이미지 크기 조정 — 무료 온라인 도구

Why resize an image

Platforms and layouts expect specific dimensions, and an oversized image wastes bandwidth while an undersized one looks blurry when stretched. Resizing sets the exact width and height you need, whether that is a 1080-pixel social post, a 150-pixel avatar, or a banner that fits a template. It also shrinks file size, which speeds up uploads and page loads.

Aspect ratio and distortion

Locking the aspect ratio keeps the original proportions, so changing the width updates the height automatically and the picture never looks squashed. Unlocking it lets you force exact dimensions when a layout demands them, at the risk of stretching. For most jobs you keep the ratio locked and crop separately if you need a different shape.

Scaling up versus down

Scaling down is safe because you are discarding pixels, so the smaller image stays sharp. Scaling up invents pixels that were never captured, so an enlarged image looks softer the more you stretch it. For best quality, start from the largest original you have and resize downward to the size you need rather than upscaling.

Private, browser-based

Resize Image runs in your browser. The photo is drawn to a canvas at the new dimensions and returned as a download. Nothing is uploaded or stored, so your images never leave your device. Resizing a typical photo completes in well under a second.

사용 방법 이미지 크기 조정

1. Open the Resize Image tool and add your photo.
2. Enter the target width or height in pixels.
3. Keep the aspect ratio locked to avoid stretching.
4. Apply the resize in your browser.
5. Download the resized image.

Fit a social post

관련 도구

• 이미지 자르기
• 이미지 압축
• 이미지 회전
• 흑백 변환