📐 Exact Pixels · Aspect Ratio · Free

Image
Resizer

Resize any image to exact pixel dimensions. Maintain aspect ratio or set custom width and height. No upload, instant download.

📐

Click or drag an image here

PNG, JPG, WebP, GIF — any format

Quick presets:
1920×1080 1280×720 800×600 400×400 200×200 100×100 50% 25%
🔒
Original
Original
Resized preview

Free Online Image Resizer — Change Image Dimensions Instantly

ExperToolBox's image resizer lets you change the width and height of any image to exact pixel dimensions, with an optional aspect ratio lock to prevent distortion. Quick-select preset sizes for common formats (HD, 4K, social media, thumbnails), or enter custom dimensions manually.

All resizing happens locally in your browser using the HTML5 Canvas API. Your images are never uploaded to any server. The output downloads as a high-quality PNG file.

Common image size requirements

Different platforms require different image dimensions. Social media profile pictures are typically 400×400px. Twitter/X header images are 1500×500px. YouTube thumbnails are 1280×720px. Facebook cover photos are 851×315px. Website hero images typically range from 1200×400px to 1920×800px. Blog post featured images are usually 1200×630px for optimal sharing.

Frequently Asked Questions

What does "lock aspect ratio" do?
When aspect ratio lock is enabled (🔒), changing the width automatically recalculates the height to maintain the original proportions, and vice versa. This prevents the image from appearing stretched or squashed.
Does resizing reduce file size?
Yes, reducing dimensions reduces file size because there are fewer pixels to store. For further reduction beyond resizing, use the Image Compressor tool to adjust the compression quality as well.
Can I enlarge an image?
Yes, but enlarging a raster image beyond its original size will reduce quality — the image will appear blurry or pixelated because the tool creates new pixels by interpolating existing ones. For best results, only resize images to smaller dimensions.

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