Data Mask Studio

Free plan Windows

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What Data Mask Studio is

Data Mask Studio is a free Windows desktop application for masking sensitive data in CSV files and local HTML content. Users can preserve, mask, or exclude columns, normalize values, rename or compose columns, and reuse profiles for batch processing. It supports individual or batch CSV masking and selective restoration. Deterministic tokens use keyed HMAC-SHA256 and configured prefixes, allowing repeated values to remain consistent across records and files. The app can also restore known codes in local HTML files and dashboards while retaining document markup. Original values and mappings reside in an authenticated encrypted local vault, which is needed for restoration; the maker says vault data uses AES-256-GCM and local keys use Windows DPAPI. Processing stays local, without telemetry or automatic synchronization of sensitive information. Other listed tools include bounded-memory streaming for large files, password-protected portable backups, vault audits, diagnostics, temporary-file cleanup, and controlled compaction. Releases provide a per-user Windows installer and portable ZIP. The app is GPL-3.0-only. Its executables are not digitally signed yet, and the maker does not guarantee irreversible anonymization.

Who it suits

It suits Windows users who need local CSV or HTML data masking and later selective restoration. Its reusable profiles and batch processing may suit recurring data-preparation workflows.

What it does well

Repeated values can remain consistent through deterministic tokens.
CSV data can be processed individually or in batches.
Local HTML codes can be restored while preserving markup.
Portable backups can be password-protected.

What to know first

The distribution targets Windows because it relies on Windows DPAPI.
The executables are not digitally signed yet.
Restoration requires access to the local vault.
The maker does not guarantee irreversible anonymization.

Limits

The app is free. Its distribution targets Windows; restoration requires the encrypted local vault, and there is no synchronization or remote key recovery.

Plans

Plan	Billed and limits	Price
Data Mask Studio	Open-source desktop app · GPL-3.0-only · Windows	Free

As gustavo-wallace.github.io lists them, read 7 Oct 2026. The maker's own page has the final word.

Getting started

Open the Data Mask Studio website.
Download a per-user Windows installer or portable ZIP from a release.
Run the application on Windows.
Choose columns to preserve, mask, or exclude, and configure data preparation or a reusable profile.
Process a CSV individually or in a batch, and use the local vault when restoration is needed.

Verdict

Data Mask Studio keeps masking and vault data local while offering selective restoration. Users should account for its Windows-only distribution and the maker’s stated limits on anonymization and executable signing.

Questions

How much does Data Mask Studio cost?

The listed plan is free. The app is open source under GPL-3.0-only.

Which platforms does it support?

It targets Windows because it relies on Windows DPAPI.

Can it restore masked data?

Yes. It can selectively restore CSV data and known codes in local HTML files. Restoration requires access to the encrypted local vault.

Does it process data locally?

Yes. Processing stays local, with no telemetry or automatic synchronization of sensitive information.

How can I download it?

Each release offers a per-user Windows installer and a portable ZIP package.

Does it guarantee irreversible anonymization?

No. The maker says the product does not guarantee irreversible anonymization.

Facts from Data Mask Studio's own pages

Backups and maintenance: Password-protected portable backups, vault integrity checks, diagnostics, temporary-file cleanup, and controlled compaction are available. · gustavo-wallace.github.io, 7 Oct 2026
Cryptography: The site says tokens use HMAC-SHA256, vault data uses AES-256-GCM, and local keys are protected with Windows DPAPI. · gustavo-wallace.github.io, 4 Oct 2026
CSV workflows: It supports individual and batch CSV masking, assisted column detection, and streaming processing for large files. · github.com, 7 Oct 2026
Data preparation: Users can preserve, mask, or exclude columns, normalize values, rename or compose columns, and reuse profiles for batch processing. · gustavo-wallace.github.io, 7 Oct 2026
Deterministic masking: It generates consistent tokens so repeated values can remain correlated across records and files. · gustavo-wallace.github.io, 4 Oct 2026
Deterministic tokens: Tokens use keyed HMAC-SHA256 and configured prefixes to keep repeated values consistent for analysis. · gustavo-wallace.github.io, 7 Oct 2026
Distribution: Each release provides a per-user Windows installer and a portable ZIP package. · github.com, 4 Oct 2026
Downloads: Each release offers a per-user Windows installer and a portable ZIP package. · github.com, 7 Oct 2026
Encrypted vault: Original representations and mappings are kept in an encrypted local vault, with restoration requiring access to that vault. · gustavo-wallace.github.io, 4 Oct 2026
Executable signing: The executables are not digitally signed yet, so Windows may display a SmartScreen warning. · github.com, 7 Oct 2026
HTML restoration: It can restore known codes in local HTML files and dashboards while preserving document markup. · gustavo-wallace.github.io, 4 Oct 2026
Large files: The README says processing uses bounded-memory streaming for large files. · github.com, 4 Oct 2026
License: The app is distributed under GNU General Public License v3.0 only, while third-party components retain their own licenses. · gustavo-wallace.github.io, 7 Oct 2026
Limitations: The distribution targets Windows because it relies on Windows DPAPI; it has no synchronization, telemetry, automatic updating, or remote key recovery. · github.com, 7 Oct 2026
Limits: The distribution targets Windows because it relies on Windows DPAPI; it has no synchronization, telemetry, automatic updating, or remote key recovery. · github.com, 4 Oct 2026
Privacy: Processing stays on the local machine, with no telemetry or automatic synchronization of sensitive information. · gustavo-wallace.github.io, 7 Oct 2026
Purpose: Data Mask Studio is a local-first Windows desktop app for preparing and masking sensitive datasets while preserving correlations between repeated values. · gustavo-wallace.github.io, 7 Oct 2026
Restoration: The app can restore selected CSV data and known codes in local HTML files while preserving document markup. · gustavo-wallace.github.io, 7 Oct 2026
Security caveat: The maker says the product does not guarantee irreversible anonymization, and the executables are not digitally signed yet. · gustavo-wallace.github.io, 4 Oct 2026
Vault security: Original information is stored in an authenticated AES-256-GCM encrypted local vault, with local keys protected by Windows DPAPI. · gustavo-wallace.github.io, 7 Oct 2026

Where Data Mask Studio stands on Freedom251

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