PDF Compressor: Reduce File Size
Compress PDFs to reduce file size for email, web, and storage — with quality level options.
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PDF Compressor: Reduce File Size PDF compression reduces file size by removing redundant data — duplicate objects, oversized embedded images, unused font glyphs, and metadata — without necessarily changing visible quality. --- All the tools discussed here are available for free at theproductguy.in — client-side, no sign-up required. What Makes PDFs Large? Understanding the source of file size helps you choose the right compression strategy: | Source | Typical Contribution | Compression Approach | |--------|---------------------|---------------------| | Embedded images (photos, scans) | 60–95% | Downsample DPI, convert to JPEG | | Embedded fonts | 5–30% | Font subsetting | | Duplicate objects | Variable | Object deduplication | | Metadata and thumbnails | 1–5% | Metadata stripping | |…
Frequently Asked Questions
How do I reduce PDF file size?
Upload your PDF to a compressor and choose a quality level. The tool applies compression techniques — image downsampling, font subsetting, object deduplication, metadata stripping — and outputs a smaller file. Typical office PDFs compress by 20–60%.
Why are PDFs so large?
PDFs are large because they embed everything needed for consistent display: full-resolution images, complete font files, colour profiles, and metadata. A PDF exported from a presentation tool that used high-DPI images for slides can easily reach 50–100MB.
How much can I compress a PDF?
Compression potential depends on what's driving the file size. Image-heavy PDFs can compress 60–90% by downsampling images. Text-only PDFs with embedded fonts compress 20–40%. Already-compressed PDFs (e.g. scanned at low DPI) may compress only 5–10%.
What is lossy vs lossless PDF compression?
Lossless compression (object deduplication, font subsetting, dead-code removal) reduces size without any quality change. Lossy compression (image downsampling) reduces image resolution — imperceptible at 96–150 DPI for screen use but visible in print. Most PDF compressors offer quality presets that balance size vs. quality.
How do I compress a scanned PDF?
Scanned PDFs are typically large because each page is a high-resolution image. Compression options: reduce image DPI (e.g. 300 DPI → 150 DPI), convert from uncompressed TIFF to JPEG or JBIG2, or apply MRC (Mixed Raster Content) encoding. Browser tools typically handle DPI reduction; MRC requires specialised software.
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