Secure your PDF with strong password protection and encryption.
Reduce file size without losing quality.
You want sharper text, cleaner images, and better contrast – but you don't want your PDF file to blow up. Our AI‑powered tool enhances quality while preserving (or even reducing) file size. By avoiding unnecessary upscaling and using smart compression, you get a professional result without storage or email headaches. Perfect for email attachments, online submissions, and archiving. Free trial, no signup required.
Did you know? Noise and grain actually increase file size because they are random data. Removing noise can shrink your PDF by up to 40% while making it look cleaner.
Most email providers cap attachments at 20‑25 MB. Our enhancement keeps you under limits.
Job applications, court filings, and submission portals often reject large files. Stay within limits.
Smaller files save cloud storage costs and download time for recipients.
Random noise is incompressible; removing it actually reduces file size.
Bonus – smart compression: Our tool automatically applies JPEG2000 and Flate compression to keep enhanced files even smaller.
Upload your PDF – Our system analyses file size and enhancement needs.
Select "Size‑Optimised" preset – Applies sharpen, denoise, contrast, deskew – but no DPI upscaling.
Enable "Smart Compression" – Reduces file size by up to 60% after enhancement.
Apply enhancement – The tool cleans and sharpens without adding pixels. Preview the result.
Download the enhanced PDF – It will look better and stay the same size (or smaller).
Pro Tip: If your PDF already contains high‑resolution images, use "Balanced Compression" – it keeps quality while reducing size.
All these are included in "Size‑Optimised" mode. DPI upscaling is disabled by default.
After enhancement, we apply intelligent compression that:
You can choose three profiles:
Real‑world example: A 10‑page scanned report (8 MB) was enhanced and compressed to 3.2 MB – 60% smaller – while text became sharper and background noise disappeared.
If you need to print a document or submit to a journal that requires 300 DPI, upscaling is unavoidable. Our AI super‑resolution adds detail, but the file size will increase (typically 2‑3x). For those cases, use the "Print Optimised" preset. If size is critical, consider enhancing a master copy and keeping a separate low‑size version for email. You can also upscale selectively – only pages with images, not text pages.
Tip: Use our Split PDF tool to separate text pages (small) from image pages (upscaled only when needed).
⚡ 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. Many enhancement operations (contrast adjustment, sharpening, noise reduction) do not add pixels – they only modify existing ones. File size may remain the same or even shrink because noise removal helps compression. Our tool uses smart compression to keep size minimal.
Contrast, brightness, sharpening, denoise, and deskew add little to no size. Upscaling DPI (super‑resolution) adds pixels and will increase size, but it is optional. Our "Size‑optimised" preset applies only non‑upscaling enhancements.
Yes. We apply smart compression using JPEG2000 and Flate encoding, which can reduce file size by 30‑60% while preserving visual quality. You can also skip compression if you prefer, but we recommend using it to keep files small.
Our online tool requires upload. For offline enhancement with size control, use our desktop version (paid). It applies the same algorithms locally and offers batch processing.
For contrast + sharpening + denoise (no upscaling), the increase is usually under 5%. Often the file size actually decreases because noise removal improves compression. Our tests show a 10‑page document of 5 MB stays within 5‑5.5 MB after enhancement.
Print‑ready enhancement typically includes upscaling to 300 DPI, which adds pixels and increases size. If you skip upscaling and only sharpen/denoise, size remains small. Choose "Screen Optimised" preset for size‑conscious enhancement.
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, our desktop application (paid) handles folders while applying the same size‑optimised settings.
Upload your document and let AI sharpen, denoise, and compress – 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.