Look for words like upload, server processing, cloud processing, file deletion, retention, or download link.
- Says "in your browser" On-device or no-upload wording means the file is processed locally, like Compress PDF .
- Uploads to a server A progress bar to a server or a wait queue usually means your file was sent away.
- Not sure Default to a no-upload tool whenever the PDF is private.
| Tool | Best when | Skip when | Privacy fit |
|---|---|---|---|
| Just Compress | Quick private file jobs. | AI reading or deep editing. | No upload. Free. PDF outputs include a small app logo watermark. |
| Cloud PDF and media tools | Non-sensitive files, collaboration, heavy server processing, shared workflows. | Sensitive files that only need a simple mechanical file operation. | Often secure, but many require upload, server processing, and deletion policies. |
| ChatGPT / AI | Summarizing, reasoning, rewriting, comparing, extracting meaning from content. | Only making a file smaller, converting it, or adding a simple mark. | Useful when content analysis is needed; unnecessary exposure for simple file tasks. |
| Adobe / full editors | OCR, redaction, forms, certificates, advanced page editing, professional workflows. | One quick compression or conversion where no full editor is needed. | Powerful, but heavier than needed for simple no-upload file work. |