Compress PDF Online Free — No Sign-Up, No Upload

A large PDF is a daily nuisance: email providers reject attachments over a few megabytes, web forms cap upload sizes, and a slow connection turns a simple share into a long wait. A PDF compressor fixes that by reducing the file size so your document is easier to send, store, and upload — without you having to rebuild it.

To compress a PDF online here, drop your file into the box above and choose a compression level. Low is lossless: it optimizes the PDF's internal structure and object streams while keeping every character of text sharp and selectable — ideal for text documents and reports. Medium and High re-render each page as a compressed image at a lower resolution, which is how scanned contracts, photo-heavy brochures, and image-based PDFs can shrink by well over half. The trade-off is that flattened pages are no longer selectable text, so pick the level that matches how you'll use the file.

Unlike most free PDF compressors, this one never uploads your document. All of the work happens locally in your browser using your device's own processing power, which means two things: your file stays completely private, and there's no upload-and-wait round trip to a server. When compression finishes you'll see the original size, the new size, and the exact percentage you saved, with a one-click download. There are no watermarks, no account, and no daily limit — compress as many PDFs as you need.