DDS to JP2 Converter
Convert DDS to JP2 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; JP2 is the better fit for archival masters and specialist imaging. You get a lossless JPEG 2000 (.jp2) using the reversible 5/3 wavelet. 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 JP2
- 1
Add your DDS files: drop them here, choose them, or paste from the clipboard.
- 2
There is nothing to tune: the JP2 is written losslessly. 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 .jp2 files one at a time or together as a ZIP.
Why use Aback Images for dds to jp2
Where the JP2 goes next
JP2 opens in macOS Preview, GIMP, IrfanView, XnView, ImageMagick and the OpenJPEG tools.
JP2 next to DDS
Both sides are lossless, so the size depends on how well the JP2 encoder handles this picture compared with the DDS's block compression (BC1 to BC7, also called DXT) or uncompressed RGBA.
Written without a lossy pass
The JP2 is written losslessly, 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 JP2
What changes from DDS to JP2
Encoding: the DDS uses block compression (BC1 to BC7, also called DXT) or uncompressed RGBA; JP2 uses wavelet coding: reversible 5/3 for lossless files, irreversible 9/7 for lossy ones, and the download is a lossless JPEG 2000 (.jp2) using the reversible 5/3 wavelet.
Bit depth: 8 bits per channel for common texture formats in the DDS; JP2 allows up to 16 bits per channel is common, more is possible, and the JP2 written here has 8 bits per channel.
Colour: RGB(A); normal maps and packed masks store data rather than colour in the DDS; JP2 supports sRGB, greyscale, YCC or a space described by an ICC profile, 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 JP2 keeps it as an extra component flagged as opacity.
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; JP2 can carry XML, ICC and resolution boxes, 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 JP2
JPEG 2000 is a wavelet-based format that can be truly lossless or lossy, handles very high bit depths and huge images, and is used where long-term fidelity matters: archives, medicine, satellites and digital cinema.
A .jp2 file is a box structure: a 12-byte signature box, an 'ftyp' box, a 'jp2h' header box with the size and colour specification, then the 'jp2c' box holding the codestream, which begins with FF 4F FF 51.
When converting DDS to JP2 makes sense
JP2 is the better choice for archival masters and specialist imaging, while DDS suits game textures and mods.
JP2 strengths: True lossless mode; High bit depths and very large images; Standardised for archives and digital cinema. Drawbacks to weigh: Browsers do not display it; Slow to encode and decode; Patchy support in everyday apps.
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.
- Lossless JPEG 2000 is larger than a lossy one, but usually smaller than an uncompressed TIFF of the same pixels.
- No current browser displays JP2 by default; archive and imaging software opens it.
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Frequently asked questions
Does converting DDS to JP2 lose quality?
JP2 is written losslessly, so the pixels are stored exactly as decoded. Not carried over: any mipmaps.
Is transparency kept in the JP2?
Yes. DDS stores it as alpha inside the compressed blocks (BC2, BC3, BC7) or a 1-bit cut-out (BC1), and the JP2 is written with an alpha channel, so transparent areas stay transparent.
Is the JPEG 2000 file lossless?
Yes. It is written with JPEG 2000's reversible 5/3 wavelet, so decoding it gives back exactly the pixels that went in. The trade-off is size: a lossless JP2 is larger than a lossy one, though usually smaller than an uncompressed TIFF.
Which apps open JP2 files?
MacOS Preview, GIMP, IrfanView, XnView, ImageMagick and the OpenJPEG tools. It does not open in web browsers by default.
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.