How much will compression reduce my PDF?

Results vary. Text-heavy PDFs often see 10–40% reduction. Scanned or image-heavy PDFs may compress less since those images are already optimised.

Is my PDF safe when compressing online?

Yes. Compression runs entirely in your browser. Your file is never sent to a server.

What is the maximum PDF size I can compress?

There is no enforced size limit, but very large PDFs (100 MB+) may take longer since processing happens in your browser.

Free online PDF compressor — no sign-up needed

Compress PDF Online Free

Reduce your PDF file size instantly in your browser. No upload to any server — your file stays private on your device. Works on Windows, Mac, iPhone, and Android.

Free local PDF tool

Compress PDF

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How to Compress a PDF in 3 Steps

Select your PDF — drag it onto the box above or click "Select file".
Click Compress PDF — your browser rewrites the PDF to reduce its size.
Download — save the smaller file to your device.

No software to install. No account required. Compression takes under 30 seconds for most files.

For a deeper guide, read: How to Compress a PDF Without Losing Quality.

Best for text PDFs

Browser compression works best on contracts, reports, forms, and other text-heavy documents with unused PDF objects or metadata.

Scans may not shrink much

Image-only scans are often already dominated by JPEG data. A desktop tool that can downsample images may be better for those files.

Quality is preserved

GoToPDF rewrites compatible PDF structure without lowering image resolution, so visible quality normally stays the same.

Frequently Asked Questions — Compress PDF

How do I compress a PDF for free?

Drop your file into the tool above, click Compress PDF, and download the result. Completely free, no sign-up.

How much will it reduce my file size?

Results vary. Text PDFs often shrink 10–40%. Scanned or already-compressed PDFs may see less reduction.

Will quality be affected?

The browser compressor rewrites the PDF structure without re-encoding images, so visual quality is generally preserved.

Is my file safe?

Yes. Everything runs in your browser. Your file is never sent to any server.

What is the file size limit?

No enforced limit, but very large files (100 MB+) may take longer since processing happens in your browser.

Why didn't my PDF get smaller?

Some PDFs are already optimised and can't be reduced further in the browser. Server-based tools may achieve better results for image-heavy PDFs.