File Attachments
Attach files to give Atom visual reference, data, or audio context. Drag and drop files into the chat, or paste from your clipboard.
Supported File Types
| Type | Formats | Size Limit |
|---|---|---|
| Images | PNG, JPEG, GIF, WebP, TIFF, BMP, SVG, HEIC, HEIF | 12 MB |
| PDFs | 10 MB | |
| Documents | Word (.doc, .docx, .docm), Excel (.xls, .xlsx), PowerPoint (.ppt, .pptx), RTF, Pages, ODT | 10 MB |
| Text | TXT, Markdown, CSV, TSV, JSON, HTML, XML | 1 MB |
| Audio | WAV, MP3 | 10 MB |
Video files are not currently supported.
How to Attach Files
- Drag and drop — Drag files directly into the chat input area
- Paste — Copy an image or file and paste with Cmd/Ctrl+V
- Browse — Click the
+button in the input bar to pick files from disk
Attached files appear as cards below your message. You can remove an attachment before sending by clicking the X on its card.
What Happens to Your Files
- Images — Resized to max 1568px on the longest edge and compressed for efficient transmission
- PDFs and documents — Sent as-is to the AI model, which extracts and reads the content
- Text files — Read and included directly in your message context
- Audio — Sent as base64-encoded data for models that support audio input
Use Cases
Data-driven animation Attach a CSV or Excel file and ask Atom to create animated charts, graphs, or data visualizations.
Design references Drag in a mood board, style frame, or client composition. Ask Atom to match colors, spacing, or animation style.
Technical specs Attach a PDF brief with dimensions, timing charts, or brand guidelines.
Audio sync Include an audio file and ask Atom to analyze beats or create markers for sync points.
Privacy
Files you attach are sent through your selected provider. Only attach files you’re comfortable sharing with OpenAI, Anthropic, or the provider you configured through OpenCode.
Atom sends composition frame previews to give the AI visual context of your work. It does not automatically attach full-resolution source footage or final renders; broader file access depends on the security mode you select.