HTML5 canvas based smooth signature drawing

Overview

Signature Pad npm Build Status Code Climate

Signature Pad is a JavaScript library for drawing smooth signatures. It's HTML5 canvas based and uses variable width Bézier curve interpolation based on Smoother Signatures post by Square. It works in all modern desktop and mobile browsers and doesn't depend on any external libraries.

Example

Looking for a maintainer

I wrote this library as it solved a problem I had at the time. Unfortunately, I no longer have time or motivation to work on this library anymore.

Please reach out to me if you'd like to help out and eventually maintain this project.

Demo

Demo works in desktop and mobile browsers. You can check out its source code for some tips on how to handle window resize and high DPI screens. You can also find more about the latter in HTML5 Rocks tutorial.

Other demos

Installation

You can install the latest release using npm:

npm install --save signature_pad

or Yarn:

yarn add signature_pad

You can also add it directly to your page using <script> tag:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/signature_pad.min.js"></script>

You can select a different version at https://www.jsdelivr.com/package/npm/signature_pad.

This library is provided as UMD (Universal Module Definition) and ES6 module.

Usage

API

const canvas = document.querySelector("canvas");

const signaturePad = new SignaturePad(canvas);

// Returns signature image as data URL (see https://mdn.io/todataurl for the list of possible parameters)
signaturePad.toDataURL(); // save image as PNG
signaturePad.toDataURL("image/jpeg"); // save image as JPEG
signaturePad.toDataURL("image/svg+xml"); // save image as SVG

// Draws signature image from data URL.
// NOTE: This method does not populate internal data structure that represents drawn signature. Thus, after using #fromDataURL, #toData won't work properly.
signaturePad.fromDataURL("data:image/png;base64,iVBORw0K...");

// Returns signature image as an array of point groups
const data = signaturePad.toData();

// Draws signature image from an array of point groups
signaturePad.fromData(data);

// Draws signature image from an array of point groups, without clearing your existing image (clear defaults to true if not provided)
signaturePad.fromData(data, { clear: false });

// Clears the canvas
signaturePad.clear();

// Returns true if canvas is empty, otherwise returns false
signaturePad.isEmpty();

// Unbinds all event handlers
signaturePad.off();

// Rebinds all event handlers
signaturePad.on();

Options

dotSize
(float or function) Radius of a single dot.
minWidth
(float) Minimum width of a line. Defaults to 0.5.
maxWidth
(float) Maximum width of a line. Defaults to 2.5.
throttle
(integer) Draw the next point at most once per every x milliseconds. Set it to 0 to turn off throttling. Defaults to 16.
minDistance
(integer) Add the next point only if the previous one is farther than x pixels. Defaults to 5.
backgroundColor
(string) Color used to clear the background. Can be any color format accepted by context.fillStyle. Defaults to "rgba(0,0,0,0)" (transparent black). Use a non-transparent color e.g. "rgb(255,255,255)" (opaque white) if you'd like to save signatures as JPEG images.
penColor
(string) Color used to draw the lines. Can be any color format accepted by context.fillStyle. Defaults to "black".
velocityFilterWeight
(float) Weight used to modify new velocity based on the previous velocity. Defaults to 0.7.

You can set options during initialization:

const signaturePad = new SignaturePad(canvas, {
    minWidth: 5,
    maxWidth: 10,
    penColor: "rgb(66, 133, 244)"
});

or during runtime:

const signaturePad = new SignaturePad(canvas);
signaturePad.minWidth = 5;
signaturePad.maxWidth = 10;
signaturePad.penColor = "rgb(66, 133, 244)";

Events

beginStroke
Triggered before stroke begins.
endStroke
Triggered after stroke ends.
beforeUpdateStroke
Triggered before stroke update.
afterUpdateStroke
Triggered after stroke update.

You can add listeners to events with .addEventListener:

const signaturePad = new SignaturePad(canvas);
signaturePad.addEventListener("beginStroke", () => {
  console.log("Signature started");
}, { once: true });

Tips and tricks

Handling high DPI screens

To correctly handle canvas on low and high DPI screens one has to take devicePixelRatio into account and scale the canvas accordingly. This scaling is also necessary to properly display signatures loaded via SignaturePad#fromDataURL. Here's an example how it can be done:

function resizeCanvas() {
    const ratio =  Math.max(window.devicePixelRatio || 1, 1);
    canvas.width = canvas.offsetWidth * ratio;
    canvas.height = canvas.offsetHeight * ratio;
    canvas.getContext("2d").scale(ratio, ratio);
    signaturePad.clear(); // otherwise isEmpty() might return incorrect value
}

window.addEventListener("resize", resizeCanvas);
resizeCanvas();

Instead of resize event you can listen to screen orientation change, if you're using this library only on mobile devices. You can also throttle the resize event - you can find some examples on this MDN page.

When you modify width or height of a canvas, it will be automatically cleared by the browser. SignaturePad doesn't know about it by itself, so you can call signaturePad.clear() to make sure that signaturePad.isEmpty() returns correct value in this case.

This clearing of the canvas by the browser can be annoying, especially on mobile devices e.g. when screen orientation is changed. There are a few workarounds though, e.g. you can lock screen orientation, or read an image from the canvas before resizing it and write the image back after.

Handling data URI encoded images on the server side

If you are not familiar with data URI scheme, you can read more about it on Wikipedia.

There are 2 ways you can handle data URI encoded images.

You could simply store it in your database as a string and display it in HTML like this:

<img src="data:image/png;base64,iVBORw0K..." />

but this way has many disadvantages - it's not easy to get image dimensions, you can't manipulate it e.g. to create a thumbnail and it also has some performance issues on mobile devices.

Thus, more common way is to decode it and store as a file. Here's an example in Ruby:

require "base64"

data_uri = "data:image/png;base64,iVBORw0K..."
encoded_image = data_uri.split(",")[1]
decoded_image = Base64.decode64(encoded_image)
File.open("signature.png", "wb") { |f| f.write(decoded_image) }

Here's an example in PHP:

$data_uri = "data:image/png;base64,iVBORw0K...";
$encoded_image = explode(",", $data_uri)[1];
$decoded_image = base64_decode($encoded_image);
file_put_contents("signature.png", $decoded_image);

Here's an example in C# for ASP.NET:

var dataUri = "data:image/png;base64,iVBORw0K...";
var encodedImage = dataUri.Split(',')[1];
var decodedImage = Convert.FromBase64String(encodedImage);
System.IO.File.WriteAllBytes("signature.png", decodedImage);

Removing empty space around a signature

If you'd like to remove (trim) empty space around a signature, you can do it on the server side or the client side. On the server side you can use e.g. ImageMagic and its trim option: convert -trim input.jpg output.jpg. If you don't have access to the server, or just want to trim the image before submitting it to the server, you can do it on the client side as well. There are a few examples how to do it, e.g. here or here and there's also a tiny library trim-canvas that provides this functionality.

Drawing over an image

Demo: https://jsfiddle.net/szimek/d6a78gwq/

License

Released under the MIT License.

Comments
  • Consider option to remove blank space around signature

    Consider option to remove blank space around signature

    I need to use the sig image later in my app and the blank space around the sig can be a bit of a pain. I added an option to remove this blank space so that the image returned when I get the data is the cropped signature. I'm not sure if this would be useful to others, and I am not able to git at the moment, so I'll just offer it here in case it proves helpful.

        SignaturePad.prototype.removeBlanks = function () {
            var imgWidth = this._ctx.canvas.width;
            var imgHeight = this._ctx.canvas.height;
            var imageData = this._ctx.getImageData(0, 0, imgWidth, imgHeight),
            data = imageData.data,
            getAlpha = function(x, y) {
                return data[(imgWidth*y + x) * 4 + 3]
            },
            scanY = function (fromTop) {
                var offset = fromTop ? 1 : -1;
    
                // loop through each row
                for(var y = fromTop ? 0 : imgHeight - 1; fromTop ? (y < imgHeight) : (y > -1); y += offset) {
    
                    // loop through each column
                    for(var x = 0; x < imgWidth; x++) {
                        if (getAlpha(x, y)) {
                            return y;                        
                        }      
                    }
                }
                return null; // all image is white
            },
            scanX = function (fromLeft) {
                var offset = fromLeft? 1 : -1;
    
                // loop through each column
                for(var x = fromLeft ? 0 : imgWidth - 1; fromLeft ? (x < imgWidth) : (x > -1); x += offset) {
    
                    // loop through each row
                    for(var y = 0; y < imgHeight; y++) {
                        if (getAlpha(x, y)) {
                            return x;                        
                        }      
                    }
                }
                return null; // all image is white
            };
    
            var cropTop = scanY(true),
            cropBottom = scanY(false),
            cropLeft = scanX(true),
            cropRight = scanX(false);
    
            var relevantData = this._ctx.getImageData(cropLeft, cropTop, cropRight-cropLeft, cropBottom-cropTop);
            this._canvas.width = cropRight-cropLeft;
            this._canvas.height = cropBottom-cropTop;
            this._ctx.clearRect(0, 0, cropRight-cropLeft, cropBottom-cropTop);
            this._ctx.putImageData(relevantData, 0, 0);
        };
    

    FYI, credit for most of this code goes to http://stackoverflow.com/questions/12175991/crop-image-white-space-automatically-using-jquery

    I imagine my need for this feature also grows from my using signature_pad on a larger tablet instead of a phone-size device.

    opened by efc 60
  • Capturing biometric data with the sign

    Capturing biometric data with the sign

    Hello.

    Is it possible to get biometric data associated to the sign? I say, writing speed, number of lines, etc. I need to be sure that the user doesn't reject the authenticity of his own sign for legal purposes. This component is the only one I've seen that writes a smooth sign, so I suppose that data is getting captured. The end goal is getting the end user sign + biometric information associated to that sign + legal third-party timestamp; then, encoding the whole pack, and send to the database. Is it possible anyway?

    Thanks a lot.

    enhancement 
    opened by kalihos 58
  • Doesn't seem to support Webpack

    Doesn't seem to support Webpack

    I'm using Webpack to bundle my app and I'm trying to integrate SignaturePad. I tried using import { SignaturePad } from "signature_pad", import "signature_pad", require("signature_pad") and many other variations, with "signature_pad/signature_pad", and even "signature_pad/src/signature_pad", but it seems that Webpack doesn't support the module types that SignaturePad uses.

    The only way I got it to work is using exports-loader: var SignaturePad = require("exports?SignaturePad!signature_pad/src/signature_pad");

    Any plans to add Webpack support? Or am I missing something?

    bug 
    opened by szh 44
  • allow canvas to be resized by CSS

    allow canvas to be resized by CSS

    This adds support for resizing the canvas used for signature pad by CSS.

    Currently the library requires the drawingbuffer size of a canvas to equal it's rendered size. This is a hard limitation cause the drawingbuffer size determines the size of the image returned by toBlob() and toDataURL(). So basically it wasn't possible yet to generate an image with a different size as the signature pad was rendered with.

    A simplified example of an use case that wasn't supported so far is:

    <canvas width="1000" height="500" style="width: 250px; height: 100px"></canvas>
    

    This creates an image with a dimension of 1000x500px but renders it on 250x100px. This is especially useful if application requires fixed dimensions for the signature image created but the canvas should be responsive. It's supported out of the box after this change cause the scaling of the canvas is taken into account when mapping an element position to a position on canvas drawingbuffer.

    While working on that feature I noticed that this also fixes the need for the resize hack. If I didn't missed something the resize hack was only necessary cause this library has taken the assumption that rendered canvas size and drawingbuffer size are equal. That assumption may have been wrong after resize (and in several other scenarios) causing the stroke to be drawn at a wrong position. So the recommended work-a-round was to change drawingbuffer size on resize events. This shouldn't be required anymore.

    Some might to see it as a drawback that the rendered signature pad and the created image, which is returned by toBlob() and toDataURL() may have different ratios. That's the case as soon as drawingbuffer size and rendered size have different ratios. E.g. for <canvas width="1000" height="500" style="width: 1000px; height: 250px;"></canvas> the element would have a rendered ratio of 2:1 (1000x500px) but the generated image would have a 4:1 (1000x250px). Before the usage of signature pad was broken in that cases, so I wouldn't consider it a breaking change but more like a bug fix.

    enhancement 
    opened by jelhan 35
  • fromDataUrl fails on tablet

    fromDataUrl fails on tablet

    Hi,

    I use this awesome lib on my current project and I meet some issue with tablet.

    First of all, all is working fine on desktop browser (mac non-retina, chrome / firefox).

    The problem occured on tablet (nexus 7, android lollipop, Chrome) with fromDataURL: The signature size is shrank on tablet.

    Here is a demo: http://jsbin.com/tixuje/2/edit?html,js,output

    If you open this link: http://jsbin.com/tixuje/2 on desktop, you will see this one: Original signature capture

    When I open this same link: http://jsbin.com/tixuje/2 on my tablet, I get a shrank signature: Shrank signature capture

    Do you know where does the problem?

    bug needs: investigation 
    opened by mathpere 30
  • Cannot Import in TypeScript

    Cannot Import in TypeScript

    According to the description, I should be able to import this module into TypeScript as follows: import * as SignaturePad from 'signature_pad';

    TypeScript refuses to recognize this as valid because there isn't an exported module. Please export a module for TypeScript compatibility.

    Here is a stack overflow topic regarding this.

    needs: more info 
    opened by jamie-thul 24
  • iphone X and 12 issue

    iphone X and 12 issue

    Hi!

    Signature Pad don't work on iphone X and iphone 12, when I try write something I have instant refresh.

    @2.3.2 from cdn.jsdelivr.net/npm/[email protected]/dist/signature_pad.min.js

    thanks for help!

    needs: investigation needs: more info 
    opened by umotivo-official 22
  • Improve drawing quality

    Improve drawing quality

    Issue

    Drawn lines are not very smooth, especially when drawing slowly. Skipping points too close to each other and throttling was supposed to improve it and it did, but not very much.

    How others do it

    Chrome Canvas app

    https://canvas.apps.chrome Doesn't draw lines with variable width, but the lines are very smooth. Seems to be using Ink library.

    iMessage

    Looks like iMessage uses some dark magic and gives much better results than this library. It might be a good idea to experiment a bit to try to achieve similar results.

    iMessage (iPhone 5): imessage

    SignaturePad (iPhone 5): signature-pad

    ezl/signature-pad

    In https://github.com/szimek/signature_pad/issues/319 it has been reported that https://github.com/ezl/signature-pad plugin generates smoother lines; it might be worth looking into it as well

    Some interesting ideas:

    • make width changes smoother, by interpolating velocity along more than just the previous point (?)
    • use more steps to draw a curve to get rid of visible circles (?)
    • check if faster device produces smoother lines (EDIT: it doesn't)
    • try to skip points too close to each other (EDIT: implemented!)
    • https://www.youtube.com/watch?v=H79iUsai6uc / https://github.com/eur00t/Effective-Curve-Fitting
    • https://www.particleincell.com/2012/bezier-splines/

    One of the problems is that changing already drawn curve (even if it's just the last few points), would most likely require to redraw the whole thing...

    Any ideas, suggestions and PRs are welcome ;)

    enhancement needs: investigation 
    opened by szimek 19
  • undefined is not an object (evaluating 'this._data[this._data.length-1].push')

    undefined is not an object (evaluating 'this._data[this._data.length-1].push')

    Hey,

    I'm just raising this for your visibility / in case you have any ideas. I don't have a repro and am not expecting you to be able to do anything to solve this.

    We're getting this error thrown on one of our production apps. We have lots of apps running out there and only one has ever had this issue, which suggests to me it might be device related.

    The error

    undefined is not an object (evaluating 'this._data[this._data.length-1].push')
    

    Is being thrown from here:

    https://github.com/szimek/signature_pad/blob/master/src/signature_pad.js#L173-L178

    That's pretty much all the info I have. The client using the app hasn't reported anything to us from a behaviour perspective.

    Other info:

    • Ionic 3 / Angular 4 app deployed via the AppStore
    • iPad Model: iPad6,11
    • UA: UA: Mozilla/5.0 (iPad; CPU OS 11_0_1 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Mobile/15A402

    I am tracking the issue and will update you if I get further information.

    Thanks for all your hard work on this repo,

    Stephen

    opened by lathonez 18
  • Creating smoother lines by using sampling rate?

    Creating smoother lines by using sampling rate?

    Would it make sense to use a sampling rate to collect data points to create smoother lines?

    The article https://medium.com/square-corner-blog/smoother-signatures-be64515adb33#.vib1pfjh4 Shows data are picked from a sampled touch points.

    I could not see any sampling algorithm in the code. Every touch events seems to be used to draw a line.

    I created his demo with Underscore library, where the sampling rate is every x-milliseconds, this is set to 20 at the bottom of the JS code. http://codepen.io/kunukn/pen/kkbNvx

    enhancement 
    opened by kunukn 18
  • Fix bug when scaling canvas with CSS

    Fix bug when scaling canvas with CSS

    Previously, setting the canvas width and height via CSS "width" and "height" properties would create a scale multiplier that SignaturePad did not account for. This caused the line to show up offset from where the user attempted to draw.

    To reproduce, open in browser and set

    canvas {
        width: 200px;
        height: 100px;
    }
    

    with those widths and heights differing from the actual canvas width and height. Then attempt to draw.

    With this commit, the scale multiplier is taken into account, and scaling the canvas with CSS works just fine, with drawn lines appearing directly under the cursor.

    STILL NEEDS MINIFICATION

    enhancement needs: investigation 
    opened by richardcpeterson 18
  • ToDataUrl size not working on touchscreen devices

    ToDataUrl size not working on touchscreen devices

    Context We're developing an application where we use your library to sign with a mobile phone, and then send the signature to our web application.

    We send the data encoded with

    var data = signaturePad.toDataURL("image/svg+xml")
    

    and then we draw it in a smaller canvas (with the same ratio) with :

    anotherSignaturePad.fromDataURL(data, {
        width: 400,
        height: 200
      });
    

    When we implemented this feature we used version 4.0.7 We updated to version 4.1.4 and the feature isn't working anymore (the bug appeared on version 4.0.8)

    This bug only happens in touchscreen devices.

    What is the expected behavior? The behavior we had in version 4.0.7 version_4 0 7

    What is the current behavior? The behavior in version 4.0.8 and higher version_4-1-4

    Details

    We tried with an iPhone SE (2nd generation, iOS 15) and with a Microsoft surface

    The yellow canvas correspond to the touchscreen device and the green one to the web application on the computer.

    We are using Firefox 102.1.0esr.

    Here is the fiddle with version 4.0.7

    Here is the fiddle with version 4.1.4

    In any case, thanks in advance and for your work. The library is very helpful !

    opened by valentinoroth 7
  • width and height of an SVG is wrong because of window.devicePixelRatio

    width and height of an SVG is wrong because of window.devicePixelRatio

    What is the current behavior? When downloading a canvas with toSVG() method, its ratio is incorrect, which leads to cutting off part of the image.

    What is the expected behavior? Developer can pass devicePixelRatio to toSVG() method as paramter, in order to capture whole canvas independent of its size. The window.devicePixelRatio on my device is 2. That is why the image is cropped. If I set it to 1 through console, the image is correct.

    Which versions of SignaturePad, and which browser / device are affected by this issue? Did this work in previous versions of SignaturePad? Signature pad: 4.1.4 Chrome 107.0.5304.110 MacBook Pro 16' 2021

    Repro:

    1. open attached minimal Angular project
    2. npm install
    3. npm run start
    4. draw on canvas and press "save"
    5. downloaded SVG is cropped and part of image is cut off because of wrong ratio

    untitled.zip

    Video with repro:

    https://user-images.githubusercontent.com/34266035/201952774-359ea6ff-3a80-4e4d-9249-cc7acd567421.mov

    invalid 
    opened by dnlrbz 1
  • Showcase ability to change backgroundColor on the demo

    Showcase ability to change backgroundColor on the demo

    Do you want to request a feature or report a bug? Feature

    What is the current behavior? Is not very obvious that the background can be changed on the fly. Took me a little to figure it out

    What is the expected behavior? Add a "change background" button on the demo that will call something like

    signaturePad.backgroundColor = 'rgb(x,x,x)';
    signaturePad.fromData(signaturePad.toData()) 
    

    With a random color.

    Someone reading and finding this issue might think is not that easy.

    good first PR docs 
    opened by rodrigoaguilera 0
  • Page is scrolling around when trying to sign

    Page is scrolling around when trying to sign

    version: Signature Pad v4.0.3 iPhone SE using iOS 15.4.1

    This issue only seems to occur in the iOS application. The only place I experience the page scrolling up and down while I’m trying to sign is in in the iOS application.

    • There is no specific part of the screen that it happens on. You can touch anywhere, and it will treat your touch like you’ve grabbed the page to scroll. The “ink” still shows up as I’m trying to sign, but because the page also scrolls at the same time with my movement it makes it impossible to write a clear signature.
    needs: investigation 
    opened by joanrotbard 6
  • incorrect scaling/offset when using css zoom on a parent element (e.g. page)

    incorrect scaling/offset when using css zoom on a parent element (e.g. page)

    when using e.g. 'zoom: 1.5' as style on the main document (body/html/content/etc), the scaling and offset is corrupted and with the example resize snippet I'm not able to manage to compensate this as it results in both a corrupt offset and corrupt scale.

    strangely, manual zooming in and out in the browser (ctrl-+ and ctrl--) does not result in corrupt behaviour after resize/refresh.

    bug wontfix 
    opened by koenhandekyn 13
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