How to use google maps without api key

source

In June 2016 Google announced that they would stop supporting keyless usage, meaning any request that doesn’t include an API key or Client ID. This will go into effect on June 11 2018, and keyless access will no longer be supported

Now you must have API key. You can generate that in google developer console. Here is LINK to the explanation.

Note : This answer is now out-of-date. You are now required to have an API key to use google maps. Read More

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you need to change your API from V2 to V3, Since Google Map Version 3 don't required API Key

Check this out..

write your script as

<script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=false"></script>

Below code No need any api to embed map on your website

?q=search here

Full url

https://maps.google.com/maps?q=chennai&t=&z=13&ie=UTF8&iwloc=&output=embed

FULL CODE

<div class="mapouter"><div class="gmap_canvas"><iframe width="600" height="500" id="gmap_canvas" src="https://maps.google.com/maps?q=chennai&t=&z=13&ie=UTF8&iwloc=&output=embed" frameborder="0" scrolling="no" marginheight="0" marginwidth="0"></iframe></div></div>