JPG 转 BMP 在线转换器

只需 3 步，轻松将您的 JPG 文件转换为 BMP 格式。

BMP⌄

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⚙ 可选设置

Resize

Color Filter

DPI

dpi

Crop (px)

JPG vs BMP：完整格式指南

JPG

Lossy

压缩

BMP

None

JPG

Not supported — transparent areas always render as solid white or the specified matte color

透明度

BMP

Only in 32-bit BMP via BITMAPV4/V5HEADER alpha channel — inconsistently supported by applications

JPG

Not supported

动画

BMP

Not supported

JPG

24-bit (8 bits per channel: RGB) — up to 16.7 million colors

色彩深度

BMP

1-bit monochrome to 32-bit RGBA — most common use is 24-bit (16.7 million colors)

JPG

50 KB – 5 MB per image depending on resolution and quality setting

文件大小

BMP

3 MB – 25 MB per image — a 1920×1080 24-bit BMP is approximately 5.9 MB

JPG

Universal — all browsers, all operating systems, all devices including IE6 and older smartphones

浏览器支持

BMP

Technically supported by most browsers but virtually never used on the web due to enormous file sizes

JPG

Photos, web images

最适合

BMP

Legacy Windows apps

常见使用场景：JPG → BMP

🖥️ Windows wallpaper format⚙️ Legacy Windows software🔧 Industrial machine input📟 Embedded display systems

⚠️BMP output will be 5–15× larger than the source JPG. Unless a legacy system specifically requires BMP, PNG provides the same lossless quality at a fraction of the file size.

Format

JPG

Standardized in 1992 by the Joint Photographic Experts Group, JPEG became the internet's dominant image format through the 1990s. Its DCT compression made digital photography practical for early web a…

优点

+Smallest file sizes for photographs (10:1 to 20:1 compression ratio)

+Universal compatibility across every device, software, and platform

+Embeds EXIF metadata (GPS, camera settings, date/time)

+Adjustable quality/size trade-off at save time

局限性

−Lossy — permanently discards image data with every save

−No transparency — backgrounds are always solid

−Visible block artifacts on sharp edges, text, and high-contrast areas

−Quality degrades with each re-save (generational quality loss)

Sharing photographs on social media, email, or blogsCamera images where file size matters more than pixel perfectionWeb page photos where page load speed is the priorityAny context requiring maximum cross-device and software compatibility

Format

BMP

BMP (Device-Independent Bitmap) was introduced by Microsoft with the Windows 3.0 SDK in 1990 as the native raster format for Windows. It stores pixel data with zero compression, ensuring perfect repro…

优点

+Zero compression artifacts — the highest possible fidelity for raw storage

+Simple, well-documented format trivial to read/write programmatically

+Universal support across all Windows software and development tools

+Direct pixel data access with no decoding overhead

局限性

−Extremely large files — a 1080p image is ~6 MB vs ~300 KB as JPG

−No practical web use — impractically large for any internet delivery

−Limited support outside Windows ecosystem

−No meaningful advantages over PNG for any modern use case

Legacy Windows applications that exclusively require BMP formatAutomated Windows image processing pipelines as an intermediate formatSystem resource files (wallpaper, specific application bitmaps)When absolute raw pixel fidelity is needed and file size is irrelevant

将 JPG 转换为 BMP

BMP是Windows的基础位图格式，被操作系统原生用于壁纸、图标和旧版软件。将JPG转换为BMP会删除所有压缩以生成原始像素数据——最简单的图像表示形式。虽然生成的文件很大，但它们可以即时加载而无需解码步骤。

何时将 JPG 转换为 BMP

⚙️

Windows原生

BMP是Windows壁纸、自定义光标和系统资源的操作系统级格式。

🎮

复古游戏开发

RPG Maker等经典游戏引擎需要BMP用于精灵、图块集和启动屏幕。

🔬

科学成像

实验室和医学成像软件需要未压缩的BMP以进行精确的像素级处理。

🛠️

直接像素访问

BMP的简单结构允许无需解码器的直接内存访问——非常适合实时使用。

JPG vs BMP — 格式对比

属性	JPG (input)	BMP (output)
Format type	Raster	Raster
Compression	Lossy	None
Transparency	No	No
Best used for	Photos, web images	Legacy Windows apps
File size	Small	Very Large

ℹ️ Important note

BMP文件可能比同等JPG文件大10-20倍。在批量将大型图像库转换为BMP之前，请验证目标系统是否有足够的存储空间。

如何将 JPG 转换为 BMP？

上传您的 JPG 文件

点击「选择文件」或将您的 JPG 图片拖放上传。

选择 BMP 作为输出格式

从下拉菜单中选择「BMP」作为所需输出格式。

转换文件

点击「立即转换」开始将 JPG 文件转换为 BMP。

下载 BMP 文件

转换完成后，下载您已转换的 BMP 文件。

JPG

文件扩展名.jpg
描述JPEG (Joint Photographic Experts Group) is the most widely used lossy image compression format, ideal for photographs and complex images with many colors. JPEG achieves small file sizes by discarding some image data, making it perfect for web use and sharing.
相关程序Adobe Photoshop, GIMP, Windows Photo Viewer, Preview (Mac)
开发者Joint Photographic Experts Group
MIME 类型image/jpeg

BMP

文件扩展名.bmp
描述BMP (Bitmap) stores uncompressed bitmap digital images independently of the display device. Large file sizes but no quality loss.
相关程序Microsoft Paint, Adobe Photoshop, GIMP, MS Photo Editor
开发者Microsoft
MIME 类型image/bmp