Online Text Compare & Diff Checker
Spot differences between two versions of any plain text — log output from before and after a bug fix, two drafts of a document, or two revisions of a code snippet — with a line-by-line diff view showing exactly what was added or removed, no JSON structure required. It is useful for reviewing config changes, documentation revisions, and generated output where a line-by-line text diff is clearer than manual scanning.
How to compare two blocks of text online
Paste the original text into the left box and the changed version into the right box, then click Compare. The tool runs a line-by-line diff and shows exactly which lines were added, removed, or left unchanged — no special format required, unlike a JSON- or code-aware diff tool.
Reading the diff result
Lines marked with a + were added in the changed version; lines marked with a - were present in the original but removed. A running total of additions and removals appears above the diff view, and unchanged lines are shown for context so you can see where in the document a change occurred.
Common use cases
- Comparing log output captured before and after a bug fix to confirm the behavior actually changed
- Reviewing two drafts of documentation or an email before sending
- Diffing plain-text config files that aren't valid JSON or XML
- Spotting exactly what changed between two pasted code snippets without opening a full diff tool
Everything runs locally in your browser — neither block of text is ever uploaded to a server.
How to use Text Compare for related tasks
Paste the original and revised text, compare text online, and follow the highlighted additions, removals, and changed lines.
Related tools: JSON Compare, String Replacer / List Compare.
Frequently asked questions
Does this text compare tool work on plain text, not just code?
Yes — it works on any plain text: log output, documentation drafts, emails, config files, or code. There's no requirement for the input to be valid JSON or any particular format.
Is my text uploaded anywhere when I compare it?
No. The comparison runs entirely in your browser using a local line-diff algorithm — neither side is ever sent to a server.
What counts as a "line" for the diff?
Each line is split on newline characters, exactly as your text is laid out. Reordering or wrapping text differently between the two versions will show as changed lines, since the comparison works line by line, not word by word.
Is there a size limit on how much text I can compare?
The diff algorithm is capped at 5,000 lines per side, which keeps the comparison fast and avoids freezing the browser tab on very large inputs.
What is the easiest way to find differences between two texts?
Use the two input panels and let the diff view show changed lines; for structured data, use the JSON Compare tool instead.