JSON formatter
Paste JSON to check it, pretty-print it, minify it, or explore it as a tree.
JWT decoder
Shows a token's header and claims. The signature is not checked, because that needs the signing key.
Base64 & URL encoding
Type on either side and the other side updates. Text is treated as UTF-8.
Unix timestamp converter
Paste a timestamp in seconds, milliseconds, microseconds or nanoseconds, or a date like 2026-10-24T09:30:00Z.
UUID & ULID generator
v4 is random. v7 and ULID start with the time, so they sort in the order they were made.
Hash generator
SHA hashes of text or a file. MD5 isn't included because browsers don't provide it, and it shouldn't be relied on.
Regex tester
JavaScript regular expressions. Matches are highlighted as you type.
Text diff
Line-by-line comparison. Removed lines are red, added lines green.
Cron explainer
Five fields: minute, hour, day of month, month, day of week. GitHub Actions and most servers read these in UTC.
CIDR / subnet calculator
IPv4. Enter an address with a prefix like 10.0.12.34/20, or with a netmask like 192.168.1.10 255.255.255.0.
Timezone meeting planner
Pick a date and an hour in the first zone to see that moment everywhere else. Shaded hours are 9:00 to 18:00.
HTTP status codes
chmod calculator
Tick permissions or type an octal value like 755 or 4755.