JSONToTable

Loading Base64 to Image Converter...

How to Convert Base64 to BMP Image - Step by Step Guide

Step 1

Paste Your Base64 String

Start by pasting your Base64 encoded BMP string into the input area. The decoder accepts Base64 strings with or without the data URI prefix.

•
Paste Base64: Copy your Base64 BMP string from APIs, databases, or files and paste it into the input field
•
With or without prefix: Works with data:image/bmp;base64, prefix or pure Base64
•
Try the sample: Click "Sample" to load an example Base64 BMP string
•
Privacy guaranteed: All decoding happens in your browser - your data never leaves your device

Why BMP Format?

BMP (Windows Bitmap) is useful for Base64 decoding in these scenarios:

✓
Windows compatibility: Native format for Windows applications
✓
Paint editing: Perfect for opening in Windows Paint for modifications
✓
Uncompressed data: Raw pixel data without compression
✓
Legacy support: Works with older Windows software

Note: For smaller files and better web compatibility, consider decoding to PNG format instead.

Step 2

Instant Automatic Decoding

The tool instantly decodes your Base64 string and displays the BMP image automatically! You'll see a preview of your decoded BMP image.

•
Instant decoding: Automatic conversion happens immediately after pasting - no waiting required
•
BMP preview: See your decoded BMP image with original quality
•
Image details: View dimensions, file size, and format information
•
Local processing: Everything happens on your device using browser atob() API for maximum privacy and speed

Understanding Base64 to BMP Decoding

When your Base64 string is decoded to BMP:

→
Text to binary: Base64 ASCII text is converted back to binary BMP data following RFC 4648 standards
→
BMP restoration: Binary data is reconstructed into a valid BMP image with uncompressed pixels
→
Quality preserved: Original image quality is fully maintained (no transparency in BMP)
→
Large file size: Decoded BMP will be larger than compressed formats per MDN image types
Step 3

Download Your BMP Image

Once decoding is complete (happens automatically!), you can download your BMP image or copy it for use in other applications.

•
Download as BMP: Click the "Download" button to save your BMP image file to your computer
•
Copy to clipboard: Copy the image for pasting into Windows Paint or other applications
•
Edit in Paint: Open the BMP directly in Windows Paint for modifications
•
Decode more: Click "Clear" to decode another Base64 string

Common Use Cases

Popular scenarios for Base64 to BMP conversion:

→
API responses: Decode BMP images received from legacy APIs or databases
→
Email attachments: Extract BMP images from Base64 encoded email data
→
Database retrieval: Convert Base64 stored images back to BMP files as per W3C standards
→
JSON data: Extract BMP images from JSON data structures

Frequently Asked Questions

Why decode Base64 to BMP instead of PNG?

BMP is useful if you need to edit the image in Windows Paint (BMP is its native format), or if you're working with legacy Windows applications that require BMP. For most modern uses, decoding to PNG is better due to smaller file sizes and transparency support.

Will the decoded BMP be large?

Yes, BMP files are uncompressed and typically 10-20 times larger than compressed formats like PNG or WebP as explained by BMP format specifications. A Base64 string of 400 KB might decode to a 6 MB BMP file. This is why BMP is not recommended for web use or storage per web performance guidelines.

Is this Base64 to BMP decoder free?

Yes, completely free! No watermarks, no registration, unlimited conversions. All decoding happens in your browser using the FileReader API for privacy and speed. Decode as many Base64 strings as you need.

Can I convert BMP back to Base64?

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

Does BMP support transparency?

No, standard BMP files don't support transparency. If your Base64 data originally had transparency (from a PNG, for example), it will be converted to a solid white background when decoded as BMP. For transparency, use Base64 to PNG instead.

Is my Base64 data safe?

Absolutely! All decoding happens locally in your browser using JavaScript. Your Base64 strings never leave your device, ensuring complete privacy and security. No server upload, no data storage.

Related Tools

BMP to Base64

Convert BMP/Bitmap images to Base64 encoded strings

BMP to Base64

Convert BMP images to Base64 encoded strings

Base64 Validator

Validate Base64 encoded strings with detailed format checking and content type detection

Image to Base64

Convert images to Base64 encoded strings for embedding in HTML, CSS, and APIs

Base64 to Image

Decode Base64 encoded strings to view and download images (PNG, JPG, GIF, SVG)

PNG to Base64

Convert PNG images to Base64 encoded strings for embedding