📐 Đổi Kích Thước Ảnh

Step 1: Upload Your Image

Upload a JPG, PNG, or WebP image. The tool automatically reads the original dimensions and populates the width and height fields.

The resizer interface — original dimensions are auto-filled after upload

Step 2: Set New Dimensions

You have two ways to resize:

• Exact pixels: Enter width and height in pixels. Check "Keep aspect ratio" to automatically maintain proportions when changing one dimension.
• Percentage: Use the slider to scale by percentage (10%–200%). This is the quickest way to make an image half-size or double-size.

Step 3: Resize & Download

Click "Resize" to process. The preview updates to show the new dimensions. Click "Download" to save the resized image with -resized appended to the filename.

Common Social Media Sizes

• Instagram Post — 1080 × 1080 px (square) or 1080 × 1350 px (portrait)
• Instagram Story / Reel — 1080 × 1920 px (9:16)
• Twitter / X Header — 1500 × 500 px
• Facebook Cover — 820 × 312 px
• LinkedIn Banner — 1584 × 396 px
• YouTube Thumbnail — 1280 × 720 px

Pro Tips

• Enlarging an image beyond its original size reduces sharpness — use AI upscalers for better results
• Reducing size generally maintains excellent quality thanks to high-quality canvas scaling
• Use the percentage slider for quick batch-like scaling (50% = half dimensions, 25% = quarter area)
• For print, aim for 300 DPI. A 1200 × 1800 px image at 300 DPI prints at 4 × 6 inches