Text Diff Checker
Paste two texts and see the differences between them highlighted visually. Choose to compare by characters, words, or lines. Additions are shown in green, deletions in red. The diff algorithm produces a minimal edit sequence, so only the actual changes are highlighted.
What it does
- ▸Compares two texts by characters, words, or lines
- ▸Visual highlighting: green for additions, red for deletions
- ▸Uses a diff algorithm that produces minimal edit sequences
- ▸Shows a summary of additions and deletions count
- ▸Handles multi-line text with proper line-by-line comparison
Use cases
- ▸Comparing two versions of a document or configuration file
- ▸Checking what changed between two API responses
- ▸Reviewing edits to a text file before committing
- ▸Debugging subtle differences between expected and actual output
How it works
Paste the original text in the left pane and the modified text in the right pane
Choose comparison mode: characters, words, or lines
The diff is computed and displayed with highlighted changes
Review the additions and deletions in the output
Frequently asked questions
1What's the difference between character, word, and line diff?
Character diff shows every changed character — useful for finding small typos. Word diff highlights changed words — good for prose. Line diff highlights entire changed lines — best for code and configuration files where line-level changes matter most.
2How does the diff algorithm work?
The tool uses the Myers diff algorithm, which finds the shortest edit script between two sequences. This produces a minimal set of insertions and deletions, so the diff shows only what actually changed without unnecessary noise.
3Can I compare very large texts?
Yes. The diff algorithm is efficient (O(ND) where N is the text length and D is the number of differences). For very large files, line-mode comparison is faster than character-mode because it processes fewer elements.
Related tools
JSON Diff
Structural comparison of two JSON documents — key order and formatting ignored
Git Diff Parser
Parse unified git diff output — file list, additions/deletions, hunk breakdown, stats, structured JSON
Line Filter (grep)
Filter lines by plain text, keywords or a regex — like grep, but visual
Line Sort/Dedupe
Sort, deduplicate, reverse and trim lines of text
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