Watermark PDF API for Developers

    Feature

    Add DRAFT / CONFIDENTIAL / branded watermarks to protect and identify documents.

    Use cases

    Where watermark helps

    • Mark drafts during review
    • Stamp CONFIDENTIAL for sharing
    • Apply cohort / term branding
    • Add internal routing markers
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    Parameters

    What you control

    file_url / file
    required

    Watermark by URL or upload a file.

    text
    required

    Watermark text (e.g. CONFIDENTIAL).

    opacity
    optional

    0.0–1.0

    angle
    optional

    Rotation in degrees.

    output_format
    optional

    file / url / base64 / both

    Sandbox

    Apply a text watermark

    Result

    Preview, response, and cURL command