A comparison is easier to audit when you know its unit of change. ERITHRA’s Text Difference Checker compares whole lines, showing which stayed the same and which were added or removed. It is useful for short revisions, lists, and plain-text settings where line boundaries carry useful structure.
Supply the two versions
Paste the original into the main text field and the updated version into Revised text. Keep the direction consistent: reversing the inputs reverses what counts as an addition and a removal. Select Process text to see the marked comparison and line totals.
Each input can contain up to 600 lines. For a longer document, compare a focused section at a time and keep enough surrounding context to recognize it. Visual wrapping inside a text field is not a new line unless the input contains an actual newline.
The comparison uses exact line equality. Case, punctuation, and spaces can therefore turn an otherwise similar line into a changed line. It does not paraphrase text, judge whether meaning improved, or find factual contradictions between two passages.
Interpret a changed middle line
Use three original lines: alpha, beta, and gamma. In Revised text, enter alpha, delta, and gamma. The comparison keeps alpha and gamma as unchanged, records beta as removed, and records delta as added.
The metrics show one added line and one removed line. This is one revised line in an editorial sense, but the diff represents it as a removal plus an addition. It does not count individual changed letters inside beta and delta.
If a whole paragraph occupies one long line, changing one word can similarly mark the complete paragraph line as removed and its replacement as added. Keep meaningful paragraph or list boundaries while pasting, but avoid rewrapping text solely to manufacture a smaller-looking change.
Use the output as review evidence
A moved line can appear as an addition and a removal because the algorithm aligns matching sequences; it does not have a special semantic “move” category. Repeated identical lines can also make a particular alignment less intuitive. Read the surrounding text before drawing conclusions.
The operation runs in your browser and does not update either source automatically. Keep both original versions until review is complete. If spacing noise overwhelms the comparison, you can make separate cleaned copies using Remove Extra Spaces, while remembering that cleanup itself changes content. Use Find and Replace Text for a deliberate literal revision, then return here to inspect the affected lines.