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

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

Connect on LinkedIn →

What This Tutorial Covers

This tutorial walks you through converting ICO icon files to lossless TIFF 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 use the output TIFF in professional workflows.

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

What You Need

• One or more .ico files — application icons, favicon.ico files, or icon library assets
• A modern browser: Chrome, Edge, Firefox, or Safari (2022 or later)
• No account, no software, no subscription

Step 1: Open the Converter

Navigate to dataconversioncenter.com/image-tools/ico-to-tiff/. The page loads UTIF (the TIFF encoding library) and JSZip from CDN — no install needed. All conversion runs in your browser's JavaScript environment.

Step 2: Add Your ICO Files

You have two ways to add files:

• Drag and drop: Open your file manager and drag one or more .ico files directly onto the drop zone labeled "Drop ICO 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 soon as files are added, the tool generates thumbnail previews for each one using your browser's native ICO decoder. You will see an Input Files grid with a card per file showing the filename, file size, and a Ready status badge.

Note: Files with an extension other than .ico are automatically rejected with an inline error message and are not added to the conversion queue.

Step 3: Choose Download Mode

Before converting, decide how you want to download your TIFF files:

• Individual downloads (default): Leave "Download as ZIP" unchecked. After conversion, each output card has its own Download button, and a "Download All TIFFs" button appears for sequential bulk download.
• ZIP archive: Check "Download as ZIP". After conversion, a single "Download ZIP" button downloads all TIFFs in one file named dataconversioncenter_ico_to_tiff_YYYYMMDDHHMM.zip using your local date and time.

For batches of more than 5 files, the ZIP option is recommended to avoid multiple browser download dialogs.

Step 4: Click "Convert to TIFF"

Click the blue Convert to TIFF button. The button label changes to "Converting…" and is disabled while conversion runs.

For each file in sequence:

1. The status badge on the input card changes from Ready to Converting…
2. The browser's native ICO decoder renders the file to a canvas element, automatically selecting the highest-resolution embedded frame.
3. The Canvas API reads the full RGBA pixel data from the canvas using getImageData().
4. UTIF encodes the RGBA data as a standards-compliant, uncompressed TIFF binary in memory.
5. The status changes to Converted and an output card appears in the Output Files grid.

Files are processed in batches of two for throughput efficiency. The progress bar tracks overall progress — "Converted X of N".

Step 5: Review the Results

After conversion completes, a summary banner appears: "✓ All N files converted successfully" or "Completed: X succeeded, Y failed."

The Output Files grid displays cards for each successfully converted TIFF, showing:

• A thumbnail preview of the converted image
• The output filename — same base name as the input with .tiff extension (e.g. favicon.ico → favicon.tiff)
• Output file size (typically 200–300 KB for a 256×256 RGBA TIFF)
• A per-file Download TIFF button

Any files that failed are marked with a red Error badge. Common causes: the file is not a valid ICO (e.g. a renamed PNG or JPG), or the browser could not decode the embedded frames. The tool continues converting remaining files when one fails.

Step 6: Download Your TIFFs

Individual download

Click the ⬇ Download TIFF button on any output card to save that file immediately. The filename is the same as the input with .tiff extension.

Download All (no ZIP)

With "Download as ZIP" unchecked, click Download All TIFFs. The tool triggers sequential browser downloads with a 120 ms delay between each to prevent browser throttling.

Download ZIP

With "Download as ZIP" checked, click Download ZIP. JSZip assembles all TIFF blobs in memory and downloads a single archive named, for example, dataconversioncenter_ico_to_tiff_202603061409.zip.

Step 7: The Tool Resets Automatically

After a ZIP download or "Download All" completes, the tool automatically resets to its initial empty state. All thumbnails, cards, and file references are cleared from browser memory. Click Start Over to reset manually at any point before download completes.

Using the TIFF Output in Professional Tools

Adobe Photoshop

Open the TIFF directly using File → Open. Photoshop recognizes the 32-bit RGBA encoding and presents the file with a transparent background automatically. You can then edit layers, adjust colors, or upscale using Preserve Details 2.0 for print use.

GIMP

File → Open and select the TIFF. GIMP loads it as an RGBA image. The alpha channel appears as a separate channel in the Channels panel. All GIMP editing tools, filters, and export options are available.

Affinity Photo

Drag the TIFF directly into Affinity Photo or use File → Open. The file loads at full resolution with transparency preserved. Affinity's non-destructive editing pipeline works seamlessly with TIFF as a source format.

Design Asset Management (DAM)

Most DAM systems (Bynder, Brandfolder, Adobe DAM) accept TIFF natively. Upload the converted TIFFs directly to your asset library. TIFF's lossless encoding ensures the master asset remains identical across all future exports.

Troubleshooting

• File shows Error status: Verify the file is a genuine ICO. Some files with .ico extensions are actually renamed PNG or BMP files. Try opening in GIMP or Windows Photos to confirm. Genuine ICO files open without issues.
• Thumbnail not generating: Some very old ICO files use 1-bit or 4-bit color depth frames that some browsers cannot render. The tool will attempt conversion but the thumbnail preview may fail. If the thumbnail fails but conversion succeeds, the TIFF output is still valid.
• TIFF appears large in file size: Uncompressed RGBA TIFF at 256×256 is approximately 256 KB. This is expected. If you need smaller file sizes, open the TIFF in GIMP or Photoshop and re-save with LZW or ZIP compression, which reduces size by 40–60% with no quality loss.
• ZIP not downloading: Ensure you clicked the Download ZIP button directly as a user action. Some browsers may block programmatically triggered downloads without a direct click event.
• Only seeing a very small image after opening TIFF: ICO files are small by design — 256×256 is the maximum standard size. The TIFF will be exactly the size of the largest ICO frame. This is not an error.

Next Steps After Conversion

• Archive to your DAM: Upload the TIFFs to your digital asset management system as master copies.
• Edit in Photoshop or GIMP: Use the TIFF as an editable source for retouching or extending the icon artwork.
• Upscale for print: Use Photoshop's Preserve Details 2.0 or Topaz Gigapixel AI to enlarge the TIFF for large-format print use.
• Convert to other formats: From the TIFF, you can export to any format your workflow requires — PNG for web use, JPEG for print proofing, PDF for document embedding.

Related Tools