BMP 转 PNG 在线转换器

只需 3 步，轻松将您的 BMP 文件转换为 PNG 格式。

PNG⌄

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⚙ 可选设置

Resize

Color Filter

DPI

dpi

Crop (px)

在线将 BMP 转换为 PNG — 免费快速

BMP是未压缩的Windows专有格式——可靠，但对于大多数现代需求不实用。将BMP转换为PNG可以获得通常小60-80%的无损格式，同时完美保留每个像素。PNG还增加了BMP完全缺乏的Alpha通道透明度支持。

为什么将 BMP 转换为 PNG？

📉

60-80%尺寸缩减

PNG以零质量损失将BMP文件压缩60-80%，使其易于存储和共享。

🎨

添加透明度

转换为PNG，然后在任何编辑器中添加Alpha通道透明度——这是BMP无法做到的。

🌐

网络就绪

浏览器原生显示PNG。任何网络浏览器都不支持BMP——需要PNG。

🔧

跨平台

PNG可在Windows、macOS、Linux、iOS和Android上运行。BMP实际上只适用于Windows。

如何将 BMP 转换为 PNG？

上传您的 BMP 文件

点击「选择文件」或将您的 BMP 图片拖放上传。

选择 PNG 作为输出格式

从下拉菜单中选择「PNG」作为所需输出格式。

转换文件

点击「立即转换」开始将 BMP 文件转换为 PNG。

下载 PNG 文件

转换完成后，下载您已转换的 PNG 文件。

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

PNG

文件扩展名.png
描述PNG (Portable Network Graphics) is a lossless raster image format that supports transparency. Ideal for graphics, logos, icons, and images that require a transparent background.
相关程序Adobe Photoshop, GIMP, Microsoft Paint, Preview (Mac)
开发者PNG Development Group
MIME 类型image/png

✅

Pro tip: BMP文件通常没有DPI元数据。如果打印尺寸重要，请使用任何图像编辑器在转换后在PNG中设置正确的DPI。

免费 BMP 转换工具

格式指南

BMP vs PNG：完整格式指南

功能

BMP （源）

PNG （目标）

🗜️压缩

None

Lossless

🔍透明度

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

Full 8-bit alpha channel — each pixel can be any opacity level from fully transparent (0) to fully opaque (255)

🎬动画

Not supported

Not in standard PNG; APNG (Animated PNG) is a non-standard extension with limited, inconsistent support

🎨色彩深度

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

24-bit RGB (16.7M colors) or 32-bit RGBA (16.7M colors + full alpha); up to 48-bit for professional workflows

📦文件大小

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

100 KB – 10 MB — significantly larger than JPG for photographic content

🌐浏览器支持

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

Universal — all modern browsers, operating systems, and devices including IE7+

🏆最适合

Legacy Windows apps

Graphics, logos, UI

常见使用场景：BMP → PNG

🌐 Web graphics preparation🎨 Design software import📤 Cross-platform file sharing💾 Lossless size reduction

⚠️This is one of the most recommended BMP conversions — you get identical lossless quality at 50–70% smaller files, plus added transparency support and universal cross-platform compatibility.

BMP

关于 {from} 格式 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 reproduction across all hardware. BMP dominated early Windows computing for wallpapers, icons, and application graphics. As the internet grew, its massive file sizes made it impractical for any networked use, displacing it with JPG, PNG, and WebP.

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

使用时机

→Legacy Windows applications that exclusively require BMP format

→Automated Windows image processing pipelines as an intermediate format

→System resource files (wallpaper, specific application bitmaps)

→When absolute raw pixel fidelity is needed and file size is irrelevant

提示

•PNG achieves identical lossless quality to BMP at 50–70% smaller file sizes

•Convert to JPG for a 95%+ file size reduction with visually excellent quality

•24-bit BMP and 24-bit PNG are visually identical — PNG is always the better choice

•There are essentially no modern use cases where BMP is preferable to PNG

PNG

关于 {from} 格式 PNG

PNG was created in 1996 as a free, patent-unencumbered alternative to GIF after Unisys enforced its LZW compression patent. The PNG Development Group introduced full-color support, genuine alpha transparency, and superior lossless compression. It quickly became the web standard for logos, UI elements, and any image requiring a transparent background — a role it dominates to this day.

优点

+Lossless — every pixel preserved with zero compression artifacts

+Full 8-bit alpha channel for smooth, semi-transparent edges

+Ideal for text, logos, and graphics where sharpness is non-negotiable

+Unlimited re-saves without any quality degradation whatsoever

+Supports up to 48-bit color depth for professional color workflows

局限性

−3–5× larger than JPG for photographic content

−No native animation support in standard PNG

−Slower to load than WebP for equivalent image content

−Not practical for very high-resolution photographs at web scale

使用时机