Hush
Effective date: 1 January 2026 · Last updated: 1 January 2026
The short version: You may install and use the Hush extension free of charge for personal or commercial work. The tool is provided as-is. Don't use it to break laws, infringe on other people's rights, or pretend our software is yours. We may update these terms; the new version will always be at this URL.
1. Acceptance of these terms
By installing, enabling, or using the Hush browser extension ("Hush", the "extension", "we", "us"), you agree to these Terms of Service. If you do not agree, please uninstall the extension. The extension is published by Four Line ("we", "us", "our") via the Chrome Web Store.
2. Licence to use Hush
Subject to your compliance with these terms, we grant you a personal, worldwide, royalty-free, non-exclusive, non-transferable, revocable licence to install and use Hush for any lawful purpose, personal or commercial. You do not need a paid subscription. Where the source code is published, it may be subject to a separate open-source licence; the terms of that licence apply to the source code itself in addition to these terms applying to the distributed extension.
3. Acceptable use
Hush is a tool for redacting, annotating, and exporting parts of web pages you are otherwise authorised to view. Common acceptable uses include:
Hiding sensitive client information before sharing a screenshot in a support ticket, bug report, or marketing material.
Producing demos and tutorials with realistic-looking but de-identified data.
Producing assets for design, documentation, or pitch decks from sources you control or have permission to use.
Saving annotated walkthroughs of a flow you own or have permission to capture.
4. Things you must not do
You must not use Hush to, or attempt to:
Violate any applicable law or regulation, including privacy, data-protection, copyright, trademark, or anti-fraud laws.
Falsify, forge, or alter screenshots in a way that misrepresents another person, organisation, or fact — including but not limited to creating deceptive evidence, fake transaction confirmations, fake credentials, or fraudulent communications.
Capture or share information you have no right to view or distribute (for example, content behind another person's authentication).
Interfere with the operation of the extension, attempt to bypass its security boundaries, or run modified copies that impersonate Hush in the Chrome Web Store or elsewhere.
Reverse engineer, decompile, or disassemble portions of the extension that are not made available under an open-source licence, except to the extent expressly permitted by applicable law.
Resell, sub-license, or distribute the extension as your own product, or remove or obscure attribution to Four Line.
Use the extension as a component of malware, spyware, ad-injection software, or any product that surveils end users.
5. Your screenshots and content
Hush operates entirely on your device. We do not receive, store, or process any of the page content, redactions, exports, or annotations you create. Anything Hush produces — every PNG, SVG, copied clipboard payload, watermarked image, saved template — is yours.
You are solely responsible for what you do with those outputs, including ensuring you have the necessary rights to capture, redact, share, or publish the underlying content.
6. Third-party sites and services
Hush runs inside web pages you visit; it does not endorse or take responsibility for the content of those sites. The brand badge in the toolbar links to fourline.ai; following that link is governed by the policies of that site. The extension bundles open-source libraries listed in our Privacy Policy, each subject to its own licence.
7. Updates and availability
We may release updates to Hush via the Chrome Web Store at any time. Chrome typically auto-installs extension updates; you may manage this in your browser settings. We may also discontinue, suspend, or modify any feature of Hush at any time, with or without notice. We aim for a high quality bar but do not guarantee uninterrupted availability.
8. Disclaimer of warranties
HUSH IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, OR NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE EXTENSION WILL BE ERROR-FREE, THAT ITS REDACTION OR EXPORT FUNCTIONS WILL DETECT EVERY POSSIBLE INSTANCE OF SENSITIVE DATA, OR THAT IT WILL OPERATE WITHOUT INTERRUPTION OR LOSS. YOU REMAIN RESPONSIBLE FOR REVIEWING ANY OUTPUT BEFORE SHARING IT.
In particular, the Smart Redact pattern engine uses regular expressions and heuristics. It is intended as a productivity aid, not a guarantee. Always visually verify exports before publishing them.
9. Limitation of liability
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, FOUR LINE AND ITS AFFILIATES, OFFICERS, EMPLOYEES, AND CONTRIBUTORS WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY, OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF PROFITS, REVENUE, DATA, GOODWILL, OR BUSINESS, ARISING OUT OF OR IN CONNECTION WITH YOUR USE OF (OR INABILITY TO USE) HUSH, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. IN NO EVENT WILL OUR AGGREGATE LIABILITY ARISING FROM OR RELATED TO HUSH EXCEED ONE HUNDRED US DOLLARS (US $100), OR THE AMOUNT YOU PAID US FOR HUSH IN THE TWELVE MONTHS PRECEDING THE EVENT GIVING RISE TO THE CLAIM, WHICHEVER IS GREATER.
Nothing in these terms excludes or limits liability that cannot be excluded or limited under applicable law.
10. Indemnification
You agree to defend, indemnify, and hold harmless Four Line from any claim, demand, loss, or damages, including reasonable legal fees, arising from (a) your misuse of Hush, (b) your violation of these terms, or (c) your violation of any applicable law or third-party right in connection with your use of the extension.
11. Termination
You may stop using Hush at any time by uninstalling it from your browser. We may terminate or suspend your right to use Hush if you breach these terms. Sections that by their nature should survive termination (including disclaimers, limitations of liability, indemnification, governing law) will survive.
12. Governing law
These terms are governed by the laws of the jurisdiction in which Four Line is established, without regard to its conflict-of-laws rules. Any dispute arising from these terms or your use of Hush will be resolved in the competent courts of that jurisdiction, except where mandatory consumer-protection law in your country of residence grants you the right to bring proceedings locally.
13. Changes to these terms
We may update these terms from time to time. The "Last updated" date at the top of this page reflects the most recent changes. If we make material changes that affect your rights, we will publish the updated terms at this URL and, where reasonably practicable, surface a notice in the extension before the new terms take effect. Continued use of Hush after the effective date of an update constitutes acceptance of the updated terms.
14. How to reach us
For questions about these terms, write to hello@fourline.ai. For privacy-specific questions, see the Privacy Policy.