Utilitly's Compress PDF tool reduces the file size of a PDF so it's easier to email, upload, or store. Your file is handed to a professional compression engine over an encrypted connection, optimized, and sent straight back to you — it's used for compression only, and never stored, retained, or reused afterward.
Compression works by streamlining how the PDF stores its content. Depending on the document, you can often cut a file by 30–70% with little or no visible change — especially PDFs that are heavy with high-resolution images or bloated metadata.
Your PDF is transmitted over an encrypted connection, compressed, and returned — nothing is kept on our side once the job finishes, and the file you download is clean, with no Utilitly branding or watermark. Confidential material — contracts, financial statements, scanned IDs — is processed for one purpose only and then discarded.
Utilitly gives you two modes. Smart structural optimization rebuilds the file's internal structure for a lighter document while preserving visual quality — the right choice when the PDF still needs to look perfect. Aggressive metadata removal strips hidden data and non-essential elements for the smallest possible file — ideal when you just need to get under an upload or email limit. Preview the result before you download, so you're always in control of the quality-versus-size trade-off.
It depends on what's inside. Image-heavy PDFs (scans, brochures, portfolios) compress the most — often well over half. Text-only documents are already efficient, so they shrink less. Utilitly shows you the before-and-after size in the preview, so you can decide whether the reduction is enough or whether to switch to a more aggressive setting.
Yes — your file never actually goes online. Compression runs entirely in your browser with WebAssembly, so the PDF is never uploaded, transmitted, or stored on a server. It's safe for confidential documents.
Yes. Use the smart structural optimization mode — it reduces file size by streamlining the document's internal structure while preserving the visual quality of text and images. Preview the result before downloading to confirm it looks right.
That's exactly how Utilitly works. There is no upload — your file is read, compressed, and saved locally on your device, with nothing sent to the cloud.
Use the aggressive metadata-removal mode and preview the resulting size. For a step-by-step walkthrough of hitting a specific target, see our compress PDF to 100 KB guide.
It varies by content. Image-heavy PDFs often drop by 50–70%; text-only files shrink less because they're already compact. The preview shows your exact before-and-after size.
No. Your compressed file comes out clean, with no Utilitly watermark or branding.
Utilitly works in any browser on macOS with no extra software. See our reduce PDF size on Mac guide for Mac-specific tips.
There's no artificial limit. Because compression happens locally, large files aren't throttled by your connection — the practical ceiling is your device's available memory.