BMP Decoder

Decode BMP files to extract detailed metadata, color information, and pixel data with visual preview.

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6,460+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how BMP Decoder processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

This BMP Decoder tool allows you to upload any BMP (Bitmap) image file and extract comprehensive information about its structure. The tool parses the BMP file header, DIB header, color table (if present), and pixel data. It supports various BMP formats including 1-bit monochrome, 4-bit and 8-bit indexed color, 16-bit high color, 24-bit true color, and 32-bit with alpha channel. The decoder displays file size, dimensions, color depth, compression type, and provides a hexadecimal view of pixel data. For indexed color BMPs, it extracts the color palette. All processing happens securely in your browser with optional server-side fallback for large files.

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How to Use

Click the upload area or drag & drop a BMP file
Select output format (JSON or Table view)
Click 'Decode BMP' button
View extracted metadata, color table, and pixel data
Use 'Download Results' to save the decoded information
Upload another file to decode a different BMP

Frequently Asked Questions

Find Quick Answers

What BMP formats does this decoder support?

The decoder supports all standard BMP formats: 1-bit monochrome, 4-bit and 8-bit indexed color (with color tables), 16-bit high color (RGB555/RGB565), 24-bit true color (RGB), and 32-bit with alpha channel (RGBA). It handles both uncompressed and RLE-compressed BMP files.

Is there a file size limit for BMP decoding?

For client-side decoding, files up to 50MB work reliably in most browsers. For larger files, the tool automatically uses server-side processing via the logic.php backend, which can handle files up to 100MB depending on server configuration.

What information does the BMP decoder extract?

The decoder extracts: File header (signature, file size, reserved values), DIB header (dimensions, color depth, compression, image size), color table (for indexed formats), and raw pixel data. It also calculates additional metrics like expected file size and validates BMP structure.

Can I download the decoded results?

Yes, after decoding, you can download the results as JSON or CSV format using the 'Download Results' button. The JSON includes all metadata and a sample of pixel data, while CSV provides tabular format for color tables and pixel values.

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