Everything you need to get up and running on Mac or Windows.
Pick your platform and follow the steps
After purchasing, download Fast-Batch-Renamer-Mac.zip from your Gumroad receipt, or install directly from the App Store.
Double-click the zip to extract it. You'll see Fast Batch Renamer.app.
Right-click the app and choose Open (do not double-click).
A dialog appears asking if you're sure. Click Open again.
The app launches normally. This only needs to happen once.
From now on, double-click opens the app as usual.
Optional: drag Fast Batch Renamer.app into your Applications folder for easy access from Spotlight.
Apple requires a $300/year certificate to bypass this prompt. As an indie app, the Gumroad version skips this cost. The app is completely safe. The App Store version has no such prompt at all.
After purchasing on Gumroad, download Fast-Batch-Renamer-Windows.zip from your receipt email.
Right-click the zip and choose Extract All. Open the extracted folder.
Double-click FastBatchRenamer.exe to launch.
If Windows Defender SmartScreen appears, click More info then Run anyway. This is normal for new apps without an expensive publisher certificate.
Right-click FastBatchRenamer.exe and choose Pin to taskbar or create a desktop shortcut for quick access.
No installer needed. The app is fully portable.
Windows flags apps that don't have an EV code-signing certificate (costs $300-500/year). The app contains no malware. If you're unsure, scan the .exe with VirusTotal before running.
Rename your first batch of files in under a minute
Drag and drop a folder onto the app window
or click Browse and select a folder.
All files appear in the list instantly.
Click Preview to see every new filename before anything changes.
Click Apply Rename when ready.
Made a mistake? Hit Undo to restore everything instantly.
Copy a column of names from Excel, Google Sheets, or a ChatGPT response.
Click Paste Names in the app and files are renamed in order.
No other tool on Mac or Windows does this as simply.
Common issues and how to fix them
This happens because macOS blocks unsigned apps on first launch.
After doing this once, double-click works normally forever.
This is a macOS Gatekeeper quarantine flag. Open Terminal and run:
xattr -cr "/Applications/Fast Batch Renamer.app"
Or drag the .app file into the Terminal after typing xattr -cr (with a space at the end), then press Return.
.) are excluded by designMost common causes:
For permissions: right-click the folder in Finder, choose Get Info, and check the Sharing and Permissions section at the bottom.
Undo only works immediately after a rename in the same session.
Expected performance benchmarks:
For best results, work with batches under 1,000 files at a time and close other memory-heavy apps.
This is normal for new apps without an expensive publisher certificate.
This only appears the first time. If you want to verify the file is safe, scan it at virustotal.com before running.
Some antivirus tools flag PyInstaller-packaged apps as suspicious even when they contain no malware. This is a known false positive with Python-based executables.
Make sure you extracted the full zip before running. Running the .exe directly from inside the zip without extracting it will cause a crash.
FastBatchRenamer.exeMost common causes on Windows:
\ / : * ? " < > |Both versions are lightweight and work on almost any machine
Direct line to the developer, not a bot
Built and maintained by Salman Naseem. Every support request is answered personally, usually within 24 hours.
support@fastrename.comFor fastest help, include your OS version (e.g. macOS 14 or Windows 11) and your Gumroad order number.
Learn more, watch demos, and stay up to date
See the Windows version in action, including Excel and ChatGPT paste.
Watch on YouTubeCheck your Gumroad receipt link for the latest version download. Updates are free for life.