Free program called HTTrack can be used to browse a website offline on your own PC.
You can download the program from
http://www.httrack.com and it’s around 4 MB. The program is malware-free according to VirusTotal and Web of Trust. Once downloaded (I recommend the portable “without installer” version), unzip the file and double-click on WinHTTrack.exe to run it. You’ll be asked to pick a name and category for your project, and to specify the URL of the site. That’s really all there is to it. The program will then attempt to download all of the files that make up the site, so you can browse and search them on your own PC.
Depending on the site you try to download, you may not get a perfectly usable or complete copy. But for casual browsing or searching of the full text of the site, it’s a useful feature to have. Just be sure not to try to download a huge site such as Wikipedia!
One point worth noting is that, when you’re asked for a folder in which to store the downloaded site, don’t choose any folder that already contains other folders. If you do, and you don’t pay careful attention to the program’s prompts, it will delete all of those other folders when you exit the program because it thinks they are remnants of previous downloaded sites. But as long as you watch out for the prompts to delete those folders, the program is very useful indeed.