Text & Code Difference Checker

The text diff tool supports over 50 languages including JavaScript, TypeScript, Python, Java, Go, Rust, PHP, Ruby, C/C++, HTML, CSS, SQL, YAML, JSON, XML, Markdown, and plain text. Select your language from the dropdown to enable syntax highlighting.

There is no hard character limit for pasting text directly. For uploaded files, very large files (typically above a few MB) may be slow to render in the editor — for best results keep individual files under 1 MB.

No. Text you paste into the editors is sent to the server only to compute the diff, and it is not logged or stored. Comparisons happen in memory and the result is returned immediately.

Side-by-side view shows the original and modified text in two columns, making it easy to compare changes visually. Inline (line-by-line) view shows all changes in a single column with additions and deletions interleaved — better for narrow screens or dense diffs.

Yes. Paste or upload your JSON, XML, or YAML content, then select the matching language from the dropdown. The diff will be computed on the raw text, so formatting differences (like indentation) will also show up as changes.

The removals count is the number of red lines — lines that existed in the original but not in the modified version. Additions is the count of green lines. This is the same line-level counting used by git and most professional diff tools. The count is unaffected by which precision mode (Smart/Word/Char) you choose or by Hide Unchanged — only Ignore Whitespace and Ignore Case can reduce the count, because they change which lines the tool considers equal.

Ignore Case works at the line level: a line that differs only in capitalisation is treated as unchanged and does not appear in the diff at all. Once a line is identified as changed because it has a real edit, the highlighting shows all textual differences within that line — including any capitalisation differences on the same line. This matches the behaviour of git diff --ignore-case. If you want to know whether a line changed beyond just casing, check whether it appears red or green — if it does, there is a real difference; the highlighted words then show you exactly what changed.

FreeDiffChecker applies fair-use rate limits to keep the service fast and reliable for everyone. If you see this error, wait a moment before trying again. If you regularly need to run a large number of comparisons in a short time, please contact us.