Add filename to photos

There are many script to add file name text layers.

// This script was hacked by JJMack 
// This script is supplied as is. It is provided as freeware.
// The author accepts no liability for any problems arising from its use.
// LowerLeftFileName.jsx
// enable double-clicking from Mac Finder or Windows Explorer
#target photoshop // this command only works in Photoshop CS2 and higher
// bring application forward for double-click events
app.bringToFront();
if (!documents.length) {alert('There are no documents open.', 'No Document');} // ensure at least one document open
else { main();}

///////////////////////////////////////////////////////////////////////////////
// main - main function
///////////////////////////////////////////////////////////////////////////////
function main() {
	/* Internal Photoshop Text name								*/								
    var fontName = "ArialMT";
	var fontName = "TimesNewRomanPSMT";
	var fontName = "Tahoma";
	/* Text Color										*/
	textColor = new SolidColor;						
	textColor.rgb.red = 255;
	textColor.rgb.green = 0;
	textColor.rgb.blue = 0;
	/* END Variables You can hard here */

    // remember users Ruler avd Type Units and set ours
	var strtRulerUnits = app.preferences.rulerUnits;
	var strtTypeUnits = app.preferences.typeUnits;
	app.preferences.rulerUnits = Units.PIXELS;
 	app.preferences.typeUnits = TypeUnits.PIXELS;
    var testres = 72;
	res = app.activeDocument.resolution;
	if(res!=testres){ app.activeDocument.resizeImage(app.activeDocument.width.value,app.activeDocument.height.value,testres); }

	var docName = app.activeDocument.name;
	var doc = app.activeDocument;

	text_layer = doc.artLayers.add();							// Add a Layer
	text_layer.name = docName;									// Name Layer
	text_layer.kind = LayerKind.TEXT;							// Make Layer a Text Layer
	text_layer.textItem.color = textColor;						// set text layer color
/* Do not set TextType to Pargarph Text so action can position text layer
	text_layer.textItem.kind = TextType.PARAGRAPHTEXT;			// Set text layers text type
 */
	text_layer.textItem.font = fontName;						// set text font
	text_layer.blendMode = BlendMode.NORMAL						// blend mode
	text_layer.textItem.fauxBold = false;						// Bold
	text_layer.textItem.fauxItalic = false;						// Italic
	text_layer.textItem.underline = UnderlineType.UNDERLINEOFF;	// Underlibn
	text_layer.textItem.capitalization = TextCase.NORMAL;		// Case
	text_layer.textItem.antiAliasMethod = AntiAlias.SHARP;		// antiAlias
    if (doc.width>=1001) fontSize = 60;
	else fontSize = 10;
	text_layer.textItem.size = fontSize;						// set text font Size
	text_layer.textItem.position = Array(fontSize, (doc.height - fontSize ));	// set text layers position in and down 

	try{
        text_layer.textItem.contents = decodeURI(app.activeDocument.fullName);
	}
	catch (er) {
		text_layer.textItem.contents = activeDocument.name; 
		//alert("Error Setting Contents...");
	}
	if(res != testres){ app.activeDocument.resizeImage(app.activeDocument.width.value,app.activeDocument.height.value,res); }	
	app.preferences.rulerUnits = strtRulerUnits;
	app.preferences.typeUnits = strtTypeUnits;
}
///////////////////////////////////////////////////////////////////////////////
// END - main function
///////////////////////////////////////////////////////////////////////////////