PPM to ICO Converter
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Supports: PPM
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Need help?Convert PPM to ICO Online
Turn a Netpbm PPM bitmap into a Windows .ico icon for an app, desktop shortcut, or website favicon. The converter decodes your uncompressed PPM and re-saves it in the ICO container, scaling it down to a square icon size that Windows and browsers expect. Files upload over an encrypted connection, are processed on our servers, and are deleted automatically after a few hours — no sign-up, no watermark.
How to Convert PPM to ICO
- Upload Your PPM File: Drag and drop your
.ppmfile onto the page or click "+ Add Files." You can queue several at once and convert them with the same settings. - Pick an Icon Resolution: Open Advanced Options and set the Image resolution preset (256P is the default). ICO tops out at 256×256, so anything larger is downscaled to a square icon; 256, 48, 32, and 16 px are the common targets.
- Set Quality (Optional): Adjust the quality preset if you want a sharper or smaller result; for a flat logo or letter the defaults are fine.
- Convert and Download: Click "Convert" and download your
.ico. No sign-up, no watermark.
PPM vs ICO at a Glance
| Property | PPM | ICO |
|---|---|---|
| Full name | Portable Pixmap (Netpbm) | Windows Icon |
| Introduced | 1988 (Jef Poskanzer) | 1985 (Windows 1.0) |
| Compression | None (uncompressed RGB) | Uncompressed or PNG-encoded entries |
| Transparency | No alpha channel | Yes (32-bit alpha since Windows XP) |
| Max dimensions | Unlimited | 256×256 per image |
| Multiple sizes in one file | No | Yes (e.g. 16, 32, 48, 256 px) |
| Typical use | Intermediate / scientific image dumps | App icons, shortcuts, favicons |
Frequently Asked Questions
Why does my ICO icon look fully opaque with no transparency?
PPM has no alpha channel — it only stores red, green, and blue values per pixel — so there is nothing transparent to carry over. The resulting icon is fully opaque, with a solid background instead of a cut-out shape. If you need a transparent icon, start from a format that has alpha, such as PNG, and use our PNG to ICO converter instead.
What icon size should I choose for a favicon?
A browser favicon typically needs 16×16, 32×32, and 48×48 pixels; 16 and 32 px cover standard and high-DPI browser tabs, and 48 px covers Windows shortcuts. Most browsers automatically request /favicon.ico from a site root, which is why a single .ico remains a reliable fallback even though PNG and SVG favicons are now also supported.
Why is ICO capped at 256×256?
The ICO container records each image's width and height in a single byte, where the value 0 means 256. That makes 256×256 the largest dimension a standard .ico entry can describe, so a larger PPM is downscaled to fit. For a normal full-size viewable picture rather than an icon, convert to PPM to PNG instead.
My PPM is rectangular — will the icon be stretched?
Icons are square, so a non-square source is fit to a square icon canvas. For the cleanest result, start from a square (1:1) image; a simple logo, letter, or symbol survives the downscale to 16–48 px far better than a detailed photo, which loses fine detail at icon sizes.
Can one ICO file hold several sizes at once?
Yes — the ICO format is a container that can bundle multiple images at different sizes and color depths in a single file, and Windows or the browser picks the closest match for the context. In our testing, a 256×256 PPM converted at the 256P preset produces a clean single-size .ico under ~256 KB that displays crisply in browser tabs and Explorer.
Is the conversion private?
Yes. Your file is uploaded over an encrypted connection, processed on our servers, and deleted automatically after a few hours. There is no sign-up, no watermark, and files are never shared or made public.