ShellCheck Online — Run in Your Browser
Run a ShellCheck-style review of your shell script online — no Haskell runtime, no package install. Bash Checker covers the same class of issues ShellCheck flags, plus security, portability, and best-practice checks.
ShellCheck in the browser
Paste any Bash or sh script and get a categorized report with line numbers, severity, and a fix suggestion for each finding. Covers the most common ShellCheck rule families (SC2xxx quoting/variable issues, SC1xxx parser issues, SC3xxx portability).
Beyond ShellCheck
In addition to ShellCheck-style warnings, Bash Checker flags destructive commands, unsafe network downloads, missing input validation, hardcoded secrets, and brittle deployment patterns — issues ShellCheck does not check for.
When to use online vs local ShellCheck
Use the online version for quick reviews, reading scripts shared in chats or issues, or auditing snippets without a dev environment. Use local ShellCheck (via brew, apt, or cabal) when integrating into pre-commit hooks or CI.
Frequently asked questions
- Is this the official ShellCheck?
- No — this is an independent online bash analyzer that flags the same class of issues ShellCheck reports, plus security and quality checks ShellCheck does not perform.
- Do I need to install anything?
- No installation required. Open the page, paste the script, click Analyze.
- Does it support sh and POSIX scripts?
- Yes. The portability section explicitly flags Bash-only features when run against scripts targeting /bin/sh.