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Advantages of Web-Based Captioning

While the web-based tools vary in terms of interfaces and features, they tend to have a number of key advantages in common:

Easy to use. With few exceptions, the tools do not require programming skills or technical knowledge.
File format transparency. Most tools accept multiple file formats; you just upload whatever you have.
Simplify asset acquisition. If you're captioning a library of videos, representing different file formats, there is no need to standardize the format.
Customization. Many allow you to customize the tools to fit your needs.
Free or low cost. Most tools do not require any significant investment other than your time.
File output. Some web-based tools allow you to export your work as a standard caption file (such as smil, sami, or ttml) that you can implement as appropriate.