Your screenshot tool is uploading your images
You take a screenshot of a bug. It looks plain, so you drop it into one of the sites that adds a nice gradient and a macOS window frame. Ten seconds later you have something presentable for the issue tracker.
In most cases, that screenshot was just uploaded to a company you have never heard of, and a copy is sitting on their disk.
- 1You paste or drag the screenshot into a web page.
- 2The image is uploaded to that company's server.
- 3The server renders the background and frame.
- 4The finished image is sent back to your browser.
- 5Your original stays on their disk, subject to their retention policy.
- 1The extension captures the tab directly.
- 2A canvas in your browser draws the background and frame.
- 3The result is exported to a file or your clipboard.
No step involves a network request.
The capture is rarely the problem
Screenshots taken with your operating system are local by definition. The exposure appears at the next step — the one where you make it look good. That is the step people reach for a website to do, and it is the step that sends the image away.
It matters because of what tends to be in a screenshot worth beautifying:
- An admin dashboard with real customer names
- A billing page or invoice
- An internal tool showing a staging environment or an API key
- A bug report containing a session token in a URL
- A private Slack or email thread
- A medical, legal or financial record
None of this requires the service to be malicious. A breach, a subpoena, an over-broad retention policy or a misconfigured bucket produces the same outcome. And in most organisations, uploading customer data to an unvetted third party breaches policy regardless of what happens next.
How to check any tool in thirty seconds
You do not have to take anyone's word for it. Open your browser's developer tools, switch to the Network tab, and process an image.
No network activity while the image is processed. The tab stays silent from the moment you drop the file to the moment you download it.
A POST or PUT carrying the image data, usually followed by a download of the rendered result.
For a browser extension there is a second check that is even harder to fake: its permissions. An extension that requests no host permissions for a remote server has no way to send your image anywhere, whatever its description claims. Chrome shows this on the store listing before you install.
A tool with nothing to upload to
PostSnap captures, adds the background and frame, and exports — all on a canvas in your browser. No account, no telemetry, no backend. It is open source, so the absence of network calls is something you can read rather than trust.
Add to Chrome — FreeCommon questions
Do online screenshot editors upload my images?
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Almost all of them do. If a website adds a background, frame or shadow to your screenshot, the image is normally sent to that company's server to be rendered and sent back. Some tools do the work in your browser instead, but the only way to be sure is to check the network requests or use a tool that has no server at all. PostSnap has no server component, so there is nothing for an image to be uploaded to.
Is it safe to use a screenshot beautifier for work screenshots?
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It depends entirely on where the rendering happens. A screenshot of an internal dashboard can contain customer names, invoice amounts, API keys or session tokens in a URL bar. Uploading that to a third party is a data disclosure, and in many organisations it breaches policy regardless of whether the service is trustworthy. Use a tool that processes images locally for anything that is not already public.
How can I tell whether a screenshot tool uploads my image?
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Open your browser's developer tools, switch to the Network tab, and process an image. If you see a POST or PUT request carrying the image data, it is being uploaded. A tool doing the work locally shows no network activity at all during processing. Browser extensions can also be checked by their requested permissions — one that needs no host permissions for a remote server cannot send your image anywhere.
Does PostSnap send anything to a server?
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No. Capture, background rendering, framing and export all happen in the browser using a canvas element. There is no account, no telemetry, no analytics and no backend to receive an image. It is open source, so the absence of network calls can be verified in the code rather than taken on trust.
What about screenshots taken with the operating system?
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Screenshots taken with your operating system's built-in tools are local by definition. The risk appears at the next step: if you then drag that file into a website to add a background or a device frame, it is uploaded at that point. The capture is rarely the problem; the beautifying step usually is.
Is a local screenshot tool slower?
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Usually the opposite. Rendering a background on a canvas takes milliseconds, and a local tool skips the upload and the download entirely. On a large full-page capture over a slow connection, the round trip to a server is the slowest part of the whole operation.