What Is a Diff Checker?
A diff checker compares two blocks of text or code and highlights what changed. Use it as an online diff checker for code reviews, config edits, JSON/XML/YAML documents, CSV lists, SQL scripts, or any string comparison where you need clear additions and deletions.
This free tool runs a Myers-style diff in your browser. Choose side-by-side or unified output, switch between line, word, and character granularity, and optionally ignore whitespace or case. Nothing is uploaded.
Side-by-Side, Unified, and Patch Output
Side-by-side comparison keeps original and modified text aligned with line highlighting. Unified view streams changes in one pane—closer to git diff reading. You can also copy a unified patch for sharing or applying elsewhere.
Line, Word, and Character Diffs
Line mode works like a classic code diff checker. Word and character modes add finer highlighting inside changed lines—helpful for string diffs, HTML snippets, or small typo hunts. Ignore whitespace when indentation noise hides real edits.
Diff Checker FAQs
What is a diff checker?
A diff checker compares two versions of text or code and highlights additions and deletions. This online tool supports side-by-side and unified views with line, word, or character granularity.
Can I use this as a JSON, XML, YAML, HTML, CSV, or SQL diff checker?
Yes. Paste any text-based content—JSON, XML, YAML, HTML, CSV, SQL, or plain lists—and compare the two sides. The checker treats everything as text, so formatting differences still show unless you ignore whitespace.
What is the difference between line, word, and character diff?
Line mode highlights whole lines (similar to git diff). Word mode marks changed words within a line. Character mode shows the finest edits, useful for string and character-level differences.
Does ignore whitespace or case change the result?
Ignore whitespace collapses repeated spaces/tabs for comparison. Ignore case treats upper and lower case as equal. The displayed text still comes from your inputs; only matching changes.
Is this a three-way merge or conflict resolver?
No. This page is a two-way online diff checker for inspection. Three-way merges and conflict resolution belong in git or dedicated merge tools after you review the differences.
Is my text uploaded?
No. Comparison runs in your browser. Nothing is sent to LiveTechHacks—free and completely private.