oMyPDF

Compress PDF

Reduce PDF file size while keeping quality — perfect for email and the web. Free, fast and secure.

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Large PDF files can be a hassle to email, upload, or share. oMyPDF's Compress PDF tool reduces file size in seconds without any desktop software. Files under 15 MB are compressed entirely in your browser, keeping your documents completely private. Choose from four compression levels — from light optimization for printing to extreme shrinking for email — and see the exact size saving before you download. No watermarks, no sign-up, and no daily limits.

How to compress a PDF

  1. 1

    Upload

    Select a PDF from your device or drag and drop it into the workspace.

  2. 2

    Choose a level

    Pick Recommended for a great balance, or go higher for the smallest file. Extreme re-renders pages as images.

  3. 3

    Download

    Click Compress and download your smaller PDF, with the size reduction shown.

Compress PDF features

Four compression levels

From light optimization for printing to extreme shrinking for email — you choose the trade-off.

Smart image recompression

Embedded images are downsampled and re-encoded in your browser to cut size while keeping quality.

Private & instant

Smaller PDFs are compressed right in your browser; larger ones use secure server processing and are deleted right after.

Security & privacy

Your files stay private. PDFs under 15 MB are compressed entirely in your browser — no upload, no server contact. Larger files are sent over an encrypted (HTTPS) connection, processed immediately, and permanently deleted from our servers. We never store, read, or share your documents.

Frequently asked questions

Is the oMyPDF compress tool free?

Yes. Compressing PDFs is 100% free with no watermark on the output and no sign-up required.

Will compression reduce the quality of my PDF?

Less and Recommended keep text crisp and only optimize images. High trades a little image quality for a smaller file. Extreme re-renders each page as an image, which makes text non-selectable but gives the smallest size.

Why didn't my file get much smaller?

PDFs that are mostly text, or already optimized, have little to remove. Image-heavy PDFs (scans, photos) compress the most. If we can't beat the original size, we keep your original file.

Is my file safe?

PDFs under 15 MB are compressed entirely in your browser and never leave your device. Larger files are sent over an encrypted connection, processed immediately, and deleted right after.

What's the largest file I can compress?

There's no hard limit. Files up to 15 MB are handled in your browser; larger documents are routed to our servers automatically.