圖片調整大小工具
FREE將圖片調整為精確的像素尺寸或百分比。保持品質和長寬比。免費使用。
什麼是免費Image Resizer Tool？
The Free Image Resizer by Nano Banana is a powerful online tool to resize images and change photo dimensions instantly. Whether you need to scale images for web use, reduce file size for email, or enlarge photos for printing, our tool handles it all. Resize by exact pixels (e.g., 800x600), scale by percentage (e.g., 50%), or maintain aspect ratio for proportional sizing. Perfect for web developers, designers, photographers, and anyone needing quick image resizing. No software installation required—works entirely in your browser with complete privacy.
為什麼選擇我們的Image Resizer？
Exact Pixel Control
Enter precise width and height. Perfect for web requirements and design specs.
Percentage Scaling
Scale images by percentage—50% to halve, 200% to double. Intuitive and fast.
長寬比鎖定
Maintain proportions automatically. Prevent distortion with one-click lock.
Quality Preservation
Smart resampling algorithms maintain sharpness during resize.
Multiple Format Output
Resize and convert in one step. Output as JPG, PNG, or WebP.
完全隱私
All processing in your browser. Your images stay on your device.
如何Resize Images Online
上傳您的圖片
Click to upload or drag and drop your photo. Supports PNG, JPG, JPEG, and WebP formats up to 10MB.
Choose Resize Method
Enter exact dimensions (width x height in pixels), scale by percentage, or use preset sizes for common web/print formats. Toggle "maintain aspect ratio" to prevent distortion.
Resize & Download
Click "Resize" to process. Preview your resized image, then download in your preferred format. Instant results in your browser.
Key Features of Our Image Resizer
Exact Pixel Dimensions
Enter precise width and height in pixels. Perfect for web images that must fit specific layouts or requirements.
Percentage Scaling
Scale images by percentage (e.g., 50% to halve size, 200% to double). Simple and intuitive resizing method.
Maintain Aspect Ratio
Lock aspect ratio to prevent distortion. Change one dimension and the other adjusts automatically for proportional sizing.
Quality Preservation
Smart resampling algorithms maintain maximum quality when resizing. Adjustable quality settings for output.
即時預覽
See your resized image before downloading. Compare original and resized versions side by side.
100% Private
All resizing happens locally in your browser. Your images never uploaded to our servers. Complete privacy.
When to Resize Images
Website Optimization
Reduce image dimensions for faster page loading. Typical web images: 1920px wide for full-width, 800-1200px for content images.
Email Attachments
Shrink images to fit email size limits. Resize to 50-75% of original to reduce file size while maintaining quality.
Social Media Upload
Resize for optimal social media display. Instagram: 1080x1080 (square), 1080x1350 (portrait). Facebook: 1200x630 for link previews.
列印準備
Enlarge or resize images for specific print sizes. Maintain 300 DPI for quality prints: 4x6" needs 1200x1800px.
Profile Pictures
Resize profile photos to platform requirements. LinkedIn: 400x400px, Twitter: 400x400px, Discord: 128x128px minimum.
Thumbnail Creation
Create smaller versions for thumbnails and previews. Typical thumbnails: 150x150px to 300x300px for grid displays.
Resizing Images進階技巧
從高解析度開始
Begin with the largest version. Scaling down preserves quality better than scaling up.
Know Your Target Dimensions
Web: 1200-1920px wide. Email: 600-800px. Social: platform-specific.
Always Maintain Aspect Ratio
Unless you specifically need stretching, keep aspect ratio locked to avoid distortion.
Consider Retina Displays
For web, use 2x your display size (800px display = 1600px image) for sharp retina rendering.
Check File Size After Resizing
Smaller dimensions = smaller file size. Balance quality with loading speed.
Image Resizer vs 替代方案
Compare our free resizer with other options.
| 功能 | Nano Banana | 其他 |
|---|---|---|
| 價格 | 永久免費 | Photoshop: $20.99/mo, paid tools vary |
| Resize Methods | Pixels, percentage, presets | Often limited options |
| 隱私 | 100% browser-based | Cloud upload common |
| Quality Algorithms | Multiple resampling options | Basic resize only |
| Format Conversion | Included | Often separate tool |
| 批次處理 | 是 | Premium feature elsewhere |
用戶評價
Kevin M.
Web Developer
“Perfect for preparing images for websites. The batch feature saves hours.”
Sandra P.
Etsy Seller
“All my product photos are now consistent sizes. Makes my shop look professional.”
Chris L.
Email Marketer
“Quick way to get images under email size limits without losing quality.”
常見問題
Resizing down (making smaller) preserves quality well. Enlarging (making bigger) may reduce sharpness. Our algorithm minimizes quality loss.