textbytext

Textbytext is a label used in discussions of textual analysis and digital humanities to describe an approach that compares or processes texts on a one-to-one basis, unit by unit, rather than treating entire documents as a single block. The method emphasizes pairing corresponding segments such as sentences, lines, or clauses while attempting to preserve the relative ordering of both texts. The term is not tied to a single standard implementation and is used variably across disciplines.

In practice, textbytext processing involves breaking source texts into discrete units, aligning units across texts, and then computing similarity or differences for each paired unit. Tools may support various unit granularity, such as sentence- or clause-level alignment, and employ metrics like edit distance, cosine similarity on vectorized representations, or specialized alignment heuristics to handle insertions, deletions, and paraphrasing.

Applications include documentary editing and textual criticism, where scholars track changes across editions; translation studies for comparing source and target texts; plagiarism detection by localizing matches; and corpus linguistics for studying stylistic variation. It is also used in machine translation and bilingual corpora alignment to create parallel datasets.

Limitations include sensitivity to unit choice, potential difficulty with loose paraphrase or reordered segments, and computational overhead for large corpora. The term is used informally, and different projects may implement textbytext processing with varying definitions of alignment units and similarity thresholds.

See also: text alignment, parallel corpora, digital humanities, computational linguistics, document comparison.