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PowerUtils
2026-06-15•1 分鐘閱讀

如何線上調整圖片尺寸

學習如何使用 PowerUtils 免費線上圖片調整工具在保持品質的同時將圖片調整到精確尺寸。適合網頁優化和社交媒體。

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Why Resize Images?



Image resizing is necessary for:
  • Website performance optimization

  • Social media requirements

  • Email attachments

  • Print specifications


    • How to Use the Image Resizer



    Step 1: Upload Image



    Visit the Image Resizer and upload your image.

    Step 2: Set Dimensions



    Choose resizing method:
  • Exact Size: Width and height in pixels

  • Percentage: Scale by percentage

  • Max Dimension: Fit within bounds

  • Preset Sizes: Common web and social sizes


    • Step 3: Download



    Get your resized image with maintained quality.

    Image Resizing Tips



  • Aspect Ratio: Lock ratio to prevent distortion

  • Upsizing: Avoid enlarging small images (quality loss)

  • Web Sizes: 1200px wide is usually sufficient

  • Retina Displays: Double size for high-DPI screens


    • Related Tools



  • Image Compressor - Reduce file size

  • Image Cropper - Trim images

  • Image Converter - Change formats


    • Related Articles



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