Top 5 Best AI Image Expansion Tools in 2024

You’ve got a fantastic image you’re excited to share on social media, but when you upload it, you’re met with frustration. The image is either cropped awkwardly or left with unattractive black borders because of the varying image size requirements on different platforms. 

But don’t worry! You can turn to AI image expansion tools to fix this. These cutting-edge tools use artificial intelligence to intelligently extend the edges of your image, filling in new pixels that match the content and style of the original. This way, your expanded image looks seamless and natural. 

I’ve personally tried out 5 of these AI image expansion tools, each with its own unique features. Here they are for you to consider:

  1. Uncrop by Stability AI – Suitable for people seeking a free option.
  2. Promeai Outpainting – The user targeting is biased towards architects, product designers, etc.
  3. Fotor AI Image Expander – Suitable for people seeking low prices.
  4. Photoshop Generative Fill – Suitable for professional users.
  5. Canva Magic Expand – Best value for money.

#5. Uncrop by Stability AI

Uncrop is an aspect ratio editing tool developed based on the Stability AI model. It can analyze the existing content of an image and intelligently generate the missing parts, achieving natural and coherent image expansion. Stability AI is an AI research company based in London, UK, dedicated to developing and promoting the most advanced artificial intelligence technologies. The company was founded in 2020 by a group of AI experts from top institutions such as the University of Cambridge and Imperial College London.

How to use Uncrop to expand an image:

Step 1: Go to the usage interface of Uncrop, https://clipdrop.co/uncrop. Then click the blue button to upload the image you want to expand.

Step 2: Choose the aspect ratio and size for the image you want to expand. You can customize or select the preset Landscape, Portrait, Square. Then click Next, and a pop-up will prompt you to register to proceed to the next step. Free registered users can process 20 images per day, which is enough for personal users. If you need to process a large number of images, you can upgrade to a Pro user, with a subscription fee of $13 per month.

Step 3: Uncrop starts to expand the image according to your requirements. After several seconds to a few minutes, 4 images will be generated for you to choose from. If you are not satisfied with these 4, you can click the + button to generate 4 more until you find one that meets your expectations. Then click the Download button in the top right corner to download it to your local device.

My User Experience:

Pros: Uncrop has the clearest and most user-friendly interface and operation logic among all the image expansion tools I have used, and it can generate expanded images that meet my needs, and it can be used for free with a registered account.

Cons: Free users need to queue to extend images. Depending on the number of online users at that time, the waiting time can vary from several seconds to a few minutes.

#4. Promeai Outpainting

PromeAI is an AI design platform. Architects, product designers, social media enthusiasts, or marketers can input their ideas and creativity into PromeAI, and the artificial intelligence will seamlessly transform these inputs into visual effects, eliminating the tedious work in the design process. Promeai Outpainting is one of the AI image expansion tools that can extend the canvas of an image beyond its original boundaries. Promeai Outpainting can understand the context and style of the original image, and when you expand it, the AI predicts and generates content that matches the existing image, ensuring naturalness and coherence.

How to Use Promeai Outpainting Tool:

Step 1: Open Promeai Outpainting

Go to the Promeai official website, https://www.promeai.com/, hover over the AI Tools dropdown menu at the top navigation, and click Outpainting.

Step 2: Upload the Image You Want to Expand

In the Promeai Outpainting tool interface, click the “+” button, then select the image you want to expand. Promeai supports multiple image formats, so you don’t need to worry about compatibility issues.

Step 3: Select the Expansion Direction

After uploading the image, you will see 7 preset image expansion aspect ratios and sizes. Click to select one that meets your needs.

Promeai also provides a text command box where you can enter keywords to help Promeai generate the expanded image you expect. For example, if you want to expand a landscape photo upwards, you can mention “mountains” or “clear sky” to provide hints for AI generation.

Step 4: Generate the Expanded Image

Click the Generate button. Promeai AI will analyze your image and generate 3 image variants based on your selected expansion direction and additional information provided. Take some time to compare them and pick the one that best meets your needs.

Step 5: Download or Save the Expanded Image

After selecting your preferred version, you can download the image to your local device or save it in Promeai assets. Note that Promeai free users can only download low-resolution versions. You need to upgrade to a paid subscription to download high-resolution or clearer Upscale versions. The subscription fee is $29 per month.

My User Experience:

Pros: The operation logic is clear and smooth, and it can generate expanded images that meet my requirements.

Cons: Compared with other AI image expansion tools, Promeai Outpainting’s generation speed is slightly slower.

#3. Fotor AI Image Expander

Fotor is a one-stop image editing and design platform that offers many AI-driven image editing tools, and the Image Extender is one of them. Fotor’s Image Extender allows you to perform AI Inpainting inside the image and AI Outpainting outside the image. AI Inpainting: Use the Fotor AI Magic tool to erase the part of the image you wish to recreate, then tell the AI Image Extender the new elements you want to generate. After a few seconds, the new elements will be generated in the part you previously erased. AI Outpainting: Automatically expand the background of the image outward. You can also enter a description of the background you want in text, and the AI will generate a new background according to your requirements.

4 Steps to Expand an Image with Fotor:

Step 1: Click to register for a free Fotor account, https://www.fotor.com/. Fotor free users can expand up to 8 images per day, and paid users can remove this restriction, with the lowest membership price at 2.83 euros/month (about $3.08).

Step 2: After logging in, click “AI Tools” in the left menu bar and then select “AI Extender (Beta)” to enter the tool interface. After that, click “Open Image” to upload the image you want to expand.

Step 3: Slide “Zoom Out” to determine the final size of the image you want to expand. You can also click “Custom size” to customize the final image size, then click “Generate” to start expanding the image.

Step 4: After a few seconds, 3 different expanded images will be generated for you to choose from. If you are not satisfied, you can generate more. After determining the final image you want, click the “Apply” button. Afterward, click “Download” to download it to your local device.

My User Experience:

Pros: I used Fotor to extend the canvas of five images, and it swiftly completed the task in just a few seconds, and I was satisfied with the outcomes.

Cons: Fotor says its expander can use AI to generate customized elements inside the image and customized backgrounds outside the image. I looked for a long time and couldn’t find the operation entrance, which wasted a lot of my time.

#2. Photoshop Generative Fill

The latest 2024 version of Photoshop introduced the Generative Fill feature, which allows you to expand the canvas size of an image and then use AI technology to generate an expanded part that seamlessly blends with the original content. Compared to Photoshop’s traditional Content Aware Fill image expansion feature, Generative Fill produces more realistic and natural results. Generative Fill also allows you to remove or add objects or elements in the image, and then automatically blend the surrounding pixels to fill the gap.

How to use Generative Fill to expand an image:

Step 1: Preparation

Download and install the Creative Cloud desktop application to get the latest version of Photoshop 2024.

Step 2: Expand the canvas

Import the image you want to expand, select the crop tool, and then drag the crop frame left and right to expand the canvas outward. Release the mouse button, and Photoshop will fill the extra canvas with the default background color.

Step 3: Select the expansion area

Switch to the rectangular marquee tool, draw a selection outline around the imported image, being careful not to draw too close to the edge of the image, but slightly inward to achieve seamless integration. Then, select Inverse to select the expansion area.

Step 4: Enable Generative Fill

Near the image, there is a taskbar, find and click the Generative Fill button. In the Generative Fill text command box, leave it blank to let Photoshop fill the area with content that matches the original photo. Click “Generate,” and a progress bar will appear.

Step 6: Witness the magic

After a few seconds, the newly expanded canvas will be filled with new, original AI-generated content. The newly generated part integrates seamlessly with the original image and maintains lighting, shadows, perspective, and even depth of field.

Step 7: 3 variants

In the properties panel, you’ll find 3 expanded image variants. Use the left and right arrows to switch between them and choose the one you are most satisfied with.

Step 8: Fine-tune with the Remove Tool (optional)

If there are some elements in the expanded image that you think are superfluous, you can use Photoshop’s Remove Tool to erase these elements, and the AI will automatically fill in the erased part with content consistent with the surroundings.

My User Experience:

Pros: Generative Fill can quickly generate the expanded part of the image, with each pixel matching the original image’s lighting, perspective, color, and shadows, making it very realistic and hard to detect that it has been edited.

Cons: The generated results are usually satisfactory, but sometimes they can perform poorly, especially when the image contains complex or special image elements.

#1. Canva Magic Expand

Canva’s Magic Expand image expansion tool leverages AI technology to generate content beyond the frame of the image, producing images of different sizes and aspect ratios for social media, advertising materials, posters and infographics, website design, and more, avoiding the issue of images being forcibly enlarged or cropped, which can affect the user experience. Canva Magic Expand has preset common image aspect ratios for you to choose from for expansion and also allows you to freely customize the aspect ratio you want. The expanded image will automatically match the color and style of the original image, maintaining overall consistency.

How to use Canva AI Image Expander:

Step 1: Go to the Canva official website, https://www.canva.com/, and register for a free account.

Step 2: Click on the “Photo Editor” option under the “Design Spotlight” menu at the top navigation, then click the Upload your image button to upload an image you want to expand.

Step 3: Select the image you uploaded, then click the “Magic Expand” icon on the left. Since Magic Expand is a paid feature, you will be prompted to subscribe to Canva at this point, with a monthly fee of $14.99. You can click Free trial to try it for 30 days before deciding whether to subscribe.

Step 4: Next, choose the size you want to expand the image to. You can freely define or directly select the given aspect ratios, such as 1:1, 16:9, 5:4, 4:5, 4:3, 3:4, 3:2, 2:3, etc. After selecting, click the Magic Expand button to start the image expansion.

Step 5: After about 10 seconds, you will see the expanded image, with 4 generated images for you to choose from. If you are not satisfied with these 4, you can click the “Generate new results” button for another expansion.

Step 6: When you get the expanded image you are satisfied with, click the “Resize & Magic Switch” button to confirm or readjust the size of the expanded image.

Step 7: After completing “Resize & Magic Switch”, you can directly click the “Download” or “Share” button in the top right corner to download the image. Canva provides formats such as PNG, JPG for you to choose from.

My User Experience:

Pros: The Canva Magic Expand can quickly generate expanded images that meet my needs, and the image quality is also very good.

Cons: The operation logic is a bit confusing, especially the “Resize & Magic Switch” part, which made me want to give up using it several times.

2024 年 5 款最佳 AI 扩图工具

你有一张很棒的图片想要分享到社交媒体平台,但上传时发现根据不同社媒平台的规格要求,图片被不当裁剪或留下了不美观的黑边。这让你很不爽。其实,你可以尝试利用 AI 图片扩展工具将图片扩展到合适的宽高比。这些创新工具利用 AI 向外扩展图片画布的边缘,并分析图片的内容,根据内容生成新的像素。这可以确保扩展后的图片与原图的风格和内容保持一致。

下面是我用过的 5 个不错的 AI 图片扩展工具,每个工具都有自己的特点,你可选择使用。

  1. Uncrop by Stability AI – 适合追求免费的用户
  2. Promeai Outpainting – 用户定位偏建筑设计师、产品设计师等;
  3. Fotor AI 图片扩展器 – 适合追求低价用户;
  4. Photoshop Generative Fill – 适合专业用户;
  5. Canva Magic Expand – 最具性价比

#5. Uncrop by Stability AI

Uncrop 是基于 Stability AI 模型开发的图片宽高比编辑工具。能够分析图片现有内容,并智能生成缺失部分,实现自然而连贯的图片扩展。Stability AI 是一家位于英国伦敦的 AI 研究公司,致力于开发和推广最先进的人工智能技术。公司成立于 2020 年,由一群来自剑桥大学、伦敦帝国理工学院等顶尖学府的 AI 专家组成。

如何使用 Uncrop 扩展图像?

第 1 步:去到 Uncrop 使用界面,https://clipdrop.co/uncrop。然后点击蓝色按钮上传你要扩展的图片。


第 2 步:选择要扩展图片的宽高比和尺寸。你可以自定义或者选择预设的 Landscape, Portrait, Square。然后点击 Next,这时会弹窗提示你注册才能进行下一步。免费注册用户每天可处理 20 张图片,对个人用户来讲够了,如果你需要大量处理图片,你可升级为 Pro 用户,订阅费为 13 US$ 每月。

第 3 步:Uncrop 开始按你的要求扩展图片,十几秒到几分钟后会生成 4 张图片供你选择。如果你对这 4 张都不满意,你可以点击 + 按钮再生成 4 张,直到符合你预期的一张,然后右上角点击 Download 按钮就可以将其下载到本地了。

使用感受

优点:Uncrop 是我用过的所有扩图工具中用户界面和操作逻辑最清晰最友好的一个,且能够生成符合我需求的扩展图片,且注册账户就能免费使用。

缺点:免费用户需要排队生成扩展图片,根据当时在线使用者的多少,排队时间从十几秒到几分钟不等。

#4. Promeai Outpainting

PromeAI 是一个 AI 设计平台。建筑师、产品设计师、社交媒体爱好者或者营销人员可以将他们的想法创意输入 PromeAI,然后人工智能会将这些输入无缝地转化为视觉效果,消除了设计过程中的繁琐工作。Promeai Outpainting 是其中一个 AI 扩图工具,可以将图片的画布扩展到原始边界之外。Promeai Outpainting 能够理解原始图片的上下文和风格,当你进行扩展时,AI 预测并生成与现有图片匹配的内容,确保自然和连贯。

如何使用 Promeai Outpainting 扩图工具

第 1 步:打开 Promeai Outpainting 扩图工具

去到 Promeai 官网 https://www.promeai.com/,鼠标移到顶部导航 AI Tools 下拉菜单,点击 Outpainting。

第 2 步:上传你要扩展的图片

在 Promeai Outpainting 工具界面,点击“+”按钮,然后选择要扩展的图像。Promeai 支持多种图像格式,无需担心兼容性问题。

第 3 步: 选择扩展方向

上传图像后,你会看到 7 个预设的图片扩展宽高比和尺寸,点击选择符合你需求的一个。

Promeai 还提供了一个文本命令框,你可以在其中输入关键词来帮助 Promeai 生成你期望的扩展图片。例如,如果你要向上扩展风景照片,你可提及“山脉”或“晴朗天空”来为 AI 生成提供提示。

第 4 步:生成扩展图像

点击 Generate 按钮。Promeai AI 将分析你的图像并根据你选择的扩展方向和提供的附加信息生成 3 个图像变体供你选择。花点时间比较它们,选出最符合你需求的那个。

第 5 步:下载或保存扩展出的图像

选择你最中意的版本后,你可将图像下载到本地或者保存在 Promeai assets 中。注意,Promeai 免费用户只可下载低分辨率的版本,你需要升级为付费订阅用户才可下载高分辨率或者更清晰的 Upscale 版本。订阅费为 $29 每月。

使用感受

优点:操作逻辑清晰流畅,且能够生成符合我要求的扩展图片。

缺点:相较与其他 AI 扩图工具,Promeai Outpainting 的生成速度稍慢。

#3. Fotor AI 图片扩展器

Fotor 是一个一站式图片编辑和设计平台,提供有诸多 AI 驱动的图片编辑工具,图片扩展器(Image Extender)就是其中一个。Fotor 的图片扩展器允许你进行图片内部的 AI 修复绘制(AI Inpainting)和图片外部的扩展绘制(AI Outpainting)。内部修复绘制(AI Inpainting):使用Fotor AI Magic 工具在抹掉图片上你希望重新创作的部分,然后告诉 AI Image Extender 你想要生成的新元素。等待几秒钟后,新的元素就会生成在你之前抹掉的部分。外部扩展绘制(AI Outpainting):自动向外扩展图片的背景。你也可以文本输入你想要的背景的描述,让 AI 根据你的要求生成新背景。

4 步使用 Fotor 扩展一张图片:

第 1 步:点击注册一个 Fotor 免费账号,https://www.fotor.com/。 Fotor 免费用户每天可扩展 8 张图片,付费用户可解除此限制,最低会员价为 2.83 欧元 / 月(约 3.08 美元)。

第 2 步:登陆后点击左侧菜单栏中的 “AI Tools” 然后选择 “AI Extender (Beta)” 进入工具界面,之后点击 “Open Image” 上传你要扩展的图片。

第 3 步:滑动 “Zoom Out” 确定你要扩展的图片最终大小。你也可以点击 “Custom size” 自定义最终图片大小,之后点击 “Generate” 开始对图片进行扩展;

第 4 步:几秒钟后会生成 3 张不同的扩展图片供你选择。如果不满意,你还可以生成更多。确定你要的最终图片后,点击 “Apply” 按钮。之后,点击 “Download” 下载到本地。

使用感受

优点:我使用 Fotor 向外扩展了 5 张图片的背景,Fotor 在几秒钟内都成功完成了,且我也在结果中找到了我满意的一张。

缺点:Fotor 讲它的扩展器可以使用 AI 在图片内部生成新元素,在图片外部生成定制的背景,我找了很久,没有找到操作入口。浪费了我很多时间。

#2. Photoshop Generative Fill

Photoshop 最新 2024 版引入了 Generative Fill 功能,该功能允许你扩展图像的画布尺寸,然后利用 AI 技术生成与原始内容无缝融合的扩展部分。与 Photoshop 传统的 Content Aware Fill 图像扩展功能相比,Generative Fill 的生成效果更加逼真、自然。Generative Fill 还可以让你移除或者新增图像中的物体或者元素,然后自动混合周围像素以填补缺口。

如何使用 Generative Fill 扩展图像?

第1步:准备 

下载安装 Creative Cloud 桌面应用程序获取最新的 Photoshop 2024 版本。

第2步:扩展画布

导入你要扩展的图片,点选裁剪工具,然后左右拖动剪边框向外扩展画布。释放鼠标按钮,Photoshop 将用默认的背景颜色填充额外的画布。

第3步:选择扩展区域

切换到矩形选框工具,在导入的图片周围绘制选择轮廓,注意不要贴着图片边缘绘制,往图片里面稍微靠一些,以便实现无缝融合。然后,点选反向选择选定扩展区域。

第4步:启用 Generative Fill 

紧靠图片有一个任务栏,找到并单击 Generative Fill 按钮。在 Generative Fill 文本命令框中,留空以便让 Photoshop 用与原始照片相匹配的内容填充该区域。点击 “生成”,一个进度条将出现。

第6步:见证魔法 

几秒钟后,新扩展的画布将被新的、原创的 AI 生成内容充满。新生成的部分与原图片无缝集成,并保持光照、阴影、透视甚至景深。

第7步:3 个变体

在属性面板中,你会发现 3 个扩展图片变体。使用左右箭头在它们之间切换,选择你最满意的一个。

第8步:使用 Remove Tool 进行精细调整(可选) 

如果生成的扩展图片中有一些你觉得多余的元素,你可以调用 Photoshop 的 Remove Tool 去抹除这些元素,抹掉的部分 AI 会自动根据周围内容补充一致。

使用感受

优点:Generative Fill 可以迅速生成图像要扩展的部分,每个像素都与原图的光照、透视、色彩和阴影相匹配,因此非常逼真,难以察觉其是经过编辑的。

缺点:生成的结果通常都是令人满意的,不过有时也会表现不佳,特别是图像包含复杂或特殊图像元素时。

#1. Canva Magic Expand

Canva 的 Magic Expand 图像扩展工具利用 AI 技术生成图像框架外的内容,以产出不同尺寸和宽高比的图像用于社交媒体、广告素材、海报和信息图表、网站设计等等,避免图片被强制放大或裁剪而影响用户体验。Canva Magic Expand 预设了常用的图片宽高比供你选择扩展,也允许你自由定制你想要的宽高比。扩展后的图像会自动匹配原始图像的颜色和风格,保持整体一致。

如何使用 Canva AI 图片扩展器?

第 1 步:去到 Canva 官网, https://www.canva.com/,免费注册一个账号;

第 2 步:点击顶部导航 Design Spotlight 菜单下的 Photo Editor 选项,然后点击 Upload your image 按钮上传一张你要扩展的图片;

第 3 步:选中你上传的图片,然后点击左侧 Magic Expand 图标。因为 Magic Expand 是一个付费功能,这时会提示你订阅 Canava,月费为 $14.99。你可点击 Free trial 试用 30 天再决定是否订阅;

第 4 步:接下来选择你要将图片扩展到的尺寸。你可以自由定义或者直接选择给定的宽高比,例如 1:1、16:9、5:4、4:5、4:3、3:4、3:2、2:3 等等。选定之后点击 Magic Expand 按钮开始图片扩展;

第 5 步:10 几秒后你就会看到扩展出的图片了,一次生成 4 张供你选择。如果你对这 4 张都不满意,可点击 Generate new results 按钮进行再次扩展;

第 6 步:当你得到你满意的扩展图片后,点击 Resize & Magic Switch 按钮对扩展出的图片尺寸进行确认或再次调整;

第 7 步:当你完成 Resize & Magic Switch 后,可直接点击右上角的 Download 或者 Share 按钮进行下载了。Canva 提供有 PNG, JPG 等格式供你选择。

使用感受

优点:能够快速生成符合我需求的扩展图片,而且图片质量也很不错。

缺点:操作逻辑有点费解,特别是 Resize & Magic Switch 部分,导致有几次想要放弃使用。