Where does the processing actually happen?

In this tab. The file is read locally, converted or edited locally, and handed back as a download — no copy is sent to a server, so there is nothing for anyone to breach or keep.

Will it work on a phone?

Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.

Will I notice a quality difference?

Re-encoding always costs something, so start at the lighter setting and only push further if the size is still wrong. The before-and-after figures on the page are the honest way to decide.

Because the expensive part — the server farm — does not exist. Processing runs on your device, so the site can stay free without a signup wall in front of it or an upsell in the middle of a job.

Custom PDF Compression

Pick DPI and JPEG quality yourself.

Drag & drop your PDF here

or click to browse — .pdf · up to 1 files

Render resolution: 120 dpi120JPEG quality: 70%70

Custom mode renders each page as a compact image — real savings on scan-heavy files, but text stops being selectable.

Add a PDF first.

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About Custom PDF Compression

Custom PDF Compression is here for making a document lighter without wrecking it: pick DPI and JPEG quality yourself. It takes PDF and produces PDF. Nothing is sent anywhere: the browser reads the file, does the work and hands the result back.

The slow route to making a document lighter without wrecking it is installing something, making an account and uploading the file; this is the fast route.

How to use Custom PDF Compression in 3 steps

Drop the file on the page — PDF, one file up to 100 MB.
Set Compression strength — low, recommended, extreme, or custom, which then exposes Render resolution and JPEG quality.
Press Compress PDF and download the PDF result.

What you get with Custom PDF Compression

One job, done in the browser: pick DPI and JPEG quality yourself.
Free to use, with no signup and no account
No watermark or logo added to your output
Works on desktop and mobile, no install

Custom PDF Compression: questions

Where does the processing actually happen?: In this tab. The file is read locally, converted or edited locally, and handed back as a download — no copy is sent to a server, so there is nothing for anyone to breach or keep.
Will it work on a phone?: Yes. The layout adapts to a small screen and the processing runs in the mobile browser, so a photo or a downloaded document can be handled on the device it arrived on.
Will I notice a quality difference?: Re-encoding always costs something, so start at the lighter setting and only push further if the size is still wrong. The before-and-after figures on the page are the honest way to decide.
Why is it free?: Because the expensive part — the server farm — does not exist. Processing runs on your device, so the site can stay free without a signup wall in front of it or an upsell in the middle of a job.