Restriction digestion is routinely performed in a buffer compatible with the restriction enzyme used. To load the samples on agarose gels for electrophoresis it is then necessary to add a loading buffer. A 10X loading buffer is often used, and consists of a dye to track the electrophoresis and a dense solution so that the digestion mixture sinks into the well. We describe a new buffer, which acts as a universal digestion buffer as well as a loading, buffer. This avoids double handling of samples, which wastes both time and consumables. Importantly, the efficiency of digestion was found not to be significantly decreased in this new buffer.