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Reduce PDF file size without losing quality.
Compress PDF is a free browser-based tool that helps you reduce pdf file size without losing quality. It is part of ToolsMonk's pdf tools collection, so you can finish the job without downloading software, creating an account, or jumping between multiple websites.
This tool is especially useful for workflows such as shrinking a pdf below the 25 mb gmail / 10 mb form-upload limit so it sends or attaches without error, compressing scanned documents and image-heavy brochures that balloon to tens of megabytes, and reducing portfolio, proposal, and presentation pdfs so they load fast on the web and on slow connections. Because it runs directly in your browser, you can use it on desktop, tablet, or mobile while keeping the process fast and easy for one-off tasks as well as repeat work.
Compress PDF is also a strong fit for people searching for compress pdf, reduce pdf size, and pdf compressor, because it combines a simple interface with instant results and privacy-friendly processing.
Drag your PDF into the upload area (or click to browse) — it loads locally in your browser, nothing is sent anywhere
Pick a compression level: Low to preserve maximum quality, Medium for everyday use, or High for the smallest file
Click Compress — the tool re-encodes images and rebuilds the PDF structure in seconds
Check the before/after size and reduction percentage, then download your compressed PDF
Three compression levels — Low (light optimisation, near-original quality), Medium (balanced size and quality), and High (smallest possible file)
Downsamples and re-encodes embedded images, the main cause of large PDFs, while keeping text crisp and selectable
Strips redundant metadata, unused objects, and duplicate resources to shrink the file structure itself
Shows exact before/after file size and the percentage reduction so you can verify the result instantly
Runs entirely in your browser with pdf-lib — your document is never uploaded, making it safe for contracts, statements, and confidential files
Handles multi-megabyte and image-heavy PDFs without queues, email verification, or daily caps
Shrinking a PDF below the 25 MB Gmail / 10 MB form-upload limit so it sends or attaches without error
Compressing scanned documents and image-heavy brochures that balloon to tens of megabytes
Reducing portfolio, proposal, and presentation PDFs so they load fast on the web and on slow connections
Preparing lighter PDFs for government, banking, and job-application portals that reject large files
Compress PDF is a powerful free online tool available on ToolsMonk that helps you reduce pdf file size without losing quality. Whether you're a professional, student, or casual user, our compress pdf provides instant, accurate results right in your browser without requiring any software installation or account creation.
As part of our PDF Tools collection, this tool is designed with simplicity and power in mind. All processing happens client-side, ensuring your data remains completely private and secure. The tool works seamlessly across all modern browsers on desktop, tablet, and mobile devices.
Compress PDF reduces the file size of a PDF by re-encoding the images inside it and rebuilding the document's internal structure, all without uploading your file anywhere. Large PDFs are almost always large because of embedded images and scans, so the tool focuses its savings there while leaving text sharp and selectable.
Choosing a level is simple. Low does light optimisation for when quality matters more than size. Medium is the everyday choice — a strong size reduction you generally can't see. High squeezes the file as small as possible for strict upload limits, accepting slightly softer images in return. After processing you'll see the original size, the new size, and the exact percentage saved.
Because everything runs locally in your browser with the pdf-lib library, your document never touches a server. That makes Compress PDF safe for confidential material — contracts, financial statements, IDs, and medical records — that you would not want to upload to an online service.
Compress PDF pairs naturally with the rest of the ToolsMonk PDF suite. Merge several files first and then compress the result, or split a long report and compress only the section you need to share. There are no signups, watermarks, or usage caps at any step.
Start with Medium — it gives most of the size saving with quality you usually can't tell apart from the original; only drop to High if you must hit a strict size limit
For scanned documents, High compression delivers the biggest wins because scans are stored as full-page images
If you need both a smaller size AND fewer pages, run Compress PDF after Split or Merge so you optimise the final document once
Common questions about this tool, its workflow, and what to expect before you use it.
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