No uploads. No servers. No tracking.
Resize images
to any dimension.
Set a target width, exact dimensions, or scale by percentage. Batch resize with aspect ratio lock. Everything stays on your device.
Drop images here or click to select
JPG, PNG, WebP · Max 20MB each
Set dimensions
Choose width, exact dimensions, or a percentage. Lock aspect ratio to avoid distortion.
Drop your files
Drag images or tap to pick. Resizing starts instantly.
Download
Grab files individually or as a ZIP. Nothing was ever uploaded.
Resize modes
By width (auto height), exact dimensions, or percentage scaling. Upscale or downscale.
Aspect ratio
Lock aspect ratio to prevent distortion, or unlock for custom crops and stretches.
Privacy
Resizing uses the Canvas API in your browser. Zero network requests. Verify in DevTools.
Why resize images?
Modern smartphone cameras capture images at resolutions far beyond what most screens can display. A typical iPhone photo is 4032 x 3024 pixels (12 megapixels), but a website hero image only needs to be around 1200–1600 pixels wide. Serving the full-resolution image wastes bandwidth, slows down page loads, and forces the browser to downscale on the fly — all without any visible quality improvement.
Resizing images to their actual display dimensions is one of the simplest and most impactful performance optimizations you can make. A 4032-pixel-wide JPG might weigh 3 MB; resize it to 1200 pixels and it drops to under 300 KB — a 90% reduction with no perceptible quality loss at the display size.
Common target dimensions
- Website hero images — 1200–1600px wide. Covers most desktop viewports without excessive file size.
- Blog post images — 800–1000px wide. Matches typical content column widths.
- Thumbnails and avatars — 150–300px. Small dimensions keep file sizes under 20 KB.
- Social media — Platform-specific: Instagram recommends 1080px square, Twitter header images are 1500 x 500px, LinkedIn banners are 1584 x 396px.
- Email signatures — 300–600px wide. Larger images get clipped or slow down email rendering in clients like Outlook.
Understanding aspect ratio
Aspect ratio is the proportional relationship between an image's width and height. A 1920 x 1080 image has a 16:9 ratio. When you resize with aspect ratio locked, changing one dimension automatically adjusts the other to maintain these proportions, preventing the image from looking stretched or squished.
Unlocking the aspect ratio lets you crop to a specific shape — for example, turning a landscape photo into a square for Instagram. Just be aware that the image content will be stretched to fill the new dimensions, which may not look natural for photographs.
How browser-based resizing works
This tool uses the HTML5 Canvas API to resize images entirely in your browser. The original image is drawn onto a canvas at the new dimensions, and the browser's built-in interpolation algorithm smooths the result. The resized image is then exported in its original format. No pixels ever leave your device — open DevTools and verify.
FAQ
- Does resizing reduce file size?
- Yes. Smaller dimensions mean fewer pixels, which directly reduces file size. For further reduction, use our compressor tool.
- Can I upscale images?
- Yes, but upscaling adds pixels through interpolation — it won't add detail. Results look best when downscaling.
- What does 'maintain aspect ratio' do?
- When enabled, changing the width automatically adjusts the height (and vice versa) to keep the image proportions. Disable it for custom stretching.
- Does it strip EXIF data?
- Yes. The Canvas API does not preserve EXIF metadata, which removes location data and camera info for privacy.
- How many files at once?
- Up to 20 images, max 20MB each. Three resize concurrently.
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