About

This tool is a client-side powerhouse for designers and developers who require instant, high-fidelity placeholder assets without relying on external CDNs or bandwidth-heavy requests. By leveraging the browser's Canvas API, it generates pixel-perfect binaries locally, ensuring zero latency and absolute privacy.

Unlike basic generators, this engine handles complex rendering logic including automatic text wrapping, perceptual contrast adjustment, and procedural noise generation. It solves the common pain point of illegible text on dark backgrounds by utilizing the YIQ color space algorithm to dynamically determine the optimal font color. Whether you are wireframing a responsive layout, testing a CMS, or building a prototype, this tool provides the exact dimensions and formats required by modern web standards.

Formulas

To ensure text legibility against any background color, the tool calculates the YIQ Contrast Value. This converts the RGB color space into a luma value (brightness) to decide between black or white text.

YIQ = (R × 299) + (G × 587) + (B × 114)1000

If YIQ ≥ 128, the background is bright, so the text color (C_text) is set to black. Otherwise, it is white:

{

Black if YIQ ≥ 128White otherwise

Reference Data

Standard	Name	Dimensions (px)	Aspect Ratio
IAB Standard	Medium Rectangle	300 × 250	1.2:1
IAB Standard	Leaderboard	728 × 90	8.09:1
IAB Standard	Wide Skyscraper	160 × 600	1:3.75
IAB Standard	Large Rectangle	336 × 280	1.2:1
IAB Standard	Billboard	970 × 250	3.88:1
Social Media	Instagram Post	1080 × 1080	1:1
Social Media	Instagram Story	1080 × 1920	9:16
Social Media	Twitter Card (Large)	800 × 418	1.91:1
Social Media	Facebook Cover	820 × 312	2.63:1
Social Media	YouTube Thumbnail	1280 × 720	16:9
Video	SD (480p)	640 × 480	4:3
Video	HD (720p)	1280 × 720	16:9
Video	Full HD (1080p)	1920 × 1080	16:9
Video	4K UHD	3840 × 2160	16:9
Devices	iPhone SE	375 × 667	9:16
Devices	iPhone 14 Pro	393 × 852	1:2.17
Devices	iPad Mini	768 × 1024	3:4

Frequently Asked Questions

The generator includes an algorithmic text wrapper. It measures the width of your custom text against the canvas width (minus padding). If a word exceeds the remaining line width, it pushes the text to a new line automatically, adjusting the vertical centering dynamically.

Yes. Pure colors compress extremely well in PNG and JPEG formats. Adding procedural noise introduces high-frequency pixel variations, which reduces the efficiency of compression algorithms (especially DEFLATE in PNG), resulting in larger file sizes. Use noise sparingly if bandwidth is a concern.

To maintain visual balance, the font size is calculated as a function of the smallest dimension of the image (min(width, height) * 0.15). This ensures the text remains proportional whether you generate a 50px icon or a 4000px billboard.

No. This tool generates images locally in your browser (Data URIs or Blobs). It does not host the image on a server. You must download the file or copy the Base64 string to embed it directly in your HTML.