ITHMB is legacy and read-only here
ITHMB is an older raster format. It can usually be opened and converted from, but it's long obsolete, so there's no modern encoder to create new ITHMB files.
Looking to convert PNG to ITHMB? Here's the honest answer — and what works instead.
Turn your file into a share-worthy AI Effect — one tap, no prompts.
PNG is a lossless raster format with full transparency. It keeps every pixel intact, making it ideal for logos, icons, screenshots and graphics with sharp edges.
PNG opens in every browser and image viewer, plus Photoshop, GIMP, Preview and Photos.
Not here — ITHMB is a legacy format with no modern encoder. We can often read ITHMB as a source, but for output use a current format like JPG, TIFF or WEBP.
PNG converts to JPG, TIFF or WEBP — free, no sign-up, no watermark.