Resize JPG Images Online for Free
Resize your JPG and JPEG photos to any dimension with quality control. Set custom sizes, scale by percentage, or use social-media presets. All processing happens in your browser — your photos stay private.
Why Resize JPG with ImageSizr?
JPG is the most widely used photo format on the web and in digital cameras. ImageSizr.com handles it natively, letting you resize large camera photos down to web-friendly dimensions without opening desktop software.
The quality slider gives you precise control over the balance between visual fidelity and file size. Set it higher for crisp output or lower for smaller files — the choice is yours.
When converting from a format with transparency to JPEG, choose a background colour to fill transparent areas. White is the default, or pick any custom colour.
All Resize Options Available
Enter custom width and height in pixels, centimetres, inches, or millimetres — non-pixel units convert automatically using 96 DPI. Scale by percentage with quick presets at 25%, 50%, and 75%.
Choose from social-media presets for Instagram, Facebook, Twitter/X, and YouTube to hit exact platform dimensions. Or pick a device preset ranging from HD to 4K, plus specific phones, tablets, and laptops.
Enable aspect-ratio lock to maintain proportions when changing one dimension. Disable it for independent width and height control.
Convert or Keep JPG
Export as JPEG with adjustable quality for optimal file size — this is the default output for JPG files. A quality setting of 80% or higher generally produces excellent results with minimal visible difference.
Need a different format? Convert to PNG for lossless quality when further editing is planned, WebP for modern web optimization with smaller file sizes, or ICO to generate icon bundles with sizes from 16 to 256 px.
Related Tools
- Resize any image format — the general-purpose resizer for all file types.
- Batch resize multiple images — upload up to 5 JPGs and resize them all with shared settings.
- Crop images to a specific region — select the exact area you want to keep.
- Compress images to reduce file size — especially useful for optimizing JPG photos for the web.
Browse our image guides and tutorials for more tips on working with photos.
Learn More
Frequently Asked Questions
Is ImageSizr free to use?
Yes. ImageSizr is completely free with no account or sign-up required.
Are my images uploaded to a server?
No. All processing happens directly in your browser. Your images never leave your device, so your data stays private.
Will resizing my JPG reduce the quality?
Resizing itself does not add compression artefacts. When you export as JPEG, use the quality slider to control the trade-off between visual fidelity and file size. A setting of 80% or higher generally produces excellent results.
How to resize a JPG image?
1. Upload your JPG file using drag-and-drop, browse, clipboard paste, URL, or cloud storage. 2. In the editor, enter new dimensions, use the percentage slider, or pick a preset. 3. Click Download to save the resized JPG.
Can I resize to exact social-media dimensions?
Yes. Switch to the Social Media resize mode and choose a platform (Instagram, Facebook, Twitter/X, or YouTube), then select the specific preset such as Profile Picture, Cover Photo, Story, or Thumbnail.
What units can I use for dimensions?
You can enter dimensions in pixels (px), centimetres (cm), inches (inch), or millimetres (mm). Non-pixel units are converted automatically using 96 DPI.
How do I keep the original proportions?
Enable the Lock Aspect Ratio option. When locked, changing one dimension automatically adjusts the other to maintain the original proportions.
Can I convert my JPG to another format while resizing?
Yes. Use the Format dropdown in the editor to switch between JPEG, PNG, WebP, or ICO before downloading.
What is the maximum file size?
Each file can be up to 10 MB.