Prompt Engineering

Line-by-Line Text Diff

Compare two blocks line by line — config, lists, or records — to see exactly which lines were added, removed, or changed.

Overview

Some text is a set of lines where each one stands alone: a config file, a list of settings, rows of records. This loads two config blocks and diffs them line by line, so a changed host, a bumped timeout, and a new pool-size line each show up cleanly. Line mode treats every line as a unit and reports it as added, removed, or unchanged — no word-level merging that would blur which line is which. It is the precise view for line-structured data.

Workflow

Paste the two blocks
Config, settings, or any line-structured text.
Diff line by line
Each line treated as a standalone unit.
Read the added and removed
Changed lines show cleanly, line for line.

Why This Works

Line-structured data is best compared line for line, not word by word
Each line as a unit keeps changed lines distinct and readable
No word merging means no ambiguity about which line changed

Best for

Config files, settings, and records
Line-structured data
Clean added / removed line views

Not for

Reworded prose — word or mixed mode reads better there
Judging whether a config change is correct

Use cases

Config files, settings, and records
Line-structured data
Clean added / removed line views

Customize This Resource

Opens both texts in AI Text Diff Checker. Compare to see the colored diff and the change summary — then adjust the diff mode.

Open in AI Text Diff Checker

Prompt Template

TEXT DIFF REPORT

DIFF SUMMARY
- Mode: Line (line-by-line)
- Lines: 4 added, 3 removed, 0 changed
- Words: 4 inserted, 3 deleted

ADDED CONTENT
+ host=db.internal
+ timeout=60
+ ssl=true
+ pool_size=10

REMOVED CONTENT
- host=localhost
- timeout=30
- ssl=false

MODIFIED CONTENT
- (no in-line modified content)

UNIFIED DIFF
- host=localhost
+ host=db.internal
  port=5432
- timeout=30
+ timeout=60
  retries=3
- ssl=false
+ ssl=true
+ pool_size=10

STATISTICS
- Text A: 5 lines · 5 words · 55 characters
- Text B: 6 lines · 6 words · 69 characters
- Changes: +4 -3 ~0 lines, +4 / -3 words

NOTE
- This is a mechanical diff: it shows what changed, not what it means or which text is better.
- For what a prompt revision MEANS (improvement or regression), use the Prompt Version Diff; for which of two prompts is BETTER, use the Prompt Comparator.

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