How to Redact Sensitive Information from Screenshots
You took a screenshot to demonstrate a bug or share a workflow, and now there is sensitive information you need to hide. Here is how to redact it in your browser without uploading the screenshot anywhere.
Screenshots leak information you did not intend to share. Bank balance in the corner of a software demo, a customer name in a Slack message you wanted to forward, your own face in a Zoom window you forgot to crop. The fix takes thirty seconds.
The browser-only method
OmegaPix's Image Redactor gives you three redaction modes:
- Black bar: a solid rectangle covers the region. Permanent, opaque, unrecoverable.
- Blur: Gaussian blur applied to the region. Hides text without dramatically changing the visual composition.
- Brush: paint over arbitrary shapes. Best for faces, complex backgrounds, or non-rectangular regions.
Pick the mode, drag (or click-and-drag for brush) over the sensitive region, repeat for each region, and download. The redacted image is a new file with the redactions baked into the pixels.
Which mode for what
| Region | Best mode |
|---|---|
| Email address, phone number, account ID | Black bar |
| A face in a casual photo | Blur or brush |
| A signature on a document | Black bar (signatures are recognizable through blur) |
| A whole conversation thread | Black bar over each message turn |
| A passport / ID number | Black bar (blur is reversible for short numeric strings) |
| A licence plate | Black bar |
| Body text in a long screenshot | Blur (preserves the visual rhythm of the page) |
The blur warning
Blur is not safe for short strings. A 4-digit PIN, a credit-card last-four, a short account number, these can be recovered from a blurred image with surprisingly little effort. The pixel patterns of digits are distinctive enough that AI deblurring or even manual analysis can guess the original.
Use black bar (or brush filled with solid colour) for anything that needs to be unrecoverable. Use blur only for long text where readability is what you want to remove, not raw character recovery.
What about the file's metadata
Redacting the pixels does not redact the file's metadata. EXIF on a phone screenshot includes the device model, screenshot timestamp, sometimes the app that took the screenshot. Run the redacted image through the EXIF Remover before sharing.
Multi-level undo
The Redactor has a 10-step undo stack. If you paint over the wrong region, hit Undo. The stack is per-session: once you close the tab, history is gone (which is fine, because the redacted image is already downloaded by then).
Verify the redaction worked
After downloading, open the redacted image in any viewer (Preview, Photos, etc.) and zoom in to where the sensitive content was. Black-bar regions should be solid black, no anti-aliasing artifacts revealing edges. Blur regions should be smooth, no recognizable letterforms. If something is recoverable, the tool kept a layer instead of baking, which can happen if you forgot to click "Apply" on a redaction. Re-redact and re-export.
A note on permanence
The redacted file is a new image. The original screenshot is still on your disk in ~/Downloads or ~/Pictures. If you share the redacted version, delete the original (or move it somewhere intentional) so a stale unredacted copy does not surface later.
That is the whole workflow. Open Image Redactor, drag over the secrets, download. No upload, no service to trust.
Try Image Redactor, free in your browser
No uploads, no account. Your images never leave your device.
Open Image Redactor