Compress PDF
Shrink the size of a PDF without changing what it looks like. We rewrite the file structure and drop redundant data so your document is lighter to email, upload or archive.
Files are encrypted at rest, kept in your history for 24 hours on Free (30 days on Pro), then deleted automatically.
How Compress PDF works
- 1
Upload the PDF
Drop the file you want to compress.
- 2
We optimise it
We rewrite the structure and strip unused metadata.
- 3
Download the smaller file
Same visible content, smaller size — often 20–60% less.
Features of the Compress PDF tool
Visually identical
Text stays crisp, images keep their resolution.
Fast
Most files complete in under 3 seconds.
Safe with signed PDFs
Digital signatures stay valid where the tool can preserve them.
No install
Runs in the browser — no plug-ins, no queues.
When to use Compress PDF
Email a large report
Shrink a heavy PDF under the 25 MB attachment limit most inboxes enforce.
Upload to a portal
Fit tax filings, tender submissions or grant forms under strict upload caps.
Speed up your website
Serve smaller PDFs so brochures and specs load fast on mobile connections.
Save cloud storage
Reduce the size of scanned archives before backing them up to Drive or Dropbox.
Why choose Compress PDF
Private by design
Files uploaded to Compress PDF are transferred over HTTPS, encrypted at rest and auto-deleted after 24 hours on Free (30 days on Pro). We never sell or share your documents.
Fast, no install
Compress PDF runs entirely from your browser — nothing to download, no plugin, no account required for a first try. Most jobs finish in a few seconds.
Works everywhere
Use Compress PDF on Windows, macOS, Linux, ChromeOS, iPhone, iPad or Android. Any recent Chrome, Safari, Firefox or Edge browser is enough.
Compress PDF — Frequently asked questions
How much smaller will my PDF be?
It depends on the source. Scanned PDFs shrink most; text-only PDFs least.
Will quality drop?
This tool does lossless structural optimisation only — no image re-encoding by default.
Are password-protected PDFs supported?
Not yet. Unlock the file first, then compress.
Can I compress many PDFs at once?
Currently one file per run. Batch mode is on our roadmap.
Is Compress PDF free to use?
Yes. The Free plan lets you run Compress PDF twice a day on files up to 10 MB, no card required. Pro removes the daily limit and raises the size cap to 50 MB.
Does Compress PDF work on Mac, Windows, iPhone and Android?
Yes. Compress PDF runs in any modern browser, so it works the same on macOS, Windows, Linux, ChromeOS, iOS and Android — no app to install.
What's the maximum file size?
10 MB per file on the Free plan, 50 MB on Pro and 200 MB on Business. Larger files should be compressed first with the Compress PDF tool.