BMP to HDR Converter

Convert BMP images to HDR format online for free

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Modern Format

BMP is outdated for most purposes — converting to HDR gives you a practical format with better compression and wider modern support.

Batch Support

Queue multiple BMP files and convert them all to HDR at once — saving time when you have many files to process in a single session.

Instant Conversion

The BMP to HDR conversion engine processes files quickly — expect your download to be ready in just a few seconds after uploading.

How to convert BMP to HDR

1

Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.

2

Choose hdr or any other format you need as a result (more than 200 formats supported)

3

Let the file convert and you can download your hdr file right afterwards

About formats

BMP (Bitmap) is a raster image file format developed by Microsoft for the Windows operating system, introduced with Windows 3.0 in 1990. The format stores pixel data in a straightforward structure: a file header specifying dimensions, color depth, and compression method, followed by an optional color palette and then the raw pixel array. BMP supports color depths from 1-bit monochrome through 4-bit and 8-bit indexed color to 16-bit, 24-bit true color, and 32-bit with alpha channel. Most BMP files store pixels uncompressed (BI_RGB), though optional RLE compression is available for 4-bit and 8-bit modes. Pixels are arranged in bottom-up row order by default, with each row padded to a 4-byte boundary. One advantage is absolute simplicity — the format has no complex encoding, filtering, or compression layers, making BMP files trivial to read and write programmatically in any language. This simplicity also means BMP images render with zero decoding overhead, useful in scenarios where decompression latency matters. The format's deep Windows integration is another strength: BMP is the native bitmap format for Windows GDI, clipboard operations, and device-independent bitmap (DIB) handling, ensuring first-class support across the entire Windows ecosystem. While BMP's lack of compression produces large files unsuitable for web use or storage-constrained environments, it remains widely used as an intermediate format in image processing, as a clipboard exchange format, and in embedded systems where decoding simplicity outweighs file size.
Developer: Microsoft
Initial release: 1990
HDR (also known as RGBE or Radiance HDR) is a high-dynamic-range image format created by Greg Ward Larson as part of the Radiance lighting simulation system, developed at Lawrence Berkeley National Laboratory starting in 1985 with the HDR format emerging around 1989. The format stores floating-point RGB pixel values using a compact 32-bit-per-pixel encoding called RGBE (Red, Green, Blue, Exponent): three 8-bit mantissa bytes share a single 8-bit exponent, representing luminance values across a range of roughly 76 orders of magnitude while keeping file sizes comparable to standard 24-bit images. HDR files begin with a text header containing rendering and exposure metadata, followed by the RGBE pixel data compressed with a scanline-oriented run-length encoding scheme. The format captures the full luminance range of real-world scenes — from deep shadows to direct sunlight — enabling physically accurate lighting calculations, tone mapping to different display conditions, and post-capture exposure adjustment without the clipping artifacts inherent in 8-bit formats. One advantage is the format's foundational role in HDR imaging: Radiance HDR pioneered the concept of storing real-world luminance values in image files, and the .hdr format became the standard for light probe images and environment maps used in image-based lighting across the 3D rendering industry. The format's compact encoding is another practical strength — the RGBE scheme provides far more dynamic range than 8-bit formats while using only 33% more storage per pixel, a favorable tradeoff that made HDR practical on storage-limited systems of the late 1980s. HDR files are supported by Photoshop, GIMP, ImageMagick, Blender, and all major 3D renderers.
Developer: Greg Ward Larson
Initial release: 1989

Frequently Asked Questions

Why convert BMP to HDR?

HDR preserves luminance data in Radiance format — useful for 3D rendering, environment mapping, and professional lighting analysis workflows.

How do I open HDR files?

You can open HDR files with Photoshop, Luminance HDR, Photomatix, Blender. Free alternatives are available for every platform.

How much smaller will the HDR be?

Depending on image content and HDR compression, expect file sizes 50-95% smaller than the original BMP. Photographic content typically compresses the most.

Is the conversion process fast?

BMP to HDR conversion usually finishes in a few seconds. Larger files may take slightly longer, but the cloud-based processing keeps things efficient.

Are my files safe during conversion?

Convertio uses encrypted connections for all transfers. Your BMP uploads are deleted immediately after conversion, and HDR downloads are removed within 24 hours.

Can I convert multiple BMP files at once?

Yes — Convertio supports batch uploads. Queue several BMP files and convert them all to HDR format in a single session without repeating steps.

BMP to HDR Quality Rating

4.4 (105 votes)
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