Tools — 100% in your browser, no upload, no login
Free browser-based tools
Every tool on this page runs entirely in your browser. Your data is never uploaded to a server, you never create an account, and there is nothing to install. Open a tool, paste your input, and the result is computed locally.
Developer
Format, decode and inspect the small things that trip up every developer.
Base64 Encode Decode – Free, In-Browser
Developer
Encode and decode Base64 for text and files, with URL-safe output and correct UTF-8 handling.
JSON Formatter & Validator – Free, In-Browser
Developer
Format, validate and minify JSON in your browser, with exact error locations.
JWT Decoder – Free, In-Browser
Developer
Decode JWT header and payload locally, read exp and iat as human dates. Signature not verified.
Regex Tester – Free, In-Browser
Developer
Test regular expressions live with match highlighting, capture groups and replace preview.
Unix Timestamp Converter – Free, In-Browser
Developer
Convert Unix seconds or milliseconds to readable dates in any timezone, and back again.
Generators
UUIDs, hashes and QR codes generated locally in a click.
Hash Generator – SHA, MD5, CRC32
Generators
Hash text or files with SHA-1, SHA-256/384/512, MD5 and CRC32 — all computed locally.
QR Code Generator – Free, No Upload
Generators
Generate QR codes locally with adjustable error correction, size and colors, exported as PNG.
UUID Generator – v4 & v7
Generators
Generate UUID v4 and v7 in bulk with uppercase and no-dash options.
Text & conversion
Count words, switch naming conventions and convert Markdown both ways.
Case Converter – camelCase to kebab-case
Text & conversion
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and more.
Markdown to HTML Converter (and Back)
Text & conversion
Convert Markdown to HTML and HTML back to Markdown with a live preview.
Word Counter – CJK-Aware
Text & conversion
Count words, characters, sentences and paragraphs with reading time, and CJK-friendly counting.
Design & color
Check contrast against WCAG and pick accessible color pairs.
Tools in real workflows
Build an API Integration Without the Guesswork
Tools involved: 6
Validate, decode and test your way through an unfamiliar API contract before you write a line of glue code.
Build a Resume That Passes the 6-Second Scan
Tools involved: 4
Draft achievement-led bullets, trim the fluff, verify grammar and export a clean PDF from Markdown.
SEO Pre-Launch Checklist
Tools involved: 4
A repeatable technical pass before you publish — indexing, performance and keyword sanity in one run.
Make a Short Video for Social
Tools involved: 5
Script, capture, caption and compress a 30–60 second vertical video without a dedicated editor.
Ship a Design Handoff That Developers Trust
Tools involved: 4
Verify contrast, lock down a palette, and export clean specs so nothing is lost between design and code.
Write a Newsletter People Actually Read
Tools involved: 7
From a blank outline to a finished, formatted issue — using built-in drafting tools and trusted writing apps.