Image Resizer — Resize Images in Your Browser
Resize uploaded images using the HTML5 Canvas API. Set custom width and height, lock aspect ratio, and download the result — all locally, no uploads.
Upload Image
Resize Controls
Frequently Asked Questions
- No. All resizing happens entirely in your browser using the Canvas API. Your image never leaves your device.
- PNG, JPG, and WebP images are supported. Drag and drop an image or click the drop zone to browse.
- When enabled, changing one dimension automatically updates the other to preserve the original aspect ratio.
- Yes. Once the page is loaded, the tool works offline because all logic runs client-side.
Use Cases
Resize images in your browser for social media posts, website headers, email attachments, and profile pictures without uploading anything to a third-party server. Designers batch-resize photos for portfolios, developers optimize assets for faster page loads, and marketers prepare images for ad campaigns. Students compress project screenshots for submissions, while small business owners prepare product photos for online stores. Bloggers scale featured images to match theme dimensions, and job seekers resize headshots for resumes and LinkedIn profiles. Photographers downsize high-resolution shots for quick client previews, and teachers reduce worksheet graphics for digital handouts. E-commerce sellers resize catalog images to meet marketplace requirements, and event organizers shrink photos for online galleries and invitations. It also supports quick format conversion, letting you switch between PNG and JPEG while resizing in a single step. Because processing happens entirely on your device, your files stay private and no internet bandwidth is wasted sending large originals to the cloud. Client data never leaves your machine, making this approach safer than cloud-based converters for sensitive or confidential imagery.
How-To
Open the Image Resizer tool, drag and drop or select an image file from your device, then enter your target width or height in pixels. Choose whether to maintain the aspect ratio so the image does not stretch or distort, pick an output format such as PNG or JPEG, and adjust quality if needed. Click Resize, preview the result, and download the resized image instantly to your downloads folder.
- Select or drag an image into the tool
- Enter the target width or height in pixels
- Enable maintain aspect ratio to keep proportions
- Choose PNG or JPEG as the output format
- Click Resize, preview, and download the result
The resized image is created entirely in your browser, so nothing is uploaded or stored on external servers. Use it for faster website performance, smaller email attachments, and platform-specific dimensions across Instagram, LinkedIn, X, and Facebook without installing desktop software. Ideal for anyone who needs quick, private image resizing on demand, from one-off edits to repeated production batches. It works offline after the page loads, so you can resize images anywhere without depending on an internet connection or a subscription. No account is required, there are no file size limits imposed by a remote service, and you can process as many images as you need in one session.