Online Image Cropper

Original Size:
Crop Size:
Aspect Ratio:

How it Works

The online image cropper uses HTML5 Canvas API to process images locally in your browser, without uploading to any server, ensuring your privacy.

Cropping Process:

  1. 1. Read Image: Use FileReader API to read and display your selected image on the canvas.
  2. 2. Draw Crop Box: Create a draggable, resizable crop box with 8 control points for precise adjustment.
  3. 3. Real-time Preview: Display cropped result in real-time based on crop box position and size.
  4. 4. Export: Extract cropped area to new Canvas, convert to PNG format, and trigger download.

Use Cases

Social Media Avatars

Crop images to 1:1 square format, perfect for profile pictures on Facebook, Twitter, Instagram, and more.

Remove Extra Background

Precisely crop the main subject of your photo, removing unwanted edges and background clutter.

Adjust Photography Composition

Reframe your photos through cropping, following composition rules like rule of thirds for better aesthetics.

Frequently Asked Questions

Will cropping reduce image quality?
No. Cropping simply extracts a portion of the original pixels without compression or scaling, so the quality within the cropped area remains identical to the original. However, the default PNG export may result in different file sizes compared to JPEG originals.
Can I freely adjust the crop box?
Yes. The crop box has 8 control points (4 corners + 4 edge midpoints) for dragging and resizing. If you select an aspect ratio (like 1:1, 16:9), the box maintains that proportion. Choose "Free" for unrestricted adjustment.
What aspect ratios are supported?
Presets include: 1:1 (square, perfect for avatars), 16:9 (widescreen video), 4:3 (traditional photo), 3:2 (DSLR camera), and 9:16 (vertical video). Plus "Free" mode for no ratio constraints.
Is my image uploaded to a server?
No. All processing happens locally in your browser. Your image never leaves your device, ensuring complete privacy and security, ideal for sensitive or private photos.
What format is the cropped image?
Exports as PNG format (lossless compression) by default. PNG supports transparent backgrounds and provides the best quality, though files may be larger. JPEG export option may be added in the future for smaller file sizes.
Can I crop multiple images at once?
The current version processes one image at a time. After cropping, click "Choose New Image" to process the next one. For batch cropping, consider using dedicated batch image processing software.
Can I reset if the crop box is wrong?
Yes. Click the "Reset Crop" button to restore the crop box to its initial state (default size, centered). You can also quickly adjust by switching between aspect ratio presets.
Why does the filename include size information?
To help you quickly identify the dimensions of your cropped image, the download filename automatically includes width and height info (e.g., cropped_800x600.png). This is useful when you need specific image sizes.

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