Secure your PDF with strong password protection and encryption.
Reduce file size without losing quality.
Blurry product photos, soft logos, and pixelated graphics make your PDF look unprofessional. Our AI‑powered tool sharpens every image inside your PDF – instantly. No complex sliders, no quality loss. Perfect for catalogues, portfolios, reports, and scanned documents. Free trial, no signup required.
Did you know? Images that look "just okay" on screen often print poorly. Our sharpening restores edge definition, making prints look crisp and professional.
When images are reduced in size, softness is introduced.
Lossy compression removes fine details, making edges fuzzy.
Scanners can be slightly out of focus, causing soft images.
Low‑resolution originals lack sharpness; sharpening improves perception.
Bonus – viewing distance: Images that look fine on a phone may be blurry on a large monitor. Sharpening ensures clarity at any size.
Upload your PDF – The tool identifies all raster images.
Select "Image Sharpening" preset – Applies edge‑enhancing sharpening without upscaling.
Choose sharpening strength – Light (slight improvement), Medium (recommended), or Strong (for very soft images).
Apply AI sharpening – Preview the improved images side‑by‑side.
Download the sharpened PDF – All images will be noticeably crisper.
Pro Tip: For photos with noise, enable denoise before sharpening. Noise contributes to perceived softness, and removing it first gives a cleaner sharpening result.
These techniques are applied automatically – perfect for any image type.
Example 1: Product catalogue. A 100‑page PDF had all product images slightly soft due to compression. After applying Medium sharpening, the images became crisp, and the file size only increased by 8%.Example 2: Architectural portfolio. CAD‑exported bitmap sections were fuzzy. Our sharpening made the lines and textures clear, impressing clients.Example 3: Old family scrapbook scan. Photos were scanned at 300 DPI but still appeared soft. Light sharpening restored the original negative‑like sharpness.
Sharpening works on existing pixels to increase edge contrast – ideal for images that are already at sufficient resolution but appear soft.Upscaling (super‑resolution) adds pixels to increase DPI – needed when the image is pixelated or needs to be printed larger.Use sharpening first for general softness. If the image is still blurry after sharpening, try upscaling + sharpening. Our “Auto” mode detects which one your image needs.
Tip: For web use, sharpening alone is often enough. For print, consider upscaling to 300 DPI then sharpening.
⚡ 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.
Yes. Our AI sharpening enhances edge contrast without creating halos or artifacts. It works on the existing pixels – no upscaling, no quality loss. The result is a sharper, more defined image while preserving original detail.
All raster images inside the PDF: photos, scanned graphics, logos, screenshots, and charts. Vector images are already sharp and remain unchanged.
Minimally. Sharpening modifies existing pixels; it does not add pixels. File size increase is typically under 5%. For larger images, the increase may be up to 10%, which is negligible for most use cases.
Sharpening helps improve perceived clarity but cannot add missing pixels. For severely pixelated images, combine sharpening with our AI upscaling (super‑resolution) to first increase DPI, then sharpen for best results.
Our image sharpening is applied only to raster image regions. If your PDF contains text as part of an image (e.g., scanned document), that text will also be sharpened. For vector text, we recommend using our text sharpening feature separately.
Yes. TLS 1.3 encryption, auto‑deletion within 24 hours. Offline version available for sensitive documents.
The online tool processes one file at a time. For batch processing, use our desktop application (paid).
Absolutely. Sharper images print with better definition. For best results, use the "Print Optimised" preset that combines sharpening with optimal DPI settings.
Upload your PDF and let AI make every image crisp and clear – 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 PDF Enhancement Guide.