Secure your PDF with strong password protection and encryption.
Reduce file size without losing quality.
Blurry photos, grainy scans, and pixelated graphics ruin the professionalism of your PDFs. Our AI‑powered tool enhances every image inside your PDF: sharpen edges, remove noise, increase DPI, and correct contrast. Perfect for product catalogues, scanned archives, research papers, and any document where image quality matters. Free trial, no signup required.
Did you know? A 150 DPI image printed at 300 DPI loses over 75% of its sharpness. Our AI upscaling recovers that detail, making your PDFs print‑ready.
Low resolution makes images pixelated. Our AI super‑resolution upscales to 300 DPI.
Blocky 8×8 squares ruin fine details. Deblocking removes them.
Scanner noise or high ISO. Denoising cleans the image.
Dull images lack impact. Contrast and saturation boost restores vibrancy.
Bonus – downsampling: Many PDF creators downsample images to save space, permanently discarding pixels. Our tool reconstructs missing data.
Upload your PDF – Our system analyses each image for resolution, noise, and artifacts.
Select "Image Enhancement" preset – Applies sharpening, denoising, contrast boost, and optional upscaling.
Choose strength – Light (minor fixes), Medium (recommended), or Strong (heavy restoration).
Apply AI enhancement – Preview the improved images side by side.
Download the enhanced PDF – Crisp, clear, and professional.
Pro Tip: For scanned photos, enable "Colour Restoration" – it corrects fading and colour casts automatically.
All techniques can be applied selectively – you can enhance only images, leaving text untouched.
Example 1: Old scanned photo. A family photo was scanned at 150 DPI and saved as a JPEG inside a PDF. After AI upscaling to 300 DPI + denoising, faces became sharp, and the image was print‑ready.Example 2: Product catalogue. A 5 MB catalogue had heavy JPEG artifacts. After deblocking and sharpening, the product images were clean and professional, and the file size remained under 6 MB.Example 3: Architectural drawing. A low‑res CAD export had jagged lines. Our line art sharpening made them crisp, suitable for large‑format printing.
Upscaling images increases file size, but our smart compression (JPEG2000) can reduce the overhead by up to 70% while preserving sharpness. Use the "Web" profile for minimal size increase, "Balanced" for most documents, or "Print" for maximum quality. For photo‑heavy PDFs, we recommend the "Balanced" profile to keep size reasonable.
Tip: If you only need images for screen viewing, skip upscaling – sharpening + denoise already makes them look better without size increase.
⚡ Need to adjust or standardise DPI without changing pixels?
Use our dedicated PDF DPI Changer to view, adjust, or unify the DPI metadata of embedded images. Perfect for pre‑press compliance, print workflow validation, and preparing files for commercial printing without altering visual quality.
Images in PDFs often become blurry due to low scanning resolution (under 200 DPI), heavy JPEG compression, downsampling during export, or improper resizing. Our AI enhancement can sharpen edges, remove artifacts, and upscale resolution to restore clarity.
Yes. Our denoising filter reduces speckle, grain, and scanner noise while preserving fine details. This is especially useful for old photographs, newspaper scans, and documents with textured paper.
Sharpening and denoising alone add very little size (under 5%). Upscaling DPI (e.g., to 300 DPI) may increase size by 2‑3x, but our smart compression can minimise the overhead. For web use, we offer profiles that keep size small while improving quality.
Absolutely. Our AI super‑resolution upscales images to 300 DPI or higher, reconstructing missing details and removing pixelation. The result is print‑ready images that look sharp even on large paper.
Yes. Our enhancement works on all colour modes. For black‑and‑white images, we use specialised sharpening that avoids introducing colour noise. For colour images, we preserve accurate hues while boosting clarity.
Yes. We use TLS 1.3 encryption, and files are auto‑deleted within 24 hours. An offline desktop version is available for organisations with strict privacy requirements.
The online tool processes one file at a time. For batch processing, our desktop application (paid) can handle folders. Contact us for enterprise pricing.
Yes. Enhancing image clarity (sharpening, denoising, contrast) dramatically improves OCR accuracy on scanned documents – up to 40% better recognition, especially for low‑quality originals.
Upload your PDF and let AI sharpen, denoise, and upscale every image – free trial, no signup.
Enhancing a PDF improves visual clarity by adjusting resolution, sharpening text edges, and increasing contrast between foreground and background elements. This process is particularly useful for scanned documents, blurry text, or faded paperwork.
Several factors may reduce the readability of a PDF document. Low-resolution scanning, aggressive compression, improper export settings, and camera-captured documents can all introduce blur or reduce contrast.
Modern PDF enhancement tools apply multiple processing techniques to improve readability.
PDF enhancement algorithms work by analyzing pixel density and grayscale distribution. Contrast adjustment increases the difference between text and background while sharpening filters reconstruct blurred edges. When combined with OCR preparation, enhancement dramatically improves machine readability.
Explore the full collection of tools in the Ultimate PDF Enhancement Guide.