> ## Documentation Index
> Fetch the complete documentation index at: https://docs.gc.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported File Types

> Learn about the file types and limitations supported in GC AI

## Supported File Types

GC AI supports a wide range of file formats:

### Text Documents

* .txt, .md, .markdown
* .json, .html, .htm
* .rtf

### Images

* .png, .jpg, .jpeg

### Documents

* .pdf, .docx,
* .pptx

<Note>
  **Enhanced Document Features**: For PDF and DOCX files, GC AI automatically reads and analyzes:

  * Tracked changes and revision history
  * Comments and reviewer feedback
  * Redlines and proposed modifications

  **Date Requirement**: These enhanced features are only available for PDF and Word files uploaded since August 18, 2025. Files uploaded before this date will be processed without comment and tracked change analysis.
</Note>

### Spreadsheets

* .xlsx, .xls, .xlsm
* .ods, .csv, .tsv
* .numbers

### Audio Files

* .mp3, .m4a
* .wav, .webm
* .ogg, .flac

<Note>
  **Audio Transcription**: Audio files are automatically transcribed using speech-to-text technology. The transcribed text becomes searchable and can be referenced in your chats just like any other document.
</Note>

## File Limitations

When uploading files, keep these current limitations in mind:

### Per-File Limits

* No .zip: files must be unzipped or uncompressed.
* Each file must be under 50MB.
* Each file is limited to 2500 pages maximum.

### Working with Multiple Documents

GC AI uses smart, on-demand document access. The AI reads, searches, and queries your documents as needed rather than loading everything into the context window at once. This lets you attach more documents to a chat than traditional approaches allow.

<Note>
  For very large document sets, the [context usage indicator](/docs/chat/context-window) helps you monitor how much context is being used. If you're approaching the limit, consider starting a new chat for a fresh context window.
</Note>