"What changed?" — drag & drop any file to find out. Text, images, PDF, Excel, audio, video. Compare, review, and merge in one app.
Diff Pro Max is a professional-grade file comparison tool designed to be easy for anyone to use — no technical expertise required.
"What changed?" — answered in seconds.
Manually comparing files line by line is slow and error-prone. Diff Pro Max detects and highlights every change automatically. Just drag and drop two files.
Text, images, audio, video, PDF, Excel — whatever the format, differences are instantly visible.
Sound familiar?
• You edited the code, but can't remember exactly what changed
• The designer says "I updated it" but you can't spot the difference
• You need to verify which version of a document was sent to the client
• You're about to deliver, but want to double-check everything
Diff Pro Max lets you compare, review, and merge — all in one place.
【Key Features】
■ Text Compare
- Syntax highlighting for 150+ languages
- Hunk View and Split View modes
- Inline diff for character-level changes
- Regex search and quick navigation
- Merge mode: select left or right per hunk and save the result [New]
■ Folder Compare
- Hierarchical directory tree view
- Color-coded file status (added, changed, deleted)
- Exclusion patterns to skip unwanted files
- Date range filtering for specific periods
- Fast performance with 1000+ files
■ Image Compare
- Side-by-side visual comparison
- Overlay mode for detailed diff
- Synced zoom and pan controls
■ Audio Compare
- Waveform visualization for visual comparison
- Synchronized playback to hear differences
- Metadata comparison (format, bitrate, sample rate, etc.)
- Supports MP3, WAV, AAC, FLAC and more
■ Video Compare
- A/B switching for instant comparison
- Synchronized playback mode
- Supports MP4, MOV, WebM, AVI, MKV and more
■ Document Compare [New]
- Visual comparison for PDF, Word, and PowerPoint
- Page-level diff detection with overlay view
- Page sync and scroll sync
■ Excel Compare [New]
- Cell-level diff for spreadsheets
- Color-coded additions, changes, and deletions
- Multi-sheet comparison
■ Change Groups (Version Management) [New]
- Save file snapshots for version tracking
- Organize versions by group
- Instantly compare with past versions
- Supports all file types: text, image, audio, video, documents, Excel
■ Delivery Package
- Extract files for FTP upload efficiently
- Preserve directory structure
- Auto-detect updated files by date range
- Save and reuse settings with presets
【Additional Features】
- Bilingual support (English / Japanese)
- Dark mode and Light mode
- Intuitive drag & drop interface
- Preset manager for frequently used settings
- History for quick replay of past comparisons
- Multiple export formats (TXT, CSV, HTML, PDF)
【Perfect For】
- Software Engineers — Code diffs, config file merging
- Web Designers — Compare design mockups
- Video & Audio Creators — Compare edits and mixes
- Writers & Editors — Track manuscript revisions
- Business Professionals — Manage contract and proposal changes
- Students & Researchers — Version control for papers and reports
- Project Managers — Delivery data creation and management
- Everyone — Track changes in important documents and files
【Pro】$17 one-time purchase
- Unlimited comparisons for all modes
- Unlimited text merge
- Export to CSV, HTML, PDF
- Advanced filtering and presets
- No watermark
Free version includes unlimited text comparison. Other modes allow 3 uses per day.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
Major update: the comparison engine has been significantly upgraded.
■ New
- OCR for scanned PDFs: scanned documents without a text layer can now be analyzed with on-device OCR to detect differences (fully offline; English, Japanese, German, French).
- Tracked-changes view for Word: a redline view showing deletions with strikethrough and insertions with underline, inline in a single document.
- Pixel diff for images: visualize the actual differences between two images with red highlights, with an adjustable threshold and fullscreen support.
- Comparison report export: save text comparison results as a shareable HTML report.
■ Improved
- Excel: inserting a row no longer marks every following row as "changed" (row matching rebuilt).
- Fixed Excel dates being displayed as serial numbers (e.g. 44927).
- Removed remaining Japanese text from English, German, and French screens.
■ Fixed
- Change Review: could not create a second group even after purchase.
- Restore Purchases could fail to re-enable the add-on.
- Audio comparison: the results panel was not displayed.
- Text comparison: "Ignore whitespace" corrupted the displayed text.
- Many additional bug fixes and stability improvements.
Version 1.9.2
The developer, Ryota Kimura, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
