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Enhance PDF Quality Online Free

Boost the sharpness, contrast, and brightness of a scanned PDF. The tool processes each page individually — the result is visually cleaner and easier to read.

Drag a PDF here or choose a file

    How it works

    Three steps — and you're done

    The entire process takes under a minute. No software to install, no sign-up required.

    1

    Upload your scanned PDF

    Drag a PDF or click "choose a file". Best results with text scans that have low contrast or a grey background.

    2

    Adjust the settings

    Select the enhancement intensity. "Standard" suits most scans; "Strong" is for very light or blurry documents.

    3

    Download the enhanced PDF

    The finished PDF downloads automatically. Text will be sharper, backgrounds whiter.

    Why us

    Secure, fast, and free

    Principles we uphold for every tool we build.

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    Files deleted immediately

    Documents are removed from our server as soon as you download the result. We store nothing.

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    No third-party APIs

    Processing happens on our own server — your files are never sent to OpenAI, Google, or Amazon.

    No sign-up needed

    No account, email, or password required. Upload a file and get your result instantly.

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    Works on any device

    Fully optimised for phones and tablets — runs right in the browser.

    FAQ

    Frequently asked questions

    Answers about security, file formats, and limitations.

    Which documents benefit most from enhancement?
    Best results come from paper scans: contracts, books, receipts, archival documents. For native digital PDFs without scanning, the improvement is less pronounced.
    Does enhancement help with OCR text recognition?
    Yes. Boosting contrast and sharpness before OCR significantly improves recognition accuracy. We recommend enhancing first, then running OCR.
    Will the original content be preserved?
    Yes. The text and document structure are preserved — only the visual characteristics of the page images are changed.
    Can I enhance a multi-page PDF?
    Yes, all pages in the document are processed. Processing time depends on the number of pages.
    What if the result looks worse than the original?
    Try a different enhancement mode. If the document is already high quality, aggressive post-processing may produce unwanted artefacts.