Desktop messaging apps download every photo anyone sends you
Three clients, three storage models, and one of them has no cloud copy to restore from. What each keeps on a PC.
Desktop messaging clients are full devices rather than windows onto your phone, which means everything sent to you after linking is downloaded and kept.
Where each one stores
Get-ChildItem "$env:APPDATA\WhatsApp","$env:APPDATA\Telegram Desktop","$env:APPDATA\Signal","$env:LOCALAPPDATA\Packages\*WhatsApp*" -EA SilentlyContinue |
ForEach-Object {
$s = (Get-ChildItem $_.FullName -Recurse -Force -File -EA SilentlyContinue | Measure-Object Length -Sum).Sum
[PSCustomObject]@{ MB = [math]::Round($s/1MB); Path = $_.FullName }
} | Sort-Object MB -DescendingThe three models, and why they matter
| App | Where the messages live | Clearing locally |
|---|---|---|
| On your phone, synced | Costs a relink and a resync | |
| Telegram | On Telegram's servers | Costs a redownload, nothing else |
| Signal | Only on this PC | Permanent. There is no server copy |
Telegram has the control the others do not
Settings, Advanced, Data and Storage has both a maximum cache size and a keep media duration. Setting either turns an unbounded folder into a bounded one, which is better than clearing it every few months. It is the one setting on this page worth changing immediately.
Signal is the exception to be careful with
Signal Desktop keeps its own encrypted database and there is no cloud backup by design. Removing the folder loses the message history that exists only on that PC. Set a retention period in its settings instead, which removes old messages and their attachments on a schedule.
WhatsApp downloads everything automatically
Media in group chats downloads as it arrives whether or not you open the conversation, which is why the number of groups matters more than how much you use it. The app's own storage screen lists conversations by size and removes media per chat, keeping the messages.
The same three apps behave identically on the other platform, covered in WhatsApp and Telegram.
Common questions
Where does WhatsApp Desktop store media on Windows?
In its AppData folder, or under %LOCALAPPDATA%\Packages for the Store version. Media in group chats downloads automatically as it arrives, so the number of groups drives the size.
How do I limit Telegram's cache on Windows?
Settings, Advanced, Data and Storage has both a maximum cache size and a keep media duration. Setting either bounds the folder permanently rather than needing a clear every few months.
Is it safe to delete Signal Desktop's folder?
It permanently removes your desktop message history, because Signal keeps no server side copy by design. Set a retention period in its settings instead.
Which messaging app uses the most space on a PC?
Usually whichever is in the most group chats, because group media downloads automatically. Telegram grows fastest with channel subscriptions and is also the easiest to cap.