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Knowledge Graphs (KGs) provide structured, verifiable representations that ground facts and supply large language models (LLMs) with reliable real-world information. Building high-quality KGs from open-domain text remains difficult due to redundancy, inconsistency, and lack of ontology grounding. We present Wikontic, a pipeline that extracts triples from text with LLMs and refines them through ontology-based typing, schema validation, and entity deduplication, yielding compact and coherent graphs. Unlike prior frameworks that lack ontology grounding or perform only partial deduplication, Wikontic uniquely integrates entity canonicalization, alias tracking, and automatic enforcement of Wikidata’s ontology, enabling robust schema-aware construction without manual schema design. Its web interface lets users upload text, visualize graphs, and perform multi-hop question answering. By combining LLM flexibility with Wikidata’s ontological rigor, Wikontic transforms ambiguous text into structured, interpretable, and actionable knowledge.