Document Analysis and Attachments
Attach files directly to your conversations and ask your local model questions about them. PDFs, code, CSV data, config files - anything text-based works.
All processing happens on your device.
Supported formats
Documents:
- PDF (text extracted natively via PDFKit on iOS, PdfRenderer on Android)
Text and code:
.txt,.md,.log.py,.js,.ts,.jsx,.tsx,.java,.c,.cpp,.h,.swift,.kt,.go,.rs,.rb,.php,.sql,.sh
Data files:
.csv,.json,.xml,.yaml,.yml,.toml,.ini,.cfg,.conf,.html
Limits: 5MB per file. Text is truncated at 50,000 characters for context window management.
How to attach a file
- Open a chat in Off Grid
- Tap the attachment icon in the message bar
- Select Document from the picker
- Choose your file from the system file browser
The file is copied to app storage (so it survives temp cleanup), and the extracted text is attached to your next message.
Tapping to view
Tap any document badge in the chat to open it with the system viewer - QuickLook on iOS, the system intent viewer on Android.
Paste as attachment
If you paste a large block of text into the message field, Off Grid offers to convert it to an attachment instead. This keeps the chat interface clean when you’re passing in large context.
What you can do
Code review:
Attach a file → “Find potential bugs in this code”
PDF analysis:
Attach a contract → “Summarise the key terms and flag anything unusual”
Data analysis:
Attach a CSV → “What are the top 5 items by revenue?”
Config explanation:
Attach a YAML/TOML file → “Explain what this configuration does”
Difference vs knowledge base
Document attachments are per-conversation - you attach something to a specific message and the model sees it in that context window. They’re not indexed or searchable.
The Knowledge Base is project-wide - documents are embedded and indexed, and the model can retrieve relevant chunks from them automatically across many conversations.
Use attachments for one-off analysis. Use the knowledge base for documents you want to reference repeatedly.