Blackbar — Redact screenshots before you share

Capture, auto-detect secrets, and black them out. Everything happens on your device — this extension cannot make network requests.

Blackbar — Safe screenshots by default. Share screenshots without leaking secrets. Blackbar automatically detects and permanently redacts sensitive information before your screenshot is created. API keys, access tokens, passwords, emails, phone numbers, card numbers, wallet addresses, IP addresses, and other credentials are covered automatically, so the first screenshot you see is already the safe one. Unlike cloud-based screenshot tools, everything happens entirely on your device. Blackbar cannot upload your screenshots or send your data anywhere. Its Content Security Policy declares connect-src 'none', meaning Chrome itself blocks the extension from making network requests. It works even with your internet disconnected. Capture exactly what you need Capture an area, the visible page, the full page, or a single element Paste existing screenshots directly into the editor Fully customizable keyboard shortcuts Automatic on-device detection Blackbar identifies common sensitive information, including: API keys, tokens, and other high-entropy secrets Password fields Email addresses Phone numbers Payment card numbers (checksum verified) IBANs Social Security numbers Cryptocurrency wallet addresses Street addresses Public IP addresses Powerful editing tools Secure black bars Blur and pixelation Arrows, boxes, highlights, and text Crop Undo and redo Copy to clipboard Export as PNG or JPEG Built for real redaction Blur and pixelation are visual effects—not secure redaction. Blackbar makes this clear and indicates when a screenshot is safely redacted using permanent black bars. Every exported image is flattened, removing editable layers and stripping metadata before it leaves your device. Minimal permissions Blackbar only accesses the tab you choose, only after you activate it. It does not request permission to read and change data on every website you visit. Honest limitations Chrome does not allow extensions to capture protected pages such as the Chrome Web Store, Settings, or the New Tab page. For those, simply take a normal system screenshot and paste it into Blackbar. Blackbar also cannot detect text that exists only inside images, videos, or canvas elements. Rather than pretending those areas are safe, it tells you when they cannot be analyzed. Open source and transparent No build step. No dependencies. No minified code. The code in the repository is the code in the extension package. Inspect the manifest, verify the permissions, and see exactly how Blackbar works. Free forever, including automatic detection.