otp_plus

A customizable Flutter OTP (One-Time Password) input widget package with automatic fill sms code. otp_plus offers enhanced flexibility, styling, and input management for OTP or PIN entry, supporting both individual input boxes and paste detection with seamless input distribution.

Features

• Fill code automatic from SMS
• Multiple OTP input fields with customizable length
• Paste support with automatic digit splitting across fields
• Obscured input option (e.g., for password-style OTP)
• Flexible styling: shape (square, underline, circle), size, spacing
• Keyboard navigation and backspace focus handling
• Customizable cursor appearance and behavior
• RTL and LTR text direction support
• Complete control over input decoration and text style
• Callback on OTP completion to easily handle entered codes

![OTP Plus Demo]

Installation

Add this to your pubspec.yaml:

dependencies:
  otp_plus: ^1.1.0

Then run:

flutter pub get

Usage

import 'package:flutter/material.dart';
import 'package:otp_plus/otp_plus_inputs.dart';

class MyOtpScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Enter OTP')),
      body: Center(
        child: OtpPlusInputs(
          size: 50,
          length: 6,
          shape: OtpFieldShape.square,
          textDirection: TextDirection.ltr,
          onChanged: (code) {
            debugPrint('On Changed : $code');
          },
          onSubmit: (code) {
            debugPrint('On Submit : $code');
          },
          //Add optional values here
          onCompleted: (code) {
            // Add OTP verification logic here
            debugPrint('OTP entered: $code');
          },
        ),
      ),
    );
  }
}

API Reference

OtpPlusInputs Parameters

Parameter	Type	Description	Default
shape	OtpFieldShape	Shape of each OTP input field (square, underline, circle).
enableAutoFill	bool	Handle code fill from sms
Required
length	int	Number of OTP digits to input.	Required
textStyle	TextStyle?	Custom text style for digits inside each field.	null
obscureText	bool	Whether to obscure the text (e.g., for passwords).	false
obscuringCharacter	String	Character to display when text is obscured.	'*'
horizontalSpacing	double	Horizontal spacing between each OTP input field.	10
size	double	Width and height of each input box.	50
verticalSpacing	double	Vertical spacing when fields wrap to the next line.	10
textDirection	TextDirection	Text direction for the entire widget (ltr or rtl).	TextDirection.ltr
cursorColor	Color	Color of the blinking cursor.	Colors.black
enabled	bool?	Whether the input fields are enabled for interaction.	null (inherited from theme)
ignorePointers	bool?	Whether to ignore pointer events (tap, drag, etc.) on the fields.	null
cursorWidth	double	Width of the cursor.	1.5
cursorHeight	double?	Height of the cursor. If null, uses default based on font.	null
cursorRadius	Radius?	Radius for cursor corners (rounded cursor).	null
cursorOpacityAnimates	bool?	Whether cursor opacity should animate (fade in/out).	null
undoController	UndoHistoryController?	Controller to manage undo/redo history for text fields.	null
textInputAction	TextInputAction?	Type of action button on the keyboard (e.g., next, done).	null
textCapitalization	TextCapitalization	Capitalization behavior for input (e.g., none, characters, words).	TextCapitalization.none
style	TextStyle?	Optional global text style override (applies to underlying TextField).	null
strutStyle	StrutStyle?	Optional strut style to control line height and alignment.	null
textAlign	TextAlign	Horizontal alignment of text within each field.	TextAlign.center
textAlignVertical	TextAlignVertical	Vertical alignment of text within each field.	TextAlignVertical.center
contentPadding	EdgeInsets?	Inner padding of each input field.	EdgeInsets.symmetric(horizontal: 10, vertical: 10)
onComplete	void Function(String)?	Called when all fields are filled (OTP is complete).	null
onChanged	void Function(String)?	Called whenever the OTP value changes (on any field update).	null
onSubmit	void Function(String)?	Called when user submits (e.g., presses enter/done on keyboard).	null
borderColor	Color?	Border color in default (unfocused, non-error) state.	Colors.grey
focusedBorderColor	Color?	Border color when the field is focused.	Colors.black
errorBorderColor	Color?	Border color when the field is in error state.	Colors.red
pasteText	String?	Label text for the “Paste” option in context menu (long-press menu).	'Paste'

OtpFieldShape

Defines the visual style of the OTP input fields:

• square: Square bordered fields
• underline: Underline style
• circle: Circular bordered fields

Notes

• The widget automatically manages focus navigation between fields on input and backspace key presses.
• Use onCompleted to capture the final OTP code when all fields are filled.
• The widget uses TextInputFormatter to restrict input to single digits.

Contribution

Contributions and improvements are welcome! Feel free to open issues or pull requests.

License

This project is licensed under the MIT License.