The easiest method of reformatting is photocopying the original on acid-free, alkaline buffered paper. Store the original in a clear, polyester sleeve and kept it away from light, heat, and humidity using it only when absolutely necessary. Document scanning is gaining popularity but remember that the resulting computer file will need its own backup to ensure longevity. If you scan the document make a print copy on archival paper. If the document is not brittle, check for acidity.
Acid paper loses flexibility over time but can be deacidified to halt the process.
Using a pH pen, determine if the pH is 7.0 or above. If the paper is considered alkaline, storage in an acid-free folder should be sufficient. Inks can bleed if not painstakingly checked prior to treatment. If you have any doubt, consult a conservator. A variety of products are available that make storing and handling documents very easy.