Resize Image — Change Dimensions Online Free
Scale your images to any size by pixels or percentage. Instantly. No sign-up required.
How to resize image
- 1Upload your image file using the drop zone above
- 2Choose a resize mode: by dimensions or by percentage
- 3Enter your desired width, height, or scale percentage
- 4Select an output format and click "Resize Image"
- 5Download your resized image
About This Tool
Whether you need to fit an image into a specific layout, meet upload requirements for a platform, or simply reduce resolution for faster loading, our free online tool lets you resize image files in seconds with full control over the output dimensions.
You can resize by exact pixel dimensions or by a percentage of the original size. The aspect ratio lock ensures your image stays proportional — change one dimension and the other updates automatically. If you need a non-proportional stretch, simply unlock the aspect ratio and type in both values.
The tool supports JPEG, PNG, and WebP output, so you can resize and convert in one step. Because everything runs inside your browser using the Canvas API, your files are never uploaded to a server. This means you can resize image files containing personal photos, client work, or sensitive screenshots with complete privacy.
Combine this tool with our compressor to first resize and then optimize file size, or use it alongside our crop and convert tools for a complete image editing workflow — all free, all in your browser.
Frequently Asked Questions
Downscaling generally preserves visual quality well. Upscaling can introduce blurriness because the browser must interpolate new pixels. For best results when enlarging, keep the scale increase moderate (under 200%).
Yes. The "Maintain aspect ratio" checkbox is on by default. When enabled, changing the width automatically recalculates the height (and vice versa) to keep the original proportions.
There is no hard limit. Performance depends on your browser and device memory. Most images up to 50 MP (e.g., 8000 x 6000 pixels) resize smoothly on modern devices.
No. All processing happens locally in your browser using the Canvas API. Your image never leaves your device, making this tool safe for personal or confidential files.
This tool resizes by pixel dimensions or percentage, not by target file size. To reduce file size, use our Compress Image tool after resizing — the combination gives you precise control over both dimensions and weight.