Google Maps FID Converter

A Google Maps FID (Feature ID) is the long identifier you see in Maps developer URLs, usually written as two hexadecimal chunks joined by a colon, like 0x89c259...:0x8d6c8c... . The second chunk is the part that maps to a place's CID, the decimal number Google uses to point directly at a single business listing. If you work in local SEO you run into this every time you need a clean cid= link for a review request, a citation audit, or a Google Business Profile reference.

The problem is the math. Turning that hex google maps fid into a usable decimal CID by hand means base-16 conversion on numbers far too big for a normal calculator, and doing it the other way (decimal CID back to hex) is just as fiddly. This converter handles both directions instantly in your browser using BigInt, so nothing is rounded off and no data leaves your machine. Paste a full FID or a plain CID, press Convert, and copy the result.

You get the matching CID and FID values plus a ready-to-use https://maps.google.com/?cid= link you can drop straight into a spreadsheet or share with a client. For tracking how those listings actually rank across a map of search points, ProMapRanker takes it further, so you can start free when you want the full local rank picture.

FAQ

What is a Google Maps FID and where do I find it?

A google maps fid is the Feature ID Google assigns to a place. You can pull it from the Maps URL or the Places API response, where it appears as two hex values separated by a colon. The second value is the one that converts to the CID, which is why this tool reads the chunk after the colon.

What is the difference between an FID and a CID?

The FID is the full hex identifier (both chunks). The CID is the decimal form of the second chunk, and it is what you put in a cid= URL to link straight to a business listing. They describe the same place, just in different formats, and this converter moves cleanly between them.

Is my data sent anywhere when I convert?

No. The conversion is pure JavaScript running in your browser, with no server call and no logging. You can paste sensitive client identifiers without any of them leaving your device.