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HTML

              
                <div class="upload"><input type="file" name="file" id="file"></div>
<canvas id="canvas"></canvas>
<div id="result"></div>
              
            
!

CSS

              
                
              
            
!

JS

              
                var file = document.getElementById('file');
var canvas = document.getElementById('canvas');
var canvasWidth = 400;
var canvasHeight = 300;
var uploadImgSrc;

// Canvasの準備
canvas.width = canvasWidth;
canvas.height = canvasHeight;
var ctx = canvas.getContext('2d');

function loadLocalImage(e) {
	// ファイル情報を取得
	var fileData = e.target.files[0];

	// 画像ファイル以外は処理を止める
	if(!fileData.type.match('image.*')) {
		alert('画像を選択してください');
		return;
	}

	// FileReaderオブジェクトを使ってファイル読み込み
	var reader = new FileReader();
	// ファイル読み込みに成功したときの処理
	reader.onload = function() {
		// Canvas上に表示する
		uploadImgSrc = reader.result;
		canvasDraw();
	}
	// ファイル読み込みを実行
	reader.readAsDataURL(fileData);
}

// ファイルが指定された時にloadLocalImage()を実行
file.addEventListener('change', loadLocalImage, false);

// Canvas上に画像を表示する
function canvasDraw(imgSrc) {
	// canvas内の要素をクリアする
	ctx.clearRect(0, 0, canvasWidth, canvasHeight);

	// Canvas上に画像を表示
	var img = new Image();
	img.src = uploadImgSrc;
	img.onload = function() {
		ctx.drawImage(img, 0, 0, canvasWidth, this.height * (canvasWidth / this.width));

		// Canvas上にテキストを表示
		addText();

		// canvasを画像に変換
		var data = canvas.toDataURL();

		// 画像として出力
		var outputImg = document.createElement('img');
		outputImg.src = data;
		document.getElementById('result').appendChild(outputImg);
	}
}

// Canvas上にテキストを表示する
function addText() {
	ctx.fillStyle = '#fdd000';
	ctx.fillRect(10, 10, 140, 30);

	ctx.font = "bold 20px 'MS Pゴシック'";
	ctx.textAlign = 'center';
	ctx.textBaseline = 'middle';
	ctx.fillStyle = '#002B69';
	ctx.fillText('株式会社TAM', 80, 25);
}
              
            
!
999px

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