BMP to PNG — Modernize Legacy Bitmap Images
Convert Windows BMP to PNG. Compress uncompressed bitmaps into a modern lossless format with much smaller file sizes.
Drop BMP files here or click to select
.bmp (multiple files)
Settings
Files
Converting...
Preparing...
Format comparison
BMP (Bitmap) is a Windows standard uncompressed format, simple but with large file sizes.
Pros
- ✓ Simple structure
- ✓ Wide compatibility
Cons
- ✗ No compression
- ✗ Huge file sizes
PNG (Portable Network Graphics) uses lossless compression and supports transparency. Ideal for logos and screenshots.
Pros
- ✓ Lossless compression
- ✓ Alpha transparency
- ✓ Great for sharp edges
Cons
- ✗ Larger file sizes
- ✗ Inefficient for photos
When to Convert BMP to PNG
Convert BMP to PNG to keep a lossless workflow while reducing file size. Useful for modernizing outputs from older software.
Technical Format Details
BMP Technical Specifications
Technical details
BMP is a simple raster format often seen in older Windows workflows. Many BMPs are uncompressed, which makes files unnecessarily large for modern use.
Good for
- Legacy compatibility: Working with older tools- Temporary data: When you want an uncompressed intermediate
Notes
- File size: Not ideal for the web. Converting to PNG/JPEG usually makes it much easier to handle- Transparency: BMP transparency behavior can be inconsistent across environments
Reference: Microsoft: BMP Format Overview
PNG Technical Specifications
Technical details
PNG is a lossless raster format that preserves pixel data exactly. It supports alpha transparency, which makes it a common choice for logos and UI assets.
Good for
- Logos/icons: Assets that need transparency- Screenshots: Crisp text and line art
Notes
- Photos: Files can be large (WebP/JPEG may be a better fit)- Quality setting: Since PNG is lossless, “quality” controls may have little or no effect
Reference: W3C: PNG 3rd Edition
How to Use
Add files
Drop or click to select your BMP files (multiple supported)
Confirm output
Default is PNG. You can change to another supported output format if needed.
Adjust options
Set quality, resize, and metadata options only if you need them.
Convert & download
Download each file, or download everything as a ZIP for batch outputs.
FAQ
How much smaller will BMP become as PNG?
BMPs are usually uncompressed, so converting to PNG typically reduces file size by 70–90%.
Is there any quality change?
No. PNG uses lossless compression, so quality is perfectly preserved — pixel-identical to the original.
Why is BMP still in use?
Some legacy systems and Windows embedded development still require BMP. Older screenshot tools may also save in BMP format.
Can I keep Exif metadata?
When "Keep Exif/Metadata" is ON, we try to carry over things like capture time, camera info, and GPS where possible. Some tags may be dropped depending on the input, output format, and browser environment. Turn it OFF if you want to remove location data before sharing.
Can I convert multiple files at once?
Yes. You can select multiple files, convert them in one run, and download each file individually. For multiple outputs, you can also download everything as a ZIP. For very large batches, splitting into smaller runs is more stable.
Are my images uploaded to a server?
No. Conversion runs locally in your browser, and your images are not sent to an external server.
What if conversion fails or is slow?
Some formats (like HEIC/HEIF) depend on browser support. If it fails, try another browser, reduce the number of files, or resize before converting.
Why do colors sometimes shift after conversion?
Differences in decoding/encoding and color handling can cause small shifts. For critical images, compare the output against the original.
References
- Microsoft: BMP Format Overview
Official BMP structure and compatibility notes.
- W3C: PNG 3rd Edition
Official PNG/APNG specification reference.
- AOM: AVIF Specification
Normative AVIF container and coding behavior.
- JPEG Committee
Primary standards source for JPEG and JPEG XL.
- Google Developers: WebP
Reference for WebP encoding and support behavior.
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