Is my ICO file uploaded to a server?

No. The entire conversion happens in your browser using JavaScript and the Canvas API. Your file never leaves your device.

Is the output a real TIFF file?

Yes. UTIF.js encodes the decoded icon pixels into a genuine single-page TIFF binary with the image/tiff MIME type.

Which frame of the ICO is used?

The tool picks the largest frame available in the ICO by drawing the image element at its natural width and height. Multi-resolution ICOs typically include sizes from 16x16 up to 256x256; the 256x256 frame is used when present.

What ICO file sizes are supported?

Standard ICO files up to several megabytes are supported. Very large files (over 10 MB) may be slower to process depending on your device.

Can I convert multiple ICO files at once?

Currently the tool converts one file at a time. Re-upload a new file to convert another icon.

ICO to TIFF Converter

Upload an ICO file and download its browser-decoded frame as a genuine TIFF — no server upload, fully client-side.

Upload ICO File

Drop an ICO file here, or click to browse .ico files only

The decoded icon frame is encoded locally as a genuine single-page TIFF using UTIF.js.

Preview

Upload an ICO file to see the preview here

Summary

Upload an ICO file and download its browser-decoded frame as a genuine TIFF — no server upload, fully client-side.

How it works

Click "Choose ICO File" and select any .ico file from your device.
The tool reads the file using the FileReader API — nothing is uploaded to a server.
The ICO is drawn onto an HTML5 Canvas element at its natural size.
UTIF.js encodes the Canvas RGBA pixels into a genuine TIFF binary.
Click "Download TIFF" to save the converted file to your device.

Use cases

Quickly extract an icon frame for use in design tools that accept TIFF files.
Convert a favicon or app icon to a higher-quality image format for documentation.
Preview what the largest frame of a multi-resolution ICO looks like.
Prepare icon assets for workflows that require a .tiff filename.
Extract an ICO frame into a genuine single-page TIFF without installing desktop software.
Verify the pixel content of an ICO file before publishing.

Frequently Asked Questions

Last updated: 2026-09-22 · Reviewed by Nham Vu