Cyber Security on a Budget: Free Tools for SMEs

Good Security Does Not Require a Big Budget

One of the most persistent myths in cyber security is that protecting your business requires expensive enterprise software and a dedicated security team. For Australian SMEs, this simply is not true. Many of the most effective security tools are completely free, and the paid options that matter most often cost less than a daily coffee.

The ASD’s Annual Cyber Threat Report 2023–2024 found that the majority of successful attacks against small businesses exploited basic security gaps — weak passwords, missing patches, lack of multi-factor authentication — that free tools can address. This guide walks you through the best free and freemium tools available right now.

Password Management

Bitwarden (Free Tier)

Reusing passwords across accounts is one of the most common security risks for small businesses. Bitwarden is an open-source password manager that generates, stores and auto-fills strong, unique passwords for every account.

• What it does: Stores all your passwords in an encrypted vault. Generates random, complex passwords. Auto-fills login forms across browsers and devices.
• Why it matters: The ACSC reports that credential theft is a leading attack vector. A password manager eliminates password reuse — the single biggest vulnerability in most SMEs.
• Getting started: Sign up at bitwarden.com, install the browser extension, and import any passwords currently saved in your browser. The free tier supports unlimited passwords on unlimited devices for one user. Teams plans start at a few dollars per user per month.

Multi-Factor Authentication

Microsoft Authenticator / Google Authenticator (Free)

Multi-factor authentication (MFA) is arguably the single most impactful security measure a business can implement. These free apps generate time-based one-time codes that serve as a second layer of verification beyond your password.

• What they do: Generate a six-digit code that changes every 30 seconds. You enter this code after your password to prove it is really you.
• Why it matters: Microsoft reports that MFA blocks over 99.9% of automated account compromise attacks. It is the highest-impact, lowest-cost security control available.
• Getting started: Install either app from your phone’s app store, then enable MFA on your email, banking, cloud services and social media accounts. Our MFA setup guide walks you through the process step by step for common business platforms.

Email Security Checks

MXToolbox (Free)

Your business email domain may be vulnerable to spoofing without you knowing it. MXToolbox provides free DNS and email diagnostics that check whether your domain has proper SPF, DKIM and DMARC records configured.

• What it does: Analyses your domain’s email authentication records and identifies misconfigurations. Also checks whether your mail server is on any blacklists.
• Why it matters: Without proper email authentication, attackers can send emails that appear to come from your domain — tricking your customers, suppliers and staff.
• Getting started: Visit mxtoolbox.com and enter your domain name in the lookup tool. For a full explanation of what SPF, DKIM and DMARC are and how to set them up, read our email authentication guide.

mail-tester.com (Free)

This simple tool lets you send a test email and receive a detailed report on your email configuration, including authentication, content and deliverability. It is an easy way to verify that your DMARC setup is working correctly.

Vulnerability and SSL Scanning

Qualys SSL Labs (Free)

If your business has a website, you need to ensure your SSL/TLS certificate is properly configured. Qualys SSL Labs provides a free, detailed analysis of your web server’s SSL configuration.

• What it does: Tests your website’s HTTPS configuration and assigns a grade from A+ to F. Identifies weak ciphers, expired certificates and known vulnerabilities.
• Why it matters: A poorly configured SSL certificate can expose customer data in transit and damage your search engine rankings. Google penalises sites without valid HTTPS.
• Getting started: Go to ssllabs.com/ssltest and enter your website URL. Aim for an A or A+ grade.

Shodan (Free Tier)

Shodan is a search engine for internet-connected devices. The free tier allows you to see what devices and services associated with your business are visible from the internet — including anything that should not be.

• What it does: Scans for open ports, exposed services and known vulnerabilities on your public IP addresses.
• Why it matters: If a database, remote desktop service or IoT device is accidentally exposed to the internet, attackers will find it. Shodan lets you find it first.
• Getting started: Create a free account at shodan.io and search for your business’s public IP address or domain name.

Antivirus and Endpoint Protection

Microsoft Defender (Built-in)

If your business uses Windows 10 or 11, you already have a capable antivirus solution built in. Microsoft Defender has evolved significantly and now consistently ranks among the top antivirus products in independent testing.

• What it does: Real-time malware protection, cloud-based threat intelligence, ransomware protection (controlled folder access), firewall and network protection.
• Why it matters: You do not need to pay for a third-party antivirus product. Defender is already on your machines — you just need to make sure it is enabled and up to date.
• Getting started: Open Windows Security settings and verify that all protection features are enabled. Turn on “Controlled folder access” for ransomware protection.

Backup Solutions

Cloud Storage Sync (OneDrive / Google Drive — Free Tiers)

Both Microsoft OneDrive (5 GB free) and Google Drive (15 GB free) provide basic cloud backup for critical files. While the free tiers are limited in storage, they can protect your most important documents at zero cost.

• What they do: Automatically sync selected folders to the cloud, providing an offsite copy of your data.
• Why it matters: If your computer is stolen, damaged or encrypted by ransomware, you can recover your files from the cloud. This is one component of the 3-2-1 backup strategy.
• Getting started: Install the sync client and configure it to sync your most critical business documents. For a more robust backup strategy, combine cloud sync with a separate offline backup.

Security Assessment

HMC CYBER9 Assessment (Free)

Before you deploy any tools, it helps to know where your gaps actually are. The CYBER9 assessment from How’s My Cyber is a free tool that scores your business across nine critical security domains in under 10 minutes — no technical knowledge required. It is built on the IDIA framework (Identity, Data, Infrastructure, Assurance), which organises every cybersecurity control into four clear pillars. This means your CYBER9 results tell you not just what to fix, but which pillar each tool addresses — so you can prioritise the free tools listed above based on where they will have the greatest impact.

Government Resources

ACSC Small Business Guide and Tools (Free)

The Australian Cyber Security Centre (ACSC) provides an excellent suite of free resources specifically designed for small businesses:

• Small Business Cyber Security Guide — a step-by-step guide covering the most important actions.
• Essential Eight Assessment Tool — helps you evaluate your current maturity level against the Essential Eight.
• Cyber Security Alerts — subscribe to email alerts about new threats and vulnerabilities relevant to Australian businesses.
• ReportCyber — report cybercrime incidents and receive guidance on next steps.

“The most expensive security tool is the one you buy but never implement. Free tools that you actually use will always beat paid tools gathering dust.”

Putting It All Together

Here is a suggested priority order for implementing these free tools:

1. Password manager (Bitwarden) — eliminates the most common vulnerability.
2. MFA (Authenticator app) — blocks the vast majority of account compromise attacks.
3. Antivirus check (Microsoft Defender) — verify it is enabled and current.
4. Email authentication check (MXToolbox) — find out if your domain can be spoofed.
5. SSL scan (Qualys SSL Labs) — verify your website is properly secured.
6. Backup setup (OneDrive/Google Drive) — protect your most critical files.

For a broader view of where to begin your security journey, see our guide on cyber security for business owners.

Benchmark Your Security for Free

Tools are only part of the picture. Platforms like How’s My Cyber use the IDIA framework (Identity, Data, Infrastructure, Assurance) to organise every control into a clear operating model that works alongside any standard — so you always know which pillar each tool strengthens. Start with the free CYBER9 assessment to benchmark your business across nine critical domains in under 10 minutes. You will receive a maturity score and a prioritised action plan that tells you exactly where to focus your efforts next — no cost, no technical knowledge required.