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🔍 图像放大

Enlarge images to 2x, 3x, or 4x with smart interpolation and sharpening. Perfect for printing, wallpapers, and high-resolution displays. 100% browser-based.

✨ See what this tool can do
Before
Before
✅用 AI 放大图片最高 4x
🎯放大低分辨率照片用于打印
🔒100% 隐私 —— 浏览器端运行
🔍
After — processed
🖼️ Try with a sample image

图片放大器：用 AI 放大图片最高 4x

图片放大器让你用 AI 放大图片最高 4x。全部在浏览器本地处理，无需上传、无需注册。

⚡

放大低分辨率照片用于打印

放大低分辨率照片用于打印。这是人们使用图片放大器最常见的理由之一——几秒内即可在浏览器中完成。

🎯

为高 DPI 屏放大图标

为高 DPI 屏放大图标。这是人们使用图片放大器最常见的理由之一——几秒内即可在浏览器中完成。

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为演示改善小图

为演示改善小图。这是人们使用图片放大器最常见的理由之一——几秒内即可在浏览器中完成。

图片放大器所需的一切功能

让图片放大器快速、私密且免费的强大功能。

🤖

AI 驱动

神经网络在浏览器内运行——无需云端、不上传。

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一键出效

自动增强，无需复杂设置。

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100% 隐私

照片本地处理，绝不上传。

🎯

自然效果

增强保留自然、不夸张的外观。

🆓

永久免费

无需注册、无积分、无水印。

🌐

跨平台

任意现代浏览器设备可用。

🔒
100% 隐私
文件不离开浏览器
⚡
浏览器端
无需安装、不上传
💯
永久免费
无需注册、无水印
🚀
无需注册
即刻开始，无需账号

How to Use

1

Upload Image

Click the upload area or drag and drop your image file.

2

Choose Scale

Select 2x, 3x, or 4x enlargement. Adjust sharpening if needed.

3

Preview

See the upscaled result with dimensions displayed for comparison.

4

Download

Click "Upscale & Download" to save the high-resolution image.

Detailed User Guide

Step 1: Upload Your Image

Click the upload area or drag and drop an image file. Supported formats include JPG, PNG, and WebP. The image loads instantly and a preview appears. The original dimensions are displayed in the sidebar so you know your starting point.

Step 2: Choose Your Scale Factor

Select how much you want to enlarge the image:

  • 2x: Doubles the dimensions. A 800×600 image becomes 1600×1200. Best for most use cases — good balance of quality and file size.
  • 3x: Triples the dimensions. A 800×600 image becomes 2400×1800. Great for printing at larger sizes.
  • 4x: Quadruples the dimensions. A 800×600 image becomes 3200×2400. Best for wallpaper-sized outputs or large prints, but file sizes will be significantly larger.
Tip: Higher scale factors produce larger files. If you just need a moderate size increase, 2x is usually sufficient.

Step 3: Adjust Sharpening

When images are enlarged, they can look slightly soft or blurry. The sharpening filter adds edge contrast to make details pop. Use the slider to control the strength:

  • 0%: No sharpening — smoothest result, good for watercolor-style images
  • 50%: Balanced — good for most photos (default)
  • 100%: Maximum sharpening — best for text, line art, or screenshots

The preview updates in real-time so you can find the sweet spot. Over-sharpening can introduce halos around edges, so start low and increase gradually.

Step 4: Upscale & Download

Click "Upscale & Download" to process the image at full resolution and save it. Choose PNG for maximum quality (especially for graphics with sharp edges), JPG for smaller file sizes, or WebP for modern efficiency.

Best Use Cases

  • Print preparation — Enlarge digital photos to meet minimum print resolution requirements (300 DPI)
  • Wallpapers — Scale up images to fit high-resolution monitors (4K, 5K displays)
  • Social media — Meet minimum dimension requirements for cover photos and banners
  • Presentations — Ensure images look sharp on large projection screens
  • Logo scaling — Enlarge small logos or icons for larger formats
  • Photo restoration — Upscale old, low-resolution family photos

Pro Tips

  • Start with the highest-quality source image you have — upscaling can't create detail that isn't there
  • For photos, 2x with moderate sharpening usually gives the best results
  • For screenshots or text-heavy images, use higher sharpening (70-100%)
  • PNG format preserves sharp edges — use it for logos, icons, and screenshots
  • Use JPG format for photographs to keep file sizes manageable at higher scales
  • Very large upscales (4x on already large images) may take a few seconds to process

常见问题

Regular resizing uses basic interpolation which produces blurry results. Our upscaler uses high-quality bicubic interpolation combined with a sharpening filter that enhances edges and restores detail clarity. The result is noticeably crisper than a simple resize.
No. All processing happens entirely in your browser using the Canvas API. Your images never leave your device. No server ever receives or stores your files.
Currently we support 2x, 3x, and 4x as these are the most commonly needed factors. If you need a specific size, try using our Image Resizer tool after upscaling to get the exact dimensions you need.
Upscaling cannot create detail that doesn't exist in the original image. What it does is intelligently interpolate between existing pixels and apply sharpening to maintain the perception of sharpness. The result looks better than a simple resize, but won't match a natively high-resolution photo.
The sharpening filter is an unsharp mask technique that enhances edge contrast. It works by subtracting a blurred version of the image from the original, which makes edges appear crisper. The slider controls the intensity of this effect.
There's no artificial limit, but very large outputs (e.g., 4x on a 5000px image = 20000px) may be slow or run into browser memory constraints. Most typical photo upscales complete in seconds.
Use PNG for images with sharp edges (logos, screenshots, text) or when quality is paramount. Use JPG for photographs where file size matters more than pixel-perfect accuracy. WebP is a good modern alternative that balances both.
2x 和 4x 放大。
AI 放大智能填补细节，但无法创造原图不存在的信息。
不在。AI 模型完全在浏览器内通过 WebAssembly 和 WebGL 运行。
AI 增强是起点——可用编辑工具进一步微调。

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