PDF Compressor

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Compress large PDFs right in your browser. Drop in a PDF and this tool re-renders every page, downsamples its images to the resolution you choose, and re-encodes them as efficient JPEGs at an adjustable quality — then rebuilds a fresh document that also drops embedded fonts, metadata, and redundant data left over from the original. You see the exact before and after file sizes and how much you saved before downloading. It works especially well on scanned documents and image-heavy PDFs that are far larger than they need to be. Everything runs locally on your device, so your documents are never uploaded to a server and even confidential files stay private.

100% private: your PDF is read and re-compressed directly in this browser tab and never uploaded.

Drag & drop a PDF here
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How to use

Drag and drop your PDF, choose a resolution (lower shrinks the file more) and an image quality, then click Compress PDF. The tool shows the original size next to the compressed size and the percentage saved. If you're happy with it, click Download to save the smaller file; if the savings aren't enough, try a lower resolution or quality and compress again.

Frequently asked questions

Is my PDF uploaded anywhere?
No. The PDF is read, rendered, and re-compressed entirely in your browser using your device's own processing. Your file is never sent to a server, which makes this safe for confidential and sensitive documents.
How does the compression work?
Each page is rendered to an image, downsampled to your chosen resolution, and re-encoded as a JPEG at your chosen quality, then placed back into a brand-new PDF at the page's original dimensions. Because the document is rebuilt from scratch, embedded fonts, metadata, and orphaned objects from the original are stripped out too. This is most effective on scans and image-heavy PDFs.
Why did my PDF get bigger instead of smaller?
Text-only PDFs store text as compact glyph instructions, which are often smaller than a picture of the same page. Rasterising those pages can produce a larger file, so the tool warns you when the result didn't shrink and lets you keep the original. Lowering the resolution or quality usually helps, but for pure text documents the original is frequently already the smallest option.