Remove padding in Flutter Container > FlatButton

I find it easier to just wrap the button in a ButtonTheme.

Specify the maxWith and height (set to zero to wrap the child) and then pass your button as the child.

You can also move most of your button properties from the button to the theme to gather all properties in one widget.

ButtonTheme(
  padding: EdgeInsets.symmetric(vertical: 4.0, horizontal: 8.0), //adds padding inside the button
  materialTapTargetSize: MaterialTapTargetSize.shrinkWrap, //limits the touch area to the button area
  minWidth: 0, //wraps child's width
  height: 0, //wraps child's height
  child: RaisedButton(onPressed: (){}, child: Text('Button Text')), //your original button
);

FlatButton(
  padding: EdgeInsets.all(0) 
)

did the trick for me

Courtesy of FlatButton introduces phantom padding on flutter's git.

If anyone needs a widget with onPressed event without Flutter padding it.

You should use InkWell

InkWell(
    child: Center(child: Container(child: Text("SING UP"))),
    onTap: () => onPressed()
);

A rectangular area of a Material that responds to touch.

For all those who are wondering on how to remove the default padding around the text of a FlatButton, you can make use of RawMaterialButton instead and set the constraints to BoxConstraints() which will reset the default minimum width and height of button to zero.

RawMaterialButton can be used to configure a button that doesn't depend on any inherited themes. So we can customize all default values based on our needs.

Example:

RawMaterialButton(
    constraints: BoxConstraints(),
    padding: EdgeInsets.all(5.0), // optional, in order to add additional space around text if needed
    child: Text('Button Text')
)

Please refer to this documentation for further customization.

Screenshot:

Set minimumSize and padding to zero. For example:

• ElevatedButton (previously RaisedButton)

  ElevatedButton(
    style: ElevatedButton.styleFrom(
      minimumSize: Size.zero, // <-- Add this
      padding: EdgeInsets.zero, // <-- and this
    ),
    onPressed: () {},
    child: Text('Button'),
  )
  

• TextButton (previously FlatButton)

  TextButton(
    style: TextButton.styleFrom(
      minimumSize: Size.zero, // <-- Add this
      padding: EdgeInsets.zero, // <-- and this
    ),
    onPressed: () {},
    child: Text('Button'),
  )
  

You can also use the raw MaterialButton

MaterialButton(
  onPressed: () {},
  color: Colors.blue,
  minWidth: 0,
  height: 0,
  padding: EdgeInsets.zero,
  child: Text('Button'),
)

you can also change the button width by surrounding it with a sized box:

SizedBox(
  width: 40,
  height: 40,
  child: RaisedButton(
    elevation: 10,
    onPressed: () {},
    padding: EdgeInsets.all(0), // make the padding 0 so the child wont be dragged right by the default padding
    child: Container(
      child: Icon(Icons.menu),
    ),
  ),
),

Since FlatButton is now deprecated you can use TextButton. So if you want to remove the padding on TextButton, you would do it like this:

TextButton( style: ButtonStyle(padding: MaterialStateProperty.all(EdgeInsets.zero))

wrap your FlatButton inside a container and give your custom width eg.

Container(
            width: 50,
            child: FlatButton(child: Text("WORK",style: Theme.of(context).textTheme.bodyText1.copyWith(fontWeight: FontWeight.bold),),
            onPressed: () => Navigator.pushNamed(context, '/locationChange'),materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,padding: EdgeInsets.all(0),),
          )

Use EdgeInsetsGeometry padding

padding property helps us to specify the padding of FlatButton internal child. Here internal child is Text widget.

FlatButton(
  padding: EdgeInsets.all(5),
  child: Text('Flat Button'),
)