Google Ads Scripts Guide: Automate Your Campaigns in 2026

Google Ads Scripts Guide: Automate Your Campaigns in 2026

What Are Google Ads Scripts

Google Ads scripts are snippets of JavaScript code that run within the Google Ads platform to automate campaign management tasks. They can read your account data, make changes to campaigns, send emails, write to Google Sheets, and interact with external APIs — all without any third-party tools or additional software.

For advertisers in Singapore managing campaigns with tight margins and competitive CPCs, scripts can be the difference between a well-optimised account and one that bleeds budget on weekends, after hours, or during underperforming periods that no one notices until the monthly review.

Scripts occupy a middle ground between manual management and full automation platforms. They are more powerful and flexible than automated rules (which are limited to predefined conditions and actions) but less complex than building integrations through the Google Ads API. For most advertisers and agencies, scripts provide the best balance of power and accessibility.

Common use cases for Google Ads scripts include:

• Budget pacing: Automatically adjusting daily budgets to ensure monthly spend targets are met without overspending or underspending.
• Bid adjustments: Modifying bids based on performance data, weather conditions, stock levels, or other external factors.
• Automated reporting: Generating custom reports and sending them to stakeholders on a scheduled basis.
• Account monitoring: Sending alerts when key metrics fall outside acceptable ranges — broken landing pages, sudden spend spikes, or conversion tracking failures.
• Bulk changes: Making large-scale changes across campaigns, ad groups, or keywords that would take hours to do manually.

You do not need to be a professional developer to use Google Ads scripts. A basic understanding of JavaScript helps, but many useful scripts are available as templates that require minimal modification. The Google Ads scripts documentation is comprehensive, and the community has published thousands of ready-to-use scripts.

Getting Started with Google Ads Scripts

To access the scripts editor, navigate to Tools and Settings in your Google Ads account, then select Scripts under Bulk Actions. You will see an editor where you can write, test, and schedule scripts.

The scripts editor:

The built-in editor provides syntax highlighting, autocomplete for Google Ads-specific functions, and a preview mode that lets you test scripts without making actual changes to your account. Always use preview mode first — running an untested script on a live account can cause unintended changes that are difficult to reverse.

Understanding the basic structure:

Every Google Ads script requires a main() function as its entry point. This is the function that Google Ads calls when the script runs. Within main(), you use Google Ads-specific objects and methods to interact with your account data.

A simple script that logs your account’s total spend for the current month would look like this: define a main() function, use AdsApp.currentAccount().getStatsFor() to retrieve the current month’s stats, then use Logger.log() to output the cost. This basic pattern — retrieve data, process it, take action — is the foundation of every Google Ads script.

Key objects you will use:

• AdsApp: The root object that provides access to all account entities — campaigns, ad groups, keywords, ads, and more.
• Selectors and iterators: Used to filter and loop through account entities. For example, AdsApp.campaigns().withCondition() lets you filter campaigns by name, status, or performance metrics.
• Stats objects: Provide performance data like impressions, clicks, cost, conversions, and conversion value for any entity over a specified date range.
• UrlFetchApp: Enables HTTP requests to external services, allowing scripts to interact with APIs, webhooks, and external data sources.
• SpreadsheetApp: Provides read/write access to Google Sheets, which is commonly used for reporting output, configuration data, and logging.

Scheduling scripts:

Scripts can be scheduled to run at regular intervals — hourly, daily, weekly, or monthly. The scheduling interface lets you set the frequency and time. For Singapore-based campaigns, ensure your script schedule accounts for the SGT timezone (GMT+8), as Google Ads defaults to the account’s timezone setting.

Start with simple scripts that perform read-only operations — pulling data and generating reports. Once you are comfortable with the scripting environment, progress to scripts that make changes to your account.

Budget Management Scripts

Budget management is one of the most impactful applications of Google Ads scripts, particularly for agencies managing multiple client accounts in Singapore where budgets are tightly controlled.

Monthly budget pacing:

The most common budget script monitors monthly spend against a target and adjusts daily budgets to ensure the monthly target is met. The logic works as follows: calculate the remaining budget for the month, divide it by the remaining days, and set the daily budget accordingly. This prevents the common problem of overspending in the first half of the month and running out of budget before month-end.

A well-designed pacing script accounts for weekday versus weekend performance differences. If your campaigns perform significantly better on weekdays, the script can allocate a higher proportion of the remaining budget to weekdays and reduce weekend spend accordingly.

Budget alerts:

Set up scripts that alert you when campaigns are on track to exceed their monthly budget or when spend is significantly behind pace. The script calculates the expected spend based on the current run rate and compares it against the monthly target. If the variance exceeds a threshold you define — say 10% over or 20% under — the script sends an email alert.

This is particularly valuable for PPC management teams overseeing multiple accounts. Instead of manually checking budget pacing across every account daily, a single script can monitor all accounts and alert you only when intervention is needed.

Dayparting budgets:

If your campaigns perform significantly better during certain hours — for example, if your Singapore B2B campaigns convert primarily during business hours — a script can increase budgets during high-converting hours and decrease them during off-peak periods. This is more granular than Google Ads’ built-in ad schedule bid adjustments and can be customised to your specific performance patterns.

Shared budget monitoring:

Google Ads shared budgets distribute spend across multiple campaigns, but they do not offer the same granularity of control as individual campaign budgets. A script can monitor campaigns using shared budgets and alert you when one campaign is consuming a disproportionate share of the budget, starving other campaigns of spend.

Budget management scripts are typically the first scripts that PPC managers implement because the impact is immediate and measurable. Preventing even one instance of budget overspend or ensuring budget is fully utilised every month can justify the time invested in setting up the script.

Bid Adjustment Scripts

While Smart Bidding handles most bid optimisation, there are scenarios where custom bid adjustment scripts provide value that automated bidding cannot.

Device-based bid adjustments:

A script can analyse conversion performance by device (desktop, mobile, tablet) and automatically set device bid adjustments based on conversion rate differences. If mobile conversions cost 40% more than desktop, the script can set an appropriate negative bid adjustment for mobile traffic. This works alongside Smart Bidding or can be used with manual bidding strategies.

Geographic bid adjustments:

For businesses serving specific areas within Singapore, scripts can analyse performance by location and adjust bids accordingly. If your campaigns perform significantly better in certain planning areas or postal districts, a script can increase bids for those locations and decrease bids for underperforming areas.

Weather-based bid adjustments:

Using an external weather API, scripts can adjust bids based on weather conditions. This is relevant for industries where demand correlates with weather — air conditioning services during hot spells, indoor entertainment during rainy periods, or food delivery during storms. The script fetches current or forecasted weather data for Singapore and adjusts campaign bids or budgets accordingly.

Competitor-aware bid adjustments:

Scripts can monitor your auction insights data and adjust bids when specific competitors increase or decrease their presence. If a key competitor’s impression share drops significantly (suggesting they have paused campaigns or reduced budgets), the script can increase your bids to capture additional traffic at a potentially lower CPC.

Inventory-based bid adjustments:

For e-commerce advertisers, scripts can connect to your inventory system and pause or reduce bids for products that are out of stock, and increase bids for products with healthy inventory levels. This prevents wasting ad spend on clicks that cannot convert due to stock issues.

When implementing bid adjustment scripts, always include safeguards. Set maximum and minimum bid limits to prevent extreme adjustments. Log all changes so you can review and reverse them if needed. And test new scripts in preview mode extensively before running them on live campaigns.

Reporting Automation Scripts

Automated reporting scripts save hours of manual work every week and ensure stakeholders receive consistent, timely performance updates.

Google Sheets reporting:

The most common reporting script pulls campaign performance data and writes it to a Google Sheet on a daily or weekly basis. This creates a running log of performance metrics that can be used for trend analysis, client reporting, or executive dashboards. The script can populate multiple tabs — one for campaign-level data, one for ad group-level data, one for keyword-level data — and format the data with headers and conditional formatting.

Email reports:

Scripts can generate HTML email reports and send them directly to stakeholders. A weekly performance summary email might include top-line metrics (spend, clicks, conversions, CPA, ROAS), comparison against the previous week and the same week last year, and callouts for any significant changes. This is particularly useful for client-facing agencies that need to provide regular updates without spending time building manual reports.

Anomaly detection reports:

A script that compares current performance against historical averages can identify anomalies worth investigating. If today’s CPC is 50% higher than the 30-day average, or if conversion rate has dropped by 30% compared to the same day of the week over the past four weeks, the script flags these anomalies in a report. This proactive monitoring catches issues before they become costly problems.

Search query analysis:

Scripts can analyse search query reports to identify high-spend queries that are not converting, potential negative keywords to add, and high-performing queries that should be added as exact match keywords. The script can output these recommendations to a Google Sheet for review, saving hours of manual search query analysis.

Quality Score tracking:

Google Ads does not provide historical Quality Score data by default. A script can log Quality Scores for all keywords daily, creating a historical record that lets you track Quality Score trends over time and correlate changes with ranking and cost performance. This data is invaluable for diagnosing performance issues and demonstrating improvements from optimisation work.

Reporting scripts, combined with proper PPC audit processes, give you a comprehensive view of account health without the manual effort of pulling data from multiple sources.

Alert and Monitoring Scripts

Monitoring scripts act as your early warning system, catching problems before they waste significant budget or cost you conversions.

Broken landing page alerts:

One of the most valuable monitoring scripts checks all active ad URLs for HTTP errors. If any landing page returns a 404, 500, or other error status, the script sends an immediate email alert. This prevents the common scenario where a website change breaks a landing page and ads continue to drive paid traffic to an error page for days before anyone notices.

The script iterates through all active ads, extracts the final URL, sends an HTTP request to each URL, and checks the response status code. Run this script daily — or even multiple times per day for high-spend accounts.

Conversion tracking alerts:

A script can monitor your conversion data and alert you when conversions drop below expected levels. If your account typically records 10 or more conversions per day and today has recorded zero by 3 PM, something may be wrong — a tracking tag could be broken, a landing page form could be malfunctioning, or a backend integration could have failed. The script compares current conversion counts against historical averages and sends an alert when the variance exceeds your defined threshold.

Spend anomaly alerts:

If a campaign’s spend suddenly spikes well above its normal daily average — perhaps due to a competitor pulling out and your ads capturing more impressions — a script can alert you before the overspend becomes significant. This is especially important for campaigns with limited budgets where a single day of overspending can consume a week’s budget.

Ad disapproval monitoring:

Google regularly reviews ads and can disapprove them for policy violations. A monitoring script checks for newly disapproved ads and sends an alert so you can address the issue promptly. Without this monitoring, disapproved ads can go unnoticed for weeks, reducing your campaign’s reach.

Account structure alerts:

Scripts can monitor account structure for issues like campaigns without active ads, ad groups with no keywords, or keywords with no active ads. These structural issues silently waste budget or prevent campaigns from serving, and they are easy to miss during routine optimisation. A weekly account structure audit script catches these issues automatically.

For a Google Ads agency managing multiple client accounts, these monitoring scripts are essential. They scale your oversight capability far beyond what manual checking can achieve and ensure no account falls through the cracks.

Advanced Script Techniques

Once you are comfortable with basic scripts, several advanced techniques can extend their capabilities significantly.

External API integration:

Google Ads scripts can make HTTP requests to external APIs using UrlFetchApp. This opens up possibilities like pulling real-time data from your CRM to adjust bids based on lead quality, fetching inventory data from your e-commerce platform, integrating with project management tools to create tasks when certain conditions are met, or pulling exchange rate data to adjust bids for cross-border campaigns targeting Singapore from other markets.

Manager account (MCC) scripts:

If you manage multiple Google Ads accounts through a Manager Account (MCC), you can write scripts that run across all child accounts simultaneously. This is essential for agencies managing many client accounts. An MCC script can generate a consolidated report across all accounts, apply consistent monitoring and alerting across every account, and make bulk changes to campaign settings across multiple accounts in a single run.

MCC scripts use the AdsManagerApp object instead of AdsApp. The script iterates through selected accounts using AdsManagerApp.accounts() and executes functions within each account context.

Data caching with Google Sheets:

Google Ads scripts have execution time limits — 30 minutes for standard scripts. For complex operations, use Google Sheets as a data cache. The script can process a portion of the work during each run, store progress in a sheet, and continue from where it left off in the next run. This technique is essential for scripts that need to process large accounts or perform time-intensive operations.

Error handling and logging:

Production scripts should include robust error handling. Use try-catch blocks around operations that might fail — API calls, data processing, and account changes. Log errors to a Google Sheet so you can review and debug issues. Include a summary email at the end of each run that reports how many operations succeeded, how many failed, and the specific errors encountered.

Script libraries:

As you accumulate scripts, you will notice common patterns — date formatting functions, email-sending utilities, Sheet-writing helpers. Create a library of reusable functions that you can include in new scripts. This reduces development time and ensures consistency across your script portfolio.

When building advanced scripts, performance marketing teams should always document the script’s purpose, logic, configuration parameters, and maintenance requirements. Scripts without documentation become unmaintainable when the original author leaves or forgets the details.

Script Management Best Practices

As your script portfolio grows, managing scripts becomes a discipline in itself. Poor script management leads to conflicts, unintended changes, and wasted effort.

Version control:

Google Ads does not provide built-in version control for scripts. Maintain a copy of every script in an external repository — Google Drive, GitHub, or another version control system. Include version numbers and change logs so you can track modifications and roll back if needed.

Naming conventions:

Adopt a consistent naming convention for your scripts. Include the script’s function, the account or campaign it applies to, and a version number. For example: “Budget Pacing – All Campaigns – v2.3” or “Landing Page Monitor – Brand Campaigns – v1.1.” Clear naming prevents confusion when managing dozens of scripts across multiple accounts.

Testing protocol:

Always test scripts using the Preview function before scheduling them. Review the preview output carefully — check that the right entities were selected, the correct changes would be made, and no unintended side effects occur. For scripts that make account changes, test on a low-spend campaign first before deploying account-wide.

Scheduling discipline:

Keep a master schedule of all active scripts, their run times, and their functions. Avoid scheduling scripts that modify the same entities at overlapping times — if a budget pacing script and a bid adjustment script both run at midnight, they may conflict. Stagger script execution times and document dependencies.

Regular review cycle:

Review all active scripts quarterly. Disable scripts that are no longer needed, update scripts that reference outdated campaign structures, and verify that all scripts are running successfully. Check the script execution log in Google Ads to identify scripts that are failing silently.

Access and permissions:

Scripts run with the permissions of the user who created them. If that user’s access is revoked, the scripts will stop running. Document which user account is associated with each script, and consider using a dedicated service account for script execution in agency environments.

Frequently Asked Questions

Do I need to know JavaScript to use Google Ads scripts?

A basic understanding of JavaScript helps, but you do not need to be a professional developer. Many useful scripts are available as ready-made templates that require only minor modifications — typically changing campaign names, email addresses, or threshold values. Google’s documentation includes numerous code examples, and communities like the Google Ads scripts forum provide free scripts for common use cases. If you can follow logical instructions and make basic text edits, you can use most template scripts. For custom scripts, a few hours spent learning JavaScript fundamentals — variables, loops, conditionals, and functions — will give you enough knowledge to write simple scripts and modify existing ones to suit your needs.

Are Google Ads scripts safe to use on live campaigns?

Google Ads scripts are safe when used responsibly. The Preview function lets you test every script before running it on your live account — use it without exception. Set safeguards in your scripts, such as maximum bid limits, budget caps, and change count limits, to prevent runaway modifications. Start with read-only scripts (reporting and monitoring) before progressing to scripts that make account changes. Log all changes your scripts make so you can review and reverse them if needed. The biggest risk is not from the scripts themselves but from deploying untested scripts or scripts you do not fully understand. Always review the script’s logic before running it, and start with a small scope before applying changes account-wide.

How many scripts can I run on a Google Ads account?

Google Ads allows up to 100 scripts per account, which is more than sufficient for most advertisers. Each script can run for up to 30 minutes per execution (or 60 minutes for MCC scripts). Scripts can be scheduled to run at intervals from hourly to monthly. The practical limitation is not the number of scripts but the total execution time and the number of API calls. If you have many scripts running frequently, monitor their execution times and ensure they are completing within the time limits. For large accounts with extensive scripting needs, optimise scripts for efficiency — use batch operations instead of individual entity updates, and cache data in Google Sheets to avoid redundant processing.

Can Google Ads scripts work with Smart Bidding campaigns?

Google Ads scripts can work alongside Smart Bidding, but with important caveats. Smart Bidding manages bids automatically, so scripts that adjust individual keyword bids will conflict with Smart Bidding strategies. However, scripts can still add significant value to Smart Bidding campaigns. Use scripts for budget management (Smart Bidding does not manage budgets), reporting and data extraction, landing page monitoring, search query analysis, negative keyword management, and ad copy testing. Scripts can also adjust campaign-level settings like budgets and location targeting that Smart Bidding does not control. The key is to let Smart Bidding handle bid-level decisions while using scripts for everything else.

What happens if a Google Ads script encounters an error during execution?

When a script encounters an error, it depends on how the script is written. Without error handling, the script will stop execution at the point of failure — any operations completed before the error will have been applied, but remaining operations will not run. This partial execution can leave your account in an inconsistent state, which is why error handling is essential. Use try-catch blocks around operations that might fail. In the catch block, log the error details and continue processing the remaining operations. At the end of the script, send a summary of any errors via email. Google Ads also logs script execution results, which you can review in the Scripts section. Set up a process to review script execution logs regularly to catch failures that your error-handling code might miss.

Google Ads scripts are one of the most underused tools in the Google Ads toolkit. Even a handful of well-chosen scripts — budget pacing, landing page monitoring, and automated reporting — can save hours of manual work per week while improving campaign performance through faster reaction times and more consistent optimisation. Start with the basics, build your confidence, and progressively automate the repetitive tasks that consume your team’s time.