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

By Bill Crawford  ·  March 2026  ·  6 min read  ·  Last updated March 6, 2026

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What This Tutorial Covers

This tutorial walks you through converting TIFF images to ICO format using the browser-based tool on this site. No software installation required. You will learn how to add files, understand the per-file status system, use batch ZIP download, and deploy your ICO as a favicon.

For background on why you might want ICO and when to use it, see the companion TIFF to ICO Complete Guide.

What You Need

• One or more .tiff or .tif files (logos, scanned artwork, print assets, or archival images)
• Any modern browser: Chrome, Firefox, Edge, or Safari all work — TIFF decoding is handled entirely in JavaScript
• No account, no software, no subscription

Step 1: Open the Converter

Navigate to dataconversioncenter.com/image-tools/tiff-to-ico/. The page loads the JSZip library from CDN — no install needed. The TIFF decoder uses your browser's native image handling, and the ICO encoder is written in pure JavaScript. Everything runs locally in your browser.

Step 2: Add Your TIFF Files

You have two ways to add files:

• Drag and drop: Open your file manager and drag one or more .tiff or .tif files directly onto the drop zone labeled "Drop TIFF files here". The zone highlights in blue when you hover over it.
• Browse: Click anywhere on the drop zone (or the "Browse Files" link) to open your file picker. Select multiple files using Ctrl+click (Windows) or Cmd+click (Mac).

As files are added, the tool attempts to generate thumbnail previews. Large TIFF files may take a moment to decode for the thumbnail — this is normal and does not affect the conversion.

Each file that loads successfully will show a status badge of Ready. The Convert to ICO button activates once at least one file is loaded.

Step 3: Choose Your Download Mode

Before converting, decide how you want to receive your ICO files:

• Individual download (default): Leave the "Download as ZIP" checkbox unchecked. After conversion, each output card shows its own "⬇ Download ICO" button, and a "Download All ICOs" button appears below the output grid.
• ZIP download: Check "Download as ZIP". After conversion completes, a "Download ZIP" button appears. Clicking it packages all converted ICOs into a single .zip file named with a timestamp (e.g., dataconversioncenter_tiff_to_ico_202603061200.zip).

You can change this setting before or after conversion — the checkbox only affects what happens when you click the bulk download button.

Step 4: Click Convert to ICO

Click the blue Convert to ICO button. The tool processes files in pairs for efficiency. For each file:

1. The browser decodes the TIFF into pixel data using native APIs.
2. The ICO encoder creates a canvas at each of the six icon sizes: 16×16, 32×32, 48×48, 64×64, 128×128, and 256×256 pixels.
3. Each sized canvas is encoded as a PNG blob.
4. The encoder assembles all six PNG blobs into a single standards-compliant ICO binary in memory.

A progress bar at the top of the tool area tracks how many files have been processed. Each input card updates its status badge from Ready to Converting… and then to Converted (green) or Error (red).

Step 5: Review and Download

Once conversion completes, a summary banner appears confirming how many files succeeded. An output grid shows cards for each successfully converted ICO, including:

• A thumbnail preview (the 200px scaled version of the original image)
• The output filename (same as input, but with .ico extension)
• The output file size
• A green "Converted" badge
• A "⬇ Download ICO" button for that specific file

Download files as needed. After downloading, clicking "Start Over" resets the tool completely — clearing all input and output data from memory.

Batch Converting Multiple TIFF Files

The tool handles batch conversion efficiently. There is no hard cap on file count — you can drop dozens of TIFF files at once. Files are processed two at a time to balance speed and memory usage. For large files or many files:

• Use ZIP download mode to collect all outputs at once without clicking each individual file.
• Keep the browser tab in focus during conversion to prevent browsers from throttling background JavaScript execution.
• For extremely large TIFF files (50+ MB), expect a few seconds of processing per file for the thumbnail and conversion stages.

Deploying Your ICO as a Favicon

After downloading your ICO file, follow these steps to use it as a website favicon:

1. Rename the file to favicon.ico (unless it already has that name).
2. Upload to your website's root directory — the same directory containing your homepage's index.html.
3. Add <link rel="icon" href="/favicon.ico" sizes="48x48"> to the <head> of your HTML.
4. Clear your browser cache (or use incognito mode) to verify the new favicon appears in the browser tab.

The multi-size ICO format ensures the correct resolution is shown in every context — small in browser tabs, larger when pinned to the Windows taskbar.

Troubleshooting

• File shows an Error badge: The TIFF file may use a compression or color mode the browser cannot decode (e.g., JPEG-in-TIFF, CMYK). Try opening the file in an image editor and re-exporting as a standard RGB TIFF, then retry.
• No thumbnail appears: This is a non-fatal issue — the thumbnail generation is separate from the conversion. Click Convert to ICO anyway; the ICO may still be produced successfully.
• File shows an error badge: The TIFF may use an unusual compression (JPEG-in-TIFF, JBIG, etc.). Try re-exporting from your original software as uncompressed or LZW TIFF.
• ICO looks blurry at 16×16: This is a source image issue, not a tool issue. High-detail TIFFs will always lose detail at very small sizes. Simplify your source image to a bold, high-contrast mark for best icon results.