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PDF Tools / Beta

Compress PDF Online

Reduce PDF size with three quality levels and an optional target-size goal.

Quick answer

What does Compress PDF do?

Reduce PDF size locally with Balanced quality, Keep original quality, or Maximum compression, plus an optional target-size goal. No exact final size is guaranteed: already-optimized files may shrink only slightly, while stronger image recompression can reduce visual detail.

Use Compress PDF when you need to reduce PDF file size while controlling quality. Common uses include meet an email attachment limit, create a smaller copy for a portal upload, reduce image-heavy reports before sharing.

Input: PDF files
Processing: In this browser
File upload: No
Price: Free

Designed around the task

Why use Compress PDF?

Focused controls, local processing, and clear limits help you finish the job without sending the document to a conversion server.

Focused results

First tries structural PDF optimization that preserves original page objects.

Useful browser controls

When needed, image-heavy pages can be rebuilt at progressively lower image quality to approach the selected target.

Desktop and mobile

Use Compress PDF in a current desktop or mobile browser without installing a separate app.

Simple local workflow

Create an output you can inspect before sharing.

Private by design

The selected PDF files are processed by JavaScript running in this browser for Compress PDF. NoLogPDF does not send them to a backend conversion API, and file names, contents, form values, passwords, and output data are excluded from site analytics.

Automatic file recognition

NoLogPDF checks the selected file in your browser and shows the controls available for Compress PDF.

How to use Compress PDF

Choose one or more PDF files and check their original sizes.
Choose Balanced quality, Keep original quality, or Maximum compression.
Set a desired output size when image recompression is available.
Choose Compress PDFs, compare each result, and download the files.

What Compress PDF changes

First tries structural PDF optimization that preserves original page objects.
When needed, image-heavy pages can be rebuilt at progressively lower image quality to approach the selected target.

Browser-only privacy

Limits to know before using Compress PDF

A target size is a goal, not a guarantee, because fonts, vectors, images, and existing compression constrain the result.
Maximum compression can reduce image clarity, and a rasterized fallback can make text non-selectable.

Practical guidance

Choose compression settings for the kind of PDF you have

Image-heavy scans usually offer the largest savings because their page images can be recompressed. Text-first PDFs may already be compact, so aggressive settings can change appearance without producing a dramatic reduction. Keep the original file and compare the result at normal reading zoom.

Recommended workflow

Use balanced settings for email and routine document sharing.
Use stronger image compression for scans, photo reports, and image-based handouts.
Delete unnecessary pages before compression when the content itself can be reduced.

Check the result

Compare the original and output file sizes rather than assuming every PDF will shrink.
Inspect small text, diagrams, signatures, and scanned stamps for visible artifacts.
Choose a lighter setting when readability matters more than reaching a target size.

Common uses for Compress PDF

Meet an email attachment limit.
Create a smaller copy for a portal upload.
Reduce image-heavy reports before sharing.

Next step: Remove pages you do not need before reducing the file size.

Compress PDF questions

How does Compress PDF work?

Reduce PDF size with three quality levels and an optional target-size goal. Choose one or more PDF files and check their original sizes. Choose Balanced quality, Keep original quality, or Maximum compression. Set a desired output size when image recompression is available.

Does Compress PDF upload my PDF files?

No. The selected PDF files are read by code running in this browser for this operation. NoLogPDF does not send them to a backend conversion API or include document data in analytics.

What does Compress PDF change in the output?

First tries structural PDF optimization that preserves original page objects. When needed, image-heavy pages can be rebuilt at progressively lower image quality to approach the selected target.

What limits should I know before using Compress PDF?

A target size is a goal, not a guarantee, because fonts, vectors, images, and existing compression constrain the result. Maximum compression can reduce image clarity, and a rasterized fallback can make text non-selectable.

Published and maintained by NoLogPDF

How this tool page is checked

The instructions describe this browser implementation, its expected output, and its known limits. Core workflows are exercised with local fixtures, output files are validated where the format allows, and mobile behavior is checked at a narrow viewport.