画像リサイズツール

About 画像リサイズツール

Last updated: May 2026

OptiPix Image Resizer lets you resize images to exact pixel dimensions with presets for all major social media platforms. Choose from built-in presets for Instagram posts (1080x1080), Instagram stories (1080x1920), Twitter headers (1500x500), LinkedIn banners (1584x396), Facebook covers (820x312), YouTube thumbnails (1280x720), and more. Or enter custom dimensions for any specific requirement. The resizer uses high-quality bicubic interpolation for smooth results and maintains aspect ratio by default (with an option to disable it for exact sizing). All processing happens in your browser - no uploads, no server processing, complete privacy. The tool supports JPEG, PNG, and WebP inputs, and you can choose your output format. Batch resizing is supported for processing multiple images with the same settings. Perfect for social media managers, content creators, web developers, and anyone who needs images at specific dimensions.

How It Works

The resizer creates a Canvas element at your target dimensions and draws the original image scaled to fit, using the browser's bicubic interpolation for smooth results. The resized image is then encoded in your chosen output format.

Use Cases

• •Resize photos to Instagram's 1080x1080 post format
• •Create Twitter header images at 1500x500
• •Prepare LinkedIn banner images at 1584x396
• •Resize product photos to consistent dimensions for e-commerce
• •Create YouTube thumbnails at 1280x720

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If you find 画像リサイズツール useful, check out these related tools: Image Crop, Video Resizer, and Format Converter. All tools run entirely in your browser with no uploads or signups required.