What is the OMF file format?
An .omf file stores an edit decision list (EDL) and optional audio/video essence in the Open Media Framework Interchange format, developed by Avid Technology in 1993 alongside a consortium including Apple, Microsoft, and SGI. OMF was the standard handoff format for transferring a picture edit from a non-linear editor (such as Avid Media Composer) into audio post-production software (such as Pro Tools) throughout the 1990s and 2000s.
Two specification versions exist. OMF1 (1993) stores clip references pointing to external media files. OMF2 (1994) is the widely deployed variant: it embeds audio essence - typically uncompressed PCM or AIFF at 44.1 kHz or 48 kHz - directly as a self-contained delivery. OMF2 files carrying embedded audio can grow very large; the FAT32-era 2 GB file size limit required splitting large sessions across multiple files.
The container is based on Apple's Bento specification (an IMA standard), with big-endian byte ordering reflecting its original Macintosh-centric design. No checksums or encryption are defined in the format.
OMF was superseded by .AAF (Advanced Authoring Format, SMPTE 2001), which removed the file-size restriction, added richer metadata support, and became an open SMPTE standard. Most modern DAWs and NLEs retain OMF import for legacy project compatibility, though new work uses AAF or direct audio interchange formats instead.
Security & safety
RISK: LOWProject/timeline data file with no executable content. Embedded audio in OMF2 is PCM/AIFF. Safe to handle in professional post-production environments.
Format details
in a nutshellPrograms that open OMF files
Windows4 apps
Avid Pro Tools
Paid File > Import Session Data > navigate to OMF; or use DigiTranslator (legacy plug-in for older Pro Tools versions). 
macOS5 apps
Apple Final Cut Pro
Paid Final Cut Pro X dropped direct OMF import; use third-party tool (X2Pro Audio Convert) to send timeline to Pro Tools. Technical details
deep spec| Specification versions | OMF1 (1993) - external media references; OMF2 (1994) - embedded essence |
| Container format | Apple Bento specification (IMA standard) |
| Encoding | Binary |
| Byte order | Big-endian (Bento container; originally Macintosh-centric) |
| Compression | None for project/EDL data; embedded audio is typically uncompressed PCM or AIFF |
| Typical file size | 1 MB - 4 GB (OMF2 with embedded audio) |
| Embedded audio sample rates | 44.1 kHz or 48 kHz (broadcast standard) |
| File size limitation | ~2 GB practical limit (FAT32 era); large sessions had to be split across multiple files |
| Primary use case | NLE-to-audio-post handoff (picture cut list with audio tracks) |
| Developer consortium | Avid Technology with Apple, Microsoft, and SGI (1993) |
| Succeeded by | AAF (Advanced Authoring Format, SMPTE 2001) - open standard with no file size limit |
| Checksum/integrity | None defined in the format specification |
| Released | 1993 |
| Latest version | OMFI 2.0 (OMF2), circa 1994 |
| Open standard | Yes · royalty-free |
| Specification | en.wikipedia.org |
OMF conversions
Community Q&A
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