Feature landing page

Free PDF Compressor

Reduce PDF size online with safer defaults first, then move to stronger compression only when you need more savings.

Strict, balanced, and maximum compression modes.Optional image recompression and downsampling controls.Optimize up to 4 PDF files in one job.

Start PDF compression

Why start with strict mode?

Strict mode is often the safest starting point when you want the PDF to keep looking as close to the original as possible.

When should you use stronger compression?

Stronger compression can help when the file is still too large for upload, email, or everyday sharing after a gentler first try.

Supported formats and input limits

This section summarizes the current public workflow limits and format behavior.

Supported formats and modes

Item	Current behavior
Accepted uploads	PDF
Compression modes	Strict / Balanced / Maximum Compression
Main purpose	Reduce PDF size while keeping the document shareable and readable
Extra controls	Image recompression and DPI controls can appear in stronger modes

Current input limits

Item	Current behavior
Files per job	4 files
Max file size	Up to 200MB per PDF
Output	Optimized PDF per uploaded file
Best fit	Large proposals, scans, manuals, and shareable documents

Practical situations where this helps

These examples show where the tool fits into everyday work and publishing flows.

Email attachments that feel too large

A lighter PDF can be easier to send through email or messenger when the original file is too heavy.

Upload limits in portals or submission forms

A compressed PDF can help you pass size limits in vendor portals, admin systems, or upload forms.

Everyday document sharing

For scans, internal decks, or practical working files, reducing size can make repeated sharing easier.

How it differs from nearby formats or modes

This explains where the current flow fits compared with nearby alternatives.

Strict vs Balanced

Strict is safer when appearance matters most. Balanced is more useful when the file is still too large after a safer first try.

Balanced vs Maximum Compression

Balanced is often the practical middle ground. Maximum Compression is for cases where the smallest possible file matters more than preserving every small detail.

Common reasons a job can fail

These are the common public-workflow limits and failure patterns users may run into.

The file is too large

If the PDF is larger than 200MB, the job may stop before processing begins.

The file is not really a valid PDF

A broken or incomplete PDF can fail during processing even if it looks like a PDF file by name.

The document needs more time than the public workflow allows

Very complex documents can be harder to process in a lightweight public conversion flow.

The upload does not complete

If the browser upload does not finish properly, compression cannot start.

Temporary processing and deletion summary

This PDF tool is meant for temporary processing, not permanent storage.

Uploaded source files are used only for temporary conversion work and are normally removed within about 24 hours.
Converted result files and related job information stay available only for a limited period and can be cleaned up after a few days.
This service is a processing tool, not a permanent storage space, so it is best to download the files you need as soon as they are ready.

FAQ

Should I start with strict?

Yes, in many cases strict is the safest first try.

Will all PDFs shrink by the same amount?

No. The result depends on the content inside the PDF.

Can I upload several PDFs together?

Yes. Up to 4 PDF files are supported per job.

Should I keep the final file elsewhere?

Yes. It is better to download it promptly and keep your own copy.

Related guides

These guides can help you understand the feature more clearly or choose better settings.