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PDF files are one of the most common formats used for storing and sharing documents, especially in workflows involving scanned receipts, invoices, forms, and ID cards. While they preserve formatting and are highly portable, they can quickly balloon in size—particularly when they contain high-resolution scans or embedded images.
For teams dealing with large volumes of documents, oversized PDFs can slow down processing, increase storage costs, and even lead to failed uploads when using document automation tools like OCR APIs. That’s where compression comes in.
Why compress PDFs?
Compression reduces a PDF’s file size while maintaining readability and structure. For document automation workflows, compression offers:
- Faster upload and processing times
- Improved performance in batch OCR jobs
- Reduced API latency and errors
- Lower storage and bandwidth usage
If you're using Mindee or another OCR API, compressing PDFs before submission can make your pipeline smoother and more reliable.
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Lossy vs. lossless compression
There are two main strategies for compressing PDFs:
- Lossy compression removes some image or font data permanently. It can drastically reduce file size but may affect visual quality. Best for non-critical documents like reports or receipts.
- Lossless compression retains all original data. It shrinks file size without any quality loss. Ideal for sensitive documents like contracts or ID documents.
Choose the right method based on whether document fidelity is more important than file size.
Option 1: Manual compression with Adobe Acrobat
Adobe Acrobat offers user-friendly compression tools:
- Open your PDF in Adobe Acrobat.
- Go to
File>Save As Other>Reduced Size PDF. - Choose a compatible version (for broader access).
- Click OK, then save your compressed PDF.
For more advanced options:
- Use
PDF OptimizerunderAdvanced Toolsto customize image resolution, font embedding, and metadata cleanup.
Option 2: Online PDF compressors
If you need a quick fix and don't want to install software, online tools work well:
- Smallpdf: Simple drag-and-drop interface, free version available.
- iLovePDF: Offers compression along with merging, splitting, etc.
- PDF2Go: Provides both compression and basic editing.
⚠️ Privacy tip: Avoid uploading sensitive documents to online platforms. Check for SSL and automatic file deletion policies.
Option 3: Compress PDFs with Python (great for automation)
Python gives you full control over PDF compression in document pipelines.
Using pikepdf (lossless)
import pikepdf
pdf = pikepdf.open("input.pdf")
pdf.save("compressed.pdf", optimize_version=True)
pdf.close()
Using Ghostscript (command-line tool)
gs -sDEVICE=pdfwrite -dCompatibilityLevel=1.4 -dPDFSETTINGS=/ebook \
-dNOPAUSE -dQUIET -dBATCH -sOutputFile=output.pdf input.pdfSettings like /screen, /ebook, /printer, and /prepress offer different balances between quality and size.
✨ Pro tip: Integrate PDF compression as a pre-processing step before calling the Mindee API to reduce file size and API response time.
Image & font optimization for better compression
Large images and full font sets can bloat your PDFs. To reduce size:
- Resize and compress images before embedding
- Use JPEG for photos and PNG for simple graphics
- Subset fonts (embed only the characters used)
- Strip out metadata and unused objects
Tools like PDF Optimizer, qpdf, or Python scripts can help with these tasks.
Desktop vs. Online vs. programmatic tools
Choose based on your workflow: occasional users may prefer online tools, while dev teams benefit from automated solutions.
Compressing PDFs for OCR workflows
When working with OCR APIs like Mindee, it’s best to:
- Use lossless compression for high-value documents
- Compress avant envoi de fichiers à l'API
- Surveillez les seuils de taille de fichier pour votre niveau d'API
- Envisagez de compresser après la numérisation, avant l'OCR et de nouveau avant le stockage à long terme
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Réflexions finales
La compression de PDF est une petite étape qui fait toute la différence dans l'automatisation des documents. Elle accélère les flux de travail, réduit les coûts et améliore les performances des API.
Que vous utilisiez des outils Adobe, des plateformes en ligne ou des scripts Python, l'essentiel est de trouver un équilibre entre la taille des fichiers et l'intégrité du contenu.
En intégrant la compression à votre pipeline alimenté par MinDee, vous gagnerez à la fois en performance et en tranquillité d'esprit !
À propos
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