tool with Image Compression. Resizing is best when you need exact width and height control; compression is better when the dimensions can stay the same but the file still needs to become lighter.

• Custom width and height controls. Enter exact pixel dimensions so you can prepare assets for CMS image slots, ad formats, thumbnails, or fixed-layout design systems.
• Aspect-ratio lock. Keep proportions tied together to avoid stretched images when you only want to change one side of the asset.
• Batch processing with ZIP download. Resize multiple files in one run and download the output as a single ZIP instead of exporting images one by one.
• Side-by-side preview workflow. Compare the original image with the resized preview before downloading so it is easier to catch distortion or poor sizing choices.
• Browser-based resizing. The resize flow runs locally in the browser, which is useful when you do not want to upload everyday working files to a third-party service.

• Preparing featured images for a CMS. Resize oversized uploads to match blog, landing page, or documentation image requirements before publishing.
• Standardizing ecommerce product images. Create consistent product card dimensions so catalog pages look cleaner and more professional.
• Generating social media variants. Resize the same source image for square posts, story graphics, profile visuals, or ad placements with less repetitive editing.
• Shrinking screenshots for email or docs. Reduce oversized screenshots to something easier to share in support tickets, reports, or team documentation.

1. Upload one or more images — Drag files into the dropzone or select them manually. The tool accepts general image formats and builds a preview list automatically.
2. Set your target dimensions — Enter the width and height you want for the exported images. If you are resizing for a platform, use that platform's recommended pixel dimensions.
3. Choose whether to lock proportions — Leave aspect ratio locked to preserve the original shape, or unlock it if you intentionally need forced dimensions.
4. Run the resize job — Click the resize button and let the tool process each file. Progress updates as every image is completed.
5. Download the ZIP and spot-check output — Open the downloaded ZIP and verify a few files before publishing, especially if you changed aspect ratio or used unusual target dimensions.