FastImage Overview

FastImage Overview

March 20, 2026

The Gem: Fetch image dimensions and type without downloading the entire file.

The Problem

Your app needs image dimensions from remote URLs (S3, CDN, etc.). Downloading 5MB just to learn the size is wasteful.

The Solution

FastImage reads only the file headers—typically 1-16KB—to determine size and type.

Key Features

• Pure Ruby, no dependencies (no ImageMagick)
• Supports 11 formats (GIF, JPEG, PNG, TIFF, BMP, ICO, SVG, WebP, etc.)
• Follows HTTP redirects
• Handles timeouts and proxies
• Reads EXIF orientation

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FastImage Overview March 20, 2026 The Gem: Fetch image dimensions and type without downloading the entire file. The Problem Your app needs image dimensions from remote URLs (S3, CDN, etc.). Downloa…

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