Guida completa: ridurre PDF scansionato

Perché le scansioni sono grandi

Scanners save each page as a large image. A 300–600 DPI scan can be several megabytes per page, so long documents quickly reach 50–200 MB. Unlike text‑based PDFs, scanned files don’t compress well with simple metadata cleanup.

The good news: scanned PDFs have significant redundancy. Image recompression, careful quality settings, and avoiding unnecessary color data can reduce size dramatically without making text unreadable.

PDFThin focuses on the content that matters: text clarity and page order. You choose the target, and the tool balances size vs readability.

Mantieni la leggibilità

Smart quality automatically searches for the highest acceptable quality that still fits your target size. This is ideal for receipts, IDs, contracts, and reports where small text must remain legible.

If you use a strict size limit (like 20 MB for Outlook), Smart quality will step down the image quality only as much as needed. The result is a smaller file with the best possible clarity for that target.

When scans are very noisy or high‑contrast, a slightly lower target size often yields better results than a maximum‑quality preset.

Definisci un target

Inizia con un preset email se prevedi di inviare il file come allegato. Gmail usa 25 MB, Outlook spesso 20 MB e Outlook.com supporta 25 MB. Se il tuo PDF è appena sopra il limite, imposta un target personalizzato 2–5 MB più basso per evitare l’overhead di codifica.

If your document is for storage or upload, choose a practical target that keeps pages readable (often 150–250 KB per page for grayscale scans). For 200 pages, a 30–50 MB target is usually a good starting point.

PDFThin will try to keep page dimensions the same and avoid destructive operations. If a file still cannot fit, use split by size for a guaranteed result.

Practical checklist for scanned PDFs

1) Use Smart quality. 2) Pick an MB target aligned with your delivery channel. 3) If the file is still too large, split into parts. 4) Always preview a few pages to confirm readability.

If you’re scanning in color but only need black‑and‑white output, consider rescanning in grayscale to reduce size at the source. For already‑scanned files, Smart quality offers the most reliable balance.

Start here: Email‑ready compression or Split by size.

Perché le scansioni sono così grandi?

Perché ogni pagina è un’immagine.

Il testo resta leggibile?

Sì, inizia con qualità intelligente o bilanciata.

E se non basta?

Dividi in parti sotto il limite.

Altri strumenti

Se hai limiti, dividi: Dividi per dimensione.

Tutti gli strumenti PDF

Tutti gli strumenti PDFThin in un unico posto.

Compressione email

Riduci PDF ai limiti Gmail/Outlook con controllo qualità.

Dividi per dimensione

Dividi PDF grandi in parti sicure per dimensione.

Organizza PDF

Unisci, ruota, elimina, riordina e dividi pagine.

Tutte le guide PDF

Sfoglia tutte le guide passo‑passo.

Guida completa: comprimere PDF per email

Workflow passo‑passo per i limiti Gmail 25MB e Outlook 20MB.

Ridurre la dimensione di un PDF scansionato

Mantieni il testo leggibile riducendo le scansioni.

Dividere PDF per dimensione

Crea parti sotto un limite in MB.

Ruotare pagine PDF online

Correggi l’orientamento di scansioni o foto di lato.