Make PDFs smaller without uploading them
Large PDFs are awkward to email or attach. The Compress PDF tool rebuilds your document more efficiently to bring the file size down, all inside your browser with pdf-lib. Because there is no server involved, even sensitive files like financial statements or signed agreements can be compressed without ever leaving your device.
When Pixohub re-saves your PDF it uses object streams, a structural optimization that packs the internal objects of the file more tightly. For documents with redundant structure this can trim a meaningful amount of size while keeping every page pixel-for-pixel identical to the original.
Honest expectations about compression
We want to be straightforward: browser-based pdf-lib compression is modest, not magical. It optimizes the file's structure rather than aggressively re-encoding the images inside it, so the savings vary a lot from one document to the next. A text-only PDF that is already well optimized may barely shrink, while a bloated or exported-from-Office file can drop noticeably.
The documents that benefit most are heavy on embedded images. If your PDF is already lean, do not expect a dramatic reduction — that would require aggressive image downsampling, which trades away quality. Our approach keeps your content lossless and your data private. The tool is free, adds no watermark, needs no account, and there are no page limits beyond your device's memory.