調整JPG尺寸
Change the width and height of JPG files while keeping their proportions intact. 直接在瀏覽器中執行——無需上傳、無需註冊、完全私密。
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This page resizes JPG files specifically. The JPG format is decoded, scaled and re-encoded entirely inside your browser, so the file never travels anywhere and the output stays in JPG.
How it works
- Select one or more JPG files.
- Enter the width or height you want, in pixels or as a percentage.
- Keep the aspect ratio locked unless you specifically need to distort the image.
- Download the result as JPG.
Good to know
Resizing a JPG file re-encodes it, which means the compression is applied again. Going down in size usually shrinks the file considerably; going up will make it larger without adding real detail.
Frequently asked questions
Does resizing JPG lose quality?
Scaling down looks clean because you are discarding pixels you no longer need. Scaling up cannot add information, so a JPG enlarged well beyond its original size will look soft.
Can I resize several JPG files at once?
Yes — select as many JPG files as you like and the same dimensions are applied to all of them.