If you are building a spreadsheet containing hundreds of website addresses—perhaps for an SEO audit, a sales prospect list, or a directory of company resources—data accuracy is critical. A single typo in a URL (like missing the “http://” or accidentally typing a comma instead of a period) means the link is broken.
Manually clicking 500 links to ensure they are formatted correctly is impossible. Fortunately, Google Sheets includes a highly specialized, rarely used logic function called ISURL. This formula instantly evaluates the text in a cell and mathematically verifies if it is formatted as a valid, clickable web address, allowing you to instantly flag bad data.
The Syntax of ISURL
The ISURL function is a boolean operator, meaning it can only return one of two answers: TRUE or FALSE.
The syntax is incredibly simple: =ISURL(value)
- If the cell contains
https://digitash.com, it returns TRUE. - If the cell contains
digitash.com(missing the protocol), it returns FALSE. - If the cell contains
https://digitash,com(comma instead of period), it returns FALSE.
Step 1: Setting Up the Validation Column
Assume you have a list of web addresses in Column A starting at row 2.
- Click on cell B2.
- Type the formula:
=ISURL(A2) - Press Enter.
- Click the small blue square in the bottom right corner of cell B2 and drag it down your column to evaluate the entire list.
You will now have a column cleanly showing TRUE for properly formatted links and FALSE for broken text strings.
Step 2: Creating an Automated Data Cleanup Dashboard
While seeing TRUE or FALSE is helpful, we can wrap the ISURL function inside a standard IF statement to create a much more readable “Status” column that aggressively flags errors for your team.
- Click on an empty cell (e.g., C2).
- Paste the following formula:
=IF(ISBLANK(A2), "", IF(ISURL(A2), "Valid Link ✅", "INVALID FORMAT ❌")) - Press Enter and drag the formula down.
How the formula works:
IF(ISBLANK(A2), "",ensures that if the cell is completely empty, the status column stays blank rather than throwing a false error.IF(ISURL(A2), "Valid Link ✅",checks the link. If it passes the test, it outputs a friendly confirmation message."INVALID FORMAT ❌"acts as the fallback. If the link fails the test, it shouts at the user in all caps that the data needs to be fixed.
Important Limitation: Formatting vs. Liveness
It is crucial to understand that ISURL is a syntax validator, not a server ping tool. It checks if the text string mathematically conforms to the rules of a Uniform Resource Locator (requiring a protocol like http/https, a domain name, and a valid top-level domain).
If you type https://thiswebsiteiscompletelyfakeanddoesnotexist.com, the ISURL function will return TRUE because the text is formatted perfectly, even though the website itself is dead. ISURL guarantees the link is clickable, but it cannot guarantee the server at the other end is online.