🎨 证件照换底色（蓝底 / 红底 / 白底）ID Photo Background Colour Changer
一键把证件照换成蓝底、红底、白底或渐变底：AI 自动识别人像，头发边缘自然，保持原照片像素尺寸，可设置 DPI 和文件大小上限，支持批量换底打包下载。照片只在浏览器本地处理。Change an ID photo background to blue, red, white or a gradient in one click. On-device AI finds the person with natural hair edges, keeps the original pixel size, lets you set DPI and a file-size limit, and batch-converts to a ZIP. Photos never leave your browser.
上传照片后自动换底，预览显示在这里Upload a photo and the new background appears here
照片保持原来的像素尺寸，只替换背景。需要裁剪成一寸、二寸等规格请用“证件照制作”。首次使用会从本站下载约 13 MB 的人像模型。The photo keeps its pixel size — only the background changes. To crop to 1-inch, 2-inch and other sizes use the ID Photo Maker. The first run downloads a 13 MB portrait model from this site.
使用说明与常见问题How-to & FAQ
「证件照换底色（蓝底 / 红底 / 白底）」是什么？What is the ID Photo Background Colour Changer?
一键把证件照换成蓝底、红底、白底或渐变底：AI 自动识别人像，头发边缘自然，保持原照片像素尺寸，可设置 DPI 和文件大小上限，支持批量换底打包下载。照片只在浏览器本地处理。Change an ID photo background to blue, red, white or a gradient in one click. On-device AI finds the person with natural hair edges, keeps the original pixel size, lets you set DPI and a file-size limit, and batch-converts to a ZIP. Photos never leave your browser.
如何使用「证件照换底色（蓝底 / 红底 / 白底）」？How do I use the ID Photo Background Colour Changer?
上传一张或多张证件照，工具自动识别人像并换成蓝底。点色块切换红底、白底等颜色，或用自定义颜色。边缘有残留原背景色时，调大“去除边缘残色”。最后点“下载照片”，多张可以“全部下载”。Upload one or more ID photos; the person is detected and the background turns blue. Click a swatch for red, white and more, or pick a custom colour. Raise “Remove colour fringe” if traces of the old background remain, then download (or download all as ZIP).
证件照蓝底、红底的标准颜色是多少？What are the standard blue and red values?
常用的证件照蓝底是 RGB(67,142,219)（#438EDB），红底是 RGB(217,0,27) 或纯红 #FF0000，白底是 #FFFFFF。不同单位要求可能略有差异，可以用“自定义颜色”精确设置。A common ID blue is RGB(67,142,219) (#438EDB), red is RGB(217,0,27) or pure #FF0000, and white is #FFFFFF. Offices differ slightly — use Custom colour to match exactly.
换底后会改变照片尺寸吗？Does it change the photo size?
不会。照片保持原来的像素尺寸，只替换背景颜色。如果需要裁剪成一寸、二寸等规格或排版冲印，请用“证件照制作”工具。No. The pixel size stays the same and only the background changes. Use the ID Photo Maker to crop to 1-inch, 2-inch and other sizes or to make a print sheet.
头发边缘有原来的颜色怎么办？The hair edge shows the old colour — what can I do?
把“去除边缘残色”往右调，会把边缘向内收一点，去掉原背景的色边；再适当调整“边缘柔和”，让发丝过渡自然。Move “Remove colour fringe” to the right to pull the edge in slightly, then adjust Edge softness for a natural hair transition.
「证件照换底色（蓝底 / 红底 / 白底）」免费吗？文件会上传吗？Is the ID Photo Background Colour Changer free? Are my files uploaded?
「证件照换底色（蓝底 / 红底 / 白底）」完全免费，无需注册。图片只在你的浏览器里处理，不会上传到任何服务器，关闭页面后不留痕迹。The ID Photo Background Colour Changer is free with no sign-up. Images are processed only in your browser, never uploaded to any server, and nothing is kept after you close the page.