---
title: File types
sidebar:
  label: Overview
description: How each kind of file opens, and how to get at the raw bytes.
---

<video className="drop-video" src="/videos/formats.mp4" poster="/videos/formats.jpg" controls muted playsInline preload="none" aria-label="A markdown file with frontmatter, a CSV as a table, and a diff, each opening in jalco-drop" />

| Upload | Opens as |
| --- | --- |
| Code and text (about 70 languages) | Highlighted in your [code theme](/v1.0/settings), with line links like `#L12` |
| Terminal output | In colour: any text with terminal colour codes keeps the colours it had |
| JSON | A tree you can fold, open two levels deep |
| JSON Lines (`.jsonl`, `.ndjson`) | A table, one row per line |
| [Claude Code and Pi sessions](/v1.0/file-types/agent-sessions) | The conversation: prompts, replies and one line per tool call |
| Markdown | A rendered document; frontmatter shows as a properties list |
| HTML | The page, running in a sandboxed frame |
| CSV and TSV | A table with sticky headers |
| SVG | An image, rendered in a sandbox |
| Images | A centred preview |
| Video and audio | A player that seeks by byte range |
| PDF | The browser's PDF viewer |
| Zips and folders | A [share page](/v1.0/file-types/folders) |
| [Scrawl](https://scrawl.kitlangton.com) captures | A [recording page](/v1.0/file-types/scrawl) |
| [Superwhisper](https://superwhisper.com) recordings | A [transcript page](/v1.0/file-types/superwhisper): audio on top, each line a timestamp that seeks it, speakers named |
| Anything else | A download page |

Markdown, HTML, CSV, SVG, JSON and JSON Lines have a **Source** view at `?view=source`. Every drop's raw bytes are at `/<slug>/<filename>`, with `?download=1` to force a download. Raw HTML and SVG are always served as plain text or in a sandbox, so a drop can never run script on your domain.

Most tools drop their colours when their output is piped. Ask for them to keep the colours in what you send:

```bash
FORCE_COLOR=1 npm test 2>&1 | jalco-drop -n test.log
```

The `...` button in the top-right holds every action for a file. Right-click anywhere for the same actions as a pie menu.

Every format lives in `src/formats/`, so you can [add your own](/v1.0/file-types/custom).