Compress PDF tool
Compress PDF Online Free
PDF compression shrinks your file by re-encoding the images inside it, so the document takes up less space while staying readable. A smaller PDF is easier to email, upload and store. Everything happens right in your browser, and your files are never uploaded to a server.
Drag & drop your PDF here
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Max file size: 100MB | Supports: PDF
Shrink PDF File Size Online for Free
A quick look at what PDF compression does and when it helps.
PDF compression shrinks the file size of a document by re-encoding the images and data inside it. The pages stay readable while the file takes up much less space, which makes it easier to email, upload or store.
People usually compress a PDF when a file is too large to send as an attachment, too slow to upload to a website, or simply filling up too much storage on a device or in the cloud. A compressed version of the same document works everywhere the original did.
Everything here is processed locally in your browser using modern web APIs. Your PDF is never uploaded to a server, so your documents stay on your device the whole time.
How to Compress a PDF
Four simple steps. No account, no upload, no waiting.
Select or drag a PDF
Drop a PDF into the box above, or click browse to choose one from your device.
Let the browser process the file
Compression runs locally in your browser, so there is no upload and no waiting.
Check the resulting file size
The result shows the original and new sizes, so you can see how much space you saved.
Download the compressed PDF
Save the smaller file to your device. Your original PDF is left untouched.
Why use ePDFConverter?
Simple, safe and completely free — built around your privacy.
Free to use
No paywalls, no daily limits and no hidden charges — every tool is free.
Browser-based processing
Compression runs in your browser using modern web APIs, so results appear instantly.
No sign-up
There is no account to create and nothing to install. Just open the page and go.
Files stay on your device
Your PDFs are never uploaded, stored or shared — they never leave your device.
Frequently asked questions
Everything you need to know about compressing PDFs.
How do I compress a PDF?⌄
Select or drag your PDF into the box above, then click Compress & Download. The smaller PDF is downloaded directly to your device.
Is this PDF compressor free?⌄
Yes. It is completely free with no sign-up, no paywall and no limits.
Are my PDF files uploaded?⌄
No. Compression happens in your browser, so your files are never sent to a server.
Will compression reduce PDF quality?⌄
The images inside the PDF are re-encoded to save space while keeping pages readable. Use a lighter level to keep higher quality.
What if my PDF is already optimized?⌄
If the file cannot be made meaningfully smaller, the original is returned as-is so you always get a working PDF.
Compress PDF online, free
Reduce the size of a PDF so it is easier to email, upload or share. Choose a compression level, let the tool optimise the file, then download the smaller PDF. Pages stay readable even when the file size drops a lot.
It is useful for scanned documents, image-heavy reports and forms with strict upload limits. You can aim for a rough size such as 500 KB, 1 MB or 2 MB, and it works without an account, a watermark or any software install.