Compress PDF Files Online
Reduce PDF file size in your browser: lossless optimise, or rasterise pages at a chosen quality. The original and result sizes are always shown honestly.
How to use
The whole flow runs in your browser — nothing is uploaded.
- UploadAdd the PDF file you want to shrink.
- Choose a modeLossless optimise keeps text and vectors; rasterise pages re-draws each page as a JPEG for much smaller files.
- CompressPress Compress PDF and watch the real result size appear.
- DownloadSave the compressed PDF — the original file is untouched.
- Every step runs locally in your browser.
Key Features
Shrink a PDF's file size, or rasterise it when you need it smaller. Everything runs client-side on your own device.
- Honest size reportingThe exact original and result sizes are always shown — including when no reduction is possible.
- Two real strategiesLossless structure optimisation, or page rasterisation with a quality slider.
- Quality controlChoose the rasterisation DPI and JPEG quality for the size/quality trade-off you want.
- Runs in your browserNo upload, no queue, no email — everything happens locally.
Frequently asked questions
It depends on the file. Lossless optimisation usually saves a few percent on files that store their structure inefficiently and nothing at all on already-optimised ones. Rasterising pages typically reduces size far more, especially for scans.
Each page is rendered to an image and rebuilt as a JPEG inside a new PDF. Vector graphics, selectable text and links are replaced by the picture — which is why the size drops sharply.
No. If the result is not smaller than the original, the tool says so and you can keep your original file.
Never. Compression runs on your own device.