About Blur Sensitive Info
Bug reports, support tickets, demo screenshots — they always seem to include something you didn't mean to share. An email address. A real customer name. An API key in a console output. The Blur Sensitive Info tool is a focused redaction page: drop a screenshot, drag rectangles over the bits you want to hide, pick blur, mosaic or solid black per region, export. The blur engine is the same one used by the Screenshot Annotator, but the UI is stripped to the one job, so you spend less time clicking and more time confirming the redaction is complete.
- No uploads
- Browser-only
- Works offline
- 100% free
How it works
- 1
Drop a screenshot
JPG, PNG, or WebP. The image stays in your browser.
- 2
Drag to redact
Click-and-drag any number of rectangles over the regions you want to hide. Pick the redaction style per region — Blur (Gaussian), Mosaic (pixelate), or Solid (black bar).
- 3
Verify, then export
Zoom or pan the preview to confirm nothing's leaking. Export as PNG and the redactions are baked permanently into the pixel data.
Related tools
Browse allAdd arrows, boxes, highlights, blurs and text labels to any screenshot.
Strip camera, GPS and other metadata from photos before sharing.
Wrap any screenshot in a macOS, Windows or terminal window frame.
Crop with aspect-ratio presets — square, 16:9, portrait, freeform.
Frequently asked questions
Are my files uploaded to a server?
No. Every tool on SnapToolz runs entirely inside your browser using JavaScript and WebAssembly. Your file is read locally, processed in memory, and the result is offered as a download. Nothing is sent to a server — there isn't one to send to.
Is blurred text recoverable?
If the blur radius is too low, yes — there are public tools that can partially deblur weak Gaussian blurs. The default radius (16 px) is strong enough for normal-density text; for very small text or high stakes (auth tokens, financial data), use Mosaic with a 24 px+ block size or Solid black bars instead.
What's the difference between blur, mosaic and solid?
Blur smears the pixels — looks the smoothest but the *least secure*. Mosaic chunks the region into solid-colour blocks of `blockSize` px — irreversible if blockSize is large enough. Solid fills the region with black — most secure, but visually obvious.
Can I redact a face?
Yes — drag a rectangle around the face and pick Blur or Mosaic. There's no auto-face-detection (privacy reasons — that would imply running an ML model on every uploaded image).
Will my redaction survive copy/paste / re-screenshotting?
Yes. The exported PNG has the redaction permanently rendered into the pixel data. There's no metadata or layer information that could be unredacted by a downstream tool.
Does it work offline?
Yes. SnapToolz is a Progressive Web App. After your first visit, the app is cached on your device and every tool keeps working without an internet connection.
Is SnapToolz free?
Yes — every tool is 100% free with no sign-up, no watermark, no hidden tier. The whole platform is open source and we have no plan to gate features.