API Reference Examples Integrations Troubleshooting

Imageslot FAQ & Help Center

Your comprehensive guide to everything Imageslot: API usage, integrations, troubleshooting, advanced image handling, and best practices. Find expert answers, actionable solutions, and step-by-step walkthroughs for all your placeholder image and API needs.

A team collaborating on a web project with code, UI mockups, and image placeholders visible on screens

API & Authentication

Imageslot's placeholder API is public and does not require authentication or an API key for standard usage. Simply construct your image URL using the /v1/{width}x{height} path and your desired query parameters (e.g., ?bg=173559&fg=fff&filetype=png).

Step-by-step:
  1. Visit the API Reference for all supported options.
  2. Build your URL: https://imageslot.com/v1/600x400?bg=173559&fg=fff&filetype=png
  3. Use the URL in your code, app, or design tool. No API key or token is required.
For advanced/commercial API access or high-volume use, see our documentation for future options.

You can control size, colors, text, format, font, and more using URL parameters. Common parameters include bg (background color), fg (text color), shadow (shadow color), text, fontsize, bold, italic, and filetype.

Example:
https://imageslot.com/v1/800x300?bg=1A726B&fg=fff&text=Demo&shadow=3DA35D&fontsize=44&bold=1&filetype=jpg
See the API Reference for a complete list and advanced usage examples.

Imageslot is designed for developer and designer convenience, with generous usage for most cases. However, to prevent abuse, there are practical rate limits for extremely high-frequency calls (e.g., automated scripts or scraping). For standard web/app/design use, you are unlikely to hit a limit.

If you anticipate high-volume or commercial traffic, please review the documentation or consider self-hosting for guaranteed unlimited throughput.

Yes, all Imageslot endpoints use HTTPS and support CORS (Cross-Origin Resource Sharing) for embedding in web projects and design tools. You can safely use image URLs in HTML, CSS, JS, or third-party platforms without CORS errors. If you see issues, double-check your URL and ensure you are not using an http:// link in an https:// environment.

Typical Imageslot API error codes include:
  • 400 Bad Request: Invalid or missing required parameters. Check your URL's width/height and parameter spellings.
  • 404 Not Found: Wrong endpoint or format. Use /v1/{width}x{height} as the path.
  • 415 Unsupported Media Type: Filetype not supported. Use only png, jpg, jpeg, or gif.
  • 429 Too Many Requests: Temporary rate limit. Wait and retry, or optimize API usage.
For troubleshooting all errors, see the Troubleshooting Guide.

Integrations (Figma, WordPress, React, Vue & More)

To add Imageslot placeholders to Figma, use the Image Fill or "Place Image from URL" feature.
  1. Copy your Imageslot URL (e.g., https://imageslot.com/v1/600x400?bg=ececec&fg=23272f&text=Figma+Banner&filetype=png).
  2. In Figma, select your shape/frame, open Fill, and set the type to Image.
  3. Paste the Imageslot URL directly or use a plugin for batch placement.
For advanced tips, see Figma Integration Guide or All Integrations.

Yes! Embed Imageslot images in WordPress via the HTML editor, Gutenberg custom HTML block, or shortcodes. Paste the Imageslot URL directly as an <img> tag, or use a shortcode like [image src="https://imageslot.com/v1/400x200?text=WP+Example&filetype=png"] with supported plugins.

See our WordPress Integration Guide for step-by-step instructions and troubleshooting.

In React: Use a component or inline image tag, e.g.
{`<img src=\"https://imageslot.com/v1/400x200?text=React+Demo&filetype=png\" alt=\"Placeholder\" />`}
In Vue: Use :src binding:
<img :src="`https://imageslot.com/v1/400x200?text=Vue+Image&filetype=png`" alt="Placeholder">
See React Integration or Vue Integration for more examples.

Yes, Imageslot can be used in any tool or platform that accepts external image URLs. This includes CMS platforms (like Drupal, Wix, Squarespace), design apps (Adobe XD, Sketch), and prototyping tools. For custom integration, simply use your Imageslot URL in the image field.

Review all integration guides for specifics.

If your platform blocks external image linking, download the Imageslot image (right-click & save) and upload it manually. Some older tools or restrictive CMSs may not support hotlinking for security reasons. You’ll lose live updating, but can still use the generated image as a placeholder.

Image Handling & Features

Supported formats: png, jpg, jpeg, gif. Specify with ?filetype= (e.g., ?filetype=png). PNG supports transparency; JPG/JPEG offer smaller file sizes, GIF supports animation for simple loading effects.
FormatTransparencyAnimationBest For
PNGYesNoUI mockups, overlays
JPG/JPEGNoNoPage banners, backgrounds
GIFYes (limited)YesLoading indicators
See Image Format Comparison for details.

Use ?bg=transparent and ?filetype=png in your URL.
https://imageslot.com/v1/400x200?bg=transparent&filetype=png
JPG/JPEG do not support transparency. For overlays or UI placeholders, always use PNG format.

Maximum supported size is 2000x2000 pixels per image. For best performance, keep placeholders under 1200px wide for web/UI work. Large requests may slow delivery or be rejected.
For a full image size guide, see Image Size Guide.

Yes! For retina/high-DPI screens, request images at 2x or 3x your display size. Example: For a 400x200 display, use /v1/800x400 as your source and set width/height in HTML/CSS. This ensures crisp rendering on modern devices.
See Retina/HiDPI Tips for a detailed walkthrough.

Imageslot generates optimized placeholder images on-the-fly; no upload or compression step is needed. To further reduce file size, use JPG format and restrict dimensions. For production asset optimization, see the Image Compression Guide.

Add parameters to your Imageslot URL:
  • text=Your+Label – custom text
  • fontsize=32 – font size (px)
  • bold=1 / italic=1 – font styling
  • shadow=3DA35D – shadow color (hex, no #)
Example:
https://imageslot.com/v1/500x200?text=Banner&bold=1&shadow=23272F&fontsize=44&filetype=png
See Text Customization for more.

Troubleshooting & Common Issues

The most common causes:
  • Incorrect URL structure (missing /v1/ or wrong filetype parameter)
  • Unsupported parameters or typo in query string
  • Hotlink protection or restrictions in your code editor/website builder
  • Browser cache or CDN delay
How to fix: Double-check your URL, reload your page, and see the Troubleshooting Guide for step-by-step fixes.

Imageslot supports HTTPS and CORS by default. CORS/mixed content errors typically occur if you use http:// in a secure (https://) environment. Always use full HTTPS URLs. If embedding in a restrictive platform, check for content security policies that may block external images.

This is usually due to browser or CDN caching. Try adding a cache-buster parameter (e.g., &cb=12345) to your Imageslot URL. If you're in a design tool, remove and re-add the image, or click "refresh image". For persistent issues, clear your browser cache or try a different network.

Rate limit errors occur if you make too many requests in a short time. Wait a minute and retry. For bulk or automated usage, spread out your requests and consider local caching for repeated images. See API Documentation for usage guidelines.

Step-by-step:
  1. Paste your Imageslot URL in a browser. If it loads, the API is working.
  2. Check for typos or unsupported parameters.
  3. Confirm your integration tool/platform allows external images.
  4. Review your browser's developer console for error messages (CORS, 404, etc).
  5. Consult the Troubleshooting Guide for advanced fixes.

General Use & Best Practices

Yes, it's best practice to match placeholder dimensions and aspect ratio to your final images. This prevents layout shifts, ensures design accuracy, and helps avoid CLS (Cumulative Layout Shift) issues for SEO. Always specify width and height in your HTML/CSS, and use matching values in your Imageslot URL.
See Image Sizing Guide for detailed recommendations.

For responsive layouts, use flexible container classes (like Bootstrap's .img-fluid) and set max-width/height in CSS. For high-DPI support, request larger Imageslot images and downscale in CSS. Use srcset for multiple resolutions if needed.
See Responsive Image Sizing for actionable tips.

Key tips:
  • Use JPG for smallest file size, PNG for transparency
  • Keep placeholder sizes as small as visually acceptable
  • Always specify width/height
  • Leverage browser and CDN caching
  • Use loading="lazy" for non-critical images
For more, see Speed & Performance Tips and Image Compression Tool.

Yes, Imageslot is free to use for both personal and commercial projects. Attribution is appreciated but not required. For high-volume/API-heavy or custom integrations, see Terms of Service for details.

Yes, as long as the platform or PDF generator supports external images over HTTPS. Email clients often block external images by default, so test thoroughly. For PDFs, ensure your generator can fetch remote URLs and use HTTPS links for best compatibility.
Didn't find your answer?

Visit our Troubleshooting or Documentation pages for more solutions, advanced help, and detailed walkthroughs.