PDF Compressor

A PDF Compressor is a tool that reduces the file size of a PDF document without changing its content. It works by removing redundant data, stripping unnecessary metadata, and repacking internal file streams more efficiently. The result is a smaller PDF that is faster to upload, share, and open — while looking identical to the original.

Large PDF files create friction at every step — they take longer to email, eat up storage space, slow down web page loads, and often hit attachment size limits. Compressing your PDFs makes them easier to share with colleagues or clients, faster to upload to cloud storage or web platforms, lighter on mobile data when accessed on the go, and more manageable when storing dozens or hundreds of documents. For businesses handling contracts, reports, or design files daily, even modest file size reductions add up significantly over time.

Load File / From URL — Switch between uploading a PDF from your device or fetching one directly from a web address.
Browse — Opens your file picker so you can select a local PDF file.
Clear — Removes the currently loaded file and resets the tool so you can start fresh.
Compression Preset buttons (Screen, eBook, Printer, Prepress) — Quickly set the target quality level. Screen produces the smallest file size, suited for on-screen reading. eBook balances size and quality for general use. Printer retains higher quality for printed output. Prepress is the least aggressive, preserving maximum fidelity for professional print workflows.
Strip Metadata — Removes hidden document information such as author name, creation date, software used, and keywords. Useful for privacy and reducing file overhead.
Remove Unused — Clears out orphaned objects inside the PDF that are no longer referenced by any page, freeing up space without affecting visible content.
Web Optimise — Restructures the PDF so it can begin rendering in a browser before the full file has finished downloading, improving load performance for online documents.
Pack Streams — Applies stream compression to internal PDF data structures, reducing the raw byte size of the file’s building blocks.
Compress PDF — Runs the compression process using the selected preset and options.
Download PDF — Saves the compressed file to your device as a new .compressed.pdf file.

Yes, the tool runs entirely in your browser so there are no server-side upload limits. That said, very large files — typically above 50–100 MB — may take longer to process and will depend on the memory and processing power of your device. For extremely large, image-heavy PDFs, the in-browser compression will still work, but the savings may be smaller than with a server-side tool like Ghostscript, which can re-encode embedded images at lower resolutions. For most everyday documents — reports, contracts, presentations, and forms — the tool handles them quickly and reliably.

The tool processes your PDF entirely inside your browser using pdf-lib, an open-source JavaScript library. No file is ever uploaded to a server. When you click Compress PDF, the tool loads the document into memory, optionally strips metadata fields such as author and title, removes any unused internal objects that take up space without contributing to the document’s content, and repacks the PDF’s internal data streams using object stream compression. The result is written out as a new, leaner PDF file that you can download immediately. Because compression happens client-side, your documents stay completely private throughout the process.

Completely. It’s a single HTML file that runs entirely in your browser with no account, no backend, no telemetry, and no cost. You can save it to your desktop and use it offline indefinitely.