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We present the photometric calibration of the twelve optical passbandsobserved by the Javalambre Photometric Local Universe Survey (J-PLUS). Theproposed calibration method has four steps: (i) definition of a high-qualityset of calibration stars using Gaia information and available 3D dust maps;(ii) anchoring of the J-PLUS gri passbands to the Pan-STARRS photometricsolution, accounting for the variation of the calibration with the position ofthe sources on the CCD; (iii) homogenization of the photometry in the othernine J-PLUS filters using the dust de-reddened instrumental stellar locus in (X- r) versus (g - i) colours, where X is the filter to calibrate. The zero pointvariation along the CCD in these filters was estimated with the distance to thestellar locus. Finally, (iv) the absolute colour calibration was obtained withthe white dwarf locus. We performed a joint Bayesian modelling of eleven J-PLUScolour-colour diagrams using the theoretical white dwarf locus as reference.This provides the needed offsets to transform instrumental magnitudes tocalibrated magnitudes outside the atmosphere. The uncertainty of the J-PLUSphotometric calibration, estimated from duplicated objects observed in adjacentpointings and accounting for the absolute colour and flux calibration errors,are ~19 mmag in u, J0378 and J0395, ~11 mmag in J0410 and J0430, and ~8 mmag ing, J0515, r, J0660, i, J0861, and z. We present an optimized calibration methodfor the large area multi-filter J-PLUS project, reaching 1-2% accuracy withinan area of 1 022 square degrees without the need for long observing calibrationcampaigns or constant atmospheric monitoring. The proposed method will beadapted for the photometric calibration of J-PAS, that will observe severalthousand square degrees with 56 narrow optical filters.

J-PLUS: photometric calibration of large area multi-filter surveys with stellar and white dwarf loci