How do I convert PNG to ICO?

Add your PNG file to the upload area above, then press Convert. The ICO file downloads straight to your device. You do not need an account, and there is no watermark.

Are my files uploaded to a server?

No. This conversion runs entirely inside your browser using WebAssembly, so the file never leaves your device — you can even disconnect from the internet after the page loads and it will still work.

Does converting to ICO reduce quality?

No. ICO is a lossless format, so the conversion preserves exactly what is in your PNG file. Note that it cannot recover detail that was already discarded when the PNG was first created — a lossless container does not undo earlier compression.

How large a file can I convert?

Up to 120 MB per file for this conversion. Because the work happens in your browser, the practical limit is your device's memory — larger files work on a desktop with plenty of RAM and may fail on an older phone.

Can I convert several files at once?

Yes. Add as many as you like and press Convert All. Each file is processed independently, so one failure does not stop the rest, and you can download everything together as a ZIP.

Can I use this on my phone?

Yes. FileTools360 works in mobile browsers on iOS and Android, including choosing files straight from your camera roll. Very large videos may run out of memory on a phone — those are better converted on a laptop.

ImageLosslessRuns in your browser

PNG to ICO Converter

Turn PNG files into ICO in a couple of clicks. Lossless image format with full alpha transparency. Multi-resolution icon container for favicons and apps. The conversion is lossless — every pixel, sample or byte in the source is preserved.

On your deviceNever uploadedGone when you close the tabHow this works

Drop your files here

PNG files (.png) · up to 120 MB each

or paste files from your clipboard

Ready when you are

Drop a PNG file above and FileTools360 will turn it into ICO — right here on your device, without uploading anything.

⌘K to search converters

How to use it

1
Add your PNG files
Drag them onto the upload area, choose them from your device, or paste them from your clipboard. You can queue several at once.
2
Adjust the settings if you want to
The defaults suit most people. Open Advanced to control dimensions, rotation and metadata removal.
3
Convert and download
Press Convert. Everything happens on your own device — nothing is uploaded. Download files one by one, or grab them all as a ZIP.

PNG and ICO explained

PNG is a lossless raster format built to replace GIF. It stores every pixel exactly as given and supports a full 8-bit alpha channel, which means genuine partial transparency rather than the single transparent colour GIF offers.

ICO is a container that holds several versions of the same icon at different sizes, so the operating system or browser can pick the one that fits. It is capped at 256×256 pixels.

Where PNG files come from: Screenshots, exported logos and UI assets, and anything designed rather than photographed.
Where ICO is used: Website favicons and Windows application icons.

PNG vs ICO

The two formats solve different problems, which is why converting between them involves trade-offs rather than a straight upgrade.

PNG compared with ICO
Property	Source	Target
Compression	Lossless	Lossy or lossless
Transparency	Yes	Yes
Animation	No	No
Introduced	1996	1985
Browser support	Universally supported.	Browsers and Windows. Sizes are capped at 256×256.

PNG is stronger at: Completely lossless — re-saving never degrades the image. Full alpha transparency, including soft edges and shadows. Sharp text and hard edges stay sharp.
ICO is stronger at: Holds multiple resolutions in one file. The format browsers expect for favicon.ico. Supports transparency.

Why convert PNG to ICO?

People make this switch when they run into the limits of PNG: you are publishing photographs on the web, where it will be several times larger than it needs to be. ICO is the better fit when you are making a favicon or a Windows application icon.

PNG limitations that prompt the switch: Much larger than JPEG or WebP for photographic content. No animation in practice (APNG exists but support is inconsistent). No native support for CMYK or print colour workflows.
What you give up: Capped at 256×256. Not a general-purpose image format.

Does converting PNG to ICO reduce quality?

Both formats store the content without discarding data, so this conversion preserves it exactly. The file size may change because the two formats compress differently, but the content itself is unaffected.

Converting a JPEG to PNG does not improve its quality. It freezes the image exactly as it already is, artefacts included, in a larger file.