Image Resizer
Resize images by pixels or percentage while maintaining aspect ratio.
Drag & Drop Your Images Here
Supports .jpg, .jpeg, .png, .webp, .gif files up to 50MB
Browse From DeviceFiles never leave your device. All processing happens locally in your browser.
Supported Formats: All common image formatsMaximum File Size: 50 MB
Savings vary by image and quality setting — lossy compression and modern formats like WebP shrink photos dramatically.
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Why Resize Images?
A 4000×3000 phone photo is overkill for a 800px-wide blog column — those extra pixels cost bandwidth and slow every page load. Resizing changes an image's pixel dimensions to match its actual display size, often cutting file weight by 90%+. With aspect ratio locking, your images never stretch or squash.
- ✓Exact pixel control: set precise width × height for any requirement
- ✓Percentage scaling: shrink by % — 50% for quick halves, 25% for thumbnails
- ✓Aspect ratio lock: locked proportions prevent stretched, distorted images
- ✓Format preserved: output keeps the input format — JPG stays JPG
Resizing Down vs Resizing Up
Direction matters enormously — one is safe, the other is a compromise.
How to Resize Images in 3 Steps
Add Your Images
Drag and drop JPG, PNG, WebP, or GIF files into the upload zone, or click to browse. Files up to 50MB each are supported.
Set Dimensions
Enter target width and height in pixels, or switch to percentage mode. Keep Lock Aspect Ratio checked to avoid distortion.
Download Resized Files
Download individually or as a ZIP archive. Each image is resampled cleanly to its new size.
When Should You Resize Images?
Resize when the display size is smaller than the file: 4K phone photos for blog posts, screenshots for documentation, product images for listings, profile pictures, and thumbnails of any kind. Common targets: 1920px wide for full-width heroes, 800–1200px for article images, 150–300px for thumbnails. Always resize before compressing for maximum savings.
Key insight: Downsizing is mathematically safe — averaging 4 pixels into 1 preserves all visible detail. Upsizing is the opposite: the resampler must invent pixels via interpolation (bilinear/bicubic guessing), so a 500px image enlarged to 2000px just looks like a blurry 500px image. Rule of thumb: never upscale beyond 2×, and prefer dedicated AI upscalers for that job.
Will Resizing Reduce Quality?
Downsizing to a sensible target: no visible loss — you're discarding pixels the display couldn't show anyway. But keep your originals: once pixels are gone, they can't come back. If you later need a larger version, you'll want the full-resolution source. Think of resizing as a one-way delivery optimization, not an edit.
Related: After resizing, squeeze files further with the image compressor. Need a different format too? Try JPG to WebP.
Rasterizing vectors? Our SVG to PNG converter sets exact dimensions.
Frequently Asked Questions
Match the display size: 1920px for full-width heroes, 800–1200px for article images, 150–400px for thumbnails. For retina sharpness, export at 2× the CSS size (a 400px-wide slot gets an 800px image).
Not with Lock Aspect Ratio enabled (it is by default) — width and height scale together proportionally. Distortion only happens if you force mismatched dimensions with the lock off.
Pixels when you have an exact target (social media specs, thumbnails). Percentage for quick proportional shrinks — 50% halves both dimensions, quartering the pixel count.
No — output keeps the input format (JPG→JPG, PNG→PNG). To change formats, use a dedicated converter after resizing.
No. Resampling happens entirely in your browser — files never leave your device.
Yes — set dimensions once and apply to a whole batch, then download a ZIP. Ideal for standardizing a photo set to uniform sizes.