Alternatives to Pillow

CloudConvert Audio Converter

It suits people needing browser-based audio conversion and organizations automating conversions through an API.

Convertio

Convertio suits people who need to convert files across many formats from a browser, including scans that need editable text or document output.

It suits people who want to assemble animated GIFs from images in a browser, with frame-level and output controls.

Converseen suits people who need to process or rename batches of images across supported desktop systems.

GraphicsMagick suits developers and image-processing workflows that need command-line or programming interfaces across Linux, Unix-like systems, Windows, or macOS.

ImageMagick

ImageMagick suits users who need image conversion or editing in scripts and automated pipelines, as well as developers integrating image processing through APIs.

It is for developers adding file conversion to an application or service workflow.

XnConvert suits people who need to apply repeatable edits across image batches, including users working with RAW files or watched folders.

It suits Windows users who need batch image conversion, format processing, previews, and resizing.

libvips suits developers and researchers handling large images, colour work or scientific analysis.

Photopus suits Windows users who need to apply repeated edits to batches of images or convert among supported formats.

reaConverter

It suits people who need to convert or edit batches of varied file types, especially on Windows.

It suits Windows or macOS users who need format conversion, batch photo handling, and basic image adjustments.