이미지 자르기 — 무료 온라인 도구

Why crop an image

Cropping removes the parts of a picture you do not need so the subject fills the frame. It is the fastest way to straighten a crooked horizon, cut out a distracting background, fit a photo into a fixed banner space, or create a square thumbnail from a wide shot. Crop Image gives you a draggable selection box over the picture and exports only the chosen region at full pixel resolution, so the result stays crisp. Nothing is uploaded, so even sensitive screenshots and documents can be trimmed safely.

How browser cropping works

When you load a photo the tool draws it to an HTML canvas. The selection rectangle you move and resize maps one to one onto the original pixels, and when you confirm the crop the tool copies just that rectangle into a new canvas and encodes it as a downloadable image. Because the math is done on the real pixel grid rather than a scaled preview, a crop is exact to the pixel. There is no re-sampling of the area you keep, so quality inside the selection is identical to the source.

Choosing the right aspect ratio

Different platforms expect different shapes. A 1 to 1 square suits profile pictures and product tiles, 16 to 9 fits video thumbnails and presentation slides, 4 to 5 is the tall format that performs well in mobile feeds, and 1.91 to 1 matches link preview cards. Cropping to the target ratio before you upload stops the platform from cutting your image in an unflattering place and keeps the important subject centered.

Privacy and safety

Crop Image processes your picture locally. The file is read into the browser, displayed, and trimmed in memory, then handed back to you as a download. No copy is sent to a server, kept in a database, or shared. This local approach means you can crop a passport scan, a bank statement, or an unreleased design with confidence. When you close the page, every trace of the image is gone from memory.

Browser and device support

The tool runs in Chrome, Firefox, Safari, and Edge across desktop and mobile, with no install required. On a phone the selection handles are large enough to drag with a finger, and the layout stays usable down to a 375 pixel wide screen. Common formats including JPG, PNG, WebP, GIF, and BMP load directly, and files up to about 50 MB crop smoothly.

Cropping versus resizing

Cropping and resizing solve different problems and are often used together. Cropping changes which part of the picture is shown by cutting away pixels at the edges, while resizing changes the overall dimensions by scaling every pixel up or down. If a photo is the right size but shows too much background, crop it. If it is framed correctly but too large in megapixels, resize it. A common workflow is to crop first to the composition you want, then resize the result to the exact width a website or print job requires, so you never scale away detail you might have kept.

Tips for a clean crop

Leave a little breathing room around the subject rather than cutting too tightly, because platforms sometimes trim a few more pixels when they display an image. Use the rule of thirds by placing the main subject off-center for a more natural composition. When cropping faces, keep the eyes in the upper third of the frame. Match the aspect ratio to the destination before you export so the platform does not re-crop your work, and zoom in to check the edges so no important detail is clipped at the boundary of the selection. If you are preparing the same photo for several places, crop a separate copy for each shape rather than reusing one crop, since a square avatar and a wide banner need very different framing to look their best.

사용 방법 이미지 자르기

1. Open the Crop Image tool and add your picture.
2. Drag the selection box to cover the area you want to keep.
3. Resize the handles to fine-tune the edges to the pixel.
4. Confirm the crop to render the selected region.
5. Download the cropped image in its original format.

Make a square profile picture

관련 도구

• 이미지 크기 조정
• 이미지 압축
• 이미지 회전
• 흑백 변환