Text Diff Checker
Compare two text blocks and find differences
About the Text Diff Checker
Spotting what changed between two versions of text — a contract clause, a config file, a paragraph of copy — is slow and error-prone by eye. Text Diff compares two blocks line by line and highlights exactly which lines were added, removed, or left unchanged.
Writers compare draft revisions, developers eyeball changes outside of version control, and anyone reviewing edits uses it to see precisely what moved. It marks each line with a clear +, −, or space prefix and line numbers, so the differences read like a familiar code diff without needing any tooling.
How to Use the Text Diff Checker
- Paste the original version into the "Original Text" box.
- Paste the updated version into the "Modified Text" box.
- Read the line-by-line diff: additions, removals, and unchanged lines are color-coded.
- Copy the diff with its +/− markers to share or save.
Why Use ToolForge’s Text Diff Checker
- It compares line by line and color-codes additions, removals, and unchanged lines, so changes are obvious at a glance.
- It numbers the lines and marks empty lines explicitly, so you can pinpoint exactly where a change sits.
- It needs no setup or version control — just paste two versions and compare.
- Both texts are compared in your browser and never uploaded, which matters for confidential documents.
Frequently Asked Questions
Does this compare line by line or word by word?
It works at the line level: each line in the original is compared against the corresponding line in the modified text. A line that changed shows as a removal of the old line and an addition of the new one, which makes structural changes easy to follow.
Can I compare code with it?
Yes. Because it diffs plain text by line, it works well for code, configuration files, and data as well as prose. For ongoing code work, a version-control diff offers more, but this is ideal for a quick one-off comparison.
Is my text kept private?
Yes. The comparison runs entirely in your browser and neither block of text is sent anywhere, so you can safely diff sensitive contracts, drafts, or configuration.
Why is a whole line shown as both removed and added when I only changed a word?
Because the comparison works line by line, any change within a line is represented as the old line being removed and the new line added. This keeps the diff simple and unambiguous; reading the pair side by side shows you the word that changed.
