How It Works

Before:
photo.jpg
↓
After:
photo_001.jpg

Automatically adds sequential numbers with customizable padding and format

Numbering Format Options

Basic Sequential Numbering

Format: _001, _002, _003...

Example: "document_001.pdf", "document_002.pdf", "document_003.pdf"

Custom Start Number

Format: _100, _101, _102...

Example: Start numbering from 100 instead of 1

Different Padding

Format: _01, _02, _03... or _0001, _0002, _0003...

Example: Choose 2-digit, 3-digit, or 4-digit padding

Prefix with Numbers

Format: IMG_001, IMG_002, IMG_003...

Example: Add custom prefix before the number

Numbering Options

  • Custom start number (1, 100, 1000, etc.)
  • Flexible padding (1, 2, 3, 4 digits)
  • Prefix and suffix support
  • Sequential or custom increment
  • Preserve file extensions

Windows Compatibility

  • Works with all Windows file types
  • Handles Windows path limitations
  • Preserves Windows file attributes
  • Compatible with Windows 10/11

Batch Processing

  • Process hundreds of files at once
  • Preview numbering sequence before applying
  • Undo functionality available
  • Folder and subdirectory support

Ready to Number Your Files?

Automatically number your Windows files with our free online tool

🚀 Start Numbering Now 📖 Learn More

Why Auto-Number Your Files?

Auto-numbering files is one of the most effective ways to organize large collections of files on Windows. It creates consistent, sequential naming patterns that make files easy to sort, find, and manage. Whether you're organizing photos, documents, or project files, automatic numbering ensures a logical order that's maintained across different systems and applications.

Our free online auto-numbering tool provides flexible options for customizing the numbering format, including start numbers, padding, and prefix/suffix combinations. This makes it perfect for various use cases, from simple photo organization to complex project file management.

Common Use Cases

  • Photo Organization: Number photos from events, vacations, or projects sequentially
  • Document Management: Create numbered document series for reports, proposals, or contracts
  • Project Files: Number project files, versions, or iterations systematically
  • Media Collections: Organize music, videos, or other media files with consistent numbering
  • Backup Files: Number backup files for easy identification and restoration
  • Archive Organization: Create numbered archive files for long-term storage

Numbering Format Examples

  • Basic: "file_001.txt", "file_002.txt", "file_003.txt"
  • With Prefix: "IMG_001.jpg", "IMG_002.jpg", "IMG_003.jpg"
  • Custom Start: "document_100.pdf", "document_101.pdf", "document_102.pdf"
  • Different Padding: "photo_01.png", "photo_02.png", "photo_03.png"
  • With Suffix: "report_001_final.docx", "report_002_final.docx"

Best Practices

  • Choose appropriate padding based on total file count
  • Use consistent separators (underscores or hyphens)
  • Consider your file sorting needs when choosing number placement
  • Test with a small batch before processing large collections
  • Document your numbering convention for team consistency
  • Use meaningful prefixes to identify file categories