Generate custom placeholder images with any dimensions, background color, text color, and label. Download as PNG or use as data URL.
Dimensions
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About Image Placeholder Generator
Generate placeholder images of any size for use in mockups, wireframes, and prototypes. Customize the background color, text color, label, and font size. Download as PNG or copy as a data URL for direct inline use in HTML.
Common Use Cases
Wireframes - placeholder images before real assets are ready · Email templates - test layouts with correctly-sized placeholders · CMS previews - test image slots with exact required dimensions · Documentation - illustrate image size requirements
Frequently Asked Questions
Yes - copy the data URL and use it as the src attribute of an <img> tag. No file is needed. Note that large images will produce very long data URLs, so for images above a few hundred pixels it's better to download and serve as a file.
OG Image refers to the Open Graph image - the image shown when a URL is shared on social media platforms like Twitter, Facebook, and LinkedIn. The standard recommended size is 1200×628 pixels.
The maximum is 2000×2000 pixels in this tool. Very large canvas sizes may use significant browser memory. For images above 1920×1080, the download PNG option is recommended over the data URL, as it will be an extremely long string.
Yes - use the Custom Label field to show any text on the placeholder (e.g. "Hero Image", "Profile Photo", "Product Shot"). Leave it blank to show the dimensions automatically.
About Image Placeholder Generator — Image Placeholder Generator Online
The Image Placeholder Generator creates custom placeholder images instantly for use in web development, UI design, prototyping, and content mockups. Set any width and height in pixels, choose a background color and text color, add a custom label, and the placeholder image is rendered live on a canvas. No server, no upload, no account — your image placeholder generator online experience is fully private and instant.
Web developers use placeholder images throughout the build process: before final photography arrives, while testing responsive layouts, or when building CMS templates that need images of specific dimensions. Designers use them in wireframes and presentations to indicate where real images will eventually appear. Email marketers test their templates with exact pixel-perfect placeholder images before swapping in final assets. This tool covers all those needs in one place, with instant download as PNG, JPEG, or WebP.
How to Use the Image Placeholder Generator
Enter the desired Width and Height in pixels using the number inputs, or click one of the preset size buttons (such as 400×300, 1920×1080, OG Image, or Story 9:16) to fill in standard dimensions automatically.
Click the Background color picker to choose the fill color for the placeholder. The default is a neutral light gray.
Click the Text Color picker to choose the color for the label text overlaid on the placeholder.
Optionally type a Custom Label in the text field — for example "Hero Image", "Product Photo", or "Avatar". If you leave it blank, the placeholder will display its dimensions automatically (e.g., "400 × 300").
Choose an output format (PNG, JPEG, or WebP) from the dropdown, then click Download to save the file, or use the Copy Data URL or Copy <img> tag buttons to copy the image directly into your code.
Size Presets and Supported Formats
The tool includes a set of one-click presets for the most common placeholder dimensions used in web and social media projects.
Standard sizes: 400×300, 800×600, and 1920×1080 cover common thumbnail and desktop hero image dimensions used in web layouts and HTML email templates.
OG Image (1200×628): The standard Open Graph image size recommended by Facebook, LinkedIn, and most social platforms for link preview thumbnails. Use this preset when generating a placeholder for your page's og:image meta tag.
Square 1080 (1080×1080): Standard square format for Instagram posts. Use this when designing social media content templates that need square image slots.
Story 9:16 (1080×1920): Vertical full-screen format for Instagram Stories, TikTok, and Snapchat. Essential for mobile-first design templates.
Ad banners (300×250 and 728×90): IAB standard Medium Rectangle and Leaderboard ad sizes, useful for ad placement mockups and website layout testing.
Avatar (100×100) and Favicon (16×16): Small square formats for profile images and browser tab icons.
Tips for Getting the Best Results
Small adjustments to how you use the generator can significantly speed up your workflow.
Use labels to identify image slots in mockups: Instead of leaving the default dimensions label, type a descriptive label like "Product Hero" or "Blog Thumbnail" so that when you present a mockup to a client or teammate, each placeholder is clearly identified without relying on annotations.
Match your brand colors in prototypes: Set the background color to your brand's primary color and the text color to white to create placeholders that feel more like real content in a high-fidelity mockup. This helps stakeholders visualize the final design more accurately.
Copy the <img> tag for immediate use in HTML: The Copy <img> tag button generates a complete HTML img element with the data URL as the src attribute and the correct width and height attributes. Paste it directly into your HTML file for an instantly working placeholder that requires no external file.
Use WebP for the smallest file size: When exporting placeholders that will be checked into a repository or included in a design file package, WebP produces the smallest file size at equivalent visual quality. For compatibility with older tools, PNG is the safest default.
Adjust font size for very small or very large images: The font size auto-scales based on the smaller of the width and height, but for unusual aspect ratios (very wide and short, or very tall and narrow), you can override the font size manually using the Font Size input to ensure the label fits cleanly.
Why Use an Image Placeholder Generator Online
Generating placeholder images without an online tool typically requires opening a design application, creating a new canvas, filling it with a color, adding a text label, and exporting — a process that can take several minutes per image. An online generator reduces this to under ten seconds. Because this tool uses the HTML Canvas API to render the image client-side, there is no server round-trip, no file upload, and no account management needed. It works on any operating system in any modern browser.
Developers, designers, and content managers all benefit from fast placeholder generation. Teams using component-based UI frameworks like React or Vue regularly need identically sized placeholder images to test responsive grid layouts. Email developers need precise dimensions to test Outlook and Gmail rendering. This tool fits into all those workflows without friction.
Frequently Asked Questions about Image Placeholder Generator
The tool input fields allow up to 2000×2000 pixels. Very large canvases may use significant browser memory. For images larger than 1920×1080, the Download button is recommended over the Copy Data URL option, as very large data URLs become extremely long strings that can slow down or crash some browsers and editors when pasted.
Yes. Calculate your required pixel dimensions based on your print DPI. For example, a 4×6 inch image at 300 DPI needs a canvas of 1200×1800 pixels. Enter those dimensions, download as PNG, and use the file in your print layout application. The PNG will be lossless and suitable for print-resolution mockups.
This tool generates downloadable files and data URLs rather than hosted image URLs. For URL-based placeholder images where you need a hot-linkable src attribute pointing to an external service, services like via.placeholder.com or placehold.co provide that. This tool is better suited when you need to download placeholder files or embed them directly as data URLs in HTML or CSS.
No. Every aspect of image generation runs entirely in your browser using the HTML Canvas API. No image data, no dimensions, and no color values are ever transmitted to Oneyfy's servers. The tool generates the image locally and your download is a direct browser-to-disk file save.
Yes, completely free. There is no account, no subscription, no usage limit, and no watermark added to the generated images. You can generate as many placeholder images as you need for personal or commercial projects at no cost.
An OG Image (Open Graph image) is the preview image displayed when a URL is shared on social media platforms like Facebook, LinkedIn, Twitter/X, and Slack. The widely recommended size is 1200×628 pixels at a 1.91:1 aspect ratio. Using the correct dimensions ensures your link preview fills the preview card without cropping. The OG Image preset in this tool generates exactly those dimensions.
Yes. Click "Copy Data URL" to copy the full base64-encoded data URL of the image, then use it as the src attribute of an img tag in your HTML. Alternatively, click "Copy <img> tag" to get a complete, ready-to-paste img element with the correct width and height attributes already set. This is ideal for rapid prototyping where you want placeholder images working immediately in a code file without managing separate image assets.
Yes. The tool is responsive and works on smartphones and tablets in modern mobile browsers. The layout switches to a single column on small screens. The canvas rendering and download functions work on iOS Safari and Chrome for Android. For very large canvas sizes, mobile devices may be slower due to memory constraints.