ToolForge

プレースホルダー画像生成

Placeholder image generator: create images by size, background, text and format with bulk and preview for design dev, with one-click copy, offline and multilingual.

使い方

サイズ・文字・色を設定し「生成」でプレビュー・ダウンロード。

Overview

Placeholder Image Generator is a Design tool. Create images by size, background, text and format with bulk and preview for design dev, with one-click copy, offline and multilingual. It runs 100% in your browser with no upload, so you get instant results with privacy. Whether you need a quick answer or batch processing with precise control, you can enter, validate and export in seconds. The UI is responsive on mobile, tablet and desktop and supports one-click copy.

Use cases

  • Daily use of Placeholder Image Generator: Set size, text and colors, then generate and download the placeholder. — enter and get instant results without manual lookup.
  • One-click copy keeps results ready to save, check or share with family and pros.
  • Use Placeholder Image Generator offline or on poor network — all calculations stay local and private.
  • Pick color-blind-friendly sequences for charts and dashboards
  • Experiment with gradients and shadows for illustrations and video

How to use

  1. 1 Set size, text and colors, then generate and download the placeholder..
  2. 2 Switch color spaces and watch live preview and contrast scores
  3. 3 Copy results as CSS, Tailwind or design-token formats
  4. 4 Export palettes as ASE/JSON for Figma or Photoshop

Highlights

  • Local & private: processing stays in your browser
  • Live validation with tolerant parsing
  • One-click copy and export for docs, code or sheets
  • Batch and offline support under poor network

Notes

  • Displays vary—verify critical colors on target devices
  • Alpha affects blended contrast; re-check on final background
  • Export large palettes in batches to avoid memory spikes

FAQ

Why does contrast fail?
Foreground/background luminance is too close—aim for at least 4.5:1 for body text.
Is conversion lossy?
No. Conversions use standard sRGB/HSL/HSV formulas with high precision.
How is Placeholder Image Generator different?
It runs locally with a focus on speed and privacy, plus tolerant parsing for “placeholder” and one-click copy for reuse.
Can I use results in official reports?
Use it as a working draft and cross-check with authoritative sources; keep the exported log and parameters for traceability.
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