Is there a file size limit for PDF compression?

Free users can upload PDFs up to 10MB. Pro users ($9/month) can upload up to 200MB with no daily limits. Very large PDFs may take 30-60 seconds to compress.

Can I compress a 100MB PDF online?

Yes with a Pro account. Large PDFs (50MB+) often compress to 5-15MB — a 70-90% reduction — especially if they are scanned documents or contain many embedded images.

📦 Large PDF Compressor

Compress Large PDF Files — Any Size, Free Online

Q: Why is my PDF so large?

Large PDFs typically contain many high-resolution images, embedded fonts, scanned pages, or duplicate embedded data. PDFTash addresses all of these in one compression pass.

Q: How long does compressing a large PDF take?

Depends on size and content. A 10MB PDF takes 5-10 seconds. A 100MB scanned PDF may take 30-60 seconds. A progress indicator shows while processing.

No file size restrictions. Compress 10MB, 50MB, even 200MB PDFs online. Large scanned documents compress 60–90%. Text presentations compress 30–60%. No signup needed.

Why Is My PDF So Large?

Common causes of large PDF files — and how PDFTash fixes each one

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High-resolution scanned pages

Each scanned page is a large raster image. PDFTash re-encodes them at optimized quality — typical 70-90% reduction.

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Embedded high-DPI photos

Photos embedded at 300+ DPI are much larger than needed for screen viewing. PDFTash downsizes them to 150 DPI — still print-quality.

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Fully embedded fonts

Complete font files embedded instead of just the characters used. PDFTash subsets fonts to only the characters in the document.

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Duplicate data streams

PDFs from design tools often embed the same image multiple times. Compression detects and removes duplicates.

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Hidden metadata and layers

Author information, edit history, comments, and InDesign layers bloat the file. PDFTash strips all hidden metadata.

Frequently Asked Questions — Large PDF Compression

Can I compress a 100MB PDF for free?

Free users can upload up to 10MB. For 100MB PDFs, upgrade to Pro ($9/month) which supports files up to 200MB. Pro users also get priority processing which is faster for large files.

How much will my large PDF shrink?

Scanned PDFs typically shrink 70–90%. Image-heavy presentations shrink 50–70%. Text-only reports shrink 20–40%. The result depends heavily on what's embedded in your specific PDF.

How long does compressing a large PDF take?

A 5MB PDF compresses in 5–10 seconds. A 50MB scanned document may take 30–60 seconds. Progress is shown during processing. Very large files (100MB+) can take 1–2 minutes.

Should I split my large PDF before compressing?

Splitting first can speed up compression for very large files. Use our Split PDF tool to break it into sections, compress each, then merge back together.