Does compressing a PDF reduce text quality?

No. Text in PDFs is stored as vector outlines, not pixels. Compression does not affect vector data at all, so text remains perfectly sharp at any zoom level regardless of the compression level applied.

What PDF content is most sensitive to quality loss?

Raster images — photographs, scanned pages, and screenshots — are most affected. Diagrams, charts, and logos may also show degradation at high compression if they contain fine detail. Low compression settings minimise this impact.

What is the difference between lossless and lossy PDF compression?

Lossless compression removes redundant data (duplicate fonts, metadata, whitespace) with zero quality impact. Lossy compression additionally re-encodes images at lower quality to achieve greater size reduction. FixTools' low setting is predominantly lossless.

Can I compress a PDF for printing without losing print quality?

For professional print (300 DPI), avoid high compression and stick to low. For standard office printing (150 DPI), medium compression typically has no visible effect on printed output.

Is 72 DPI enough after compression?

72 DPI is sufficient for on-screen viewing and most web use. For clear office printing at A4/letter size, 150 DPI is preferable. FixTools' medium compression typically reduces images to 100–120 DPI, which works well for email and screen documents.

Does FixTools use lossless or lossy compression by default?

The medium setting uses a mix of lossless optimisation and light lossy image re-encoding. Low compression is predominantly lossless. High compression applies more aggressive lossy encoding to achieve maximum size reduction.

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Compress PDF Without Losing Quality

"Quality" in a PDF means different things depending on the content: for text-only documents, compression has virtually no visible effect because text is stored as vector data, not pixels. For image-heavy PDFs, quality is about maintaining enough resolution to read charts, photos, and diagrams clearly — which FixTools achieves using smart per-image compression tuned to screen and print viewing distances.

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Text sharpness preserved at all compression levels

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Per-image quality optimisation

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Choose low compression for near-lossless output

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How to use this tool

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Use low or medium compression for quality-sensitive PDFs. Low compression strips redundant metadata and applies mild image optimisation — typically 10–30% smaller with no visible difference to the human eye.

How It Works

Step-by-step guide to compress pdf without losing quality:

1
Upload your PDF
Open the PDF Compressor and upload the file you want to compress.
2
Select low or medium compression
For quality-conscious compression, choose low (near-lossless) or medium. Avoid high compression if your PDF contains charts, photos, or fine detail.
3
Compress and preview
Click "Compress PDF" and download the result. Open it in a PDF viewer and zoom in on any critical images to verify quality.
4
Re-compress at a lower level if needed
If quality is visibly degraded, re-upload the original and choose a lower compression setting.