Re:SIZER
Intuitively adjust to the perfect ratio for social media and the web.
JPG, PNG, WEBP (Max 20MB)
* Drag inside the frame to move. Use mouse wheel or pinch to zoom in/out.
Resize Images -- No Registration or Installation
Re:SIZER is a free image resize and crop tool that works entirely in your browser. No app installation or account registration is needed. Anyone can start using it instantly on PC or mobile. Simply select an image and specify the aspect ratio to quickly adjust it to the size you need.
In-Browser Processing with High Quality
All image processing is performed on your device (in the browser). Your image data is never sent to an external server. The algorithm minimizes quality loss, delivering clean results. * External fonts and similar resources may be loaded for page display.
Optimized Aspect Ratios for Social Media
Preset ratios are available for major social media and web platforms, including Instagram (1:1, 4:5), Twitter/X (16:9), and YouTube thumbnails. You can also enter custom values for any ratio you need. Both portrait and landscape images are supported.
Simple 3-Step Process
1. Drag and drop or click to select the image you want to resize (JPG / PNG / WebP, up to 20MB).
2. Choose a ratio from the presets, or enter custom values. Drag the frame to adjust the crop area.
3. Press the "Save Image" button to download. On PC it saves automatically; on mobile, long-press the image to save.
Ideal Use Cases
Social media images: Easily create images in the recommended sizes for Instagram feed posts (1:1), Stories (9:16), Twitter/X headers (16:9), and more.
YouTube thumbnails: Accurately crop 16:9 thumbnail images while checking the subject position.
Blog & website images: Convenient for adjusting featured images and banners to match your site's design ratios.
Presentation materials: Resize images to fit your slide layouts.
Profile pictures: Crop to a 1:1 square to create social media profile icons.
Operation Guide
Move the area: Drag inside the crop frame to change the crop position.
Resize the area: Drag the corners or edges of the frame to freely resize the crop area.
Zoom in/out: Use the mouse wheel on PC or pinch gesture on mobile to zoom. Useful for fine-tuning the subject position.
Change ratio: Simply click a preset button to instantly change the crop frame's aspect ratio. Select "Free" to crop at any ratio.
Frequently Asked Questions (FAQ)
Q. Will the image quality degrade?
A. The crop maintains the original image resolution, so the quality within the cropped area is preserved. Images are saved in PNG format, so there is no degradation from recompression.
Q. Can I use it on mobile?
A. Yes. You can use it directly from iPhone / Android browsers (Safari, Chrome, etc.). Touch-based area selection and pinch-to-zoom are fully supported.
Q. What image formats are supported?
A. JPG, PNG, and WebP formats are supported. Maximum file size is 20MB.
Q. Can I process multiple images at once?
A. Re:SIZER is designed for carefully adjusting the crop position of one image at a time. For batch processing, consider using our sister tool "BUN≡KATSU."