Good day, and thank you for standing by. Welcome to the Zscaler First Quarter 2025 earnings call. At this time, all participants are in a listen-only mode. After the speaker's presentation, there will be a question-and-answer session. To ask a question during the session, you will need to press star one one on your telephone. You will then hear an automated message advising your hand is raised. To withdraw your question, please press star one one again. Please be advised that today's conference is being recorded. I will now hand the conference over to your speaker today, Ashwin Kesireddy, Vice President, Investor Relations and Strategic Finance. Please go ahead.
Good afternoon, everyone, and welcome to the Zscaler First Quarter Fiscal Year 2025 earnings conference call. On the call with me today are Jay Chaudhry, Chairman and CEO, Remo Canessa, CFO. Please note we have posted our earnings release and a supplemental financial schedule to our Investor Relations website. Unless otherwise noted, all numbers we talk about today will be on an adjusted non-GAAP basis. You will find the reconciliation of GAAP to the non-GAAP financial measures in our earnings release. I'd like to remind you that today's discussion will contain forward-looking statements, including but not limited to the company's anticipated future revenue, calculated billings, operating performance, gross margin, operating expenses, operating income, net income, free cash flow, dollar-based net retention rate, future hiring decisions, remaining performance obligations, income taxes, earnings per share, our objectives and outlook, our customer response to our products, and our market share and market opportunity.
These statements and other comments are not guarantees of future performance, but rather are subject to risk and uncertainty, some of which are beyond our control. These forward-looking statements apply as of today, and you should not rely on them as representing our views in the future. We undertake no obligation to update these statements after this call. For a more complete discussion of the risks and uncertainties, please see our filings with the SEC, as well as in today's earnings release. I also want to inform you that we'll be attending the following conferences: UBS Global Technology and AI Conference in Scottsdale on December 4th, Scotiabank Global Technology Conference in San Francisco on December 10th, Barclays Global Technology Conference in San Francisco on December 11th, and Needham Growth Conference on January 9th and 10th. Now, I'll turn the call over to Jay.
Thank you, Ashwin. We delivered a strong Q1 with all metrics once again exceeding the high end of our guidance. Revenue grew 26% year- over- year, and bookings growth accelerated to over 30%, driven by increasing customer commitments to our Zero Trust Exchange platform and growing interest in our AI solutions. Our billings growth of 13% far exceeded the recent average growth rate of publicly traded legacy network security vendors by over 10 percentage points, demonstrating our continued market share gains in cybersecurity. We are making tremendous progress executing on our go-to-market plans and driving innovations that our customers are relying on us for. With continued strong demand, I'm very pleased to increase our full-year billings and revenue guidance. Q1 was a solid quarter for profitability as well.
With our operating discipline, we grew operating profit by 50% year-over-year and delivered new Q1 records for operating margin of 21% and free cash flow margin of 46%. While many successful SaaS companies strive for Rule of 40 results, our revenue growth and free cash flow margin makes us a rare SaaS company that operates at Rule of 70 or better. This places us in the top handful of the 145 largest public SaaS companies. In my scores of customer conversations, CXOs are prioritizing Zero Trust Security and AI for their IT spending. We are fighting AI with AI. We recently delivered several AI innovations and are continuing to expand our AI portfolio in the following three areas of high customer interest. First, securing use of AI applications for faster and safer adoption of public and private AI applications.
We enable customers to securely adopt public AI apps such as ChatGPT, Microsoft Copilot, and GitHub Copilot with Zscaler for Copilots. Zscaler for Copilots provides granular visibility to find and classify on-prem or cloud data, gives access control for only the right users to access data, limits Copilot's discovery of data, fixes Copilot misconfigurations, and enforces policies to stop sensitive data from leaking. Our industry-leading capabilities in this area are driving large customer wins. For example, in a new logo win, a Global 2000 Technology Services customer purchased our AI-powered data protection solution, which accounted for 50% of the seven-figure ACV deal. Data protection enables this customer to securely roll out Microsoft Copilot. The secure use of Office 365 was a huge opportunity for us, and I believe the secure use of Microsoft Copilot is a huge opportunity as well.
In addition to enabling secure adoption of Copilots, we provide visibility and control into public AI apps used by employees, score the risk level of AI apps, and store prompt queries for logging or auditing purposes. With the widespread adoption of public AI apps, we are seeing growing demand for their security. Our innovations are expanding beyond securing public AI apps to customers' private AI apps, including chatbots, LLM, and SLM models, and inference engines. We are expanding the functionality of our inline proxy-based Zero Trust Exchange with an LLM proxy to analyze prompt queries and results, to detect and prevent prompt injections and other malicious activities. Second, AI-powered automated digital experience for operational efficiency and faster resolution of end-to-end user performance issues. Our already available automated digital experience products, including ZDX Copilot, are contributing to large deal wins.
For example, in a seven-figure ACV upsell deal, a large healthcare provider doubled their ZIA subscription to 60,000 seats and purchased ZDX Advanced Plus, which includes ZDX Copilot for all 60,000 seats. This customer plans to use ZDX Copilot to automate IT operations and reduce resolution time for service tickets. With this deal, this customer's annual spend more than doubled with us. We are taking ZDX Copilot to the next level with ZDX AI Agent to automate root cause analysis, resulting in further reduction in resolution time and provide automated recommendations to fix user performance issues. Third, AI-powered security products are better cyber and data protection and SecOps automation. We have delivered several AI-powered innovations for data and cyber protection, such as automated data classification, GenAI-based image classification, zero-day vulnerability detection and prevention, AI-powered app segmentation, and ML-based IoT OT device discovery.