调整大小 Image 在线
调整大小 图片 to exact dimensions or by percentage. 免费, in-browser, no upload.
Drop an 图片 or 浏览文件
What is an 图片 resizer?
An 图片 resizer changes the pixel dimensions of a picture — making it larger or smaller, to exact width and height values, or by a percentage of its original size. Resizing is essential when an 图片 is too big for a web 页, needs to fit a specific social media dimension like 1080×1080, or should be scaled down before uploading to a service with file limits. Unlike cropping, resizing keeps the whole 图片 and typically scales the width and height together so nothing is cut off.
This free online 图片 resizer lets you enter a new width, a new height, a scaling percentage, or any combination of the three — leave fields empty and the tool keeps the aspect ratio for you automatically. Output is available as JPG, PNG, or WebP. Everything runs locally in your browser with the canvas API, so your 图片 are never uploaded: change 图片 dimensions in seconds, with no signup and no watermark.
使用方法 use the 图片 resizer
- Drop an 图片 onto the box above, or click browse to pick a file.
- Enter the target width and height in pixels, or a percentage — fill in only one box to keep the aspect ratio automatically.
- Pick JPG, PNG, or WebP as the output format, click 调整大小, and download the resized 图片.
Frequently asked questions
Can I resize an 图片 by percentage?
Yes — enter a percentage such as 50 to scale the 图片 down to half its size, or 200 to double it. The width and height are both scaled by the same factor.
Does resizing keep the aspect ratio?
Yes. If you enter only a width or only a height, the other dimension is calculated automatically so the 图片 is never stretched. Enter both values if you want an exact size, even at the cost of distortion.
Will resizing make my 图片 blurry?
Enlarging an 图片 always softens it because the tool must invent pixels that were never captured. Shrinking an 图片 keeps it sharp and usually improves perceived quality by removing noise.
What formats can I export?
JPG, PNG, and WebP. Choose JPG for the smallest files, PNG when you need transparency, and WebP for the best modern web compression.