About This Tool
What is 图片尺寸调整工具?
A tool for resizing images to custom dimensions. Maintain aspect ratio or freely set width and height. Useful for social media uploads, website optimization, and image standardization.
How to Use
- Click 'Select Image' to upload an image.
- Enter the desired width and height.
- Check 'Maintain aspect ratio' to preserve proportions.
- Set format and quality, then download.
Key Features
- Free resizing to any dimensions
- Aspect ratio preservation option
- Output format selection (PNG, JPG, WebP)
- Quality adjustment
Tips
- Recommended social media sizes: Instagram 1080x1080, Facebook cover 820x312, Twitter 1200x675.
- Maintaining aspect ratio prevents image distortion.
- For web images, 1920px width is sufficient for most screens.
Frequently Asked Questions
社交媒体平台推荐的图像尺寸是什么？▼
Instagram帖子：1080x1080（方形）或1080x1350（竖版）。Facebook封面：820x312，帖子：1200x630。Twitter/X头图：1500x500，帖子：1200x675。LinkedIn横幅：1584x396。YouTube缩略图：1280x720。平台指南可能会变，请随时查看最新要求。
调整图像大小会降低质量吗？▼
放大总会降低质量，因为必须插值（猜测）新像素。缩小会丢弃像素但通常看起来没问题。最佳做法是从高分辨率原图开始，只进行缩小。质量设置影响JPG/WebP压缩，不影响调整大小算法。
'保持纵横比'是什么意思？▼
纵横比是宽度和高度的比例关系（如16:9、4:3）。启用后，更改宽度会自动调整高度以保持相同比例，防止图像被拉伸或压扁。