Compress PDF
Shrink a PDF (best-effort re-save). 100% in your browser — your file never leaves your device.
We recompress in your browser — your PDF never touches a server.Files are processed on your device only. We never upload or store them. Some conversions (Office, OCR, encryption) are best-effort and may not preserve full layout.
About this tool
Compress PDF helps you trim a file’s size so it is easier to email, upload, or store. It is most useful for PDFs that contain large scanned images, photographs, or heavy embedded graphics. A smaller file slips under email attachment limits and uploads faster on a slow connection. The tool re-saves the document using tighter compression settings applied locally in your browser, so the file never has to leave your device. It works well on image-heavy scans and exports from design tools. Be aware that results vary: a PDF that is already tightly compressed may not shrink much, and aggressive re-compression can soften image detail. We are honest about that — the tool tells you what happened rather than pretending every file gets dramatically smaller. For most everyday documents it is a quick, private way to lighten a file before you send it.
Compression earns its keep at the moment of sending. A scanned signed lease is too big to email, so you shrink it first. A designer exports a portfolio PDF that balloons past a upload limit and needs trimming. A student with a phone photo of notes, saved as a heavy PDF, compresses it to fit a submission portal. An office worker attaches a report to a ticket system that rejects oversized files. In all these cases the aim is practical: get under the limit without leaving the document on a website. Because the re-save is local, even a confidential contract can be lightened on your own machine. We will not pretend a file shrinks when it does not — you get an honest result and decide whether to send it.
How it works & privacy
Press Run and the tool re-saves your PDF with more efficient compression, entirely on your device using pdf-lib. No data is uploaded. The new file downloads to your computer. Whether the size drops depends on how the original was built: image-heavy scans usually shrink the most, while text-only or already-optimized files may stay about the same. We show a note so you are not left guessing.
FAQ
How do I compress a PDF without losing quality?
The tool re-compresses images in your browser. Size reduction depends on the source — scanned images shrink most, while already-optimized files may barely change. We state the result honestly rather than over-promising.
Is my document safe during compression?
Yes. The file is processed locally in your browser and is never uploaded or stored on a server.
Why did my file not get much smaller?
If the original was already compressed or is mostly text, there is little left to trim. Image-heavy scans see the biggest savings.