Diff Checker: Compare Two Texts
Paste two versions of a document or code snippet, see exactly what changed, and download a simple diff. Everything runs in your browser, with no accounts or uploads.
Text you paste here never leaves your browser.
The diff is computed entirely on your device. You can safely compare drafts, emails, or snippets of code without sending them to a server.
Original
Modified
Diff results
Green highlights show additions, red highlights show removals, and plain text is unchanged.
Original with removals
Paste text above and start editing to see differences.
Modified with additions
Paste text above and start editing to see differences.
Legend
- Green – added text
- Red – removed text
- Plain – unchanged text
Compare edits and revisions without heavy tooling
A diff checker highlights how one version of text differs from another. It is useful when reviewing edits to blog posts, checking email drafts, or comparing snippets of code before a commit. Instead of scanning line by line, you can see additions and deletions at a glance, with subtle color cues for what changed.
Use cases for a lightweight diff tool
- Comparing versions of copy. Paste an earlier draft on the left and a new draft on the right to see what a collaborator changed.
- Reviewing small code changes. Before committing, you can quickly compare two snippets to be sure nothing unexpected slipped in.
- Tracking edits to support replies or emails. If you write a sensitive response, it can be helpful to check exactly what changed between versions.
Line‑based vs word‑based diffs
Line‑based diffs treat each line as a unit, which works well for code and structured text. Word‑based diffs zoom in further and highlight individual word changes inside a line. This tool lets you toggle between those modes so you can either see high‑level structure or fine‑grained edits, depending on what you are reviewing.
Client‑side privacy for sensitive content
Many diff services upload your text to a remote server. That may not be ideal if you are comparing contracts, internal docs, or private messages. This Diff Checker runs entirely in your browser; the algorithm runs locally and nothing is sent to LifeHackToolbox or any third party. You can paste sensitive text, compare versions, and close the tab knowing the content never left your device.
Part of a small toolkit of text utilities
This page is built to pair with other developer‑friendly tools such as the JSON Linter & Formatter and future text utilities under a "Developer Tools" or "Text & Comparison" section. Instead of a heavy IDE or complex version‑control UI, you get a simple browser tab that does one job cleanly.
For more structured programming workflows you might still want full version control, but for quick checks—diffing two small files, reviewing an email rewrite, or comparing JSON payloads—this tool is faster to open and easier to share with non‑technical teammates.