Text & developer utilities
Text & Developer Tools
The small utilities you reach for a dozen times a day — formatters, encoders, generators and validators — with the guarantee that tokens and snippets stay in your browser.
Developer utility sites are convenient right up until you paste a production JWT, an API response or a password into one and realise it went to someone else’s backend. Every tool in this hub runs client-side, so the token you decode, the text you hash and the JSON you format are processed in the page and never sent anywhere. That makes it safe to use with real secrets, not just throwaway examples.
The collection covers the common jobs: formatting and validating (JSON, SQL, Markdown), inspecting and decoding (JWT, Base64 URL, Unix timestamps), generating (UUIDs, strong passwords, QR codes, hashes) and comparing or measuring (text diff, word count, case conversion). Each is a focused, single-purpose tool rather than a bloated all-in-one editor.
What you can do here
-
Inspect and debug
Decode a JWT to read its claims, pretty-print a JSON API response, or convert a Unix timestamp — without any of it leaving the tab.
-
Generate what you need
Spin up a UUID, a strong password, a QR code or a hash on demand, all computed locally in the browser.
-
Clean up text and code
Format or minify JSON and SQL, test a regular expression against sample input, diff two versions, or convert text case before pasting it back.
Text & Developer Tools in this hub
15 tools — each opens instantly and processes files on your device. Every tool has an in-depth guide.
-
Regex Tester
Test JavaScript regular expressions against inputs in real-time with highlights.
-
UUID Generator
Generate bulk cryptographically secure v4 and v1 UUID strings instantly.
-
Unix Time Converter
Convert Epoch timestamps to human-readable datetime formats and vice versa.
-
JWT Decoder
Decode JSON Web Token payloads offline with signature claims analysis.
-
Word & Character Counter
Live-updates word, character, and paragraph counts plus a reading-time estimate.
-
Code Diff Checker
Compare two text or code snippets side-by-side with inline differences highlighted.
-
Markdown Live Preview
Write Markdown text and view the rendered HTML live on a split screen.
-
URL / Base64 Converter
Encode/decode URLs or convert text and images to Base64 strings.
-
JSON Formatter / Validator
Format, validate, beautify, and minify raw JSON string data dynamically.
-
QR Code Generator
Generate high-quality custom QR Codes for any URL, text, or phone number instantly.
-
Hash Generator
Compute MD5, SHA-1, SHA-256, and SHA-512 cryptographic hashes locally.
-
SQL Formatter
Beautify SQL queries for Standard SQL, MySQL, PostgreSQL, and SQL Server.
-
Code Minifier & Beautifier
Minify or beautify HTML, CSS, and JavaScript code directly in your browser.
-
Password & Secret Generator
Generate strong passwords, hex tokens, and Base64URL tokens using your browser's secure random generator.
-
Case Converter
Convert text between UPPERCASE, camelCase, snake_case, and more, with word and character counts.
Frequently asked questions
Are the values I paste sent to a server?
No. Every developer tool here runs in the browser, so JWTs, passwords, JSON and any other text you paste are processed locally and are never uploaded.
Is it safe to decode a real JWT or hash a real secret?
Yes. Because decoding and hashing happen entirely on your device, no token or secret is transmitted — though you should still treat any secret pasted into a shared computer with normal caution.
Do the generators produce values I can use in production?
The UUID, password and hash generators use the browser’s built-in cryptographic and randomness APIs where appropriate, so their output is suitable for real use.