DDS to BMP Converter
Convert DDS to BMP in your browser. DDS files usually come from DirectX games, game mods and texture tools such as NVIDIA Texture Tools and Intel's texture plugin; BMP is the better fit for legacy software and embedded systems that require it. You get an uncompressed 24-bit BMP, or 32-bit with alpha when the image has transparency. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
DDS expected · other image formats also work
How to use DDS to BMP
- 1
Add your DDS files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the BMP is written uncompressed. Resizing and rotating are under More options if you need them.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .bmp files one at a time or together as a ZIP.
Why use Aback Images for dds to bmp
Where the BMP goes next
BMP opens in every operating system and browser.
BMP next to DDS
Neither format compresses much, so the BMP lands close to the DDS in size.
Written without a lossy pass
The BMP is written uncompressed, so the pixels decoded from the DDS arrive unchanged.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
DDS vs BMP
What changes from DDS to BMP
Encoding: the DDS uses block compression (BC1 to BC7, also called DXT) or uncompressed RGBA; BMP uses usually none; RLE for some 4 and 8-bit files, and the download is an uncompressed 24-bit BMP, or 32-bit with alpha when the image has transparency.
Bit depth: 8 bits per channel for common texture formats in the DDS; BMP allows 1, 4, 8, 16, 24 or 32 bits per pixel, and the BMP written here has 24 or 32 bits per pixel.
Colour: RGB(A); normal maps and packed masks store data rather than colour in the DDS; BMP supports RGB or an indexed palette, written here as 8-bit sRGB.
Transparency: the DDS stores it as alpha inside the compressed blocks (BC2, BC3, BC7) or a 1-bit cut-out (BC1); the BMP keeps it as an optional fourth byte in 32-bit files, which many programs ignore.
Other images: the DDS can hold mipmaps, cubemap faces or texture arrays; only the main image is converted.
Metadata: the DDS can carry a 128-byte header (plus a DX10 header) describing the pixel format, nothing about the picture; BMP can carry nothing beyond the header's resolution fields (and a colour profile in rare V5 headers), but nothing is copied across.
About DDS
DDS is a GPU texture format used by DirectX games. It stores block-compressed textures (DXT/BC) and mipmaps that graphics cards decode directly.
A DDS file starts with 'DDS ' and a 124-byte header giving the size, mipmap count and pixel format: a FourCC such as DXT1 or DXT5, or 'DX10' followed by an extra header naming a DXGI format. The largest mipmap comes first.
DDS files usually come from DirectX games, game mods and texture tools such as NVIDIA Texture Tools and Intel's texture plugin.
About BMP
BMP stores raw, uncompressed pixels. Files are huge but trivially simple, which is why some legacy Windows software, embedded displays and printers still ask for it.
A BMP is a 14-byte file header ('BM' and the offset to the pixels), a DIB header (40 bytes, or 108 and 124 bytes in the V4 and V5 versions that add colour masks and alpha), an optional palette, then pixel rows padded to 4 bytes and normally stored bottom-up.
When converting DDS to BMP makes sense
BMP is the better choice for legacy software and embedded systems that require it, while DDS suits game textures and mods.
BMP strengths: No compression artifacts; Read by very old and very simple software. Drawbacks to weigh: Enormous files; Poor support for transparency; No metadata.
Limitations
- Only the top-level image (the largest mipmap of the first surface) is converted; smaller mipmaps and other cubemap faces are left out.
- Normal maps and packed masks hold data rather than colours, so they look purple or odd as ordinary pictures.
- A BMP is uncompressed, about 3 bytes per pixel, or 4 with transparency, so expect a large file.
- Some older programs ignore the alpha channel of a 32-bit BMP and show transparent areas as black or white.
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Frequently asked questions
Does converting DDS to BMP lose quality?
BMP is written uncompressed, so the pixels are stored exactly as decoded. Not carried over: any mipmaps.
Is transparency kept in the BMP?
Yes. DDS stores it as alpha inside the compressed blocks (BC2, BC3, BC7) or a 1-bit cut-out (BC1), and the BMP is written with an alpha channel, so transparent areas stay transparent.
Which apps open BMP files?
Every operating system and browser.
Are my images uploaded anywhere?
No. Processing happens inside your browser with WebAssembly and Web Workers. The site only downloads the app code and codecs; your files never leave your device. You can confirm this with the live upload counter on the tool, or in your browser's network panel.
Can I process many files at once?
Yes. Drop a whole selection or folder. Files are processed in parallel on several worker threads, each result can be downloaded on its own, and everything can be saved as one ZIP.
Is it free? Is there a file limit or watermark?
It is free with no account, no watermark and no daily limit. The only limit is your device's memory: very large images (over roughly 100 megapixels) may be refused to keep the tab from crashing.