A growing set of small, privacy-conscious developer utilities. Most run entirely in your browser.
Spot missing, extra or changed keys between two env files, all inside your browser.
Break a CIDR into its network, broadcast, range, masks, and a coloured binary view.
Paste two blocks of text or two spreadsheets and see exactly what changed at line, word and cell level, all in your browser.
Test a semver range against a list of versions and see which match, plus the comparator group that matched each one.
Paste a docker run command and get a docker-compose service snippet, with warnings for anything that doesn't translate cleanly.
Decode a JSON Web Token's header and payload in your browser. It doesn't verify signatures or make any network calls.
Convert between Unix timestamps and human-readable dates. Auto-detects seconds vs milliseconds.
Convert in either direction: a Unix epoch (seconds or milliseconds) to a datetime, or a date and time back to an epoch.
Compute SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text, shown as hex and base64.
Generate v4 (random) or v5 (name-based) UUIDs, the same format as Microsoft GUIDs, with toggles for case, braces and hyphens.
Parse and describe cron expressions in plain English. Supports standard (5-field) and Quartz / Azure Functions (6-field with seconds).
Break a string down by Unicode codepoint, UTF-8 bytes, UTF-16 units and HTML entity to find invisible characters and encoding glitches.
Turn a line-separated list into SQL, JSON, JS, Python, CSV, YAML, Markdown, HTML and more, with quoting and escaping handled.
Convert between octal (755) and symbolic (rwxr-xr-x) Unix file permissions. Click the matrix or paste a value.
Parse a robots.txt, surface syntax issues, and test whether a path is allowed or blocked for a given user-agent.
Build a Content-Security-Policy one directive at a time, with keywords quoted for you and risky combinations flagged. Outputs a header and a meta tag.