How to Convert DDS to ICO: Step-by-Step Tutorial

By Bill Crawford  ·  March 2026  ·  7 min read  ·  Last updated March 5, 2026

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What You Will Accomplish

This tutorial walks you through converting one or more DDS game texture files to ICO icon format using the free browser-based tool at Data Conversion Center. By the end you will have a multi-size ICO file — containing six embedded PNG frames at 16, 32, 48, 64, 128, and 256 pixels — ready for use as a Windows application icon or website favicon. No software installation is required. All processing runs in your browser and your files never leave your device.

This tutorial covers a single-file conversion and a batch conversion, the ZIP download option, and tips for using the output as a favicon.

Before You Start

You will need:

• One or more .dds files. Common formats — DXT1, DXT3, DXT5, BC4, BC5, BC7, uncompressed RGBA — are all supported.
• A modern web browser (Chrome, Firefox, Edge, or Safari — all work).
• That's it. No plugins, no sign-up, no payment.

If you are unsure what DDS compression format your files use, the tool detects and displays the format (DXT1, BC7, etc.) automatically when you load each file.

Step 1 — Open the Converter

Navigate to dataconversioncenter.com/image-tools/dds-to-ico/ in your browser. You will see a drop zone labelled Drop DDS files here, an options bar below it, and the Convert to ICO button (initially disabled).

Step 2 — Add Your DDS Files

There are two ways to add files:

• Drag and drop — drag one or more .dds files from your file manager directly onto the drop zone. The zone highlights blue while you hover.
• Browse — click anywhere in the drop zone (or the underlined "Browse Files" text) to open your system's file picker. Select one or multiple DDS files and confirm.

As soon as files are added, the tool reads each DDS header, detects the compression format, and generates a thumbnail preview. The Input Files section appears with a card per file showing the filename, file size, detected format (e.g. DXT5/BC3), and a status badge reading Ready.

If you drop a file that is not a valid DDS, a warning banner appears briefly and the file is skipped. The Convert button enables automatically once at least one valid DDS is loaded.

Step 3 — Choose Download Options

Above the Convert button you will find an options bar with a single checkbox: Download as ZIP.

• Unchecked (default) — each converted ICO can be downloaded individually by clicking its card's Download button after conversion, or all files can be downloaded in sequence by clicking Download All ICOs.
• Checked — after conversion the bulk download button changes to Download ZIP. Clicking it packages all ICOs into a single ZIP file named dataconversioncenter_dds_to_ico_YYYYMMDDHHMM.zip using your local timestamp.

For a single file, leave ZIP mode unchecked. For batch conversions of five or more files, the ZIP option is faster.

Step 4 — Convert

Click Convert to ICO. The button changes to Converting… and a progress bar appears. Files are processed in pairs for throughput. For each file:

1. The status badge on the input card changes from Ready to Converting… (yellow).
2. The DDS is decoded using a pure-JS BCn decompressor — no server required.
3. The decoded RGBA pixel data is scaled to six sizes (16, 32, 48, 64, 128, 256 px) using canvas 2D rendering.
4. Each scaled version is encoded as a PNG blob and assembled into a standards-compliant ICO binary.
5. The status badge turns green: Converted.

When all files are done, a summary banner shows how many succeeded and how many (if any) failed. The progress bar disappears and the bulk download bar appears.

Step 5 — Download Your ICOs

After conversion, an Output Files section appears below the summary banner. Each output card shows a thumbnail preview of the converted ICO (rendered at 200px for preview), the output filename (e.g. texture.ico), the output file size, and a ⬇ Download ICO button.

• Click ⬇ Download ICO on any card to download that file immediately.
• Click Download All ICOs in the bulk bar to trigger sequential downloads of every converted file.
• If you checked ZIP mode, click Download ZIP instead to receive a single archive.

After downloading, the tool resets automatically. To convert more files, simply drop them onto the zone again.

Using Your ICO as a Favicon

The multi-size ICO produced by this tool is ready to use as a website favicon immediately. Follow these steps:

1. Rename the downloaded file to favicon.ico.
2. Upload it to the root directory of your web server (the folder containing your index.html).
3. Optionally, add the following to your HTML <head> for explicit browser hints:

<link rel="icon" href="/favicon.ico" sizes="48x48">

Browsers will automatically choose the best embedded size — 16×16 for tab icons, 32×32 for most contexts, and 256×256 for high-DPI displays and Windows taskbar large icons.

Batch Conversion Walkthrough

If you need to convert many DDS textures at once — for example, converting a folder of game logos to ICO for a launcher — the batch workflow is the same as single-file, just with more files dropped at once:

1. Select all your DDS files in your file manager (Ctrl+A or Shift+click).
2. Drag them all onto the drop zone at once.
3. Wait for all thumbnails and format labels to appear (this can take a moment for large textures).
4. Check Download as ZIP for convenience.
5. Click Convert to ICO and wait for the progress bar to complete.
6. Click Download ZIP to receive all ICOs in one archive.

The tool processes files in parallel batches of two for efficiency. A 20-file batch typically completes in a few seconds on a modern machine.

Troubleshooting

• File skipped with a warning — the file is not a valid DDS. Check that the extension is correct and that the file has not been corrupted or renamed from a different format.
• Error badge on a card after converting — the DDS uses an unsupported format such as BC6H (HDR), cubemap, or volume texture. These are not currently supported. Use a DDS tool (e.g. texconv) to convert to a standard RGBA DDS first.
• ICO looks blurry at small sizes — the source DDS was low resolution (e.g. 64×64). For best results, use DDS textures of at least 256×256 pixels as source material.
• Icon appears stretched — the source DDS is not square. ICO frames are always square; non-square inputs are scaled to fit. Crop to square before converting.

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