# Is It Safe to Upload a PDF Online? A Privacy Guide > Uploading a document to any web tool means trusting that tool with its contents, so it is worth knowing what actually happens to the file. - Page: https://acepdfmd.com/guides/privacy-guide/ - Updated: 2026-09-14 - Runs at: https://acepdfmd.com (Uploaded files are deleted within 60 minutes. No signup for light use.) - Also in 29 languages: https://acepdfmd.com//guides/privacy-guide/ ## Questions to Ask Any Online Tool Before uploading a sensitive file anywhere, it is reasonable to ask: does the file leave your device at all, how long is it kept if it does, is it used to train any model, and is it shared with a third party. A trustworthy tool should answer all four questions plainly. ## Browser Processing vs Server Processing Not every tool works the same way. Some tools, including [Merge PDF](https://acepdfmd.com/tool/merge/) and [Split PDF](https://acepdfmd.com/tool/split/), run entirely in the browser, so the file is processed on your own device and never uploaded anywhere. Many other tools, including anything that needs OCR or format conversion, process the file on a server, which means the file is uploaded, even briefly. It is worth checking which category a given tool falls into before assuming nothing left your device. If your real concern is feeding a document to an AI assistant rather than general file safety, the [PDF to Markdown guide](https://acepdfmd.com/guides/pdf-to-markdown-guide/) covers how that specific conversion handles content. ## What Happens to Files Here Server-processed files are kept only in temporary storage and are deleted automatically within 60 minutes of processing. Files are never used to train any AI model, and files are never sent to any third-party AI service. Browser-processed tools never upload the file at all, so there is nothing on a server to delete in the first place. ## HTTPS All traffic to and from the site runs over HTTPS, so a file in transit is encrypted and cannot be read by anyone intercepting the connection. ## Metadata as a Privacy Leak A file's visible content is not the whole story. PDFs and images often carry metadata, author names, software versions, edit timestamps, or GPS coordinates on a photo, that a viewer will not notice but that anyone opening the file properties can. [PDF Metadata](https://acepdfmd.com/tool/pdf-metadata/) and [Image Metadata](https://acepdfmd.com/tool/image-metadata/) let you inspect and strip this hidden information before sharing a file publicly. ## Redaction vs Black Boxes Drawing a black rectangle over text in a PDF viewer often just hides the text visually while the original characters remain selectable and copyable underneath, which defeats the purpose entirely. [Redact PDF](https://acepdfmd.com/tool/redact-pdf/) removes the underlying content rather than covering it. For a document with layout elements, like text boxes or fields, that should no longer be editable at all, [Flatten](https://acepdfmd.com/tool/flatten-pdf/) merges everything into a single flat page. ## Passwords [Protect](https://acepdfmd.com/tool/protect/) adds a password requirement to open or edit a PDF, useful before sending a file by email. [Unlock](https://acepdfmd.com/tool/unlock/) removes a password from a file you own or are authorized to access, which is different from bypassing someone else's protection without permission. ## Payments Paid plans are billed through Lemon Squeezy, which acts as merchant of record for the transaction. Card details are handled by Lemon Squeezy directly and never reach this site's own servers. ## When This Is Not the Right Tool For documents under legal hold, classified material, or anything where policy requires an on-premises tool with no network access at all, an online tool of any kind, browser-based or server-based, may not satisfy that requirement, regardless of its deletion policy. Check your organization's data handling rules first. For the full technical and legal detail behind these practices, see [/security](https://acepdfmd.com/security). ## Tools mentioned in this guide - [Merge PDF](https://acepdfmd.com/tool/merge/): Combine multiple PDFs into one document. - [Split PDF](https://acepdfmd.com/tool/split/): Extract page ranges or split into fixed-size chunks. - [Edit PDF Metadata](https://acepdfmd.com/tool/pdf-metadata/): View and change a PDF's title, author, subject & keywords. - [Image Metadata](https://acepdfmd.com/tool/image-metadata/): View and strip EXIF/metadata from images. Remove GPS, camera info, timestamps. - [Redact PDF](https://acepdfmd.com/tool/redact-pdf/): Permanently black out sensitive content. - [Flatten PDF](https://acepdfmd.com/tool/flatten-pdf/): Bake form field values into the page and lock them. - [Protect PDF](https://acepdfmd.com/tool/protect/): Add a password to encrypt your PDF. - [Unlock PDF](https://acepdfmd.com/tool/unlock/): Remove password protection. ## More guides - [Markdown Cheat Sheet: Syntax Reference with Examples](https://acepdfmd.com/guides/markdown-cheat-sheet/) - [PDF Page Sizes and Dimensions: A4, Letter, Legal and More](https://acepdfmd.com/guides/pdf-page-sizes/) - [How PDF Compression Works and Why Some Files Barely Shrink](https://acepdfmd.com/guides/pdf-compression-guide/) - [PDF to Markdown: How It Works and How to Use It for AI](https://acepdfmd.com/guides/pdf-to-markdown-guide/) - [OCR for PDFs and Images: How to Get Accurate Text](https://acepdfmd.com/guides/ocr-guide/) - [Open and Convert iWork Files (Pages, Numbers, Keynote) Without a Mac](https://acepdfmd.com/guides/iwork-guide/) - [JSON Tools Guide: Convert Documents and Data to JSON and Back](https://acepdfmd.com/guides/json-guide/)