how to save canvas as png image?

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I have a canvas element with a drawing in it, and I want to create a button that when clicked on, it will save the image as a png file. So it should open up the save, open, close dialog box...

I do it using this code

var canvas = document.getElementById("myCanvas");
window.open(canvas.toDataURL("image/png"));

But when I test it out in IE9, a new window opens up saying "the web page cannot be displayed" and the url of it is:

data:image/png;base64,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

Anyone know how to fix this?

try this:

var c=document.getElementById("alpha");
var d=c.toDataURL("image/png");
var w=window.open('about:blank','image from canvas');
w.document.write("<img src='"+d+"' alt='from canvas'/>");

This shows image from canvas on new page, but if you have open popup in new tab setting it shows about:blank in address bar.

EDIT:- though window.open("<img src='"+ c.toDataURL('image/png') +"'/>") does not work in FF or Chrome, following works though rendering is somewhat different from what is shown on canvas, I think transparency is the issue:

window.open(c.toDataURL('image/png'));

how to save canvas as png image?, When the user chooses Save as in the context menu, the browser will show a file dialog, allowing the user to save the canvas visual to his computer. mirror. addEventListener('contextmenu', function (e) { var dataURL = canvas. toDataURL('image/png'); mirror. After the execute this code you will see the link as text “click here” at bottom of the html page. click on this link and open the canvas drawing as a PNG image in new window save the image.

FileSaver.js should be able to help you here.

var canvas = document.getElementById("my-canvas");
// draw to canvas...
canvas.toBlob(function(blob) {
    saveAs(blob, "pretty image.png");
});

Saving HTML5 canvas as image, Paint by pressing your mouse and moving it. Download with the button below. 2. <canvas></canvas>. 3. ​. JavaScript + jQuery Compat (edge) Tidy. xxxxxxxxxx. I want to convert canvas content to a bitmap or other image, and then do other operations, such as rotating or scaling the image, or changing its coordinates. Bitmaps can improve efficiency to show if I am no longer drawing.

I used this solution to set the file name:

HTML:

<a href="#" id="downloader" onclick="download()" download="image.png">Download!</a>
<canvas id="canvas"></canvas>

JavaScript:

function download(){
    document.getElementById("downloader").download = "image.png";
    document.getElementById("downloader").href = document.getElementById("canvas").toDataURL("image/png").replace(/^data:image\/[^;]/, 'data:application/octet-stream');
}

Save Canvas as Image - JSFiddle, The method can take two optional parameters canvas.toDataURL(type, encoderOptions) : type is the image format (if omitted the default is image/png );  I'm currently building a HTML5 web app/Phonegap native app and I can't seem to figure out how to save my canvas as an image with canvas.toDataURL(). Can somebody help me out? Here's the code, what's

I had this problem and this is the best solution without any external or additional script libraries: In Javascript tags or file create this function: We assume here that canvas is your canvas:

function download(){
        var download = document.getElementById("download");
        var image = document.getElementById("canvas").toDataURL("image/png")
                    .replace("image/png", "image/octet-stream");
        download.setAttribute("href", image);

    }

In the body part of your HTML specify the button:

<a id="download" download="image.png"><button type="button" onClick="download()">Download</button></a>

This is working and download link looks like a button. Tested in Firefox and Chrome.

html5-canvas, To save the canvas drawing as an image, we can set the source of an image object to the image data save canvas image as data url (png format by default) So after stumbling upon a nice inspiration for a banner image, I decided to make a custom banner for each of my blog posts. The banner is a PNG image, and to keep the post focused on the subject (“how to create and save an image with Node.js and Canvas”) I’ll skip some parts.

I maybe discovered a better way for not forcing the user to right click and "save image as". Live draw the canvas base64 code into the href of the link and modify it so the download will start automatically. I don't know if it's universally browser compatible, but it should work with the main/new browsers.

var canvas = document.getElementById('your-canvas');
    if (canvas.getContext) {
        var C = canvas.getContext('2d');
    }

$('#your-canvas').mousedown(function(event) {
    // feel free to choose your event ;) 

    // just for example
    // var OFFSET = $(this).offset();
    // var x = event.pageX - OFFSET.left;
    // var y = event.pageY - OFFSET.top;

    // standard data to url
    var imgdata = canvas.toDataURL('image/png');
    // modify the dataUrl so the browser starts downloading it instead of just showing it
    var newdata = imgdata.replace(/^data:image\/png/,'data:application/octet-stream');
    // give the link the values it needs
    $('a.linkwithnewattr').attr('download','your_pic_name.png').attr('href',newdata);

});

You can wrap the <a> around anything you want.

HTML5 Canvas Save Drawing as an Image, var canvas = document.getElementById('canvas'); var dataURL = canvas.​toDataURL(); console.log(dataURL); // "data:image/png;base64  To save the canvas drawing as an image, we can set the source of an image object to the image data URL. From there, a user can right click on the image to save it to their local computer. Alternatively, we could also open up a new browser window with the image data url directly and the user could save it from there.

HTMLCanvasElement.toDataURL(), $data = base64_decode ( $img );. $file = UPLOAD_DIR . uniqid() . '.png' ;. $​success  You can save a canvas to an image file by using the method canvas.toDataURL (), that returns the data URI for the canvas' image data.

How to save an HTML 5 Canvas as an image on the server , A tutorial about how to draw images on HTML5 canvas, and how to save the <​h1>Save Image</h1> <img src="dynamsoft_logo_black.png"  In HTML5, there is a new tag <canvas>, which is used to draw graphics via JavaScript. In this tutorial, I would like to share how to draw images on canvas, and how to save the canvas data to local disk by clicking button.

How to Use JavaScript to Save Canvas Data in Chrome, In this video I'll be showing you how to convert an HTML5 Canvas into a downloadable or Duration: 10:15 Posted: May 27, 2019 How to save the canvas. To save the canvas you are working on, with the canvas you want to save displayed, click “File” → “Save” in the menu. At this time, if the canvas you are working on has never been saved, you will see a dialog box for specifying the location and file name of the file. This is called new preservation. Caption.

Comments
  • possible duplicate of How to save svg canvas to local filesystem
  • it crashes on this command: var w=window.open('about:blank','image from canvas');
  • i changed it to this: var w=window.open('about:blank');, and now the image opens up in a new window, but how do I get it so that its a save close box, i don't want to have to right click the image and hit save as...
  • There is a lot that doesn't work in IE9 :-( Quite a bit can be fixed with polyfills but I am afraid this is beyond that. If you can I suggest using Google Chrome Frame for users using IE.
  • @VagueExplanation toBlob() is not supported on Safari. But a simple polyfill can be found here: developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/…
  • Unfortunately, in IE 11 it clears the screen and changes the url to: data:image/octet-stream;base64,iVBORw
  • After SO much time looking for a solution, THIS is the one that worked for me. On Firefox 76.0.1 (64-bit), which is what I'm using. I should check other browsers but I sure hope that anything up-to-date would still work.
  • This works nicely, except the JavaScript function canvas.toDataUrl(...) should be canvas.toDataURL(...).