Text Compare
Compare two text files, code snippets, contracts, or drafts side-by-side. 100% private in your browser — zero uploads, instant diffing.
Why Use Universal Text Compare?
Whether you are an engineer comparing configuration files, a legal professional reviewing contract revisions, or a writer inspecting draft edits, spotting subtle differences between two text blocks should be effortless.
Most online diff tools suffer from two major flaws: they upload your sensitive text to remote servers, and their split two-column interfaces are completely broken on mobile devices. Universal Text Compare solves both problems. It runs 100% locally in your browser via Web Workers, ensuring absolute privacy, and features a purpose-built mobile reviewer card that lets you inspect changes one-by-one with dedicated thumb-zone navigation.
Key Features & Comparison Capabilities
- 100% Private & OfflineDiffing computations execute exclusively on your device. Zero text uploaded to servers.
- Mobile-First Reviewer CardSwipe or tap through changes one at a time with clear Before → After context on phones.
- Multiple Diff ModesChoose between Line Diff (code & contracts), Word Diff (articles & prose), and Character Diff.
- Ignore Whitespace & CaseFilter out indentation changes, trailing spaces, or capitalization shifts in a single click.
- Split & Unified ViewsSwitch between git-style unified inline diffs and desktop side-by-side comparisons.
- Versatile Export FormatsCopy unified patches, download .txt diff files, or generate standalone styled .html reports.
Frequently Asked Questions
How do I compare two texts online?
Paste the original version into the left box and the modified version into the right box (or drag and drop text files). The diff updates instantly, highlighting additions in green, removals in red, and modifications with an interactive reviewer card.
Is my text private and secure when using this tool?
Yes, 100%. All diff algorithms run entirely inside your browser via Web Workers and client-side JavaScript. Your text is never uploaded to any server, database, or third-party service.
How does the mobile reviewer work on phones?
Unlike standard desktop two-pane diff tools that break on phone screens, our mobile reviewer displays changes one-at-a-time with before and after context. You can tap Prev and Next on the sticky bottom navigation bar or jump between changes easily.
Can I ignore whitespace or letter case differences?
Yes. Simply check "Ignore Whitespace" to disregard trailing spaces and indentation, or "Ignore Case" to treat uppercase and lowercase characters as identical.
How can I compare JSON files or structured data?
If you paste JSON into Universal Text Compare, the tool automatically detects it and suggests switching to our dedicated JSON Diff Tool (/diff), which provides structured tree comparison, JSON Patch (RFC 6902), and deep merge options.
What export options are available?
You can copy the diff patch to your clipboard, download a standard .txt patch file, or download a self-contained, beautifully styled .html report that can be opened and shared offline.