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Placeholder Image Generator

Create a custom-size PNG placeholder with your colors and label instantly, entirely in the browser.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Enter the exact output width and height in whole pixels.
  2. 2.Choose background and text colors, then optionally replace the default dimension label.
  3. 3.Select Create placeholder, verify the reported size, and download the PNG.

About Placeholder Image Generator

Placeholder Image Generator creates a real downloadable PNG for an empty layout slot, wireframe, prototype, fixture, or content mockup. Enter the required width and height, choose background and text colors, optionally type a short label, and create the image. If the label is blank, the image displays its dimensions automatically, such as 1200 × 630. Everything is drawn and encoded locally in the browser, so no project name, draft copy, or generated image is sent to a server.

Dimensions are entered as whole pixels from 1 to 10,000 per side, subject to a 40-megapixel total canvas budget. The limit allows common social preview, website, presentation, and high-resolution mockup sizes while preventing an accidental input from allocating an unsafe canvas. The downloaded file uses exactly the validated width and height. The preview may be visually scaled to fit the page, but that display size never changes the PNG's natural resolution.

The default label is computed from the output dimensions only after validation. A custom label is trimmed, limited to 80 Unicode characters, centered horizontally and vertically, and drawn with the browser's system sans-serif font. Font size scales from the shorter image dimension with a minimum of 12 pixels and a maximum of 96 pixels. If a custom label is still too wide, it is shortened on the rendered image with an ellipsis rather than overflowing outside the canvas.

Colors use six-digit hexadecimal values selected with native browser color controls. The background is painted first across the entire canvas, followed by the label in the selected foreground color. The tool does not silently adjust contrast, add a gradient, introduce transparency, or alter the supplied colors. That makes it deterministic for a design token such as #e5e7eb, but it also means the user should choose a readable foreground and background combination.

The output is a PNG named placeholder-WIDTHxHEIGHT.png. PNG is used because it is broadly supported, renders text and flat color cleanly, and gives the file a stable format independent of the browser's JPEG quality behavior. The result line reports the exact dimensions, the label actually rendered, and the approximate file size. A downloadable object URL is replaced and revoked whenever an input changes, preventing a stale preview from being mistaken for the current settings.

This generator is useful when a local asset is preferable to a third-party placeholder URL. A local PNG keeps prototypes working offline, avoids leaking page visits to an image host, and cannot change because an external placeholder service changed its response. It can also create stable screenshot-test fixtures when a known dimension and flat background are more useful than a decorative stock image.

The tool deliberately does not fetch remote images, add stock photography, generate AI artwork, create responsive srcset variants, choose platform-specific recommended sizes, or claim that a particular dimension is correct for a social network. It creates exactly the pixels requested. For production photography, branded artwork, vector files, or accessibility-aware text composition, use the appropriate design workflow and provide meaningful page-level alternative text when the final image is published.

Methodology & sources

Parse bounded whole-pixel dimensions, enforce a 40-megapixel canvas budget, normalize six-digit colors, choose a dimension label when custom text is blank, cap label length and font size, paint the background and centered text on a natural-size canvas, encode PNG, and revoke stale output URLs.

Frequently asked questions

What text appears if I leave the label empty?
The tool centers the validated width and height, for example 1200 × 630.
Does the preview change the download resolution?
No. The preview is only scaled for the page; the PNG keeps the exact width and height you entered.
Are my dimensions, colors, or label uploaded?
No. Canvas drawing, PNG encoding, preview, and download creation run locally in your browser.
Does the tool choose recommended social media sizes?
No. It avoids time-sensitive platform presets and creates exactly the dimensions you request.

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