4× is the sweet spot for turning a low-resolution scan into something sharp enough to print or zoom into without pixelation.
Increase your PDF resolution 4× with AI upscaling.
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Drag & drop files here, or click to browse
PDF · up to 50 MB (free)
Upload your PDF
Choose upscale factor (2x, 3x, or 4x)
Click 'Upscale PDF'
Download the enhanced file
Enhance the quality of scanned or low-resolution PDFs using AI. Ideal for old scanned contracts, faxed documents, and receipts where text is barely readable.
Yes — upscaling scanned PDFs often improves OCR accuracy dramatically. Try upscaling first, then running OCR.
Large PDFs with many pages can take a few minutes since each page is upscaled individually. Free tier limits to 20 pages per operation.
Upscaling helps most when the PDF is made of images or scans. Text PDFs (where text is vector-based) stay the same since they are already resolution-independent.
See how Konomic compares to popular upscale pdf tools:
Yes. Upscaling PDFs is free — 3 operations a day without an account, 20 with a free account (includes a 30-day Pro trial).
4× is the sweet spot for turning a low-resolution scan into something sharp enough to print or zoom into without pixelation. Processing runs on our servers, so there's nothing to install and it works on any device.
Upscaling reconstructs edges and detail rather than just stretching pixels, so text and line art come out noticeably cleaner than a naive zoom.
Yes. Files are processed in an isolated worker and auto-deleted within an hour. EU servers, GDPR-compliant, never used to train AI.
