High Efficiency Image Container — convert HEIC files to and from other formats.
HEIC is the format iPhones and many recent cameras use for photos. It keeps files roughly half the size of JPG at similar quality, but it is not supported by most browsers and many apps, so photos are often converted to JPG or PNG before sharing.
More HEIC conversionsYes. There is no sign-up and no watermark. To keep the service available for everyone there is a 95MB limit per file and a cap on how many files one connection can process in a short period.
Your upload is used only to make the converted file. Images are processed in memory; other files are written to a private temporary folder that is deleted as soon as the conversion finishes. Nothing is kept after the result has been sent back.
For images, a little, by design: the image is re-encoded at the Quality you choose (default 75%). Audio and video are re-encoded with high-quality settings; documents keep their text and layout as far as the target format allows. Converting never restores detail that is already missing from the original.