Free PDF Compressor

Upload PDF

Add one PDF, choose compression settings, then download the optimized file.

● Browser-only processing

Choose or drop a PDF file PDF only. Maximum size up to 5GB. Very large files may need a powerful computer.

Compression mode

Basic Optimize keeps the PDF structure safer. Strong Compress can reduce scanned/image PDFs more, but converts pages into images.

Mode

Basic Optimize may reduce some PDFs, but already-optimized PDFs may not shrink much.

Strong compression settings

Use these for scanned PDFs, image-heavy PDFs, or documents where smaller size matters more than selectable text.

Image quality

72%

Page image width

Strong mode removes selectable text, links, forms, and annotations because each page becomes an image.

Compression Summary

Check output size and download the compressed file.

Original Size 0 B

Compressed Size 0 B

Saved 0%

Pages 0

Preparing... 0%

Compressed PDF is ready.

Click the download button to save it to your device.

Important notes

Basic mode is safest but may not shrink every PDF.
Strong mode works best for scanned or image-heavy PDFs.
Password-protected or damaged PDFs may fail to process.
Large PDFs are allowed, but your browser memory can still be the real limit.

Your PDF file stays on your device.

AnoxFlow does not upload, read, store, sell, or send your PDF file to our hosting, any AI service, or any third-party API. The compression process happens locally inside your browser.

Technical transparency: this tool uses the browser File API, pdf-lib, and PDF.js inside your browser. It does not use server upload forms, backend PDF processing, cloud storage, database writes, or tracking scripts for your PDF content. Strong compression rebuilds pages as images, and your PDF is not uploaded to our server.