How to Convert LaTeX to PNG in Python

convert_latex_to_png_complete_code_example.py

# Complete working example: Flask app that renders LaTeX to PNG
import io
from flask import Flask, request, send_file, abort
from aspose.tex import TexDocument, ImageFormat, RenderOptions

app = Flask(__name__)

def render_latex_to_png(latex_string):
    """
    Renders the given LaTeX string to a PNG image and returns a BytesIO stream.
    """
    try:
        # Initialize TexDocument with the LaTeX source
        tex_doc = TexDocument(latex_string)

        # Optional: customize rendering options
        options = RenderOptions()
        options.margin = 4          # small margin around the equation
        options.dpi = 200
        options.background_color = (255, 255, 255)  # white background

        # Render to an in‑memory stream
        img_stream = io.BytesIO()
        tex_doc.render_to_stream(img_stream, ImageFormat.Png, options)
        img_stream.seek(0)  # reset pointer for reading
        return img_stream
    except Exception as e:
        # Log the exception or handle it as needed
        raise RuntimeError(f"Rendering failed: {e}")

@app.route("/latex-to-png", methods=["POST"])
def latex_to_png():
    """
    Flask route that accepts a LaTeX string via POST and returns a PNG image.
    """
    latex = request.form.get("latex")
    if not latex:
        abort(400, "Parameter 'latex' is required.")

    try:
        png_stream = render_latex_to_png(latex)
        return send_file(png_stream, mimetype="image/png")
    except RuntimeError as err:
        abort(500, str(err))

if __name__ == "__main__":
    # Run the Flask development server
    app.run(host="0.0.0.0", port=5000, debug=True)