●Runs in your browser · No sign-up · Nothing uploaded
JSON, JWT, hashing, regex, timestamps, format conversion, images and colors — paste and go, with nothing left behind when you close the tab. 118 of the 122 tools run entirely in your browser; only 4 of them (DNS, IP, response headers and TLS certificates) go through a server proxy, because those simply cannot be done from a page.
01—Browse by category
Categories follow how people actually search, not how the code is organised. Open one to see every tool it contains.
Formatters & Validators
Turn messy or minified structured text into something readable, and pinpoint syntax errors.
15 live / 15 planned
Converters
Convert both ways between two data formats, or between type definitions in two languages.
21 live / 21 planned
Encoding & Crypto
Base64, URL and hex encoding, plus hashing, symmetric and asymmetric encryption, and token inspection.
21 live / 21 planned
Generators
Generate IDs, passwords, fake data, QR codes and common project config files.
15 live / 15 planned
Text & Diff
Compare text, debug regular expressions, switch naming conventions and clean up content in bulk.
13 live / 13 planned
Date & Number
Convert timestamps and time zones, read cron expressions, and change number bases and units.
9 live / 9 planned
Network & Web
Parse URLs and request headers, look up status codes and MIME types, plan subnets and write site config.
15 live / 15 planned
Image & Color
Compress and convert images, convert between color spaces, check contrast ratios and generate CSS visuals.
13 live / 13 planned
02—Most used
Ranked by a weighted score across demand, feasibility, privacy value, competition and internal reuse. The model and the raw data are both in the repository.
Compute SHA-1/256/384/512 and MD5 digests
Inspect JWT header and payload claims and check expiry
Generate strong random passwords with a configurable character set
Convert JSON to YAML while preserving the nesting
Convert YAML to JSON, multi-document files included
Encode and decode Base64, with UTF-8 and URL-safe support
Convert files to Base64 and data URIs — nothing is uploaded
Compute MD5 online and get the 32-character digest
Generate UUID v4 or v7 in bulk, with optional hyphen removal
03—Design principles
Almost every tool uses nothing but native browser capabilities: Web Crypto for hashing, Canvas for image processing, DOMParser for XML. The handful of network tools that genuinely require a connection are labelled "via server proxy" right on the page, not glossed over.
Someone searching for "JSON formatter" wants to paste something immediately, not read a tutorial first. Every tool page puts the workspace above the fold with a fullscreen side-by-side view; the explanation, code samples and troubleshooting notes sit underneath.
Not just an input box: each page has a short definition, step-by-step instructions, equivalent JavaScript / Python / Shell code, the causes and fixes for common errors, and answers to the questions people actually ask.
Before you paste anything sensitive
Open your browser's network panel, then paste and process something on any tool page. Apart from the page's own static assets, you will not see a single request carrying your input.