Dev
JWT decoder
Read a JWT header and payload, with human timestamps and an expired flag. The token stays in the tab.
Dev tools
Generate passwords and UUIDs, encode and decode Base64, inspect tokens, generate hashes, convert timestamps, diff text, and convert data formats on your machine. Nothing leaves the tab.
Dev
JSON to CSV converter
Turn an array of objects into a CSV, flattening one level of nested objects.
Dev
YAML to JSON converter
Convert YAML to JSON, or JSON to YAML, in one page. Parsing stays in the browser.
Dev
Text diff checker
Compare two texts with a live line and word diff. Optional ignore-whitespace.
Dev
Hash generator
Calculate SHA-256, SHA-384, SHA-512, and SHA-1 checksums for text or local files.
Dev
Timestamp converter
Convert Unix epoch timestamps in seconds or milliseconds to ISO 8601, UTC, and local time.
Dev
CSV to JSON converter
Convert CSV records to a JSON array of objects with header mapping and type detection.
Dev
Subnet calculator
Calculate IPv4 network address, broadcast, usable range, subnet mask, and host capacity from CIDR.
Dev
CIDR calculator
Calculate IPv4 CIDR blocks, network address, broadcast address, netmask, usable hosts, and wildcard mask.
Dev
Password generator
Generate strong, cryptographically secure random passwords with customizable length and character sets client-side.
Dev
UUID generator
Generate RFC 4122 compliant UUID v4 (random) and UUID v1 (timestamp-based) identifiers with bulk generation and formatting options.
Dev
Base64 encode & decode
Encode and decode Base64 strings and files entirely in your browser. Supports full UTF-8 Unicode, URL-safe Base64, line wrapping, and data URLs.