Link Checker
Scan all links on the current page and find broken ones. Reports HTTP status codes, flags 4xx and 5xx errors and redirects, and lets you filter down to just the problems.
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Leather
Leather is 100% open-source and audited by top security firms. Be part of our community on X
CodeKitHub Quick Tools
12 free offline developer tools in one popup: JSON formatter, Base64, URL encoder, timestamp, UUID, hash generator, regex tester, color converter & more. 100% local, no data collection.
Ultimate QR Code
Generate a QR code from any text or the current page, with selectable error-correction levels and PNG download. Right-click selected text or the page to make a QR, or right-click an image to read one.
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Project Structure Builder
Generate project folder structures and directory trees from text to downloadable ZIP files instantly. Best offline developer tool.
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Timestamp Studio
Read, build and convert Unix timestamps with a live epoch clock, seconds/milliseconds detection, ISO format, relative time and time-zone display. Works offline.
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Escape Tool
Escape and unescape text in six formats: JSON string, backslash, HTML entities, URL encoding, shell single-quote and regex. Switch direction with one click.
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Site Themer
Write your own CSS for any site and see it applied the moment you save.
ArchivioMD Verifier
Automatically detects and cryptographically verifies content integrity on sites using the ArchivioMD WordPress plugin confirming hashes, signatures, and timestamps.
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Calcis: LLM Cost Estimator
See what your LLM prompt will cost before you send it. Works on ChatGPT, Claude, and Gemini.
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IP Detail
Break down any IPv4 address into its integer, hexadecimal and binary forms, show the address class and scope, and build the in-addr.arpa reverse pointer. Accepts dotted, decimal or hex input. Runs locally.
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Epoch & Duration
A timestamp and duration helper: humanize durations, break them into weeks, days, hours, minutes and seconds, and translate Unix epochs to readable dates and back. Runs locally.
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