FlashFile

Enhance PDF

Compress PDF

Shrink PDF file size by re-encoding photos and optimising the file structure — text stays sharp and selectable.

Runs entirely in your browser — the file never leaves this device

✅

100% FREE

No subscription required

🔒

COMPLETELY PRIVATE

Your files are never uploaded anywhere

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CLIENT-SIDE PROCESSING

All conversions happen in your browser only

🛡️

YOUR DATA IS YOURS

We process everything locally on your device

Drop your file here

or click to choose from your device

Select file

About Compress PDF

Reduce PDF size for email attachments and upload limits. Photos inside the PDF are re-encoded, the file structure is optimised, and the text stays sharp and selectable.

How to use Compress PDF

  1. 1Click "Select file" or drag and drop a large PDF into the box above.
  2. 2Set the quality / compression level.
  3. 3Press "Run Compress PDF". The conversion runs on your own device, usually in a few seconds.
  4. 4Download a smaller PDF. Nothing is uploaded or stored on any server.

Tips for the best result

  • 'Balanced' suits most files; 'Strong' gives the smallest result for photo-heavy PDFs.
  • PDFs that are already optimised may shrink only a little.

Frequently asked questions

Will the text stay selectable?

Yes with Light and Balanced. 'Strong' may flatten very large scanned pages to images when that is the only way to shrink them.

Is the Compress PDF tool free?

Yes. It is completely free, with no sign-up, no watermark and no daily limit.

Are my files uploaded to a server?

No. FlashFile processes your files entirely inside your browser, so they never leave your device.

Is there a file size limit?

There is no fixed limit. Files up to about 200 MB work on most computers; very large files depend on your device memory.

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