Placeholder.it – Online image placeholder service
With this service, you set your dimensions more traditionally, rather than separating the widths and heights into segments.
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Image Format ( .gif, .jpeg, .jpg, .png )
Adding an image file extension will render the image in the proper format. Image format is optional and the default is a gif. jpg and jpeg are the same. The image extension can go at the end of any option in the url.
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Custom Text ( &text = Hello+World )
Custom text can be entered using a query string at the very end of the url. This is optional, default is the image dimensions (300×250). A-z (upper and lowercase), numbers, and most symbols will work just fine.
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Colors ( background color / text color )
Colors are represented as hex codes (#ffffff is white).
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Size ( width x height )
Height is optional, if no height is specified the image will be a square.
Source : placehold.it