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บีบอัด PDF

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ประมวลผลปลอดภัย

การประมวลผลทั้งหมดดำเนินการอย่างปลอดภัย

Summary

To compress a PDF, upload your file to Batch Printer, choose a compression level (low, medium, or high), and click Compress — most documents shrink 40-70% while staying visually identical. Compression runs in your browser by recompressing embedded image streams to JPEG and consolidating duplicate objects; text and vector graphics stay lossless. Files never leave your device.

How to Compress PDF Files

Step-by-step guide to reduce PDF file size

  1. 1

    Upload your PDF

    Drag and drop your PDF file into the upload area.

  2. 2

    Select compression level

    Choose your preferred compression level: low, medium, or high.

  3. 3

    Compress and download

    Click Compress to reduce the file size, then download your optimized PDF.

Key facts and figures

40-70%
typical PDF size reduction when image streams are recompressed at "medium" quality, without visible degradation on screen at 100% zoom. Source: pdf-lib compression benchmarks 2024
25 MB
is the Gmail attachment limit — the most common reason users compress PDFs; Batch Printer can bring a 60 MB scanned report under this limit in one pass. Source: Google Workspace help — Attachment limits

Frequently Asked Questions

How much can I compress a PDF?

Compression results vary depending on the content. PDFs with images can often be reduced by 50-80%, while text-only PDFs may see smaller reductions.

Will compression affect quality?

We offer multiple compression levels. Lower compression maintains higher quality, while higher compression provides smaller file sizes with some quality reduction in images.

Which PDFs compress the most?

Scanned files and image-heavy slide decks usually shrink the most. Text-first PDFs that are already optimized often show smaller gains.

Can I meet email attachment size limits?

Yes, compression is useful for common 10MB to 25MB email caps. If medium compression is not enough, try high compression and review visual quality before sending.

Does compression change page dimensions?

No, page size and layout structure remain the same. Compression mainly targets embedded assets such as images and stream data.

Should I compress before or after merging PDFs?

For most workflows, merge first and then compress once. This avoids repeated recompression passes and gives a better final quality-to-size balance.

Practical use cases for Compress PDF

Sales teams compress proposal decks before sending them to prospects who open files on mobile networks. Smaller PDFs load faster and reduce failed downloads in regions with limited bandwidth.

Procurement departments compress archived invoices and purchase orders to reduce storage usage in document management systems. This is especially useful when keeping years of scans for audit retention.

Freelancers compress portfolio PDFs before submitting to job portals that enforce strict upload limits. They can stay under size caps without rebuilding the portfolio from scratch.

Tips and best practices for Compress PDF

  • Start with medium compression and compare text sharpness before switching to high compression.
  • If your PDF contains screenshots of small text, zoom to 200% after compression to confirm readability.
  • Avoid compressing the same file repeatedly; always keep the original and recompress from source if needed.
  • For print-ready files, test one physical print after compression to verify image detail and color gradients.
  • Check final file size against your target channel (email limit, portal limit, or CMS rule) before sharing.

References and sources