---
title: "Understanding Signal Message Sync After Reinstall"
slug: "q-i-see-some-messages-on-my-signal-desktop-but-i"
updated: 2026-06-12T07:32:04Z
published: 2026-06-12T07:32:04Z
canonical: "docs.smarsh.com/q-i-see-some-messages-on-my-signal-desktop-but-i"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.smarsh.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Understanding Signal Message Sync After Reinstall

This topic explains how message synchronization works between the Signal mobile app (CM for SGNL) and the Signal desktop app after a period of inactivity or reinstalling the mobile app.

- The mobile device is the *primary device* and source of encryption keys.
- Desktop devices are *linked devices* that sync messages from the mobile device.
- Messages are not synced from desktop back to mobile.

### Standard Sync Behavior

- Signal desktop can remain linked and functional even if the mobile app is not opened regularly.
- A linked desktop can continue working for up to 30 days of mobile inactivity.
- Messages sent or received on Desktop during this period remain available only on the desktop until they are synced to mobile.
- Opening the mobile app within this window allows messages to sync normally.

**Best practice**

Open the Signal mobile application on a daily basis or more often to prevent any synchronization issues.

### Updating the Mobile App

- A standard Signal app update does not break the desktop link.
- If messages are missing after an update, this may indicate a bug in the Signal app.

### Reinstalling the Signal Mobile App

Reinstalling the Signal mobile app breaks the existing link between the mobile device and all linked desktops.

This happens because:

- The mobile app generates new encryption keys during reinstall.
- Previously linked desktop sessions are permanently disconnected.
- Messages that exist only on the desktop and were not synced to the mobile app:
  - Will not sync after reinstall
  - Will not reappear on the mobile app
  - Will not transfer to a newly linked desktop

> [!WARNING]
> **Warning**
> 
> Once the link is broken, desktop‑only messages are at risk of permanent loss unless manually preserved.

### Re‑Linking Desktop After Reinstall

Before you close the old desktop session or re‑link:

1. **Document missing messages**
  - Take photos or a short video of the messages on the desktop.
2. **Archive them into Signal**
  - Send the images/videos into Signal (preferably into the original chat).
  - This preserves message context and contact metadata.

Only after this documentation is complete should you re‑link the desktop.

When you re‑link Signal desktop to a freshly installed mobile app:

- A new desktop session is created.
- Sync direction is mobile to desktop only.
- The desktop will sync up to 45 days of message history from the mobile app.

> **Important**
> 
> - The 45‑day sync window applies only to messages already on the mobile app.
> - It does not recover:
>   - Messages that existed only on the old desktop
>   - Messages sent during the period when mobile was uninstalled

#### Example Scenario

**Scenario**

A user sends and receives messages on Signal Desktop for 3 days without opening the mobile app, then reinstalls the mobile app.

**Result**

- The desktop link is broken.
- Messages from those 3 days:
  - Will **not** sync to the mobile app
  - Will **not** appear after re‑linking
- After re‑linking:
  - New messages sync normally going forward
  - Up to 45 days of *existing mobile messages* sync to the new desktop

### Summary of Sync

| Scenario | Will Messages Sync? |
| --- | --- |
| Desktop inactive < 30 days | Yes |
| Mobile app updated | Yes |
| Mobile app reinstalled | No (link breaks) |
| Re‑link after reinstall (mobile → desktop) | Up to 45 days |
| Desktop to mobile recovery after reinstall | Not possible |

### Best Practice for Signal Capture Users

- Open the CM for SGNL mobile app daily.
- Avoid long sync gaps between desktop and mobile.
- Do not reinstall the mobile app without first verifying message sync.
- Preserve desktop‑only messages before re‑linking.