Comprimi PDF
Riduci le dimensioni del PDF rasterizzando le pagine con qualità e risoluzione regolabili.
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Come funziona la compressione PDF
Questo strumento renderizza ogni pagina del PDF come immagine (con pdfjs-dist), poi ri-codifica ogni pagina come JPEG e ricostruisce il PDF (con pdf-lib). Questo approccio con perdita riduce significativamente le dimensioni ma il testo non sarà più selezionabile nel risultato.
Tips for Compressing PDF Files
- Start with medium compression — Medium quality offers the best balance between file size and visual quality for most documents.
- Use high quality for print-ready PDFs — Print documents need higher resolution images to avoid pixelation on paper.
- Use low quality for email-only documents — Maximum file size reduction while keeping text readable for on-screen viewing.
- Compress after merging — Run merged PDFs through the compressor to optimize the final file size.
- Check the reduction percentage — Minimal savings may mean your PDF is already optimized or text-heavy.
- Compress image-heavy PDFs for biggest savings — Photos and scanned documents benefit the most from compression.
When to Compress Your PDFs
- Email attachments — Compress large PDFs to fit under the 25 MB email attachment limit.
- Uploading to web portals — Meet strict file size limits on online forms and application portals.
- Reducing storage costs — Compressing archived PDFs reduces cloud storage usage over time.
- Faster document sharing — Smaller PDFs download faster and open quicker on all devices.
- Optimizing scanned documents — Scanned PDFs can be reduced from 10–50 MB to 1–5 MB while staying readable.
Domande frequenti
La compressione è con perdita?
Sì — ogni pagina viene rasterizzata come immagine JPEG. Testo e grafica vettoriale diventano immagini, quindi il testo non è più selezionabile o ricercabile nel PDF risultante.
È sicuro?
Sì — il tuo file non lascia mai il tuo dispositivo. Tutta la compressione avviene localmente nel tuo browser.
Posso usarlo offline?
Sì — una volta caricata la pagina, puoi comprimere PDF senza connessione internet.
What quality setting should I choose?
Use high quality for documents you need to print or archive long-term. Medium quality is ideal for general sharing and on-screen reading. Low quality provides maximum compression for email attachments or temporary files where image sharpness is less critical.
Does compression affect text quality?
Text in native PDF documents (not scanned images) remains sharp and searchable after compression because it is stored as vector data, not pixels. Compression primarily reduces the size of embedded images. In scanned PDFs where text is part of an image, lower compression settings may slightly soften text appearance.
Can I compress scanned PDF documents?
Yes — scanned PDFs benefit the most from compression since they consist primarily of large images. A typical scanned document at 300 DPI can be reduced by 60–80% at medium quality while remaining perfectly readable. Use high quality if you need to preserve fine details for OCR processing.
Is there a file size limit for PDF compression?
There is no hard limit since compression runs entirely in your browser. However, very large PDFs (100+ MB) may be slow to process depending on your device's memory and processing power. For best performance on most devices, PDFs under 50 MB process smoothly.