Compress PDF
Reduce PDF file size online for free. No sign-up, no watermark — shrink your PDF for email in seconds while text stays sharp.
Select a file or drop it here
.pdf · up to 25 MB
document.pdf
0 KB
0 images · one per page
Compressing…
This usually takes a few seconds.
Select or drop your PDF file
We compress it on the server in seconds
Download your smaller PDF
Need something else? PDF to Word · Word to PDF
To compress a PDF for free, upload it above and download a smaller version in seconds. The compressor reduces file size by optimizing images while keeping text sharp — image-heavy PDFs often shrink by 70–95%, usually enough to email. If a file cannot be reduced further, you get your original back unchanged. No sign-up, no email, and no watermark.
Compress PDF — free online PDF compressor
Need to compress a PDF so it is small enough to email, upload, or store? Our free PDF compressor reduces your PDF file size in seconds, right in your browser. There is nothing to install, no account to create, and no watermark added to your file. Just upload your PDF, let us compress it on the server, and download the smaller result.
We shrink your file by downsampling images and streamlining how the PDF is stored, using a balanced setting that keeps text sharp and pages clearly readable. Image-heavy PDFs — scans, brochures, presentations — often get much smaller. And if a file is already optimized and cannot be reduced, we simply return your original, so you never end up with a larger file than you started with.
How to compress a PDF online free
Wondering how to compress a PDF free? It takes three simple steps. First, open the compressor above and drop in your PDF file. Second, we compress it on the server in seconds, downsampling images while keeping your text and layout intact. Third, download your smaller PDF — that is it. There is no sign-up, no email verification, and no waiting in a queue. It is the simplest way to make a PDF smaller on any device.
Compress PDF without losing quality
Our goal is a smaller file that still looks great. Text and vector graphics are preserved, and images are re-encoded to a screen-friendly resolution that stays clear on phones, laptops, and printouts. For everyday documents you get a big size reduction with quality that is hard to tell apart from the original — so you can reduce PDF size without losing quality you actually notice.
Why compress a PDF?
A smaller PDF is easier to work with everywhere. It fits under email attachment limits (often around 20–25 MB), uploads faster to forms, portals, and job applications, takes up less space in cloud storage, and downloads quicker for whoever you send it to. If you have ever seen a “file too large” error when attaching a scan or a slide deck, compressing the PDF is usually the quickest fix.
Password-protected, scanned, and large PDFs
A scanned or image PDF is exactly where compression shines — scans carry the most image data, so they see the biggest savings, often 70–95%. A password-protected or encrypted PDF cannot be read directly: remove its password first with our Unlock PDF tool (you need to know the password), then compress it. A large PDF up to 25 MB is supported; if yours is over even that, split it into parts and compress each one.
Free, private, and on every device
This free PDF compressor has no limits, no watermark, and no catch. Your privacy is built in: files are processed in memory and never written to disk or stored, then discarded the moment your download is ready. It works on any device, from Windows and Mac to iPhone and Android. When you need to convert instead of compress, our PDF to Word and Word to PDF tools work exactly the same way.
Frequently asked questions
How do I compress a PDF for free?
Drop your PDF into the box above and it is compressed in seconds. There is no sign-up, no watermark and no cost — just download the smaller file. Our free PDF compressor works entirely online, so there is nothing to install.
How do I reduce the size of a PDF to email it?
Many email services cap attachments at around 20–25 MB. Upload your PDF here, let us compress it, and download a much smaller file that fits within those limits — ideal for sending reports, scans, and presentations by email.
Can I compress a PDF without losing quality?
We use a balanced setting that reduces file size while keeping the document clear and easy to read. Text stays sharp and vector graphics are preserved; only images are downsampled to a sensible resolution. For most everyday documents the difference in quality is hard to notice.
Will compressing reduce the quality of my PDF?
Images are recompressed to a smaller, screen-friendly resolution, so a very high-resolution photo may look slightly softer up close. Text and line art are not affected. If a file cannot be made smaller without harming it, we simply return your original unchanged.
How much smaller will my PDF get?
It depends on what is inside. Image-heavy PDFs — scans, brochures, slide decks — often shrink by 70–95%. PDFs that are mostly text may only reduce a little, because text is already compact. Either way you never get a file larger than the one you uploaded.
Why is my PDF file so large?
The usual culprit is images: high-resolution photos, scanned pages, and screenshots take up far more space than text. Compressing the PDF downsamples and re-encodes those images, which is where the big savings come from.
How do I compress a PDF on Windows, Mac, iPhone, or Android?
The same way on every device. This is a free online PDF compressor that runs in your browser, so there is nothing to download. Open this page on Windows, Mac, Linux, iPhone, or Android, upload your PDF, and download the smaller version.
From the blog
How to Get a PDF Under an Upload Size Limit (100 KB, 500 KB, 2 MB)
Application portals reject files over a fixed size. Here is a practical order of operations for squeezing a PDF under 100 KB, 500 KB, 1 MB, or 2 MB without it becoming unreadable.
How to Compress a PDF File Online (Free, No Software)
Step-by-step guide to compressing a PDF online for free — no software to install, no sign-up, no watermark. Works on Windows, Mac, iPhone, and Android.
How to Compress PDF File Size Without Losing Quality
Worried compression will make your PDF blurry? Learn what actually happens when a PDF is compressed, and how to shrink file size while keeping text sharp and images clean.
How to Compress a PDF for Email
Email bounced your PDF? Learn what actually makes PDFs huge, how compression works, and how to shrink a PDF under 25 MB while keeping it readable.
Your privacy comes first
Every uploaded file is processed securely over an encrypted connection and is never written to disk or stored — it is automatically discarded the moment your download is ready. We never ask for an email address, and you never need to create an account before you can download your document. Read more in our Privacy Policy.
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Last updated: July 2026