Hash Generator
Featured
Generate SHA-256, SHA-384, and SHA-512 hashes.
- On your device
- No signup
Developer topic guide
Security tools
Hash, checksum, and regex utilities for developers — free browser-based security helpers.
3 free tools in this guide — pick one below to get started.
Tools in this guide(3)
Open a tool to calculate, convert, or edit — no signup required.
Overview
Security tools generate digests and test patterns without installing CLI utilities. Hash Generator supports common algorithms for integrity checks. File Checksum validates downloads. Regex Tester experiments with JavaScript-flavored patterns.
Hashes verify integrity, not authenticity — pair with signed releases from trusted sources. Regex Tester uses JS semantics; PCRE differences may matter in other runtimes.
Do not hash passwords for storage without proper salt and dedicated password hashing algorithms in your application code.
How to choose
- String digest → Hash Generator.
- File integrity → File Checksum.
- Pattern experiments → Regex Tester.
Frequently asked questions
Which hash for file integrity?
SHA-256 is a common choice. Match the algorithm your download page documents.
Are files uploaded for checksum?
File Checksum reads locally in the browser.
Does regex match server languages?
Patterns use JavaScript RegExp rules unless noted otherwise.
Step-by-step workflows (10)
Multi-step guides that chain tools from this topic—follow numbered steps instead of guessing tool order.
- Debug a JWT or API tokenDecode a bearer token, pretty-print JSON claims, and inspect Base64 segments.3 steps
- Provision staging credentialsGenerate passwords, UUIDs, and hashes for dev, QA, and fixture data.3 steps
- Debug a failing APIReproduce the request, format the JSON response, inspect JWTs, and compare payloads.5 steps
- Validate JSON before deployValidate syntax, pretty-print, generate a schema draft, and diff against the previous payload.4 steps
- Ship a CSS UI tweakPrototype in the playground, generate layout and effect CSS, then check contrast.6 steps
- Turn a spreadsheet into an API payloadPreview CSV, convert to JSON, format, and validate before posting to an API.4 steps
- Verify a download with checksumsHash the file you downloaded, compare digests, and encode strings when docs ship Base64.3 steps
- Pre-launch domain and TLS checkConfirm DNS, WHOIS, SSL certificates, and security headers before go-live.4 steps
- Write and test a regexTest patterns live, consult cheat-sheet examples, and diff sample outputs.3 steps
- Backend ops cheat sheetBuild cron schedules, explain expressions, convert timestamps, and tidy env files.4 steps