Compress PDF
Compress a PDF to a smaller file size with Low, Medium, High or Maximum presets, and see the size reduction before you download. Runs entirely in your browser — no uploads.
Select a PDF to compress
Processed locally in your browser — never uploaded.
Compress a PDF to a smaller file size with Low, Medium, High or Maximum presets, and see the size reduction before you download. Runs entirely in your browser — no uploads. Compress PDF is a free, browser-based tool in the Toolsnest pdf tools collection — there is nothing to install, no account to create and no watermark on your results. It works on desktop, tablet and mobile, and because the work happens on your own device it stays fast even with large inputs.
How to use the Compress PDF
- Open the Compress PDF — no sign-up or software download is required.
- Drag and drop your file(s) into the tool, or click to browse and select them from your device.
- Choose any options you need, such as order, quality, page range or output format.
- Click the action button and let the tool process everything locally in your browser.
- Download the finished file. Your originals are never changed or uploaded.
Why use the Compress PDF?
- 100% free with no limits, no sign-up and no watermarks.
- Private by design — your files are processed in your browser and never uploaded to a server.
- Fast and lightweight, with instant results even on a phone or a slow connection.
- Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
- Part of a full pdf tools suite, so related compress pdf tasks are one click away.
Is it private and secure?
Your privacy is built in. The Compress PDF does all processing on your own device using client-side code, so your files are never transmitted, stored or seen by anyone — including us.
Frequently asked questions
How much can I reduce a PDF's size?
It depends on the content. Scanned/image-heavy PDFs shrink the most at higher levels; text PDFs benefit most from the Lossless option.
Will compression reduce quality?
The rasterised levels (Low–Maximum) reduce image quality to save space and make text part of the page image. Lossless keeps quality and selectable text.
Is my document uploaded?
No — compression happens locally in your browser.