画像をオンラインでリサイズ
リサイズ 画像 to exact dimensions or by percentage. 無料, in-browser, no upload.
Drop an 画像 or ファイルを選択
What is an 画像 resizer?
An 画像 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 画像 is too big for a web ページ, 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 画像 and typically scales the width and height together so nothing is cut off.
This free online 画像 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 画像 are never uploaded: change 画像 dimensions in seconds, with no signup and no watermark.
使い方 use the 画像 resizer
- Drop an 画像 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 リサイズ, and download the resized 画像.
Frequently asked questions
Can I resize an 画像 by percentage?
Yes — enter a percentage such as 50 to scale the 画像 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 画像 is never stretched. Enter both values if you want an exact size, even at the cost of distortion.
Will resizing make my 画像 blurry?
Enlarging an 画像 always softens it because the tool must invent pixels that were never captured. Shrinking an 画像 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.