devtoolgrid.online
Nine sharp browser tools in one grid.
Format payloads, decode tokens, parse URLs, test regex, generate hashes and convert timestamps without leaving the browser.
JSON formatter, validator and beautifier online
Format, minify, validate, sort keys, copy and download JSON payloads. Open 02Base64 decoder and Base64 encoder online
Decode Base64 to text and encode Unicode text with optional URL-safe output. Open 03URL decoder and URL encoder online
Decode URLs, encode values, and inspect URL parts and query params. Open 04JWT decoder: decode a JWT token online
Decode JWT header, payload and useful token metadata in the browser. Open 05Regex tester: test a regular expression online
Test expressions, flags, matches and replacement output live. Open 06Time zone converter, current time in UTC and Unix timestamp converter
Convert between time zones, see the current time in UTC, and convert Unix timestamps, ISO dates and epoch values. Open 07UUID generator and GUID generator online
Generate up to 100 UUIDs and validate existing UUID values. Open 08SHA-256, MD5 and hash generator online
Generate MD5, CRC32, SHA-1, SHA-256, SHA-384 and SHA-512 hashes. Open 09HTML decode and HTML encode online
Encode and decode HTML entities for markup, attributes and text. Open 010HTTP status codes: 400, 403, 404, 500 and the full list
Look up any HTTP status code, what it means, and what usually causes it. Open 011Hex to RGB converter, color picker and HSL converter
Convert between hex, RGB and HSL, check WCAG contrast, and browse shades. OpenGuides & articles
Guides for every tool
Base64
What Is Base64 Encoding, and Why Does Software Still Use It?
Base64 turns binary bytes into portable text. Understanding why it exists makes its odd-looking output, padding, overhead, and limitations much easier to reason about.
8 min read
Hash
What Cryptographic Hashes Prove, and What They Do Not
A hash condenses data into a fixed-size fingerprint. That fingerprint supports integrity checks and signatures, but it is not encryption or proof of trust by itself.
8 min read
HTML
Why HTML Entities Exist
HTML entities let documents represent characters that would otherwise be mistaken for markup, but correct escaping depends on context.
8 min read
JSON
Why JSON Became the Language of Web APIs
JSON won because it made structured data easy to read, generate, and move between unrelated systems. Its success also created conventions developers now take for granted.
8 min read
JWT
How JSON Web Tokens Work Without Hiding Their Contents
JWTs package claims into portable, signed tokens. Their value comes from verifiable integrity, not from keeping the payload secret.
8 min read
Regex
How Regular Expressions Read Text
Regular expressions describe text patterns through literals, classes, repetition, boundaries, and groups. Learning how those parts cooperate makes regex far less mysterious.
8 min read
Time
Unix Time and the Problem of Representing “Now”
Unix timestamps provide a simple shared timeline, but precision, leap seconds, clock quality, and interpretation still require deliberate choices.
8 min read
URL
How URLs Turn Text Into Reliable Web Addresses
A URL is more than a link. Its scheme, authority, path, query, fragment, and encoding rules form a compact instruction for locating and identifying resources.
8 min read
UUID
How UUIDs Create Identifiers Without Central Coordination
UUIDs let independent systems create identifiers with an extremely low collision risk, changing how records can be created, merged, and shared.
8 min read
devtoolgrid.online
DevToolGrid Online developer tools
json formatter online, json validator, json decoder, base64 decoder online
DevToolGrid Online keeps everyday browser utilities in one place: json formatter online, json validator, json decoder, base64 decoder online, base64 encoder, url decoder. Developers can clean JSON payloads, decode Base64 and JWT tokens, inspect URLs, test regular expressions, convert Unix timestamps, generate UUID values, create MD5 or SHA-256 hashes, and encode or decode HTML entities without uploading data.
The tool pages are built for direct access and search intent, covering common tasks like url encoder, jwt decoder, regex tester, unix timestamp converter, uuid generator, guid generator, md5 generator, sha256 generator, html entity decoder.