Image Resizer
Resize photos to exact dimensions or popular presets like Instagram square and story sizes. All processing happens on your device with Canvas API.
How to Resize Images Online
- 1
Upload your image
Drop a JPG, PNG, or WebP file into the upload zone or click to select from your device. ImageSize displays the original width and height immediately so you know your starting dimensions before making any changes.
- 2
Enter target dimensions
Type your desired width and height in pixels. Toggle aspect ratio lock to scale proportionally — when locked, changing width automatically updates height to maintain the original proportions and avoid stretched results.
- 3
Use presets (optional)
Quick presets include 1920×1080 (Full HD), 1280×720 (HD), 1080×1080 (Instagram square), and 1080×1920 (Story/Reels). Presets apply instantly and you can fine-tune the numbers afterward for exact requirements.
- 4
Choose output format
Select JPG, PNG, or WebP for the exported file. JPG is ideal for photos, PNG for graphics with transparency, and WebP for modern websites seeking smaller file sizes with good quality.
- 5
Download the resized image
Click download to save the new file. Your original image remains untouched on disk. Check the dimension summary to confirm the export matches your specifications before uploading to social media or your CMS.
Frequently Asked Questions
- Does resizing reduce image quality?
- Shrinking an image generally preserves sharpness because pixels are averaged down. Enlarging beyond the original size can look soft or pixelated because new pixels are interpolated. For best results, start with the highest resolution source you have.
- Can I resize without cropping?
- Yes. With aspect ratio lock enabled, ImageSize scales the entire image to fit within your target dimensions without cutting off edges. Use the crop tool if you need to fill a specific frame exactly.
- What units does ImageSize use?
- Dimensions are in pixels, which is what websites, apps, and most social platforms expect. If you need print sizes in inches, multiply by your desired DPI (e.g., 8 inches × 300 DPI = 2400 pixels).
- Are images uploaded to a server?
- Never. Resizing uses the HTML Canvas API entirely in your browser. Your files are read from local memory only, making ImageSize safe for confidential or unreleased work.
- Which preset should I use for Instagram?
- Feed square posts use 1080×1080. Stories and Reels use 1080×1920. Landscape feed posts often use 1080×566. Always check Instagram's latest guidelines as platforms occasionally update recommended dimensions.
- Can I resize multiple images at once?
- The resizer processes one image at a time for precise control. For batch resizing, run multiple files through the compressor with max-width enabled, or revisit batch support in a future ImageSize update.