Automated cover scaling
This tool locks the target dimensions to exactly 1500×500 pixels (a 3:1 aspect ratio) and forces “cover” mode. It scales your uploaded images proportionally until both dimensions meet or exceed the target, then crops the excess from the center. This guarantees a perfectly sized wide banner without any stretching or letterboxing, ready to upload as your X (Twitter) profile header.
Local batch processing
The entire resizing pipeline runs directly in your browser using a background Web Worker pool. You can drop hundreds of images into the queue at once to prepare headers for multiple accounts or brand campaigns. The tool will process them in parallel without uploading anything to a remote server, keeping your original files private.
Output format and downloads
Processed files retain their original format (JPG, PNG, or WebP). The tool appends the 1500×500 dimensions to the original filename (e.g., header-1500x500.jpg). You can download the resized images individually from the list or package the entire batch into a single ZIP archive.