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 PDF to ITHMB? Here's the honest answer — and what works instead.
Turn your file into a share-worthy AI Effect — one tap, no prompts.
PDF is the universal document format that preserves layout on every device — images are often converted to PDF for sharing and printing.
PDF opens in every browser and PDF reader.
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 TIFF or PNG.
PDF converts to TIFF or PNG — free, no sign-up, no watermark.