Tool / document utility

Compress PDF

Try a local, lighter copy and compare the result before downloading.

Files stay in this browser for this workflow. Nothing is sent to our servers here. Clearing or refreshing the tab removes the working copy.

Drop a PDF to lighten

Drop here or choose from your device · one file

A little more context

About Compress PDF

Use Compress PDF when you want to compare a lighter re-saved copy with the original before attaching or uploading it.

What is Compress PDF?

Compress PDF creates a separately downloaded copy using a browser-side structural re-save. It is useful for testing whether a PDF can become lighter without replacing the original file.

When this tool helps

Try to reduce the size of an email attachment.
Prepare a PDF for a service with a smaller upload allowance.
Check whether a PDF’s internal structure can be made more compact without replacing the original.

What happens to your file?

Compression runs in your browser. The PDF is re-saved locally and is not sent to the server for this workflow.

Features in this tool

Show the original and output sizes for comparison.
Keep the original available while the new copy is created.
Run locally in the browser without sending the PDF to the server.

Common problems and solutions

The file did not get smaller: Already optimized PDFs or PDFs dominated by images may not offer savings through a structural re-save.
The result needs checking: Open the downloaded copy and compare important pages, links, forms, and annotations with the original.
The PDF cannot be read: Try a fresh export from the source application; malformed or encrypted files may not load.

How to use Compress PDF

Upload one PDF and compare its starting size.
Choose Make lighter copy and wait for the output size to appear.
Open the downloaded copy and check both its size and its important pages.

Tips and limitations

This workflow re-saves the PDF with optimized object streams where possible; it does not promise image re-encoding or a smaller result.
Already optimized PDFs may not shrink.
Keep the original until you have checked the output.

Frequently asked about Compress PDF

Why did my PDF not become smaller?

A PDF may already be optimized, or its images and structure may not offer further savings through this browser-based re-save.

Can compression change quality?

The tool is primarily a structural re-save, but you should still compare the downloaded copy with the original.

Is the original replaced?

No. The original stays on your device and the tool downloads a separate copy.