Free Developer Tools
A directory of free browser-based tools for JSON, Base64, hashes, timestamps, UUIDs, JWTs, text and encoding.
What this directory covers
Beyond JSON, this directory groups the everyday utilities developers often need while debugging APIs and writing docs.
Tools in this directory
Base64 Encode / Decode
Encode text to Base64 or decode Base64 back to Unicode text.
EncodeFreeMD5 Generator
Generate MD5 hashes for text, checksums and quick non-security fingerprints.
HashFreeSHA256 Generator
Create SHA-256 hashes for text with the browser crypto API.
HashFreeTimestamp Converter
Convert Unix timestamps to dates and dates back to Unix time in seconds or milliseconds.
TimeFreeCurrent Unix Timestamp
Get the current Unix timestamp in seconds, milliseconds, local time and UTC.
TimeFreeURL Encode / Decode
Encode text for URLs or decode percent-encoded query strings.
EncodeFreeURL Parser
Parse a URL into protocol, host, path, query parameters, hash and origin.
EncodeFreeQuery String to JSON
Convert URL query strings into JSON objects for debugging links and tracking parameters.
EncodeFreeHTML Entity Encode / Decode
Encode HTML entities or decode escaped HTML text back to readable characters.
EncodeFreeUUID Generator
Generate random UUID v4 identifiers for tests, records and API examples.
RandomFreeJWT Decoder
Decode JWT header and payload without sending tokens to a server.
EncodeFreeRegex Tester
Test regular expressions against text and inspect matches, groups and indexes.
TextFreeAI Regex Generator
Generate a regular expression from a plain-English matching requirement.
AIFreeCase Converter
Convert text into camelCase, PascalCase, snake_case, kebab-case, uppercase and lowercase.
TextFreeSlug Generator
Generate clean URL slugs from titles, headings and article names.
TextFreeWord Counter
Count words, characters, lines and paragraphs in plain text.
TextFreeCron Parser
Explain common 5-field cron expressions in plain English.
TimeFreePassword Generator
Generate strong random passwords with configurable length and simple character options.
RandomFreeRelated guides
Base64 Decode Online
Decode Base64 text back into readable Unicode text without uploading it to a server.
Encode guideGuideMD5 Hash Generator
Generate an MD5 hash from text and understand when MD5 is useful or unsafe.
Hash guideGuideSHA256 Checksum Generator
Generate a SHA-256 checksum from text for stronger fingerprints and integrity checks.
Hash guideGuideUnix Timestamp to Date
Convert Unix seconds or milliseconds into readable local and UTC date strings.
Time guideGuideDate to Unix Timestamp
Convert a readable date into Unix seconds and milliseconds for APIs, databases and logs.
Time guideGuideCurrent Unix Timestamp
View the current Unix timestamp in seconds and milliseconds with UTC and local time.
Time guideGuideJWT Payload Decoder
Decode a JWT payload and header locally so you can inspect token claims.
Encode guideGuideAI Regex Generator
Generate a regular expression from plain English, then test it with real examples.
AI guideGuide