About pdfcompressor.cc: Private PDF Tools in Your Browser

Our Mission

We build free, privacy-first PDF tools that anyone can use in a browser: no signup, no installation, and no need to trust a server with your documents. Every tool runs entirely on your own device, so your files stay under your control from the moment you open them to the moment you download the result.

Why Client-Side Processing Matters

Most online PDF tools upload your file to a server, process it there and send the result back, so your document exists, at least briefly, on someone else's infrastructure. pdfcompressor.cc works differently: PDFs are processed in your browser using Web Workers, so the file is never transmitted or stored on a server. The website itself uses analytics and advertising cookies, described in the Privacy Policy; they never involve your files.

How it works

The tools use pdf-lib to read and rewrite PDF structure, running inside Web Workers so that heavy processing does not block the page; pdf.js renders pages where an image is needed. The site is built with Next.js and TypeScript. For compression, the PDF is re-saved with object streams and its embedded JPEG images are re-encoded, as detailed below.

What You Can Do Here

The core tool is PDF compression. You can also compress to an exact file size, merge several PDFs into one, split a PDF into parts, rotate pages, add a text watermark, extract specific pages, and convert PDF pages to PNG or JPG images. Every tool runs in your browser, with no upload and no queue.

Who runs this site

pdfcompressor.cc is run by a small independent team. We do not publish individual names on this site. You can reach us at [email protected], and our mailing address is in the Privacy Policy. The tools are free to use and supported by advertising.

How it works and where it stops

What the compressor does to your file, and what it deliberately leaves alone:

• Structure: the PDF is re-saved with pdf-lib using object streams, which trims overhead without touching text or fonts.
• Images: embedded JPEG images are re-encoded at 85%, 70% or 50% JPEG quality for Low, Medium and High. Medium and High also cap the longest side at 1600 or 1200 pixels. An image is replaced only if the result is clearly smaller.
• Left unchanged: images with a transparency mask (SMask), CMYK and spot-color images, and images that are not JPEG. This keeps colors and transparency exact, but scans stored in other formats may shrink very little.
• Target size mode: every page is rendered as a JPEG image (quality 35-85%) until the file fits. Text becomes part of the picture and can no longer be selected or searched, and a very small target may be missed. The minimum target is 10KB.
• Not supported: password-protected or encrypted PDFs. Files up to 500MB are accepted, but your device's memory is the real limit.