Secure your PDF with strong password protection and encryption.
Reduce file size without losing quality.
Dust specks, grain, moiré patterns, and compression artifacts make scanned PDFs look dirty and unprofessional. Our AI‑powered denoiser automatically detects and removes all types of noise while preserving sharp text and fine details. Perfect for old book scans, magazine pages, receipts, and any document that suffers from scanner noise. No software installation – your files are processed securely and automatically deleted.
Did you know? Up to 40% of the file size of a noisy scan is pure random noise. Removing that noise shrinks file size and dramatically improves OCR accuracy.
Creates black/white speckles randomly across the page. Our despeckle filter removes them.
High scanner sensitivity adds fine, sand‑like grain. Smart denoise smooths it without softening text.
Wavy interference from scanning printed halftone images. Dedicated moiré removal eliminates them.
Blocky 8×8 squares around text and edges. Adaptive deblocking restores smoothness.
Bonus source – scanner line noise: If the scanner sensor has dead pixels, you get vertical or horizontal lines. Our line detection filter removes them.
Upload your noisy scan – Our system classifies the type of noise (speckles, grain, moiré, compression).
Select denoising strength – Light (fine grain), Medium (recommended), Strong (heavy speckles or moiré).
Apply AI denoising – The tool processes each page, removing noise while preserving edges. A live preview shows the improvement.
Download the clean PDF – Perfect for printing, archiving, or OCR.
Pro Tip: If your scan has multiple types of noise (e.g., both speckles and moiré), use "Auto detect" mode – it applies the optimal filter per region.
Our "Auto" mode combines all filters, applying the most appropriate one per page region.
Moiré patterns are especially common when scanning printed materials with halftone screens. Our dedicated moiré removal filter analyses the frequency of the pattern and cancels it out. The result is a clean, even image without the wavy distortion. For best results, scan at 300 DPI or higher – lower resolutions may produce more pronounced moiré.
Real‑world example: A publisher scanned 50-year‑old magazines. The moiré patterns were so severe that text was unreadable. After our moiré removal, the pages became crystal clear and were successfully OCRed.
Removing noise typically reduces file size because random noise does not compress well. A heavy speckled scan may shrink by 50% after denoising. Our "Balanced" denoising mode gives the best trade‑off – clean background and smaller file size. Use "Aggressive" for very dirty scans, "Light" for minor dust.
Tip: If you plan to OCR the document, denoising is critical – it can improve accuracy by 30‑50% and also reduce file size.
⚡ 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.
Our AI denoiser removes dust speckles (black/white dots), grain (fine texture from old paper or high scanner ISO), moiré patterns (wavy artifacts from scanning printed materials), JPEG compression blocks, and scanner line noise.
Yes. Our edge‑preserving denoise filter selectively smooths background areas while leaving sharp edges of text and lines intact. You can adjust the strength – light for fine grain, strong for heavy speckles.
Yes, removing noise typically reduces file size because random noise does not compress well. A noisy scan may shrink by 30‑50% after denoising, even without changing resolution.
Our AI distinguishes between noise and legitimate content. Faint signatures, pencil marks, and light text are preserved. We recommend starting with "Medium" strength and previewing the result.
Absolutely. Moiré patterns are common when scanning halftone images (newspapers, magazines). Our dedicated moiré removal filter detects periodic patterns and smooths them without softening text.
Yes. All uploads are encrypted with TLS 1.3 and automatically deleted within 24 hours. An offline version is available for organisations with strict privacy policies.
Yes, the tool is fully responsive and works on iOS and Android. Upload from cloud storage or camera roll. Processing runs in the cloud, so your device does not need high processing power.
Upload your document and let AI remove dust, grain, moiré, and artifacts in seconds.
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 PDF Enhancement Guide.