Compress PDF Online

Compress PDF Online lets you compress pdf files online — with a real quality slider. It runs entirely inside your browser so your files stay on your device — nothing is uploaded to a server.

Yes. Compress PDF Online is 100% free, with no signup, no watermark and no daily limit. You can process as many PDFs as you want.

No. Compress PDF Online is a web-based tool that works in any modern browser — Chrome, Edge, Safari, Firefox and Brave — on Windows, macOS, Linux, Android and iOS.

Yes. Compress PDF Online processes every file on the client side using JavaScript. Your PDF is never uploaded, stored or shared. Close the tab and it's gone.

Yes. Compress PDF Online is fully responsive and works on Android phones, iPhones and iPads. Just open the page in your browser and pick a file.

We recommend files under 100 MB for the smoothest experience. Larger files may work but can slow down older devices because everything is processed in your browser.

Compress PDF Online keeps the original quality wherever possible. Any quality trade-offs (for example when compressing or exporting to images) are clearly labelled and controlled by you.

You need internet to load the page the first time. After that, most processing happens locally in your browser — the PDF itself never travels over the network.

No. Files produced by Compress PDF Online are clean, watermark-free and safe to share professionally or submit to official portals.

Yes. There are no licensing restrictions on the output — use it for freelance projects, agency work, client deliverables or internal business documents.

Compress PDF Online supports standard PDF 1.4–1.7 files created by Word, Google Docs, Adobe Acrobat, printers, scanners and mobile apps. Encrypted PDFs must be unlocked first.

For security we don't process encrypted PDFs. Use our PDF Password Remover first (if you have the password), then run the file through Compress PDF Online.

Yes — where it makes sense (for example merging or converting), Compress PDF Online accepts multiple files at once and processes them in a single click.

Any Chromium-based browser (Chrome, Edge, Brave, Opera) or the latest Safari and Firefox will give the best speed. Older browsers may lack the modern APIs the tool relies on.

Structural features like bookmarks, hyperlinks and metadata are preserved wherever the operation allows. Conversions to image formats (JPG, PNG, PPT) naturally flatten these into pixels.

Most PDFs under 20 MB finish in a few seconds on a modern laptop or phone. Larger files take proportionally longer because everything is computed on your device.

Compress PDF Online never modifies your original file — it creates a new PDF and downloads it. Your source file on disk stays exactly as it was.

We can't — nothing is uploaded. There are no server logs of your file names or contents because your PDF never leaves the browser tab.

For quick one-off jobs, Compress PDF Online is faster: no install, no license, no waiting. Acrobat is still the choice for heavy editing workflows — Compress PDF Online covers 90% of everyday needs.

Use the contact page linked in the footer. We read every message and roll fixes and improvements into Compress PDF Online regularly.