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Gaia Data Release 3 provides novel flux-calibrated low-resolutionspectrophotometry for about 220 million sources in the wavelength range 330nm -1050nm (XP spectra). Synthetic photometry directly tied to a flux in physicalunits can be obtained from these spectra for any passband fully enclosed inthis wavelength range. We describe how synthetic photometry can be obtainedfrom XP spectra, illustrating the performance that can be achieved under arange of different conditions - for example passband width and wavelength range- as well as the limits and the problems affecting it. Existing top-qualityphotometry can be reproduced within a few per cent over a wide range ofmagnitudes and colour, for wide and medium bands, and with up to millimagaccuracy when synthetic photometry is standardised with respect to theseexternal sources. Some examples of potential scientific application arepresented, including the detection of multiple populations in globularclusters, the estimation of metallicity extended to the very metal-poor regime,and the classification of white dwarfs. A catalogue providing standardisedphotometry for ~220 million sources in several wide bands of widely usedphotometric systems is provided (Gaia Synthetic Photometry Catalogue; GSPC) aswell as a catalogue of $\simeq 10^5$ white dwarfs with DA/non-DA classificationobtained with a Random Forest algorithm (Gaia Synthetic Photometry Cataloguefor White Dwarfs; GSPC-WD).

Gaia Data Release 3: The Galaxy in your preferred colours. Synthetic photometry from Gaia low-resolution spectra