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Compare text, code, JSON, or YAML line-by-line with word-level highlighting, split and unified views, and whitespace/case-aware matching.
Every tool runs entirely in your browser. Nothing you type is uploaded, stored, or logged on our servers.
The Diff Tool automatically normalizes and alphabetizes JSON and YAML keys before comparing, so reordered or reformatted fields never show up as fake changes — you only see real data differences. No other online diff checker does this out of the box.
Beyond structured data, it helps you instantly compare two text inputs and visually highlight differences. Whether you’re reviewing code changes, editing articles, or checking JSON or YAML responses, this tool makes it effortless to spot additions, deletions, and modifications.
It’s entirely browser-based — nothing is sent to a server. Paste your old and new text, upload files, or drag and drop them straight into either pane, and see what changed in milliseconds with color-coded highlights.
Fine-tune the comparison with ignore whitespace and ignore case toggles, collapse unchanged lines to focus on what matters, switch between split and unified views, and copy the result as a unified diff patch — complete with an additions/deletions/similarity breakdown.
Useful for developers, writers, and QA testers who need a clean, fast, and private way to compare text, JSON, YAML, or code blocks without relying on external tools or IDEs.
How it works: lines are compared using the same Myers shortest-edit-script algorithm Git uses, then changed lines are diffed again at the word level so you can see exactly what changed inside a line — not just that it changed.
Yes — this is the tool's standout feature. When both inputs are valid JSON or both are valid YAML, keys are automatically normalized and alphabetized before diffing, so reordered or reformatted fields never show up as fake changes. You only see real data differences, not key-ordering noise.
Most diff tools compare text byte-for-byte, so a JSON object with the same data but keys in a different order looks like a huge change. Normalizing keys first means the diff reflects actual data changes, which is especially useful when comparing API responses, config files, or generated output.
You can compare plain text, code snippets, configuration files, JSON, YAML, markdown, and most line-based content.
The tool marks added, removed, and changed lines so you can scan edits quickly.
Yes. It is useful for validating patch output, generated code, and content revisions before commit.
Yes. Inputs are processed in your browser and are not sent to a backend service.
Yes. Use the Upload File button on either pane, or drag and drop a file directly onto it. Common text, code, and data formats are supported.
Yes. Toggle "Ignore whitespace" or "Ignore case" before comparing to skip formatting-only differences and focus on meaningful changes. You can also hide unchanged lines to see just the edits.
Yes. After comparing, use Copy Patch to copy the result as a standard unified diff patch, along with a summary of additions, deletions, and similarity percentage.