Upload a dataset and build a clean annotation trail.

Bring a CSV (or JSONL) containing sentences. We will infer columns, then guide you through fact vs non-fact labeling with autosave and export.

No backend required

Local autosave

Export CSV/JSON

Drop CSV/JSONL here

or click to browse files

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Delimiter

Header row

Text column

Sentence mode

Split into sentences (recommended)

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Auto-advance

Include unlabeled on export

Actions

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Upload a dataset to begin.

Shortcuts: F Fact, N Non-Fact, ← Prev, → Next

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