Text Diff Checker
Compare two versions line by line. Your text stays entirely in this browser.
OriginalRevised
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How to compare two texts
- Add both versions. Paste text, or upload a supported text-based file, on each side.
- Set your options. Choose whether to ignore case or whitespace, and optionally hide unchanged lines.
- Review the diff. See aligned edits with word-level highlighting.
- Export. Download a paginated, landscape PDF comparison report if you need one.
What happens to your text
Both files are compared entirely in your browser — nothing is uploaded to OpenToolkit at any point.
What this checker supports
InputPasted text, or TXT, Markdown, CSV, JSON, YAML, XML, HTML, CSS and source-code files
File limit5 MB per file
ComparisonAligned lines with word- and punctuation-level highlighting
CountsSeparate changed, added and removed counts
OutputLocal, side-by-side PDF report generation
ProcessingEntirely in your browser tab
Common reasons to compare texts
- Review exactly what changed between two drafts of a document.
- Compare two versions of a config file before deploying it.
- Check a translated or edited text against the original.
- Generate a shareable PDF diff report for a code or content review.
Frequently asked questions
Is my text uploaded anywhere?
No. Both sides are compared entirely in your browser tab.
Is there a file size limit?
Yes — 5 MB per file, to keep the comparison responsive.
What file types are supported?
TXT, Markdown, CSV, JSON, YAML, XML, HTML, CSS and common source-code files, alongside plain pasted text.
Can I ignore formatting-only differences?
Yes — turn on "ignore whitespace" and/or case when spacing or capitalization differences aren't relevant to the review.
Can I share the result with someone else?
Yes — download the comparison as a paginated, landscape PDF report.
Does it highlight whole lines or specific words?
Word- and punctuation-level highlighting within each aligned line, not just whole-line differences.
Last reviewed: August 2026