📐 图像缩放工具
Resize images by exact pixel dimensions or percentage. Maintain aspect ratio or set custom dimensions.
图片缩放器：按像素或百分比缩放图片
图片缩放器让你按像素或百分比缩放图片。全部在浏览器本地处理，无需上传、无需注册。
为社交媒体头像缩放照片
为社交媒体头像缩放照片。这是人们使用图片缩放器最常见的理由之一——几秒内即可在浏览器中完成。
缩小图片用作邮件缩略图
缩小图片用作邮件缩略图。这是人们使用图片缩放器最常见的理由之一——几秒内即可在浏览器中完成。
批量将商品图缩放为统一尺寸
批量将商品图缩放为统一尺寸。这是人们使用图片缩放器最常见的理由之一——几秒内即可在浏览器中完成。
图片缩放器所需的一切功能
让图片缩放器快速、私密且免费的强大功能。
精确尺寸
按精确像素或百分比设置，像素级精准。
锁定比例
自动保持比例，避免拉伸变形。
自由与预设
自由裁剪或使用社交媒体现成的比例预设。
100% 隐私
全部本地处理——图片不离开浏览器。
永久免费
无需注册、无水印、无隐藏限制。
跨平台
任意现代浏览器设备可用。
How to Use
Upload
Select the image you want to resize.
Set Dimensions
Enter width and height in pixels, or use the percentage slider.
Resize & Save
Click Resize and download the result.
Detailed User Guide
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.
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