71 tools· 6 languages· 0 trackers

Built for the people
who build the web.

Free tools for HAR, DNS, HTTP, email auth, CSP and the everyday — running in your browser, not on our servers.

popular base64 jwt-decoder dns-lookup har-viewer regex-tester csp-generator

§01 focus areas

deep coverage, not just widgets

Where sitekits goes deep.

01 HAR waterfall · timings · verdicts 02 tools → 02 DNS records · propagation · rDNS 01 tools → 03 HTTP headers · redirects · status 06 tools → 04 Email SPF · DKIM · DMARC 02 tools → 05 CSP evaluate · build · report 01 tools → 06 Security hashes · certs · JWT 05 tools → 07 SRE cron · uptime · error budgets 02 tools → 08 Privacy local by design 67/71 local

§02 all tools

71 live · grouped by tag · press ⌘K

Every tool, one keystroke away.

format & convert 25

JSON Formatter / Validator local XML Formatter local SQL Formatter local HTML Formatter local CSS Formatter local JavaScript Formatter local JSON ↔ YAML Converter local + 18 more →

encode & decode 09

Base64 Encode / Decode local URL Encode / Decode local Hash Generator local HTML Entity Encoder & Decoder local JavaScript Hex String Escape local XML String Escaper local Number Base Converter local + 2 more →

generate 08

Password Generator local UUID v4 Generator local Content Security Policy Generator local JSON to TypeScript Interface Generator local Crontab Expression Editor local Random JSON Data Generator local Lorem Ipsum Generator local + 1 more →

validate & inspect 24

JSON Formatter / Validator local XML to XSD Schema Generator local Regular Expression Tester local XPath Expression Tester local YAML Validator local HTML Validator local JavaScript Syntax Validator local + 17 more →

network 19

IP Address Checker server DNS Lookup Tool server HTTP Headers Checker server IPv4 Subnet Calculator local IPv6 Subnet Calculator local IPv4 Address Converter local IPv6 Address Compressor local + 12 more →

security & email 09

Hash Generator local Password Generator local Content Security Policy Generator local JWT Token Decoder local HAR File Sanitizer local Email Header Analyzer local EML Email Viewer local + 2 more →

text 09

Markdown Preview local Text Diff Checker local Regular Expression Tester local JSONPath Evaluator local XPath Expression Tester local Code Cleaner local Lorem Ipsum Generator local + 2 more →

time & image 10

Download Time Calculator local Unix Time Converter local Timezone Converter local Crontab Expression Editor local ICS Calendar Viewer local Color Picker — HEX, RGB, HSL local SVG Viewer & Renderer local + 3 more →

Browse all 71 tools 18 tags · 8 focus hubs · 6 languages

§03 privacy model

Designed with privacy in mind.

sitekits is built local-first. Paste anything sensitive — tokens, headers, configs — and it is parsed right here in your browser. Not logged, not stored, not seen.

local: 67; No network requests. Input is processed in your browser and never sent.
server: 3; ip-check · dns-lookup · http-headers — answered by our API, never stored.
external: 1; rest-api-tester calls your target directly. It never touches our servers.