Image
Resize Image
- Browser-based
- No signup
- Stays on your device
- Your file is processed in your browser and is not uploaded to our servers.
Browser-based
Upload a JPG, PNG, WebP, or GIF and resize it by exact width and height or by percentage. Lock aspect ratio to avoid stretching, choose an output format, and adjust quality for JPG and WebP. Resizing runs entirely in your browser—files are not uploaded to a server.
Upscaling cannot recover detail that was not in the original image. Extreme aspect-ratio changes may crop or distort if not constrained.
What to do next
How to use this tool
1. Choose an image or drag it onto the upload area. 2. Select resize by width and height or by percentage. 3. Enter the target size; keep Lock aspect ratio checked to preserve proportions. 4. Choose an output format and adjust quality for JPG or WebP if shown. 5. Click Resize image, preview the result, and download the resized file.
Worked example
Example: resize a 4000×3000 photo to 1200 px wide with aspect ratio locked—the height scales automatically and you download a smaller JPG ready for web use.
How it works
Upload a JPG, PNG, WebP, or GIF image, choose new dimensions or a scale percentage, and download the resized file. Aspect ratio can be locked, and you can keep the original format or export as JPG, PNG, or WebP. Resizing runs entirely in your browser—files are not uploaded to a server.
Limitations
Upscaling cannot recover detail that was not in the original image. Extreme aspect-ratio changes may crop or distort if not constrained.
Privacy and file handling
Your data is processed in your browser and is not uploaded to our server.
Frequently asked questions
Are my images uploaded to a server?
No. Resizing runs entirely in your browser. Files are not uploaded or stored by Utilnivo.
Which image formats are supported?
You can upload JPG, PNG, WebP, or GIF. Output can stay the same format, or you can export as JPG, PNG, or WebP. Animated GIFs become a single still frame.
What does lock aspect ratio do?
When enabled, changing width automatically updates height (and vice versa) so the image is not stretched.
Part of these workflows
This tool is one step in a longer job. Follow a workflow guide to see what to do before and after.
Related tools
Related pages
- Resize images — compare image tools and read FAQs
- Optimize images for a website — step-by-step workflow
- Image Compressor — Compress after resizing
- Image Format Converter — Export to WebP or PNG
- Crop Image — Crop before resizing for social
- Browse all free online tools on Utilnivo
- Explore more image tools on Utilnivo
- Aspect Ratio Calculator — Simplify width and height into an aspect ratio.
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