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UltraISO vs Oscdimg: catalog facts
UltraISO	Oscdimg
Paid Costs $29.95 USD, with a free trial available.	Free Free to use; distributed by Microsoft as freeware.
Windows	Windows, Command line
Edits ISO images directly without extracting and rebuilding Creates bootable CD and DVD images	Supports ISO 9660, Joliet and UDF file systems Official Microsoft tool for Windows PE images
Paid license required after the trial Windows only	Windows only Command line only, with many format-specific options
Downloadable app	Downloadable app
Closed source	Closed source
License: Proprietary	License: Freeware
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.