Lottinier Docs
Free browser-based document compressor

Compress Office documents without uploading them

Shrink DOCX, PPTX and XLSX files for email and sharing. Compression runs locally in your browser, so your documents never leave your device.

Private document compressation, by design

  • Your files stay on your device

    There is no upload step. Each document is read and processed without ever leaving your browser.

  • No queue, no waiting room

    Processing starts the moment you press the button, because nothing has to travel to a server first.

  • Free, with no account

    No signup, no subscription and no watermark.

  • Works on any modern browser

    Nothing to install on Chrome, Edge, Firefox or Safari, on both desktop and mobile.

Basic, Balanced and Heavy Compression

Every level trades size against quality differently. Pick the trade-off that fits how you will share the file.

Basic Compression

Gentler settings.

Keeps more detail, so savings are usually smaller.

Balanced Compression

Default balance.

Usually the largest saving you can take without obvious quality loss.

Heavy Compression

Most aggressive.

The smallest practical file, with more visible quality loss.

How it works

  1. 1

    Choose a document

    Drag a file onto the panel or pick one from your device. It is read locally, not uploaded.

  2. 2

    Pick a level

    Basic, Balanced or Heavy. Balanced is selected by default.

  3. 3

    Download the result

    You see the real before and after sizes, then save the file straight to your device.

Frequently asked questions

Are my documents uploaded to a server?+

No. Lottinier Docs has no backend for file processing. Your file is read by your browser and processed on your device.

Is Lottinier Docs free?+

Yes. There is no account, no subscription and no watermark.

Which formats are supported?+

DOCX, PPTX and XLSX (Office Open XML) are accepted as input.

Are my files stored anywhere?+

No. Nothing is written to a server, a database or cloud storage. When you close or reload the tab, every trace of the file is gone.

Drop your documents here

or choose files — everything is processed on your device

Files are not uploaded or stored. No signup required.

More Lottinier tools

The same privacy-first approach across the Lottinier product family.