ORTOFON v3 is a corpus of authentic spoken Czech used in informal situations (private environment, spontaneity, unpreparedness etc.) that covers the area of the whole Czech Republic. The corpus is composed of 697 recordings from 2012–2020 and contains 2 445 793 orthographic words (i.e. a total of 2 976 742 tokens including punctuation); a total of 1 121 different speakers appear in the probes. ORTOFON v3 is partially balanced regarding the basic sociolinguistic speaker categories (gender, age group, level of education and region of childhood residence). The transcription is linked to the corresponding audio track. Unlike the ORAL-series corpora, the transcription was carried out on two main tiers, orthographic and phonetic, supplemented by an additional metalanguage tier. ORTOFON v3 is lemmatized and morphologically tagged according to the SYN2020 standard. This was performed with special attention paid to the specificity of the informal spoken Czech and includes also spoken training data. The (anonymized) corpus is provided in a (semi-XML) vertical format used as an input to the Manatee query engine. The data thus correspond to the corpus available via the KonText query engine to registered users of the CNC at http://www.korpus.cz Please note: this item includes only the transcriptions, audio (and the transcripts in their original format) is available under more restrictive non-CC license at http://hdl.handle.net/11234/1-5686