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How to Convert BMP to Base64 - Step by Step Guide

Step 1

Upload Your BMP Image

Start by uploading your BMP/Bitmap image file. Click the "Upload Image" button or simply drag and drop your BMP file into the designated area.

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Click to upload: Click the upload area or the "Upload Image" button to select your BMP file from your computer
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Drag and drop: Simply drag your BMP file directly into the upload area for instant processing
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Try the sample: Click "Sample" to load a demo BMP image and see how the converter works
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Size limit: Supports BMP files up to 10MB in size
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Privacy guaranteed: All conversions happen in your browser - your images never leave your device
Step 2

Instant Automatic Conversion

The tool instantly converts your BMP to a Base64 encoded string automatically! You'll see a preview of your BMP image on the left side and the Base64 output displayed in the editor on the right side.

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Instant conversion: Automatic encoding happens immediately after upload - no waiting or processing delays
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Image preview: See your uploaded BMP image with original dimensions before encoding
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Clean Base64 output: Pure Base64 string ready for use in your applications
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Local processing: Everything happens on your device using browser FileReader API for maximum privacy and speed

Understanding Base64 Encoding

When your BMP is converted to Base64:

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Binary to text: BMP binary data is converted to ASCII text characters following RFC 4648 standards
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Size increase: Base64 encoding increases file size by approximately 33% (BMP files already large!)
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Safe transmission: Ensures your image can be safely transmitted over text-based protocols
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Data URI format: Output is data:image/bmp;base64,...
Step 3

Copy or Download Your Base64 String

Once conversion is complete (happens automatically!), you have multiple options to use your Base64 encoded BMP. Click "Copy" to copy the Base64 string to your clipboard, or "Download" to save it as a text file.

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One-click copy: Click the "Copy" button to instantly copy the entire Base64 string to your clipboard
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Download as file: Save the Base64 string as a .txt file for later use
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Use in HTML: Embed directly in <img src="data:image/bmp;base64,..."> tags
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CSS backgrounds: Use in CSS background-image properties
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Convert more: Click "Clear" to process another BMP image

Usage Example in HTML

Here's how to use your Base64 encoded BMP in HTML:

<img src="data:image/bmp;base64,Qk0..." 
     alt="BMP Image" />

Replace "Qk0..." with your actual Base64 string

Frequently Asked Questions

Why is my BMP to Base64 string so large?

BMP files are uncompressed, making them very large to begin with. Base64 encoding increases the size by another 33%. For example, a 6 MB BMP becomes approximately 8 MB in Base64. For smaller Base64 strings, convert to PNG first (90%+ reduction), then use PNG to Base64.

Can I use BMP Base64 in web pages?

Yes, but it's not recommended due to the large size. BMP Base64 strings can slow down page loading significantly. For web use, convert to PNG or WebP first for much smaller Base64 output. Learn more about Data URIs.

Is this BMP to Base64 converter free?

Yes, completely free! No watermarks, no registration, unlimited conversions. All processing happens in your browser for privacy and speed. Convert as many BMP files as you need.

Can I decode Base64 back to BMP?

Yes! Use our Base64 to BMP converter to decode your Base64 string back to a downloadable BMP image file. The conversion is lossless and reversible.

What's the best format for Base64 encoding?

PNG or WebP are better choices than BMP for Base64 encoding due to compression. PNG maintains quality with 90%+ smaller file sizes, while WebP offers even better compression. Only use BMP Base64 if you specifically need the uncompressed format as per W3C recommendations.

Is my image data safe?

Absolutely! All conversion happens locally in your browser using JavaScript. Your BMP files never leave your device, ensuring complete privacy and security. No server upload, no data storage.

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