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Resize images to exact dimensions. Free, private, runs in your browser.
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Image resizing changes the pixel dimensions of an image — making it larger or smaller. Resizing is different from cropping (which removes parts of the image) or compressing (which reduces file size without changing dimensions). When you resize, every pixel in the output is recalculated using interpolation algorithms to maintain visual quality.
Common reasons include meeting upload requirements (social media, forums, job applications), reducing file size for email, preparing images for web design at exact pixel dimensions, creating thumbnails, or adapting photos for print at specific DPI. Oversized images slow down websites and waste bandwidth.
Convertful uses the browser's Canvas API with high-quality bicubic interpolation to resize images. You can specify exact width and height in pixels, lock the aspect ratio to prevent distortion, or enter one dimension and let the other scale proportionally. The output format matches your input — JPG stays JPG, PNG stays PNG.
Yes. Everything runs locally in your browser. Your images are never uploaded to any server. No registration, no watermarks, no data collection. Close the tab and all data is cleared.
Yes. Lock the aspect ratio to resize proportionally, or unlock to set custom dimensions.
You can resize up to 10,000 x 10,000 pixels. For best results, avoid upscaling beyond 2x the original size.