图像缩放器
在浏览器内按目标宽高调整 JPEG、PNG、WebP 图片，支持锁定原始宽高比并保持原格式下载。
使用步骤
如何使用
- Choose a JPEG, PNG, or WebP image up to 20 MB and 40 megapixels.
- Enter a target width or height; keep the aspect ratio locked or set both dimensions yourself.
- Resize the image, review the result, and download the new file.
Exact size with an optional ratio lock
When the lock is on, changing width recalculates height and changing height recalculates width from the source image ratio. Turn it off to enter both dimensions independently.
Local conversion and format limits
Canvas creates the result in your browser and keeps the source JPEG, PNG, or WebP format. The resized copy does not retain source metadata. Output is limited to 10,000 pixels per side and 40 megapixels.
常见问题
你可能还想知道
Can I resize by width only?
Yes. Keep the aspect ratio locked, then change width; height is calculated automatically.
Can this make an image larger?
Yes, but enlarging cannot restore detail that is missing from the source and may look soft.
Does it preserve transparency?
PNG and WebP output can preserve transparency. JPEG has no transparency, and the source format is retained.