For records that must last years or decades, the file format is one of the biggest determinants of whether they’ll still be usable. The Library of Congress maintains widely used guidance — including a Sustainability of Digital Formats resource and a Recommended Formats Statement — on what makes a format suitable for the long haul.
What makes a format preservation-friendly
- Open and well-documented — open specifications outlast proprietary, undocumented formats whose vendors may vanish.
- Widely adopted — broad support makes a format more likely to remain readable and to have migration tools.
- Stable — formats that don’t change frequently are safer bets.
- Self-documenting — formats that carry technical metadata about themselves.
- Lossless / uncompressed (for masters) — avoid lossy compression and, ideally, encryption for preservation copies.
Commonly chosen formats
By content type, typical preservation choices include:
- Text/documents: PDF/A (an ISO-standardized archival PDF), plain text, or office formats in open standards.
- Still images: TIFF (uncompressed) as a master; JPEG/JPEG 2000 for access copies.
- Audio: open, lossless formats (e.g., WAV/BWF) for masters.
- Video: standardized, well-supported codecs/containers, which evolve over time.
- Data/datasets: open, documented formats like CSV over proprietary binaries.
These are general guides, not absolutes — always check current guidance, since format recommendations evolve.
Format isn’t the whole answer
Choosing a sustainable format is necessary but not sufficient. Long-term usability also requires migration as formats age, fixity checks to catch corruption, rich preservation metadata, and redundant storage — the full digital preservation toolkit.
The takeaway
Favor open, stable, well-supported, lossless formats for preservation masters; use lighter formats for access copies; and revisit choices over time. The format you pick today is a bet on what will still be readable decades from now — make it a safe one. See the vital records, archives and preservation hub for more.
Sources & further reading
Authoritative government and non-profit references.
- Sustainability of Digital Formats — Library of Congress
- Recommended Formats Statement — Library of Congress
How to cite this page
APA
RM University Editorial Team. (2026). File Formats for Long-Term Preservation. Records Management University. https://www.recordsmgmt.org/articles/file-formats-for-long-term-preservation/
MLA
RM University Editorial Team. "File Formats for Long-Term Preservation." Records Management University, 16 June 2026, www.recordsmgmt.org/articles/file-formats-for-long-term-preservation/.