Compress PDF
Reduce PDF file size without losing quality. All processing happens in your browser — your files never leave your device.
How to compress a PDF file
Three steps from upload to smaller file. No signup, no installs.
Drag one or more PDFs into the dropzone, or click to browse. Up to 10 files at once. No file size cap.
Pick Light, Recommended, Strong, or Extreme. Preview the Before vs After thumbnail to validate quality.
Click Compress PDF. Download each file individually or grab all as a ZIP. See exact savings in the result card.
Compress PDF Files Online — Free & Private
PDF files accumulate size fast — embedded fonts, high-resolution images, and duplicate object streams all add overhead that most readers never need. Our compressor strips that overhead and re-encodes image content at a quality level you control, producing files that are typically 20–80% smaller while remaining perfectly readable.
Every byte of your document stays on your device. The tool runs entirely in-browser using PDF-lib and PDF.js — no server ever receives your file. When you close the tab, the data is gone. There is no account, no upload queue, and no watermark.
The four compression levels cover every use case: Light is ideal for archiving signed contracts where quality must be pristine. Recommended suits most everyday documents — presentations, reports, invoices. Strong and Extreme are best for email attachments and web delivery where file size matters most.
Why Use Our PDF Compressor?
Built for speed, privacy, and simplicity — everything you need, nothing you don't.
Your files never leave your device. All compression happens in your browser — no uploads, no servers, no data stored anywhere.
Compression runs at native browser speed. Most documents finish in under two seconds, even on mobile hardware.
Compress unlimited PDFs with no file size cap, no account required, and no daily usage limits — free forever.
iPhone, Android, Mac, Windows — if it has a modern browser, it works. No app to download, no plugin to install.
Light preserves near-perfect quality. Extreme achieves maximum reduction. Choose the right trade-off for each document.
See a side-by-side thumbnail comparison before downloading — so you can verify quality looks right for your use case.
Related PDF tools
Free, browser-based, and built the same way as Compress PDF.
Frequently Asked Questions
Yes. There is no signup, no trial period, and no watermarks added to your files. Compress as many PDFs as you need — there are no daily or monthly limits.
Nothing is uploaded anywhere. All compression runs locally in your browser using PDF-lib and PDF.js. Your files never leave your device, and closing the tab erases everything. We cannot see your documents.
Use Light for contracts, legal documents, or anything where quality must be pristine. Recommended works well for presentations, reports, and invoices. Strong is good for email attachments. Extreme is best for archiving scanned documents where every kilobyte matters.
It depends on the content. Image-heavy and scanned PDFs typically shrink by 50–80%. Text-only or already-compressed PDFs see 10–30% reduction. The result card shows your exact before and after file sizes and percentage saved.
Absolutely. The tool is fully responsive and works on iOS Safari, Android Chrome, and every modern mobile browser. The compressed file can be saved directly to your Files app on iPhone via the Share button.
Yes — upload up to 10 PDF files in one session. All files are compressed sequentially with the same settings. When finished you can download each file individually or grab them all as a ZIP archive.