Text Diff Checker
Paste an original and a changed version of any text and instantly see the differences — added lines in green, removed lines in red — line by line.
Paste the original text on the left and the changed text on the right. The tool runs a line-by-line diff and highlights added lines in green and removed lines in red, with a count of each. It all runs privately in your browser.
Zero Server Uploads
Files process in local RAM
Instant WASM Speed
No waiting queues or lags
Unlimited Batching
Convert files without limits
Suggest a Feature or Improvement for Text Diff Checker
Need custom options, higher limits, or extra format support? Let our engineering team know!
How to use Text Diff Checker
- 1Paste the original text in the first box.
- 2Paste the changed version in the second box.
- 3Read the highlighted diff — green is added, red is removed.
See exactly what changed
Compare two drafts of an email, two versions of a config file, or before/after copy. The diff uses a longest-common-subsequence algorithm, so it aligns matching lines and only highlights genuine changes — no noise.
Frequently Asked Questions
Is my text sent to a server?
No. The comparison runs entirely in your browser — nothing is uploaded.
Does it compare word by word?
It compares line by line, which is the clearest view for documents, code, and lists.