Tabular Ontology Maker

Rows:

Code Preview

OWL Axioms

No row selected

Ontology Settings

Ontology Label (rdfs:label):
Ontology Creator (dcterms:creator)
Ontology Description (dcterms:description)
Base IRI:

Base IRI Delimiter: / #

IRI Generation

Opaque (sequential) Human-readable (from label)

Leading text: Digits: Starting #:

Entity IRI Preview: http://example.org/ont000001

Label case:

IRI updates when the label changes (for blank/new IRIs).

Fills only blank IRIs using current settings.

Version IRI: [auto-generated]
Version Info: [auto-generated]

Ontology Imports

Add ontology file:

Uses owl:versionIRI when present; otherwise falls back to the ontology IRI.

Add new import IRI:

Manage IRI Prefixes

Prefix	IRI

Manage Predicates & Columns

Add Predicate

Select a common predicate:

Or enter a custom IRI:

Suggestions only include annotation, object, and datatype properties.

Add to views:
Object values:

Manage Existing Columns

Insert Data

Download Starter Template: CSV or XLSX

Drag & drop a file here

- or -

Spreadsheet Ontology

First row is header

Append Data Replace Data

Important User Data Notice

By design, any data that a user inputs stays local to the user's device. Ontology settings and data can be saved in the browser ('Save Session' button), but users are encouraged to export their work ('Export Data' button), since it cannot be otherwise recovered. This is on purpose: I do not harvest your data or process your data. This site does not receive data from a user, and therefore no user data is stored anywhere except locally. If you are interested in storing data on the cloud (on a server), please contact me (jonathan.vajda [at] gmail.com) so I know about your interest and so I can notify you if/when I add that feature.

Copyright 2026, Jonathan Vajda