Redact secrets from screenshots. Native on Linux.

Capture a region with Ctrl+Shift+2 — or paste a screenshot — and Blackbar finds IPs, hostnames, API keys, JWTs, hashes and connection strings and destroys the pixels: not a blur you can undo, an opaque burn into a fresh bitmap with every scrap of metadata stripped. Runs entirely on your machine. No account, no telemetry, no network calls.

Download AppImage ↳ .deb for Debian / Ubuntu / Kali

Free to try · x86_64 and ARM64 · AppImage runs on any distro · $19 to keep

FIG. 02ON DEVICE

§ 01 BLACKBAR ON LINUX

Seven secrets, boxed in one pass.

Consistent session pseudonyms — the same value becomes the same label ([IP-1], [HOST-1], [AWSKEY-1]) across every screenshot in a report.

Blackbar on Linux detecting eight secrets in a terminal screenshot

FIG. 03THE BURN

§ 02 BEFORE / AFTER

Raw terminal with credentials — Beforelooted creds.txt

Same terminal with reviewed regions burned to labeled black bars — Afterpixels destroyed, metadata stripped

FIG. 04GUARANTEE

§ 03 OFFLINE, VERIFIABLE

Built-in capture: Ctrl+Shift+2 grabs a screen region straight into the editor (via grim, spectacle, gnome-screenshot, flameshot, maim or scrot) — the shot uses a temporary local file that is removed after capture or a handled error.
The AppImage bundles its OCR models and fonts — it opens no sockets and needs no runtime downloads.
Exports overwrite pixels in a fresh opaque bitmap and strip all EXIF/XMP/metadata — the original is unrecoverable.
Blur and pixelate are flagged reversible and never applied to a secret without an explicit confirmation.
Same 27 detectors, redaction engine and session pseudonyms as the macOS app — verified against one shared test corpus.
One offline Ed25519 license activates Linux, macOS and Windows — the same emailed code.

FIG. 05INSTALL

§ 04 TWO WAYS TO RUN

AppImage or .deb.

The AppImage is a single self-contained file — download, mark executable, run. Nothing to install; works on any modern distribution, x86_64 or ARM64.

# AppImage — any distro
chmod +x Blackbar_1.1.0_amd64.AppImage
./Blackbar_1.1.0_amd64.AppImage

# Debian / Ubuntu 22.04+
sudo apt install ./Blackbar_1.1.0_amd64.deb

# ARM64
chmod +x Blackbar_1.1.0_aarch64.AppImage
sudo apt install ./Blackbar_1.1.0_arm64.deb

Download AppImage Download .deb ↳ also on macOS and Windows

FIG. 5BVERIFY

§ 4B CHECK WHAT YOU DOWNLOADED

Every release ships a SHA-256 manifest and a GPG signature. Confirm your download is intact and really came from us.

# fetch the manifest, signature and key
curl -O https://dl.getblackbar.com/SHASUMS256.txt
curl -O https://dl.getblackbar.com/SHASUMS256.txt.asc
curl -O https://dl.getblackbar.com/blackbar-signing-key.asc

# check the hash, then the signature
shasum -a 256 -c SHASUMS256.txt
gpg --import blackbar-signing-key.asc
gpg --verify SHASUMS256.txt.asc SHASUMS256.txt

Signing key fingerprint 7ABA D5C3 DC9D A715 8635 459C EDAA EF2F C716 4A46 · full details on the Security & Privacy page.