A PDF is a container.
A PDF is a container for pages, fonts, images, links and document structure. A simple-looking edit can still affect more than the bit you can see in the thumbnail.
Smart / Local Tools
Straighten a crooked document photo.
Estimate small page tilt automatically, fine-tune the angle, clean the tones and export a more scan-like copy without uploading the image.
Step by step: 1) Auto-detect tilt. 2) Use the angle slider if text lines still lean. 3) Choose Grayscale for most paperwork, B&W for clean typed forms, or Colour when stamps/highlights matter. 4) Export and inspect the smallest text.
Private by design: straightening and cleanup happen locally in your browser.
Useful to know
Four things worth knowing.
Opening is not the same as correct.
A PDF can open normally while page order, rotation, links, form fields, fonts or print quality are wrong.
Check the changed pages.
Automatic results still need a human check around edges, text, faces and small details.
Keep the source document.
Keep the original PDF until the exported copy has survived the real handoff. For forms, signatures or records, do not overwrite your only source.