---
title: ".part file — what it is and how to open it"
description: "A .part file is a Partial Download. An incomplete download from Firefox or a download manager. How to open one on Windows, macOS and Linux, and what to convert it to."
url: https://atoneplace.net/file/part/
site: "At One Place"
---

# .part files

**.part file: Partial Download**

An incomplete download from Firefox or a download manager.

## What opens a .part file

- **Windows:** Resume the download in Firefox or your download manager
- **macOS:** Resume the download in Firefox or your download manager
- **Linux:** Resume the download in Firefox or your download manager

## What a .part file is

Firefox writes a .part file while fetching, alongside a small .part file entry in its downloads database, and renames it on completion. A stranded .part means the transfer never finished. Restart the download rather than renaming the file; the same convention is used by aria2, JDownloader and various torrent clients.

## Details

- **Extension:** .part
- **Full name:** Partial Download
- **Category:** Data
- **Created by:** Mozilla and others
- **Format:** Binary

## Common questions

### How do I open a .part file?

On Windows use Resume the download in Firefox or your download manager; on macOS use Resume the download in Firefox or your download manager; on Linux use Resume the download in Firefox or your download manager. An incomplete download from Firefox or a download manager.

### What is a .part file?

Partial Download. Firefox writes a .part file while fetching, alongside a small .part file entry in its downloads database, and renames it on completion. A stranded .part means the transfer never finished.

## Related pages

- [.csv — Comma-Separated Values](https://atoneplace.net/file/csv/)
- [.json — JavaScript Object Notation](https://atoneplace.net/file/json/)
- [.xml — Extensible Markup Language](https://atoneplace.net/file/xml/)
- [.yaml — YAML Data File](https://atoneplace.net/file/yaml/)
- [.log — Log File](https://atoneplace.net/file/log/)
- [.torrent — BitTorrent Metainfo File](https://atoneplace.net/file/torrent/)
- [.dat — Generic Data File](https://atoneplace.net/file/dat/)
- [.vcf — vCard Contact File](https://atoneplace.net/file/vcf/)
- [.sql — SQL Script](https://atoneplace.net/file/sql/)
- [.ics — iCalendar Event](https://atoneplace.net/file/ics/)
- [.sqlite — SQLite Database](https://atoneplace.net/file/sqlite/)
- [.db — Generic Database File](https://atoneplace.net/file/db/)

## Sources

- Media Types Registry — IANA (https://www.iana.org/assignments/media-types/)
- Official vendor product documentation — At One Place (/about/)