Text Diff Checker
Compare two blocks of text and see added, removed and unchanged lines, aligned with a longest-common-subsequence diff just like version-control tools.
About the text diff checker
Compare two blocks of text and see exactly what changed — added, removed and unchanged lines highlighted side by side. Bytewrench uses a longest-common-subsequence diff, the same approach as version-control tools, so it aligns matching lines correctly instead of just comparing line-by-line.
Great for comparing config files, copy revisions, logs or any two versions of text. It runs entirely in your browser.
Clear color-coded highlighting of insertions and deletions.
Matches up unchanged lines properly, like git diff.
Counts of added and removed lines at a glance.
Both texts stay in your browser.
Frequently asked questions
Does it diff by line or by word?
It compares line by line using a longest-common-subsequence algorithm, which is ideal for code, config and prose paragraphs.
Is the comparison case-sensitive?
Yes, lines must match exactly (including case and whitespace) to be considered unchanged.
Can I compare large files?
It runs in your browser and handles typical files quickly; extremely large inputs may be slower since diffing is computationally heavier than plain text ops.
Is my text uploaded?
No. The diff is computed entirely in your browser.