✦ PDF Tools
English

Compress PDF

Reduce the size of your PDF file. Standard compression keeps quality and searchable text; the optional strong mode achieves maximum savings – all locally in your browser.

Updated: August 2026

  • 100% browser-based Your files never leave your device.
  • No registration Start instantly – no account, no login.
  • Privacy first No upload, no storage on servers.

Process PDF

Select a PDF file to compress it.

Compression mode:

Key features

  • Standard or strong mode Lossless standard compression or maximum size reduction.
  • Text stays searchable In standard mode, text and quality stay fully intact.
  • Quality slider In strong mode you control the quality yourself.
  • 100% local processing No file ever leaves your browser.
  • Free, no sign-up Free forever, no registration.
  • → Smaller email attachments: Send large documents without size limits.
  • → Faster uploading: Ideal for portals with file size limits.
  • → Private and secure: Confidential content never leaves your device.

Notes & limitations

  • • Strong mode turns pages into images: Text selection is no longer possible afterwards.
  • • Pure text PDFs shrink very little: They are already highly compressed.

How it works

Three steps to a finished PDF – no sign-up.

  1. 01

    Choose a file

    Drag & drop your PDF into the field or pick it from your device.

  2. 02

    Run the tool

    Adjust options and click Process – everything runs locally in your browser.

  3. 03

    Download

    Save the finished PDF straight to your device.

How does PDF compression work?

Our free tool compresses PDFs entirely in your browser – no upload. By default the file is repacked losslessly: redundant objects are consolidated, object streams compressed and metadata cleaned up. Text stays searchable and quality is unchanged.

When you need maximum savings, choose Strong mode. Every page is converted into a high-quality image and re-embedded. This shrinks the file considerably, but the text becomes part of the image – text selection is no longer possible.

When does strong compression make sense?

Strong compression is best for scanned documents and image-heavy PDFs that have no text layer anyway. For contracts, invoices or other documents where text should remain selectable and copyable, standard compression is the better choice.

Is compression safe?

Yes. Because processing happens only in your browser, your file never leaves your device. We store nothing on our servers.

Is this tool free?

Yes. PDF compression is free forever and requires no registration. There are no hidden size limits.

Related tools

More tools

Related articles

Frequently asked questions

Is this tool really free?
Yes. Compressing PDF files is completely free and requires no registration.
Are my files uploaded?
No. All files are processed locally in your browser. Nothing is uploaded to our servers.
What is the difference between standard and strong compression?
Standard compression repacks the PDF losslessly and keeps searchable text. Strong compression converts every page into an image for maximum size reduction – but text selection may be lost.
Do I lose quality when compressing?
Standard compression keeps quality fully intact. Strong compression may slightly reduce quality, so choose it only when file size matters more.
How much can a PDF be compressed?
It depends on the content. Files with large images or scans compress well; pure text PDFs are already compact and shrink very little.
What file types can be compressed?
All PDF files – whether they contain text, images or scans.
What is the difference to PDF repair or optimization?
Our tool focuses on size reduction; the content stays unchanged.
Can I control the quality myself?
Yes. In strong mode you can adjust the quality with a slider.
Does compression work on mobile?
Yes. Because everything runs in the browser, it works on every device.