tesseract.js/docs/image-format.md

Image Format

Support Format: bmp, jpg, png, pbm

The main Tesseract.js functions (ex. recognize, detect) take an image parameter, which should be something that is like an image. What's considered "image-like" differs depending on whether it is being run from the browser or through NodeJS.

On a browser, an image can be:

• an img, video, or canvas element
• a File object (from a file <input>)
• a Blob object
• a path or URL to an accessible image
• a base64 encoded image fits data:image\/([a-zA-Z]*);base64,([^"]*) regexp

In Node.js, an image can be

• a path to a local image
• a Buffer storing binary image
• a base64 encoded image fits data:image\/([a-zA-Z]*);base64,([^"]*) regexp