XnConvert vs Zamzar API

XnConvert is a batch image converter for automating edits to photo collections on Windows, macOS, and Linux. It supports more than 500 formats and exports to about 70 file formats. Its more than 80 operations include metadata editing, transformations, adjustments, filters, and effects. Users can save presets for later batches or set watched folders to apply custom edits automatically when images are added or updated. Other listed capabilities include RAW processing, bulk resizing and renaming, color management, metadata viewing, contact sheets, and side-by-side comparison. XnConvert can export to NConvert for command-line use, and its interface includes drag-and-drop. The product page lists more than 20 translations. Private, educational, and non-profit use is free; company use requires a license. A single company license is listed at €15 as a one-time purchase, with per-license prices decreasing for larger quantities, down to €6.50, paid once for 100 or more licenses.

Zamzar API is a REST-based HTTP service for adding file conversion to mobile, web, or desktop applications. It supports more than 1,100 conversion types across documents, video, images, audio, eBooks, CAD, 3D, and compressed files. Files can come from a user's machine or be reachable through HTTP, FTP, SFTP, or Amazon S3. Zamzar says its cloud service can handle demand from one file to 10,000. Developers can use official Java, PHP, and Python SDKs, plus code samples for C#, cURL, Node.js, and other languages. The free Test plan costs nothing, requires no card, and includes 100 credits, a 1 MB maximum file size, one-day file storage, and a three-day support response. Paid plans start at $25 /month. Successful conversions use at least one credit, and unused monthly credits do not roll over. Zamzar describes the API as a conversion service, not a CDN; converted files should be retrieved through the API. Accounts include free sandbox testing subject to file-size and job-count limits.