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Supported File Types

Knowledge Bases supports a wide range of file formats:

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Text Documents

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

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Images

  • .png, .jpg, .jpeg

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Documents

  • .pdf, .docx,
  • .pptx
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.

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Spreadsheets

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

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Audio Files

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

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File Limitations

When uploading files to Knowledge Bases, keep these current limitations in mind:

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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.

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Document Count Per Chat

Best Practice: For optimal results, upload 3-5 documents per chat. Adding more than 5 documents at once may reduce accuracy, and uploading 15+ documents often causes processing errors—even with shorter documents.
While individual files can be up to 2500 pages, the number of documents in a single chat significantly impacts performance. If you need to work with many documents, consider:
  • Breaking your work across multiple chats
  • Focusing each chat on a specific subset of related documents