Data Mask Studio

Windows

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Freedom report

One barScore 5.3

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Data Mask Studio is ranked #11 of 22 in data masking software on Freedom251. It runs on Windows.

Compared on data masking software

Free plan: Yes
Masking methods: static

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The record

Purpose: Data Mask Studio is a Windows desktop application for masking sensitive data in CSV files and local HTML content.
Deterministic masking: It generates consistent tokens so repeated values can remain correlated across records and files.
CSV workflows: It supports column selection, individual or batch CSV masking, and selective restoration.
HTML restoration: It can restore known codes in local HTML files and dashboards while preserving document markup.
Encrypted vault: Original representations and mappings are kept in an encrypted local vault, with restoration requiring access to that vault.
Cryptography: The site says tokens use HMAC-SHA256, vault data uses AES-256-GCM, and local keys are protected with Windows DPAPI.
Privacy: Processing stays local, with no telemetry or automatic synchronization of sensitive information.
Backups and maintenance: It supports password-protected portable backups, vault integrity auditing, diagnostics, temporary-file cleanup, and controlled vault compaction.
Large files: The README says processing uses bounded-memory streaming for large files.
Distribution: Each release provides a per-user Windows installer and a portable ZIP package.
Limits: The distribution targets Windows because it relies on Windows DPAPI; it has no synchronization, telemetry, automatic updating, or remote key recovery.
Security caveat: The maker says the product does not guarantee irreversible anonymization, and the executables are not digitally signed yet.
License: Data Mask Studio is distributed under the GNU General Public License v3.0 only.

Where it ranks on Freedom251

Best Data Masking Software in 2026#11 of 22

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Sources

gustavo-wallace.github.io/data-mask-studio/· checked 4 Oct 2026
github.com/Gustavo-Wallace/data-mask-studio/blob/m· checked 4 Oct 2026