What is PNG?
PNG is a lossless raster format built for graphics rather than photographs. Pixels come back out exactly as they went in, and an alpha channel stores per-pixel transparency.
Created in 1996 as a patent-free replacement for GIF.
- Perfectly lossless — logos, screenshots and UI mockups stay crisp
- Full 8-bit alpha transparency for overlays and layered artwork
- Universally supported and safe to re-save as many times as you like
What is ICO?
ICO is the Windows icon container. A single file bundles several square sizes so the operating system or browser can pick the one it needs.
Introduced with Windows 1.0 in 1985 and still used for favicons.
- Holds multiple resolutions (16, 32, 48, 256 px) in one file
- The historic default for browser favicons
- Supports transparency
Why convert PNG to ICO?
- ICO is the better fit for favicons and Windows application icons, while PNG is built for screenshots, logos, icons and anything that needs transparency or razor-sharp edges.
- It sidesteps the main drawback of PNG: photographs are typically two to five times larger than the JPEG equivalent.
- You gain holds multiple resolutions (16, 32, 48, 256 px) in one file.
- Compatibility improves where it counts: Windows shell and executables and All browsers, for favicon.ico.
Quality and file size after conversion
Both formats are lossless, so nothing is thrown away. The output is a byte-faithful representation of the input; only the container and the compression scheme change, which is why sizes differ while the content does not.
Processed on our conversion backend, then deleted immediately.
Compatibility
PNG opens in Every web browser and operating system, All design tools, office suites and presentation software, Print workflows that accept RGB artwork. ICO opens in Windows shell and executables, All browsers, for favicon.ico.
If the file has to work for someone else, choose the format their software already understands rather than the one with the best specification.
Limitations to know about
- Square, small images only
- Not a general-purpose image format
When to keep PNG instead
PNG is still the right choice for screenshots, logos, icons and anything that needs transparency or razor-sharp edges. Keep the original alongside the converted copy whenever you might need to re-export at a different size or quality — conversion is quick, but recovering discarded detail is impossible.
How to convert PNG to ICO
- 1
Drag your PNG file onto the drop zone above, or click to browse. Up to 20 files can be queued at once.
- 2
ICO is already selected as the output format — change it in the dropdown if you need something else.
- 3
Press Convert and watch the per-file progress bar.
- 4
Download the ICO result, or grab everything as a single ZIP when you converted a batch.
Frequently asked questions
Is this PNG to ICO converter free?
- Yes. Every conversion on Convert Always is free, with no account, no watermark and no daily download cap. The site is funded by advertising rather than subscriptions.
Are my PNG files uploaded to a server?
- PNG to ICO is one of the few pairs that needs server-side processing. The file is sent over an encrypted connection, converted, returned to you and deleted immediately — it is never stored or shared.
Will converting to ICO reduce the quality?
- Both formats are lossless, so nothing is thrown away. The output is a byte-faithful representation of the input; only the container and the compression scheme change, which is why sizes differ while the content does not.
Can I convert several PNG files at once?
- Yes. Add up to 20 files to the queue, convert them in one pass and download the results individually or bundled into a single ZIP archive.
What is the maximum PNG file size?
- Files up to 100 MB each are accepted. Browser-side conversions are limited mainly by your device's memory, so very large video files convert faster on a desktop than on a phone.
Does it work on mobile?
- Yes. The converter is built mobile-first and works in Safari and Chrome on phones and tablets. Heavy media conversions are slower on mobile hardware but still run locally.
Related conversions
See every images conversion we support.
Your recent conversions
Stored in this browser only, never on our servers.
No conversions yet
Your conversion history is stored privately in this browser — never on a server.