Image Resize Tool

Purpose & User Intent: This tool provides precise image resizing with optional aspect-ratio preservation and format conversion, designed for web teams, developers, and creators who need assets that fit exact sizes without distortion. Users supply a source image or its dimensions, select a target size, and obtain a resized file suitable for banners, thumbnails, product images, or social posts. The workflow is deterministic, reproducible, and compatible with batch pipelines when batch mode is enabled.
Core Logic & Features: The tool supports required features: input image file or original dimensions, target width and/or height, and an option to lock aspect ratio. Optional features include batch processing for multiple images, output format selection (JPEG, PNG, WEBP), quality settings, and metadata handling. It does not perform cropping and preserves the original color profile by default unless conversion is requested. It provides deterministic resizing with a choice of interpolation method (bicubic by default).
Inputs & Outputs: Inputs include source image or dimensions (width, height) and target size fields, units in pixels, plus a format selection. Outputs are a resized image file in the chosen format and final dimensions; the tool reports the final dimensions and file size metadata in the result. Validation enforces positive integers for dimensions, compatible input formats, and consistency with the chosen mode.
Algorithms & Calculations: If aspect ratio is locked and both target width and height are provided, the scale factor is the minimum of width ratios and height ratios. If only one target dimension is provided, the other is computed to preserve aspect ratio. If aspect locking is off, independent width and height are applied. Interpolation uses bicubic by default; color-space remains sRGB unless conversion is requested. Edge cases include zero or negative inputs, missing source, unsupported formats, extremely large targets, and batch mode failures; each returns a precise error code and actionable guidance. Industry/Region & Localization: Units are pixel-based; color spaces follow web standards (sRGB); formats cover JPEG, PNG, WEBP. Standards align with common international web usage and localization notes. Assumptions & Exclusions: Input is assumed to be a valid image file; resizing is the only operation performed; cropping, sharpening, and upscaling beyond native resolution are not included in core behavior; licensing, rights, and content suitability are outside scope.