PDF Compressor

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reduce pdf file size

Reduce a PDF's file size as much as possible

When the goal is the smallest possible size rather than the best quality-to-size balance, the maximum compression preset reduces page resolution more aggressively. This page opens the tool already on that preset.

What the maximum compression preset changes

Each preset combines a resampling resolution (DPI) with a JPEG quality. The maximum compression preset uses the lowest resolution and lowest quality of the three, prioritizing size over sharpness, still perfectly readable on screen for most documents, but it may not print as crisply as the original on a full page.
If the result still does not fit the limit you need (say, an email attachment cap), the target-size mode inside the tool itself tries even more specific combinations until it finds the best quality that fits the exact number of megabytes you set.

How much maximum compression usually reduces

50-page scanned PDF

Input: 40 MB
Expected output: ~6 a 9 MB

Large scanned documents usually have the widest margin for reduction with this preset.

PDF already optimized by another tool

Input: 2 MB
Expected output: ~1.8 MB (ganho marginal)

When the gain falls under 5%, the tool warns that compressing again is probably not worth it.

Full tool FAQ

Does the compressor work well for every kind of PDF?

No, and the tool warns you before you waste any time. Scanned or photo-heavy PDFs usually shrink a lot, because the source image had more resolution than needed. A PDF generated from Word, LaTeX or Google Docs, made almost entirely of vector text, tends to get worse with resampling-based compression, because the only way to compress without a server is to rasterize every page, turning crisp, searchable text into a blurry image. The tool analyzes the document first and classifies the verdict as mostly image, mixed, or mostly vector text.

Is my file uploaded to a server during compression?

What does the warning that compression was not worth it mean?

How does target-size mode (say, under 2 MB) work?

Can I compress several PDFs at once?

What does removing metadata, attachments and thumbnails do, and does it rasterize the PDF?

Can I see the quality difference before downloading the compressed file?

Does the tool work with password-protected PDFs?

Frequently asked questions

Does maximum compression make the text unreadable?

No, it reduces sharpness compared to the original, but the text of a normal scanned document is still readable on screen. To check before downloading, the tool shows a side-by-side preview of the original and compressed page.

Can I fine-tune manually instead of using the preset?

Yes, the manual mode inside the tool exposes the DPI and JPEG quality controls separately, for anyone who wants a middle ground between the three presets.

Next steps

What the maximum compression preset changes

Each preset combines a resampling resolution (DPI) with a JPEG quality. The maximum compression preset uses the lowest resolution and lowest quality of the three, prioritizing size over sharpness, still perfectly readable on screen for most documents, but it may not print as crisply as the original on a full page.

If the result still does not fit the limit you need (say, an email attachment cap), the target-size mode inside the tool itself tries even more specific combinations until it finds the best quality that fits the exact number of megabytes you set.

How much maximum compression usually reduces

50-page scanned PDF

Input: 40 MB
Expected output: ~6 a 9 MB

Large scanned documents usually have the widest margin for reduction with this preset.

PDF already optimized by another tool

Input: 2 MB
Expected output: ~1.8 MB (ganho marginal)

When the gain falls under 5%, the tool warns that compressing again is probably not worth it.

Full tool FAQ

Does the compressor work well for every kind of PDF?

Is my file uploaded to a server during compression?

What does the warning that compression was not worth it mean?

How does target-size mode (say, under 2 MB) work?

Can I compress several PDFs at once?

What does removing metadata, attachments and thumbnails do, and does it rasterize the PDF?

Can I see the quality difference before downloading the compressed file?

Does the tool work with password-protected PDFs?

Frequently asked questions

Does maximum compression make the text unreadable?

Can I fine-tune manually instead of using the preset?

Yes, the manual mode inside the tool exposes the DPI and JPEG quality controls separately, for anyone who wants a middle ground between the three presets.