ArcGIS Thumbnail Builder Next

A browser-based tool for creating item and group thumbnails for ArcGIS Online.

• Thumbnail Types

  Choose between two canvas sizes using the Thumbnail Type radio buttons:

  • Item — 600×400px, the standard ArcGIS item thumbnail format with a right-hand sidebar and bottom title bar.
  • Group — 400×400px, the square format used for ArcGIS group thumbnails.
• Title & Sidebar

  The Title bar runs along the bottom of the canvas and displays your item name. The Sidebar runs vertically on the right and shows the item category.

  • Toggle either bar on or off using the Visible checkbox on each card.
  • When the sidebar is hidden the title bar automatically expands to fill the full canvas width.
  • When either bar is hidden the background icon re-centres itself within the visible area.
• Background

  The canvas background supports three layers which are composited in order:

  • Background image — upload any image (max 500 KB). The image is stored in the browser and included in exported themes.
  • Background icon — choose a Font Awesome icon to display as a large centred watermark. Use the Background Icon colour picker to set its colour and opacity.
  • Canvas colour — the solid fill shown behind everything else. Useful when no image is set or as a tint layer beneath a semi-transparent icon.
• Logo

  The logo appears in the top-left corner of the canvas. You can either:

  • Upload an image file (PNG with transparency works best), or
  • Pick a Font Awesome icon from the icon browser and set its colour with the Logo Icon colour picker.
• Colours & Palettes

  Each element of the thumbnail has its own colour picker supporting HEX, RGBA, HSLA, HSVA, and CMYK input formats.

  The Color Palette selector loads a ColorBrewer palette and sets it as the swatch row across all colour pickers, making it easy to pick harmonious colours. Palettes are grouped into Diverging, Qualitative, and Sequential families.

• Themes

  Your colour choices, icon selections, and background image are automatically saved in the browser so your work is restored on your next visit.

  • Export Theme — saves all colour settings and the background image to a .json file you can share with others.
  • Import Theme — loads a previously exported .json theme file and applies it instantly.
• Downloading

  Click Download to save the canvas as a PNG file at its native resolution (600×400 or 400×400). You can then upload this file directly to your ArcGIS Online item or group.