Most old websites have a fixed layout so many developers who are in the situation of giving a facelift to a legacy website often have to decide between Responsive VS Fixed layout.
The rise of Bootstrap and responsive layout with its extremely easy to use framework has certainly contributed to a many developers dropping their fixed layout.
I have observed how many web developers have just jumped on the bandwagon and adopted Bootstrap because it is just so darn easy. As an engineer I feel that many blindly go for Bootstrap or similar framework without much thought.
So below I give a more nuanced look into what to consider before redesigning an existing web application. The factors below have been picked especially for rich interactive social web applications rather than simple informational public homepages. I also assume you don't have unlimited resources so you are, as the rest of us, constrained to a limited development time.
Factors to considerA - Esthetics.
B - Speed of user interaction.
C - Accessibility/ease of use.
D - Development time.
E - Screen size of users.
F - User browser maximized or not.
G - Mobile support.
All projects are different so you have to decide which of these factors are more important to you.
A: Do you want our application to look perfect with less cost?
It is easier to make the site look good with fixed layout because layout often breaks with fluid layout. Images that users add to content areas don’t wrap as they expect on other screens. Headings added by users don’t wrap how they like on other computers. Background images can look weird etc.
If you have few resources and you want the app to look really good (on PC) you might want to steer towards fixed layout.
B: Do you have super users?
How are users using the app? Are there mostly highly drilled users? Is it a Line of Business app where the business will measure the time users spend doing their work in the app? Do users have to be able to complete their tasks really quick?
By using more screen real estate users can perform actions faster and find information faster without having to scroll, use paging or navigate.
If you have requirements for being able to do lots of actions fast you may want to steer towards responsive layout since you are able to use more of the screen width.
C: Do you have to be particularly user friendly?
Using more screen real estate will often lead to more “things” being visible on the screen. More things = higher cognitive load. For super users this is fine but for users who is not using the solution that often and for senior users this will reduce their user experience because they are simply overwhelmed by the content and options visible.
So who are you targeting? old people, beginners, non-computer literates.
Responsive design does not have to increase the amount of stuff on the screen but it usually does. A fixed layout is easier to learn as it always looks the same. If you by any chance did not maximize the browser window as you usually do you might get a different view than you are used to. For computer illiterate and infrequent users this can pose an issue. With a mobile first design approach, a max width and adaptive layout the UI can still look clean but this is not compatible with B above.
If you have requirements for being very user friendly you may want to steer towards fixed layout.
D: How much time do you have?
My initial starting point for this blog post was that you were about to decide to change from fixed to responsive layout so naturally you are in for more work if you decide to change. Also responsive layout requires more development and testing to check that it looks good on different screen sizes.
If you have little time you may want to steer towards fixed layout.
E: What's the typical screen size of your users?
If a significant percentage is using a screen that is smaller than the fixed layout width or they are using phones and tablets then you should definitely switch to responsive. If users are having a screen size that is smaller than our fixed layout it will cause bad horizontal scroll bars or zooming that makes it very cumbersome to hit buttons etc.
F: Do users have their browser maximized?
Could for example be because users need to keep multiple windows side by side etc for example when they need to copy content from another window and into the app.
In this case a responsive layout may work better.
G: Do you have to support mobile?
This is usually the one biggest concern that will decide it all. Is it a strategic goal that the app work well on mobile? Do you have plans to develop a separate mobile web app or even native mobile app? For many it is just too resource demanding to develop a separate mobile/native app so in this case you would go with responsive layout.
What are others using(Note that it is usually not a black or white choice. Most sites use a mix of techniques for example facebook is fixed but uses some adaptive techniques such as the chat and contacts feature on the right side)
- Jira (Confluence)
Side noteWhy does Wikipedia have fluid layout? Because all you do there is read articles. Ease of reading is extremely important there. With fluid layout the user has full control of the readability (line length etc) by resizing the browser window and adjusting browser font size.