Different kinds of files
An image stores pixels; an audio file stores a sound waveform. Neither contains the other, so no tool can turn a picture into a sound recording.
Looking to turn a ICO into MP3? Here's the honest answer — and the conversions that actually work.
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ICO is the Windows icon format for app icons and website favicons. It can hold several sizes in one file.
ICO is used by Windows and browsers; icon editors can open and export it.
MP3 is the universal compressed audio format, balancing small size with good quality.
MP3 plays in every media player and browser.
No. Images and audio are fundamentally different, so there's nothing to convert. You can convert your ICO to PNG or ICNS instead.
Maybe a video or slideshow with audio — use a video tool. A ICO image can't hold sound.
ICO converts cleanly to PNG or ICNS — free, no sign-up, no watermark.