AFileFix Document Comparison vs Diffchecker

AFileFix Document Comparison is a free web tool for comparing one pair of document versions. It identifies added, removed, and modified text in PDF or DOCX files, including mixed-format pairs, with a 25 MB limit per file. Results appear on screen, and a downloadable DOCX report provides analysis and plain-English explanations of each change and why it might matter. The tool is recommended for structured, text-heavy documents such as contracts, policies, proposals, terms of service, and manuals.

Both files are sent to Anthropic's Claude API for processing. AFileFix says it removes uploaded files from its server within minutes. Anthropic retains API data for up to 30 days for safety review, then deletes it, and does not use it to train AI models. The comparison covers text, not layout-only changes such as fonts, spacing, page breaks, or margins. Scanned and password-protected PDFs are unsupported, and the tool does not OCR scanned files. Documents over approximately 150 pages may be truncated. It does not provide three-way comparison, Word track changes, or legal redline output.

Diffchecker compares text, code, and data in a browser or offline with its desktop app, highlighting additions, removals, and edits. Text comparisons can use side-by-side or unified views, adjustable precision, custom ignore rules, syntax highlighting, real-time editing, and change merging. Listed comparison options also include documents, images, spreadsheets, and folders, with features such as OCR, redlines, formula detection, and batch comparison. Basic is free, but some tools have monthly use limits: unified view and real-time editing each allow five tries, while character-level differences and merge changes each allow ten. Pro + Desktop costs $15 a month per user and includes offline comparisons with desktop apps for Windows, Mac, and Linux. Legal costs $20 a month per user and adds iManage integration and comparison-setting profiles. Enterprise costs $40 a month per user with annual billing, and includes SAML SSO, SCIM provisioning, and dedicated support. Browser comparisons stay in the browser unless saved and shared; Desktop comparisons run locally. The site states browser traffic is TLS-encrypted and its security program is ISO/IEC 27001 certified.