Developer tools
Encoders, decoders, formatters for code and queries, and web, network and time utilities. Runs locally, so tokens and keys stay private.
No uploads · no accounts · no tracking
Encode & decode
Base64 Encode / Decode
Convert text or files to and from Base64 — locally, no upload.
URL / HTML Entity Encode
Percent-encode URLs & escape HTML entities — locally, no upload.
JSON Escape / Unescape
Text to JSON string literal and back, \uXXXX option — locally, no upload.
Decode Anything
Auto-detects and peels nested Base64, URL, hex, HTML & gzip layers.
JWT Decoder & Verifier
Decode, verify & sign JSON Web Tokens, generate JWKs — locally.
Text Compression
Gzip, deflate or LZ-string text to Base64 & back — no upload.
Code & queries
JSON to Types
Generate TypeScript, Go, Rust & Python types from JSON — locally, no upload.
cURL to Code
Convert a curl command to Python, fetch, Go & more — locally, no upload.
SQL Formatter
Beautify & minify SQL — MySQL, Postgres, SQLite & more — locally, no upload.
SQLite Playground
Run real SQL on your CSV & JSON with SQLite — locally, no upload.
jq Playground
Run real jq filters over JSON, live — locally, no upload.
Regex Tester
Test regular expressions with live match highlighting — no upload.
Web & network
CSP Builder
Build & audit a Content-Security-Policy, export for any server.
Subnet Calculator
CIDR, netmask & host ranges for IPv4 and IPv6, plus a subnet splitter.
Cron Parser
Crontab schedules in plain English + next run times — locally, no upload.
Color & Contrast
WCAG contrast checker + HEX/RGB/HSL/OKLCH converter — no upload.
CSS Gradient Generator
Linear, radial & conic gradients with draggable stops & OKLCH.
Hashes, IDs & time
Hash Generator
MD5, SHA-1, SHA-256 & SHA-512 of text or files — locally, no upload.
Checksum Verifier
Check a download against its SHA-256 or SHA256SUMS — any file size, no upload.
UUID Generator
Random v4 UUIDs, single or in bulk — locally, no upload.
Timestamp Converter
Unix epoch to date and back, any time zone — locally, no upload.
.NET Ticks Converter
C# DateTime.Ticks to date and back, exact BigInt math — no upload.