Free Tool

Free BMP to PNG Converter

Convert BMP to PNG directly in your browser. No server uploads. No file size limits. No data tracking.

By SEOWebster Team ·

Drop your BMP images here or click to upload

Output: PNG  ·  Batch upload supported  ·  No file size limit

🔒 No Upload, Local Processing Only
∞ No File Size Limit
✓ 100% Free, No Account Needed
⚡ Instant Batch Convert
✓ No Watermarks Ever

BMP vs PNG: Technical Comparison

Understanding the key differences helps you choose the right format and conversion approach for every project.

Property B BMP (source) P PNG (output)
Compression None (raw uncompressed pixels) Lossless
Colour Depth 16 million (24-bit) 16 million (24-bit)
Transparency Limited (not widely supported) Full alpha channel
Software Support Windows-native; limited elsewhere Universal, all apps & browsers
Typical File Size Very large (largest common format) Medium (2–5× larger than JPG)
Best Used For Windows system graphics, raw archival sources Logos, screenshots, design assets, editing

Why Convert BMP to PNG?

BMP files are completely uncompressed, a 1920×1080 screenshot can be 6MB as a BMP but under 500KB as a PNG. PNG provides lossless compression that reduces BMP file sizes by 60–90% while preserving every pixel perfectly. PNG is universally compatible and eliminates the storage and bandwidth burden of BMP.

Top reasons to convert BMP to PNG:

  • Ensure compatibility with software, platforms, and services that require PNG format
  • Reduce file size for faster web loading, email sharing, and cloud storage
  • Meet professional, client, or platform submission requirements in PNG
  • Optimise images for Google PageSpeed, Core Web Vitals, and SEO performance

100% Browser-Based, Your Files Never Leave Your Device

This BMP to PNG converter uses your browser's native HTML5 Canvas API and FileReader API to process images entirely on your CPU, no server involved. When you click "Convert", your image data is decoded, rendered to an off-screen canvas, and re-encoded to PNG format, all inside your browser's sandboxed JavaScript environment.

Why we built it this way: Most online converters upload your files to remote servers, store them temporarily, and may expose them to third parties. At SEOWebster, we believe your creative work is private. Our code processes files locally on your machine, we receive zero data, have zero access to your images, and store nothing. Ever.

How to Convert BMP to PNG Without Losing Quality

No software installation. No account. No upload. Everything runs in your browser in under 30 seconds.

1

Select Your BMP Files

Drag & drop one or more BMP files into the upload area, or click to browse. Batch upload is fully supported, convert unlimited files at once.

2

Output Pre-Set to PNG

The output format is already set to PNG, no selection needed. Use the dropdowns above to switch to a different conversion pair if needed.

3

Click Convert, Instantly Local

Hit the Convert button. Processing happens using your CPU via the HTML5 Canvas API. No server, no wait time, no file size limit.

4

Download Your PNG

Click the download button next to each converted file. Your PNG saves directly to your device at maximum quality, no watermarks, no limits.

Other Popular BMP Conversions

Convert BMP to other popular formats

BMP → JPG

Other Popular PNG Conversions

Other converters that output PNG format

PNG → JPG WEBP → PNG GIF → PNG AVIF → PNG

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Frequently Asked Questions

Common questions about converting BMP to PNG

How much smaller is PNG compared to BMP?
Typically 60–90% smaller. A 5–8MB BMP screenshot typically compresses to under 1MB as PNG with zero quality loss. Reduction depends on content, screenshots with lots of flat colour compress the most.
Is there any quality difference between BMP and PNG?
No. PNG uses lossless compression, preserving every pixel value exactly. There is zero visual difference between a BMP and its PNG equivalent.
Why is BMP such a large file format?
BMP (Bitmap) stores raw, uncompressed pixel data, every pixel's RGB values stored individually with no compression. Even simple images produce enormous file sizes. PNG applies lossless compression to the same data, resulting in files 60–90% smaller.
Is there a file size or quantity limit?
No file size limit. Because all processing happens in your browser using the HTML5 Canvas API, there are no server-imposed restrictions. The practical limit is your device's available RAM, most modern devices handle images up to 50–100MB each with no issues. Batch convert as many files as you need in one session.
Are my BMP images secure when converting?
Completely secure. All BMP to PNG conversion processing happens in your browser using client-side APIs (HTML5 Canvas + FileReader). Your images never leave your device, no file is uploaded to any server, and SEOWebster has zero access to your image content at any point in the process.
Can I convert multiple BMP images to PNG at once?
Yes. Batch upload is fully supported, drop as many BMP files as you need at once and convert them all in a single click. Each converted PNG file downloads individually. There is no limit on the number of files you can process in one session.
Does converting BMP to PNG reduce image quality?
Our converter uses maximum quality (100%) settings for all output formats. For lossless-to-lossless conversions (e.g. PNG → WebP lossless), there is zero quality loss. For conversions involving a lossy format (e.g. anything to JPG or WebP lossy), the compression is set to maximum quality, making any difference invisible to the human eye in normal use. Always keep a backup of your original BMP files for archival purposes.