Convert · 01 tool, one job
Compress PDF
Shrink PDF files locally without losing readability.
All files are processed locally in your browser. No upload, no server storage, no registration required.
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All files are processed locally in your browser. No upload, no server storage, no registration required.
About this tool
Large PDFs are awkward to email and slow to upload. This tool reduces file size by optimizing the document on your device.
Because compression is local, sensitive PDFs never reach a server. Get a smaller file while keeping text and images clear.
How to use Compress PDF
- 1Open your PDF in the tool — it stays on your device.
- 2The optimizer rewrites the file with compressed object streams.
- 3Compare the before/after size shown in the result.
- 4Download the smaller PDF, or keep the original if it barely changed.
When you might need this
- An email server rejects your PDF as too large.
- You want a lighter attachment for a job or visa application.
- You are archiving documents without a cloud service.
Limitations to keep in mind
- Already-optimized PDFs may show little or no size reduction.
- Compression is structural, not a re-scan, so text stays selectable.
- Encrypted PDFs cannot be processed.
Frequently asked questions
No. All files are processed locally in your browser. No upload, no server storage, no registration required. Your data never leaves your device.