Resize Image
Change image dimensions with precise control
Updated · Guide: How to Resize Images Without Losing Quality: A Guide
Processed on our server. Sent over HTTPS to an isolated job, then deleted once you download.
Drop an image here
JPG, PNG, WebP, AVIF, TIFF, GIF, BMP, HEIC
Max 50 MB
Dimensions (px)
The aspect ratio locks to your image once it is added.
Fit mode
Add an image to start
Up to 50 MB per file
No daily limit and no watermark on the result.
No account needed
Free to use. No signup, no email, no trial.
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 on our server at full quality.
Download the resized image
Click Download to save the resized image. The format is preserved from the original.
What is image resizing?
Scale images to any width and height by exact pixels or percentage. Lock the aspect ratio to prevent distortion. See our processing model for details on how this tool handles your files.
Resizing an image means changing its width and height in pixels. 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 on our server using the sharp image library, and files are deleted right after download. 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 resamples with sharp, which uses the Lanczos3 kernel by default. When downscaling, this produces sharp, well-antialiased output. The tool never enlarges an image beyond its original dimensions, because upscaling would have to infer pixel data that does not exist in the source. 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 upload and process.
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, which is why this tool never enlarges beyond the original size. To maintain quality, 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.
Related tools
Related guides
How to Resize Images Without Losing Quality: A Guide
Learn how to resize images while preserving sharpness, covering resampling algorithms, aspect ratio, DPI versus pixel dimensions, and the limits of upscaling.
How to Optimize Images for Website Performance
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Image Compression Settings: Quality, Resizing, and Format Quirks
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JPG vs PNG vs WebP vs AVIF: Which Image Format to Use
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Lossy vs Lossless Compression: When to Use Each
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