Placeholder Image Generator
100% private — runs on your device, never uploaded. Works offline once loaded.
Create a custom placeholder image at any size with your own colours and label, then download it as a PNG. Everything is drawn in your browser.
Placeholder images for mockups and prototypes
When you are building a layout, you often need an image of a specific size before the real artwork exists. A placeholder image fills that gap: a solid rectangle at exact dimensions, usually labelled with its own width and height so you can see at a glance what slot it belongs to. Designers and developers use them for wireframes, component demos, email templates, and documentation screenshots.
This generator draws the image on an HTML canvas and lets you download a real PNG file. That means you can drop it straight into a design file, a Storybook story, or a static site without depending on an external placeholder URL that might go down or require a network request.
Full control over size and colour
Set any width and height up to 4000 pixels each. Pick a background colour and a text colour with the native colour pickers, and the preview updates live as you type. By default the label shows the dimensions in the familiar WIDTH×HEIGHT form, but you can replace it with any text — a component name, a caption, or a note like "hero image".
The font size scales automatically to suit the smaller dimension, so a wide banner and a small square both stay readable. If you need something specific, enter an exact font size in pixels to override the automatic value.
An optional diagonal marker
Turn on the diagonal marker to draw two crossing lines from corner to corner. This classic wireframe convention makes it obvious that a box is a placeholder rather than final content, which helps during reviews so nobody mistakes a grey rectangle for the finished design.
The marker is drawn semi-transparent in your chosen text colour so it reads clearly on both light and dark backgrounds.
How the PNG is produced
The tool paints the background, optional marker, and centred label onto a canvas element sized to your exact pixel dimensions, then exports it with the browser's built-in canvas.toBlob() as a lossless PNG. Because this happens entirely on your device, generation is instant and completely private — nothing about your image, colours, or label is sent anywhere. The downloaded file is named with its dimensions, for example placeholder-600x400.png, so your assets stay organised.
Frequently asked questions
Can I make transparent placeholders?
The generated PNG uses the solid background colour you choose. For a transparent look, pick a background that matches your page, since the canvas export fills the whole area.
Why is my label cut off?
Very long labels are automatically scaled to fit within the image width. If it is still tight, increase the width or lower the font size so the text has room.
Can I generate retina (2x) assets?
Yes. Just enter the pixel dimensions you need — for a 300×200 slot at 2x, set the width and height to 600×400 and scale it down in your layout.
Does it work on mobile?
Yes. The tool runs in any modern browser, and the colour pickers use your device's native colour selection interface.
Are my colours or labels stored?
No. Nothing is saved or transmitted. Every setting lives only in the current page and is gone when you close the tab.
Can I get a JPEG instead of PNG?
The download is PNG, which is ideal for flat placeholder graphics with sharp text. You can convert it to JPEG afterwards with an image converter if you need that format.
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