图片转 Base64
将图片转换为 Base64 数据 URI
上传图片
拖放图片到此处或点击选择
支持批量上传
使用方法
上传您的文件
拖放文件或点击浏览。您的文件留在浏览器中。
调整设置
配置选项以获得您所需的精确结果。
下载结果
即时处理并下载您的文件——无需等待，无需上传至服务器。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
您的文件保持私密
此工具完全在您的浏览器中处理文件。不会上传至任何服务器——您的数据永远不会离开您的设备。
- 无服务器上传——100% 客户端处理
- 不存储数据——关闭标签页时文件即被丢弃
- 无需账号——无需注册即可立即使用
Image to Base64: Encode Images as Text for Web Development
Key Points
- Base64 encodes binary image data as ASCII text, embeddable directly in HTML and CSS
- Eliminates extra HTTP requests—ideal for small icons, logos, and UI elements
- Base64 increases data size by approximately 33%, so it's best for images under 10 KB
Base64 encoding converts image files into text strings that can be embedded directly in HTML, CSS, or JavaScript. This technique eliminates separate HTTP requests for small images, reducing page load latency. It's a standard practice in web development for inline icons, email templates, and single-file applications.
33%
Size increase from Base64 encoding
Key Concepts
Data URIs
Base64 images use data URI format: data:image/png;base64,iVBOR... This self-contained string can replace any image URL in HTML src attributes or CSS background properties.
Inline vs External Images
Each external image requires a separate HTTP request. For small images (under 10 KB), the overhead of the request itself can exceed the image size. Inlining via Base64 eliminates this overhead.
Size Trade-off
Base64 encoding increases data size by approximately 33%. A 6 KB image becomes 8 KB as Base64. For small assets this is acceptable; for large images, external files are more efficient.
Email HTML Templates
Many email clients block external images by default. Base64-embedded images display immediately without requiring the recipient to 'load images,' making them reliable for email signatures and newsletters.
Best Practices
Only Base64-encode images under 10 KB—larger images are more efficient as separate files with browser caching.
Use Base64 for critical above-the-fold icons and logos that must appear instantly without extra network requests.
In CSS, embed Base64 images as background-image data URIs to reduce render-blocking requests.
For React/Next.js projects, import small images directly—the bundler automatically inlines them as Base64 when under the size threshold.
All encoding happens locally in your browser. No images are uploaded to any server. The generated Base64 string contains the complete image data.