Developer Tools
Formatters, validators, and small utilities you reach for mid-project — no package install, no context switch, just paste and go.
JSON Formatter & Validator
Format, validate, and minify JSON instantly — see exact error line numbers, no signup, nothing uploaded.
Base64 Image Converter
Convert an image to Base64, or Base64 back into a downloadable image — automatic format detection, nothing uploaded.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or a file — instantly, in your browser.
HMAC Signature Calculator
Compute or verify an HMAC-SHA256/384/512 signature — for testing webhook signatures against a secret key.
RSA & ECDSA Keypair Generator
Generate an RSA or ECDSA key pair in your browser — standard PEM output, copy or download.
Bcrypt & Argon2 Hasher & Verifier
Hash or verify a password with Bcrypt or Argon2id — the algorithms real backends use for password storage, not a plain hash.
UUID Generator
Generate random UUIDs (v4) instantly — one at a time or in bulk.
JWT Decoder
Decode a JWT's header and payload instantly — every claim readable, expiry checked, nothing uploaded.
Regex Tester
Test a regular expression against text live — every match highlighted in place, capture groups broken out.
Unix Timestamp Converter
Convert a Unix timestamp to a date, or a date to a timestamp — relative time, ISO 8601, and UTC all at once.
JSON ↔ CSV Converter
Convert a JSON array of objects to CSV, or CSV back to JSON — nested objects flatten and un-flatten automatically.
YAML ↔ JSON Converter
Convert YAML to JSON, or JSON back to YAML — comments, nested mappings, and block scalars all handled correctly.
JSONPath Tester
Query JSON with a JSONPath expression and see every match live — resolved path and value, side by side.
JSON Schema Validator
Validate JSON data against a JSON Schema live — every violation listed with its exact path and reason.
HTTP Status Code Lookup
Search every standard HTTP status code by number, name, or keyword — instant, plain-language explanations.
HTML Entity Encoder/Decoder
Encode text to HTML entities, or decode entities back to text — named and numeric references both supported.
JWT Generator
Build and sign a JWT from a JSON payload and secret — HS256, HS384, or HS512, updates live.
CSV Viewer / Inspector
Browse a CSV as a table and see per-column stats — inferred type, empty count, unique count, min/max.
CSV to SQLite Query Engine
Load one or more CSVs into a real in-browser SQLite database and query them with actual SQL, including JOINs across files.
Parquet Viewer
View a Parquet file's schema and data as a browsable table — every compression codec supported.
Cron Expression Generator/Parser
Turn a cron expression into a plain-English description and its next 5 actual run times.
SQL Formatter
Format SQL into a readable, consistently-indented statement — 8 dialects supported.
SQL Minifier
Strip comments and collapse whitespace to shrink a SQL file — string and identifier literals always preserved exactly.
Favicon Generator
Generate a real favicon.ico plus Apple/Android app icons and a manifest.json snippet — from one image.