PDFThings

Compress a PDF Online

Compress a PDF online with no install and no account. Reduce PDF file size without losing quality. Upload up to 20 PDFs per job, process instantly, and download clean output.

Drop a file here, or browse

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Compress a PDF online in your browser — no desktop app, no install, no account. Open the page, drop in your files, and download the result in seconds. Everything runs through an encrypted connection and your files are auto-deleted within 12 hours.

The tool accepts up to 20 PDFs per job, lets you compress them in the order you choose, and produces clean output every time.

Why use this merger

Smaller emails

Get attachments under 25MB so they send instead of bouncing back.

Three quality levels

Choose low, medium, or high compression to match how you'll use the file.

Text stays sharp

Compression targets images and bulk data — text and layout remain readable.

Clean output

No watermark is added to your compressed file.

How to compress a pdf online

  1. 1

    Upload your PDF

    Select the PDF you want to compress and upload it.

  2. 2

    Choose a compression level

    Pick low for the smallest file, medium for balance, or high for near-original quality.

  3. 3

    Compress and download

    Run the compression and download the smaller file, ready to email or upload.

Related ways to merge PDFs

Compress a PDF FreeCompress a PDF Without WatermarkCompress a PDF on WindowsAll Compress PDF features

Frequently Asked Questions

Is compressing PDFs online safe?
Yes. Files are uploaded over an encrypted connection and automatically deleted from our servers within 12 hours.
Do I need to create an account?
No. The tool works without registration — upload, process, and download.
How many files can I compress at once?
You can compress up to 20 PDFs per job in a single job.