JXL to BMP Converter

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Convert your JXL (JPEG XL) images to the uncompressed BMP (Bitmap) format.

✓ Batch Conversion✓ 24-bit & 32-bit Output✓ Transparency Control✓ Optional Resizing✓ Filename Customization✓ Client-Side Processing

Click to select JXL files or drag & drop

(Max 10MB per file. Client-side conversion may take time.)

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Why Convert JXL to BMP?

While JXL (JPEG XL) is a modern, highly efficient image format, converting to BMP (Bitmap) can be necessary for specific, often legacy, applications or workflows:

  • Legacy System Compatibility: Some older software, hardware, or specialized systems may only support BMP as an input format.
  • Uncompressed Data: BMP files are typically uncompressed, meaning they store pixel data directly. This can be useful for applications that require raw, uncompressed image data without any loss from compression artifacts (beyond what might have been introduced in the original JXL if it was lossy).
  • Simplicity: The BMP format is relatively simple, making it easy for some applications to parse and process.
  • Specific Graphics Software: Certain niche graphics programs or game development tools might prefer or require BMP for textures or assets.

Key Features of This Converter

Flexible BMP Output

  • • **Batch JXL to BMP:** Convert multiple JXL files simultaneously.
  • • **Color Depth Options:** Choose between 24-bit (RGB) or 32-bit (RGBA) BMP output.
  • • **Transparency Handling:** JXL supports transparency. You can choose to flatten transparent areas against a customizable background color, as 24-bit BMP does not support transparency and 32-bit BMP alpha is often ignored by viewers.

Customization & Control

  • • **Optional Resizing:** Resize images by width, height, or percentage before converting.
  • • **Filename Customization:** Add prefixes or suffixes to your output BMP filenames.
  • • **Download Options:** Download files individually or as a ZIP archive.
  • • **Client-Side Processing:** All processing is done directly in your browser; files are not uploaded.

How to Convert JXL to BMP

  1. Upload JXL Files: Drag and drop your JXL images, or click to select files. The tool will decode them in your browser.
  2. Adjust Settings (Optional):
    • **BMP Options:** Select 24-bit or 32-bit color depth.
    • **Transparency:** Choose whether to flatten transparency and select a background color.
    • **Resize:** If needed, enable resizing and set new dimensions or a percentage.
    • **Naming:** Add a prefix or suffix for the output filenames.
  3. Convert: Click the Convert JXLs to BMP button.
  4. Download: Download your converted BMP files.

Frequently Asked Questions

What is JXL (JPEG XL)?

JXL (JPEG XL) is a royalty-free raster-graphics file format that supports both lossy and lossless compression. It is designed to be a universal image format, offering better compression than JPEG, GIF, and PNG, while also supporting features like animation, transparency (alpha channel), and progressive decoding.

Will the BMP file be larger than the original JXL?

Yes, significantly. JXL is a highly compressed format, while BMP is typically uncompressed. Converting from JXL to BMP will almost always result in a much larger file size, as BMP stores pixel data directly without advanced compression.

What happens to transparency in JXL files when converting to BMP?

JXL supports transparency (alpha channel). While 32-bit BMP technically has an alpha channel, it's often not fully supported or displayed correctly by many viewers and applications. 24-bit BMP does not support transparency at all. Therefore, it's generally recommended to enable the "Flatten Transparency" option and choose a background color to ensure consistent appearance in the output BMP.

Are my images uploaded to a server?

No, all image decoding and conversion are performed directly in your web browser using JavaScript and WebAssembly. Your files are not sent to any external server, ensuring your privacy and security.

Why does it take a moment to load JXL files?

Browsers do not natively support JXL. This tool uses a client-side WebAssembly library (`@jsquash/jxl`) to decode the JXL file into raw pixel data that the browser's canvas can understand. This decoding process happens entirely in your browser and can take a few seconds depending on the file size and the performance of your device. The WebAssembly module itself is loaded dynamically on demand.

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