Will cropping break the multi-resolution layers inside my ICO?

When the source ICO contains multiple sizes (16x16, 32x32, 48x48, 256x256, etc.), a crop is applied to each frame at the same relative coordinates so the result is a still-valid multi-size .ico. If you only need one specific size after cropping, follow up with resize-ico to lock the output to a single dimension.

Should I crop my favicon to a perfect square?

Yes. Browsers render favicons inside a square slot, so a non-square source gets stretched or letterboxed depending on the user agent. Use the crop tool with locked equal width and height (32x32, 64x64, or 256x256 are common starting points) and add transparent padding inside the square if your glyph isn't naturally square.

What's the smallest icon size where cropping still helps?

At 16x16 the readable area is roughly an 8x8 to 12x12 inner region after antialiasing, so trimming even 2-3 pixels of source padding makes the glyph noticeably larger in the tab. Microsoft's design guidance specifically calls out exaggerating defining details at 16x16 — a tight crop is the easiest way to get there without redrawing.

Does cropping reduce ICO quality?

A pure crop (cutting away pixels outside the selection) is lossless — the kept pixels are byte-identical. Quality only changes if you also apply compression or resize the result. Leave Image Compression on the highest preset and Image Resolution on Original to preserve the source pixels exactly.

Can I crop an ICO into a non-square aspect ratio?

The .ico format itself doesn't require square frames — Microsoft has shipped non-square overlays and toolbar strips — but every consumer of the file (Windows Explorer, browsers, the desktop) expects a square. A 32x16 ICO is technically valid but will be stretched in every place it's used. Stick with square crops unless you have a very specific Windows API target in mind.

Does the cropped ICO still work as a favicon?

Yes, as long as the output is square and at least 16x16. Save the cropped file as favicon.ico in your site root and add to your — every modern browser plus legacy IE will pick it up. For sharper rendering on high-dpi screens, also export a 192x192 PNG via convert-ico-to-png and reference it with rel="icon" sizes="192x192" type="image/png".

Can I crop multiple icons in one batch?

Yes. Drop multiple .ico files at once and the same crop region (in pixel or percentage terms) applies to each. This is how you'd standardize a folder of legacy app icons, or roll a redesign across a dozen file-type icons in one pass.

My source is a PNG or JPG — can I still use this tool?

Not directly — this page accepts .ico inputs only. Convert your image to ICO first via convert-png-to-ico, convert-jpg-to-ico, or convert-svg-to-ico, then come back here to crop. If you'd rather just compress an existing .ico without changing its frame, see compress-ico.

What bit depth does the cropped ICO keep?

The output preserves whatever bit depth the source frame used — Microsoft's spec covers 1-bit, 4-bit, 8-bit (palette), and 32-bit (24-bit color + 8-bit alpha) ICO frames. A modern transparent favicon is almost always 32-bit, and the crop keeps that alpha channel intact so the cropped icon still has clean edges over any background.

Crop ICO

Crop ICO icon files online for free. Remove excess padding and trim to exact dimensions.

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