A plagiarism detector is a software application designed to make certain that a written work being published on the internet is original and has not been copied from another written article already available on the internet.
Although a plagiarism detector is not always necessary there are times when this is the only way to determine without a doubt if something will be accepted as your own work on the internet.
A plagiarism detector helps people from making a mistake and being falsely accused of copying the written words of another person.
Many times when a student or freelance writer is composing an article for publication they inadvertently write something in such a manner as to closely resemble the works of another writer.
When this happens the first publication is referred to by the free plagiarism checker that is used to verify the work.
The individual writing the material will then have the opportunity to rephrase their work so they are not confused with the other article or publication.
A free plagiarism checker is no less reliable than one that you pay money to download.
The free plagiarism checker is provided to you by the same companies that provide the versions you have to purchase.
The biggest difference in the free versions and the ones that cost you money is the amount of material you can send through the free one at one time.
In the versions of this software that are provided with no cost or obligation to you there will be a size limit on the written piece that you can submit at one time.
You may also have a wait time between the pieces you can submit.
This does not make the software less reliable, it makes it a little more difficult for people who have a lot of written material to check to be able to use.
If you are going to need to have large files checked then you may want to purchase a version of this software that will allow you to do this with ease.
Some of the websites that provide the free versions also offer versions you pay to use so that individuals who have a greater need of the service can use it more frequently and can get larger writings analyzed in a more time efficient manner.
Whether you pay to have a subscription that allows you to check large pieces, or you use the version that is without expense, you will be using the same program and will have access to the same quality check.
There is no difference in the amount of reliability between the free version and the pay to use version.