HEIC to DDS Converter
Convert HEIC to DDS in your browser. HEIC files usually come from iPhones and iPads since iOS 11, and many recent Android phones; DDS is the better fit for game textures and mods. You get an uncompressed 32-bit RGBA DDS texture with a single mip level, or DXT1 or DXT5 block compression if you choose it. Nothing is uploaded.
- Processed locally
- No upload, no wait
- No sign-up
- No watermark
Drop images here
or choose files · paste with Ctrl/⌘ V
HEIC expected · other image formats also work
How to use HEIC to DDS
- 1
Add your HEIC files: drop them here, choose them, or paste from the clipboard.
- 2
Choose the DDS compression: none for an exact 32-bit texture, DXT1 or DXT5 for smaller GPU-ready files.
- 3
Click Convert. Each file is decoded and encoded in a background thread on this device.
- 4
Download the .dds files one at a time or together as a ZIP.
Why use Aback Images for heic to dds
Where the DDS goes next
DDS opens in game engines, Visual Studio, Paint.NET, GIMP, NVIDIA and Intel texture tools.
DDS next to HEIC
The DDS is written uncompressed, so expect it to be several times larger than the HEIC, which stores lossy HEVC (H.265) intra coding, on iPhones as a grid of 512×512 tiles.
No new artefacts
HEIC is already lossy, since it stores lossy HEVC (H.265) intra coding, on iPhones as a grid of 512×512 tiles; the DDS keeps the decoded pixels uncompressed, so this step adds no compression damage of its own.
Processed on your device
Your images are decoded, edited and encoded inside this browser tab by Web Workers. Nothing is uploaded to a server.
HEIC vs DDS
What changes from HEIC to DDS
Encoding: the HEIC uses lossy HEVC (H.265) intra coding, on iPhones as a grid of 512×512 tiles; DDS uses block compression (BC1 to BC7, also called DXT) or uncompressed RGBA, and the download is an uncompressed 32-bit RGBA DDS texture with a single mip level, or DXT1 or DXT5 block compression if you choose it.
Bit depth: 8 or 10 bits per channel in the HEIC; DDS allows 8 bits per channel for common texture formats, and the DDS written here has 8 bits per channel. 10-bit HEIC photos are reduced to 8 bits per channel.
Colour: YCbCr, usually tagged Display P3 on iPhones in the HEIC; DDS supports RGB(A); normal maps and packed masks store data rather than colour, written here as 8-bit sRGB.
Transparency: the HEIC stores it as an auxiliary image item, rarely used by cameras; the DDS keeps it as alpha inside the compressed blocks (BC2, BC3, BC7) or a 1-bit cut-out (BC1).
Other images: the HEIC can hold a thumbnail, depth map, HDR gain map and burst shots as extra items; only the main image is converted.
Metadata: the HEIC can carry EXIF, XMP and an ICC profile, stored as items; DDS can carry a 128-byte header (plus a DX10 header) describing the pixel format, nothing about the picture, but nothing is copied across.
About HEIC
HEIC is the default photo format on iPhones and many Android phones. It is about half the size of JPEG, but Windows, many websites and older software cannot open it without converting.
A HEIC is a HEIF file (ISO base media boxes with the brand 'heic'). iPhone photos store the picture as a grid of 512×512 HEVC tiles that the decoder stitches together, with the thumbnail, depth map and HDR gain map as further items.
HEIC files usually come from iPhones and iPads since iOS 11, and many recent Android phones.
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.
When converting HEIC to DDS makes sense
DDS is the better choice for game textures and mods, while HEIC suits storing photos on Apple devices.
DDS strengths: Loads straight into GPU memory; Mipmaps included. Drawbacks to weigh: Not viewable outside game tools; Lossy block compression.
Limitations
- iPhone photos are usually Display P3; colours are mapped to sRGB, so very saturated reds and greens can look slightly less vivid.
- The DDS has a single mip level, so generate mipmaps in your engine or texture tool if it needs them.
- Uncompressed DDS textures take 4 bytes per pixel; DXT1 is an eighth of that and DXT5 a quarter, at the cost of lossy 4×4 block compression.
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Frequently asked questions
Does converting HEIC to DDS lose quality?
DDS is written uncompressed, so the pixels are stored exactly as decoded. Artefacts already in the HEIC stay, but nothing new is lost. 10-bit HEIC photos are reduced to 8 bits per channel. Not carried over: any a thumbnail.
Is transparency kept in the DDS?
Yes. HEIC stores it as an auxiliary image item, rarely used by cameras, and the DDS is written with an alpha channel, so transparent areas stay transparent.
Why can't I open HEIC photos on Windows or websites?
HEIC uses the HEVC codec, which is patent-encumbered and not built into most browsers, Windows apps and upload forms. Converting makes the photo open where HEIC does not, and the HEIC is decoded inside your browser to do it.
Which apps open DDS files?
Game engines, Visual Studio, Paint.NET, GIMP, NVIDIA and Intel texture tools. It does not open in web browsers.
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.