PNG to ICO Converter
Convert PNG files (released 1996, Lossless) to ICO (Container — holds PNG or BMP frames, typically Small — typically <100 KB per file). Runs in your browser — no upload, no signup.
Based on 12,431+ conversions delivered
Should you convert PNG to ICO? It depends on where the file is headed. ICO (Container — holds PNG or BMP frames, typically Small — typically <100 KB per file) is the right call when you need Favicons, Windows desktop icons, executable icons and your destination supports it — Universal — every browser fetches /favicon.ico. PNG stays the better master when you need Screenshots, icons, logos, any image with transparency. In our sample set, ICO files ran about 213% larger than the PNG source. This converter runs the whole job locally in your browser, so a 50-file batch is as private as a single image and nothing is uploaded. Below: a side-by-side of both formats, the real trade-offs, and the edge cases — transparency, animation, colour depth — that decide whether PNG → ICO is a clean win.
Looking to programmatically convert PNG to ICO?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted output back — no browser, no UI, no rate limits on paid tiers.
Sub-second response on common pairs
Webhook delivery for batch jobs
100+ format pairs supported
PNG vs ICO — side-by-side
The numbers and capabilities at a glance, so you know what you're trading.
PNG
- Year released
- 1996
- Compression
- Lossless
- Transparency
- Yes (full alpha)
- Animation
- No (use APNG / GIF / WebP)
- Browser support
- Universal (every browser since the 90s)
- Best for
- Screenshots, icons, logos, any image with transparency
ICO
- Year released
- 1985 (Microsoft)
- Compression
- Container — holds PNG or BMP frames
- Transparency
- Yes
- Animation
- No
- Browser support
- Universal — every browser fetches /favicon.ico
- Best for
- Favicons, Windows desktop icons, executable icons
Real PNG → ICO file sizes
We ran a fixed set of sample images through this exact converter so you can see the typical size impact before converting your own files.
| Sample image | PNG size | ICO size | Change |
|---|---|---|---|
| Photo | 174.4 KB | 264.1 KB | +51% larger |
| Screenshot / UI | 488 B | 40.1 KB | +8319% larger |
| Logo / transparency | 6.8 KB | 264.1 KB | +3792% larger |
Measured on a 256×256 sample set with this converter on 2026-05-28. Real-world files vary with resolution, colour and content.
Heads up before converting PNG → ICO
What changes — and what your conversion will cost — based on how PNG and ICO differ.
Embedded color profile gets dropped
PNG can carry an embedded ICC color profile; ICO doesn't preserve one. Colour-managed pipelines (proofing, brand-accurate print, wide-gamut displays) interpret the missing profile as sRGB, which shifts hues on anything captured in Display P3 or Adobe RGB. If the colour math matters, convert the image to sRGB explicitly before exporting to ICO.
Best practices for PNG → ICO
Concrete settings to pick before you convert PNG to ICO.
- Always preview the ICO output before bulk-downloading — colour shifts, transparency surprises, and quality artifacts show up in the preview before they ship.
- Strip EXIF metadata if file size or privacy matters — camera GPS coordinates, timestamps, and serial numbers travel inside the image bytes by default.
- ICO is lossless, so quality settings don't apply — but you can still shave bytes by quantising the palette (pngquant for PNG, gif2webp for GIF) when the image has a limited colour count.
- Verify the alpha channel rendered as expected — premultiplied vs straight alpha and edge halos around antialiased pixels are the most common surprises when going to ICO.
- For web ICO delivery, encode in sRGB — wider colour spaces (Display P3, ProPhoto) render unpredictably across browsers and email clients.
- Converting to ICO silently drops EXIF/XMP metadata embedded in the source. That's a privacy win if the file is being shared, but a loss if you rely on capture date, GPS, or camera settings — copy what you need to a sidecar before converting.
- Re-encoding a PNG (lossless) source into another lossless format like ICO preserves every pixel, but the file size can swing in either direction with no gain in quality. If the goal is smaller files, pick a lossy target (JPEG, WebP, AVIF); if it's pixel fidelity for archival, keep the PNG original.
When NOT to convert PNG → ICO
Honest cases where this conversion is the wrong call — pick a different format or keep your PNG source.
Skip if the file is bound for print
ICO is a delivery-grade web format. Print pipelines (offset, large-format, packaging) expect TIFF, PDF, or high-bit-depth PNG with embedded ICC profiles and a CMYK option. Converting PNG to ICO for a print job will likely fail prepress checks — keep the original or convert to a print-friendly format instead.
The importance of a good image conversion
Why getting PNG → ICO right matters more than you think.
Frequently asked
The basics everyone asks before dropping a file.
Convert PNG to other formats
Convert other formats to ICO