BMP to PNG

What is BMP?

BMP (Bitmap) is a raster image format developed by Microsoft for Windows and introduced in the late 1980s. A BMP file stores pixel data as an uncompressed bitmap, typically using 1-bit, 8-bit, 16-bit, 24-bit or 32-bit color depths. Because no compression is applied, BMP files are extremely large — a single 1920×1080 24-bit image is around 6 MB. BMP also supports basic alpha transparency in its 32-bit variant, though many older applications ignore it.

BMP's simplicity made it a common interchange format inside Windows for many years, and it is still produced by scanners, screen-capture tools, point-of-sale systems and some legacy applications. However, its enormous file size makes BMP unsuitable for the web, email attachments, mobile apps or any context where storage or bandwidth matters. Converting BMP to PNG keeps the lossless quality while shrinking the file by 50–90% with universal compatibility.

What is PNG?

PNG (Portable Network Graphics) is a lossless raster image format introduced in 1996 as a patent-free replacement for GIF. PNG uses lossless DEFLATE compression, which means no image data is ever discarded — the decoded pixels are identical to the original. PNG also supports a full alpha channel for transparency, making it the preferred format for icons, logos, UI elements, screenshots and any graphic that needs crisp edges or a transparent background.

PNG is supported by every modern browser and virtually all image software. It is the ideal image format when exact quality and transparency matter more than a small file size. Converting your BMP image to PNG keeps every pixel intact while drastically reducing file size and ensuring the file can be opened, edited and shared everywhere.

BMP vs PNG comparison

Both BMP and PNG are lossless raster formats, but they were designed in different eras and behave very differently. BMP stores pixels uncompressed, while PNG compresses them losslessly. The table below compares the key features of each format side by side to help you choose the right output when you convert BMP to PNG.

Feature	BMP	PNG
Year introduced	1985 (Windows)	1996
Compression	None (uncompressed)	Lossless (DEFLATE)
Image quality	Lossless, pixel-perfect	Lossless, pixel-perfect
Max color depth	32-bit (RGBA)	8-bit or 16-bit, RGBA
Transparency	Limited (32-bit, often ignored)	Full alpha channel
File size	Very large (uncompressed)	Much smaller (typically 50–90% smaller than BMP)
Browser support	Limited (basic in most browsers)	Universal
Software compatibility	Good on Windows, limited elsewhere	Near-universal
Best for	Windows-specific interchange, scanning	Logos, icons, screenshots, archiving, web

When to use BMP to PNG conversion

Converting BMP to PNG is the natural choice whenever you need to keep lossless quality and any transparency while shrinking the file size and gaining universal compatibility. Here are the most common reasons to convert a BMP image to PNG:

• Smaller lossless files. PNG compresses losslessly, so a PNG is typically 50–90% smaller than the equivalent BMP with zero quality loss.
• Cross-platform sharing. PNG is universally supported on Windows, macOS, Linux, iOS and Android, while BMP support varies outside Windows.
• Logos, icons and UI graphics. PNG keeps text and sharp lines crisp, with full alpha-channel transparency for clean overlays.
• Screenshots and technical images. PNG avoids the blocky artifacts that lossy formats produce around edges, text and flat colors.
• Email and document workflows. Outlook, Word, PowerPoint and PDF tools embed PNG reliably; BMP files bloat documents unnecessarily.
• Lossless archiving. PNG preserves every pixel exactly, making it an excellent master format for images you may edit again later.

Keep your original BMP file as a backup if you need an uncompressed master. Use the PNG export for everyday sharing, web publishing and archiving where lossless quality plus a smaller file size is the right balance.

How to convert BMP to PNG

Converting a BMP image to PNG with this tool takes only a few seconds and happens entirely in your browser — no uploads, no sign-up, no watermark. The tool decodes your BMP with the browser's image engine and re-encodes it as a lossless PNG through the Canvas API. Follow these three simple steps to convert your BMP to PNG:

1. Upload your BMP. Click the upload area above or drag and drop a .bmp file. Your image is previewed instantly.
2. Convert. Click the "Convert to PNG" button. The BMP is decoded and re-encoded as a lossless PNG image.
3. Download PNG. Click "Download PNG" to save the converted file to your device. Your original BMP stays untouched.

Because every step runs locally in your browser using JavaScript, your BMP image is never uploaded to a server. This makes the conversion completely private, fast and suitable for sensitive or confidential images.