ICO vs TGA
A detailed comparison of ICO Icon and TGA Image — file size, quality, compatibility, and which format to choose for your workflow.
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Technical Specifications
| Specification | .ICO | .TGA |
|---|---|---|
| MIME type | image/vnd.microsoft.icon | image/x-targa |
| Max resolutions per file | 65 535 images | — |
| Max single image size | 256×256 px | — |
| Color depths | 1, 4, 8, 24, 32 bits per pixel | — |
| Compression | Uncompressed bitmap or embedded PNG (Vista+) | None or Run-Length Encoding (RLE) |
| Extensions | — | .tga, .icb, .vda, .vst |
| Bit depths | — | 8, 16, 24, 32 bits per pixel |
| Byte order | — | Little-endian |
Strengths Comparison
.ICO Strengths
- Multi-resolution: one file, many sizes, OS picks the right one.
- Universal favicon support in every browser since IE5.
- Supports transparency (1-bit since 1985, full alpha since XP).
- Tiny file size — an entire favicon pack typically fits in under 15 KB.
- No licensing or patent concerns — fully in the public domain spec-wise.
.TGA Strengths
- Extremely simple — trivially easy to read and write.
- Lossless with optional RLE compression.
- Supports 8, 16, 24, and 32-bit color with alpha channel.
- Universal in legacy game development and 3D rendering pipelines.
Limitations
.ICO — Limitations
- Cannot compress continuous-tone images efficiently — use PNG or WebP for photos.
- Format is essentially frozen in 1999 — no HDR, no wide gamut, no modern features.
- Maximum image dimension is 256×256 px (inside an ICO container).
- Editing requires specialized tools — most image editors treat it as a curiosity.
.TGA — Limitations
- No metadata, no color profile, no gamma correction.
- Aging — PNG and EXR cover its use cases with better compression.
- Bottom-up pixel order trips up newcomer parsers.
- Not a web format — browsers don't display TGA natively.
Frequently Asked Questions
ICO (Icon) is Microsoft's 1985 multi-resolution icon format, originally shipped with Windows 1.0. A single .ico file holds multiple sizes (16×16, 32×32, 48×48, 256×256) so the OS can pick the best one for the current display context. Since 1999, every website uses a favicon.ico to show its icon in browser tabs.
On Windows, ICO files open natively in File Explorer and Photos. On macOS, Preview handles basic display. For editing, use GIMP (free), Photoshop with a plugin, or dedicated icon editors like IcoFX.
Use the PNG-to-ICO converter on KaijuConverter — upload a PNG (ideally square, at least 256×256) and download a multi-resolution ICO with all standard favicon sizes embedded.
A complete favicon pack includes 16×16, 32×32, 48×48, and 256×256 px variants all in one ICO file. The total file size is typically 5-15 KB. Browsers automatically pick the right size for tabs, bookmarks, and desktop shortcuts.
ICO for /favicon.ico (every browser requests this URL automatically). PNG for everywhere else — social media profile images, in-page icons, app logos. Modern favicon best practice includes both an .ico at the root and multiple .png sizes referenced via <link> tags in HTML.
Yes. Every browser still requests /favicon.ico on every domain as its first icon fallback. Modern sites typically provide both favicon.ico and higher-quality SVG or PNG icons via <link rel="icon"> tags — browsers pick the best match.
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