AFileFix Document Comparison

AFileFix Document Comparison is a free web tool for comparing two PDF or DOCX files and reviewing an explained change report. It is best for people checking text-heavy documents who want a focused, no-signup workflow. Its text analysis can help surface wording changes, but it cannot replace a visual check or formal redline process.

Overview

Each run compares one pair of files, identifying added, removed, and modified content. You can review results on screen or download a DOCX report. The plain-English explanation for each change adds useful context about its possible significance, rather than leaving readers to interpret a list of differences alone.

PDF and DOCX files can be paired in either combination, with a maximum of 25 MB per file. That makes it workable when versions arrive in different formats. The workflow remains deliberately narrow: there is no automatic three-way comparison, Word track changes, or legal redline output.

Key features

Text comparison and explained changes

The tool is aimed at structured, text-heavy material such as contracts, policies, proposals, terms of service, and manuals. That focus suits readers primarily concerned with wording. It will not identify layout-only edits to fonts, spacing, page breaks, or margins, so presentation-sensitive documents still need a separate visual review.

File handling and privacy

Scanned PDFs and password-protected PDFs are unsupported, and there is no OCR for scanned pages. Documents over approximately 150 pages may be truncated, leaving content beyond the analyzed portion out of the comparison. Those restrictions make AFileFix a poor fit for scanned archives, protected files, or long manuals that need complete coverage.

Both documents are sent to Anthropic's Claude API for processing. AFileFix says it deletes files from its server within minutes after processing; Anthropic retains API data for up to 30 days for safety review, then permanently deletes it and does not use it to train AI models. That is a defined retention policy, but readers handling sensitive material should weigh third-party processing and the retention window against their own requirements.

Pricing

Free — free. The plan requires no signup and includes PDF or DOCX comparison, with files up to 25 MB each. The approximately 150-page truncation risk still applies. For an occasional, one-pair review, the lack of a fee or account requirement is a clear advantage. Readers needing longer documents, visual comparisons, or formal redlines will not solve those needs by choosing this plan.

Platforms

AFileFix runs on the web, so it suits readers who want to compare documents in a browser rather than use a desktop application. It is not a multi-platform desktop or mobile product.

Who it's for

Choose AFileFix for an occasional check of a text-heavy contract, policy, proposal, or manual when a pairwise comparison and explained changes are enough. Look elsewhere if you need scans handled with OCR, a complete analysis of a very long file, visual formatting checks, three-way comparison, or a legal redline workflow.

Pros and cons

• Pros: The free, no-signup plan makes a one-off comparison easy to start without a commitment.
• Pros: Mixed PDF and DOCX pairs are accepted, and each change comes with a plain-English explanation.
• Pros: An on-screen review and downloadable DOCX report give readers two ways to work with the results.
• Cons: Scanned and password-protected PDFs cannot be compared, and there is no OCR.
• Cons: Files over approximately 150 pages may be truncated, so the report may not cover the entire document.
• Cons: It compares text only, with no formatting detection, three-way mode, Word track changes, or legal redline output.
• Cons: Processing involves Anthropic's API, which retains data for up to 30 days for safety review.

Alternatives

Document Comparison Software is the broader category list for readers who want to compare more options before choosing.

• PDF24 Compare PDF is a free alternative across web, desktop, and mobile platforms; choose it if you want a PDF comparison tool with no registration, time, or usage limits.
• SmarterDiff is free for personal and commercial use, ad-supported, and available across web, desktop, and mobile platforms; it suits readers who want that broader availability without an account or artificial limits.
• Diffchecker has a free Basic plan with some features limited by monthly try counts and a Pro + Desktop plan at $15 a month; consider it if you prefer a freemium option with paid access to Pro features.
• Compare Suite is a Windows freemium option; it may suit readers looking for desktop comparison software rather than a browser-based tool.
• Differino offers one free comparison with 45 MB per-file limits, PDF, DOCX, and TXT support, 24-hour share links, watermarked PDF export, two versions per document, and 14-day retention; choose it if those sharing and version features match your workflow.
• DocFather Compare Documents offers 250 welcome AI credits and free file tools for files up to 300 MB; consider it if its larger stated file ceiling better suits your files.
• Document Delta provides a free demo for DOCX files up to 500 KB each with no signup or cost; it is an option for a small DOCX test comparison.
• PdfCompare.app is a free web alternative with no account requirement, daily file limits, page limits, file-size ceilings, or watermarks; choose it if those stated limits are a priority.

Verdict

AFileFix is a sensible pick for readers who want a free, no-signup way to compare one pair of text-heavy PDF or DOCX documents and get explanations alongside the changes. The main reason to choose it is that combination of accessible file handling and readable change context. Look elsewhere when completeness, visual changes, scan support, or formal redlining matters more than a quick text-focused review.