How do I compress a PDF for free?

With EdgeDocs, you can compress any PDF for free. Open your file in the Compress PDF tool, select from three compression levels (Low, Medium, or High), and see the results instantly. EdgeDocs shows you the original size, compressed size, and percentage reduction before you download. Free users get 3 downloads per day — and unlike most online compressors, everything is processed in your browser and your file is never uploaded to a server.

Will compressing a PDF reduce its quality?

It depends on the compression level you choose. Low compression reduces file size with minimal visible quality loss — ideal for most documents. Medium and High compression achieve smaller files by reducing image resolution and quality, which may affect image-heavy PDFs. EdgeDocs shows you the exact file size reduction and percentage saved after processing, so you can try different levels and pick the result that works best.

Is it safe to compress PDFs online?

Most online PDF compressors upload your file to their servers for processing, which means your document passes through third-party infrastructure — even if they promise to delete it later. EdgeDocs is different: compression happens entirely in your browser using local processing. Your file never leaves your device, so there's zero risk of server-side exposure, interception, or data retention.

How do I compress a PDF to email it?

Most email providers have attachment size limits — Gmail allows 25MB, Outlook allows 20MB. Open your PDF in EdgeDocs' Compress PDF tool, select a compression level that brings the file under your provider's limit, and download the compressed version. EdgeDocs shows you the exact compressed file size so you'll know immediately if it fits. Since processing is instant and local, there's no upload wait time.

Can I compress a PDF without uploading it to a server?

Yes — that's exactly what EdgeDocs is built for. Our Compress PDF tool runs entirely in your browser. Your file is processed locally on your device and is never sent to any server. This makes EdgeDocs the safest option for compressing confidential documents, legal files, medical records, or anything containing sensitive information.

What's the difference between lossless and lossy PDF compression?

Lossless compression reduces file size by optimizing the internal structure of the PDF — removing redundant data, compressing streams, and subsetting fonts — without any quality loss. Lossy compression goes further by reducing image resolution and re-encoding images at lower quality, which produces smaller files but may affect image-heavy documents. EdgeDocs offers three compression levels so you can choose the right trade-off for your document.

Compress PDF — Reduce File Size Without Uploading

Reduce file size by compressing images. All processing happens in your browser.

Free: 25MB file limit

This tool compresses PDFs by optimizing images. Text-heavy documents may see smaller reductions. For best results, use on PDFs with images or scanned documents.

Drop PDF files here or click to browse

Maximum file size: 25MB

🔒 Your files never leave your browser. All processing is done locally.

Works Offline

Network requests during processing: 0

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