Diff Checker — Character Counter
Paste text or upload files (text, JSON, best-effort PDF). Compares two inputs and shows character counts, differences, and a line-by-line summary.
Left Input
Chars: 0
Right Input
Chars: 0
Summary
Left: 0 — Right: 0 — Differing positions: 0 (0%)
Line-by-line preview
| Left | Right |
|---|---|
| (empty) | (empty) |
Notes: If your PDF text is not extracted, paste the PDF text manually. For full-featured PDF extraction install pdfjs-dist in the project and refresh.
Supported Features
- Fast character counting for large documents
- Side-by-side line-by-line preview for quick inspection
- Upload or paste input; supports plain text, JSON, and best-effort PDF extraction
- Downloadable plain-text diff reports for audit or review
Why Use This Tool?
- Quickly measure content size and differences before feeding into AI models
- Identify changed lines and approximate edit locations at-a-glance
- Useful for reviewers, auditors, and content engineers who need compact summaries
- Lightweight, browser-only tool — no server upload required for most files