Resize Image
Change image dimensions with precise control
Scale images to any width and height by exact pixels or percentage. Lock the aspect ratio to prevent distortion. See our [processing model](/processing-model) for details on how this tool handles your files.
How to use Resize Image
Upload your image
Click the upload area or drag and drop a JPG, PNG, WebP, or other image file.
Enter target dimensions
Type the desired width and height in pixels. Toggle 'Lock aspect ratio' to prevent distortion.
Click Resize
The image is resized instantly in your browser at full quality.
Download the resized image
Click Download to save the resized image. The format is preserved from the original.
Drop an image here
JPG, PNG, WebP, AVIF, TIFF, GIF, BMP, HEIC
Max 50 MB
What is image resizing?
Every upload field has an opinion about dimensions. Resize Image gets a file to the exact width and height you need, by pixel count or by percentage, without opening an editor.
The tool runs entirely client-side using the Canvas API. You can resize by exact pixel dimensions, by percentage, or constrain proportions to avoid distortion.
Platform specs are the usual reason. Instagram posts want 1080x1080, Facebook covers 820x312, LinkedIn banners 1584x396, YouTube thumbnails 1280x720, and most marketplaces want every product photo at identical dimensions so the listing grid does not jump. Responsive design adds another set, with assets cut to match breakpoints rather than to match a platform. If the file format needs changing too, run Convert Image afterwards to land on the best encoding for the target.
The tool uses browser-native Canvas API resampling, which applies bilinear interpolation by default for smooth results. When downscaling, this produces sharp, well-antialiased output. When upscaling beyond the original resolution, some softness is unavoidable because the algorithm must infer pixel data that does not exist in the source. For the sharpest results, avoid upscaling beyond 150% of the original dimensions. If your image needs both cropping and resizing, use Crop Image first to select the region of interest, then resize the cropped result to your target dimensions — this preserves more detail than resizing the full image and cropping afterward. For further reading, see our image optimization guide.
Frequently asked questions
Can I resize an image without distorting it?
Yes. Enable the 'Lock aspect ratio' option and the tool will automatically adjust the height when you enter a width (or vice versa), maintaining the original proportions.
What image formats are supported?
The resize tool supports JPG, PNG, WebP, GIF, BMP, and most other common image formats. The output format matches the input unless you use the Convert Image tool to change it.
Is there a maximum file size?
The tool handles images up to 50 MB. Very large images may take a moment to process in the browser.
How do I resize an image to a specific file size?
This tool resizes by pixel dimensions, not file size. To reach a target file size (e.g., under 2 MB for an upload form), resize to smaller dimensions first, then use Compress Image to fine-tune the file size with the quality slider. Lower quality and smaller dimensions together give the most reduction.
What dimensions should I use for social media images?
Common social media image sizes include: Instagram post 1080x1080, Instagram story 1080x1920, Facebook post 1200x630, Facebook cover 820x312, Twitter/X post 1200x675, LinkedIn banner 1584x396, and YouTube thumbnail 1280x720. Always lock the aspect ratio and enter the width first — the height will adjust automatically to prevent distortion.
How do I resize an image without losing quality?
Downscaling (making an image smaller) preserves quality well because the algorithm averages existing pixel data. Upscaling (making it larger) always reduces sharpness because new pixels must be interpolated. To maintain quality, never upscale beyond the original resolution, keep the aspect ratio locked to prevent distortion, and use PNG format for graphics with sharp edges or text. For photos, JPG or WebP at quality 85+ will look identical to the original at any reduced size.
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