01
Text
Paste it in, mask it, copy it out.
Desktop app · macOS and Linux, Windows coming
Text, files, and the agents that read them.
Velum masks what you paste, the documents and folders you drop on it, and the files a coding agent reads on your behalf. Detection runs on your machine, against the full model rather than a cut-down one. Available for macOS and Linux today, with Windows coming.
Seven days free. No account, no card.
synthetic
.masked.md beside the original. The original is never touched and nothing is uploaded.1 / 2
What it masks.
02
Files and folders
Drop a document, or a whole directory.
03
Permanent redaction
For when the bar has to be in the pixels.
04
Audit
What is already on your disk.
- ~0%
- Measured on 1,800 labelled spans across nine languages. High, the shipped default, sits at about 2%.
- Before
- In Claude Code the hooks mask what the agent reads and restore the originals before a write reaches disk. No cooperation from the model required.
- 5
- An update check, an optional model download, a revocation list, one activation report and one trial registration. The masking path itself never needs the network.
Residual leak at Maximum
Your agent reads it
Outbound calls, none carrying your text
Windows · coming soon
Windows is on the way.
The same masking engine as the macOS and Linux apps, running on your own machine. Leave an address and we will tell you the day it is available to download.
Request a demo
See it work on your own data.
Tell us what you work with and we will walk you through it on a call, on your own files. Nothing leaves your machine while we do.
Your address is used to reply to you, and for nothing else.