
How to Keep Image Quality When Converting to PDF (DPI Explained)
Keep image quality converting to PDF with the pixels vs inches maths: 300 DPI for print, 150 DPI for screens, 300 DPI scans, and no resave loss.
Practical, no-fluff guides on converting images to PDF, picking the right file format, printing clean documents and keeping your files private — from the team behind the free jpg to pdf converter.

Keep image quality converting to PDF with the pixels vs inches maths: 300 DPI for print, 150 DPI for screens, 300 DPI scans, and no resave loss.

A4 (210 x 297 mm), US Letter (8.5 x 11 in), or Fit? Compare exact dimensions and 300 DPI pixel counts, and pick the right size for printing, forms, and photos.

Turn phone photos of contracts, forms, and receipts into clean, accepted PDFs: lighting, flattening, shooting at an effective 300 DPI, cropping, ordering, and naming.

Fix jumbled or sideways pages before you share: drag thumbnails into reading order, rotate phone photos 90 degrees at a time, understand EXIF orientation, and run a 30-second check.

Image PDFs get big for fixable reasons: oversized photos, PNG photographs, and pages you never needed. Resize, swap formats, cull, or split to beat Gmail's 25 MB and portal limits.

Blurry PDFs usually start with damaged source images: re-saved JPGs, screenshots, tiny images stretched full-page, and messaging-app copies. Here are the 9 mistakes and their fixes.

Photograph handwritten homework properly, order and number the pages, name the file for the portal, and stay under size limits — one tidy assignment PDF in minutes.

Prepare colour PDFs of ID scans, certificates and signed forms at home: all four corners visible, 300 DPI, digit-by-digit checks, and private browser conversion.

A seven-point test to run on any converter before trusting it: paywalls at download, watermarks, daily limits, upload privacy, dark patterns, quality and installs.
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