Try to use 2 keywords if possible. I use both, as needed. I use hyphens for related information, and underscores as I would a space. Do not use more than 3-4 words in file names. Don’t start or end your filename with a space, period, hyphen, or underline. Technical Background Whereas if there's a hyphen (or spaces) between the words in a name (snare-soft-01), I won't get the whole name, just a single word of it. When we’re auditing a website for search engine optimisation (SEO), one of the common errors we find is the use of underscores in URLs and image filenames rather than hyphens. One of the reasons this question is so debated is because of a poorly worded comment made by Google’s Matt Cutts in 2007 that to many people seemed to imply that underscores were treated as word separators. When writing for website, i choose underscore _ as space separators for file names, not dash. Use actual service name in your file name such as computer-repairing.htm. Separate the keywords with hyphens rather than underscores. I'll take all the weight I can get no matter how small. It’s a hot topic for argument when the time comes for corporate standards (and when Network Engineers have beverages in a public house). Nor should you use an underscore (_) to separate words. Because, when forced between these 2 choices, underscore is a better choice to stand for space because dash has significance in english words. The correct way to name a page about "plasma televsions" would be "plasma-televisions.html". From Building Skills in Python:. History of the hyphen vs. underscore SEO URL debate. There is no "best". Most operating systems are case sensitive; always use lowercase. "But who really searches for terms like 'search_engine_optimisation'? The only way to split two words in a file name is by using a hyphen. File Name Example. Avoid using spaces and underscores; use a hyphen instead. Keep your filenames to a reasonable length and be sure they are under 31 characters. But in my case, I can't afford to pass anything up. A file name like exercise_1.py is better than the name execise-1.py.We can run both programs equally well from the command line, but the name with the hyphen limits our ability to write larger and more sophisticated programs. You can make a sure bet that this issue reflects one of the many, over 200 factors that Google takes into account when evaluating your website. So a file for a class (CS 3358), coming from a "Assignment" folder, named "file.cpp" I would name "CS-3358_Assignment_file.cpp", and that system is just for that type of file or folder. When I double-click a name which is made up of a bunch of words, if the words are separated by an underscore (snare_soft_01), then the entire name gets selected when it's double-clicked. Namely, the use of underscores and hyphens in object names and devices. Underscores are seen by search engines generally as “word combiners”, and hyphens are seen as “word separators.” Scott was right, never use underscores for anything. It's frequently argued that user's have a hard time even finding the underscore" No one does. When naming your files with phrases, don’t leave spaces between words. It seems like a tiny point to deal with but for SEO it can be really important to get this right as it helps establish the keywords Google will index. You use what works for you. Now, I figure that there are three possible grammar options for making names – hyphens, underscore and CamelCase. Listed below are some filenames which would be ideal from the users' point of view as well as SEO. Most SEO experts will tell you there isn't a lot of weight given to file names. But that's exactly why it doesn't assist your SEO to use the underscore in file names, because that's not what people are using in searches. 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