Sprint19 Tools
A Sprint19 project. sprint19.com →Privacy-first, browser-based engineering utilities. Nothing is uploaded. Everything runs locally in your browser. No tracking, no backend, no sign-up.
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Email & DNS
DKIM Record Builder
Paste your public key and selector to generate a DKIM DNS TXT record.
Email AuthDKIM Inspector
Paste a DKIM TXT record or signature header to inspect fields, flags, and key status.
Email AuthDMARC Record Builder
Fill in your DMARC policy settings and get a ready-to-publish TXT record with field explanations.
Email AuthDMARC XML Reader
Upload a DMARC aggregate report and get a clear, structured interpretation of authentication results.
Email AuthSPF Record Builder
Enter your authorized senders and IP ranges to generate a complete SPF TXT record.
Email AuthSPF Analyzer
Paste an SPF record to see mechanism breakdown, lookup count, and configuration warnings.
Email AuthDNS TXT Record Inspector
Paste a DNS TXT record to parse key/value pairs. Works with DMARC, SPF, DKIM, and domain verification records.
Email AuthMessage Header Analyzer
Paste message headers for a structured field breakdown, authentication signals, and transfer hop summary.
Email AuthEML Viewer
Open or paste EML source to inspect headers, body preview, MIME structure, and attachment hints.
EmailIDN Converter
Convert internationalized domain names between Unicode and punycode formats for DNS-safe use.
Email AuthSSL & Certificates
OpenSSL CSR Builder
Enter your domain and organization details to generate an OpenSSL CSR command with optional SAN support.
SSL / TLSLet's Encrypt Command Builder
Select your web server and domain to generate a ready-to-run Certbot command.
SSL / TLSHSTS Builder
Set max-age, includeSubDomains, and preload to generate a Strict-Transport-Security header.
SSL / TLSAuth & Tokens
JWT Decoder
Paste a JWT to decode header, payload, and signature. Decode only, no verification.
Auth & TokensBasic Auth Header Generator
Enter a username and password to generate a Base64-encoded Authorization header.
Auth & TokensOAuth Scope Formatter
Paste an OAuth scope string to get a formatted, readable list of scopes.
Auth & TokensHTTP & Headers
CORS Checker
Paste HTTP response headers to analyze CORS configuration and flag common misconfigurations.
HTTP & APIsHTTP Header Analyzer
Paste HTTP response headers for a structured breakdown of Cache-Control, CSP, CORS, HSTS, and security headers.
HTTP & APIsCSP Policy Parser
Paste a Content-Security-Policy header to break it into a structured directives table.
HTTP & APIsWebhook Viewer
Paste a JSON webhook payload for formatted display, structure stats, and event detection.
HTTP & APIsData & Config
ENV File Formatter
Paste a .env file to get a structured table with optional value masking.
DataRedis URL Parser
Paste a Redis connection URL to extract host, port, database, and auth details.
DataPostgres JSON Formatter
Paste JSON from psql output. Handles escaped formats, pretty-prints, and validates.
DataCalendar File Viewer
Upload or paste ICS calendar content to parse VEVENT entries into a readable event table.
DataDevOps & Logs
Dockerfile Linter
Paste a Dockerfile to flag unpinned base images, missing WORKDIR, and multiple RUN layers.
DevOpsNGINX Config Formatter
Paste an NGINX config block to get pretty-printed, readable output.
DevOpsRails Log Beautifier
Paste Rails server logs to group requests, extract stats, and color-code status results.
LogsPort Check Command Generator
Generate terminal commands for host/port checks with TCP or UDP options. Command snippets only.
DevOpsUtilities
LinkedIn Text Formatter
Format plain text with Unicode styling for copy/paste into LinkedIn posts and comments.
UtilityColor Picker & Palette Generator
Generate complementary, analogous, triadic, and monochrome palettes from any base color with WCAG contrast ratios.
UtilityJavaScript to TypeScript Converter
Paste JavaScript code to get a TypeScript version with basic type annotations and interface scaffolding.
CodeEncode / Decode
Encode and decode text as Base64, URL, or HTML entities with deterministic local conversion.
UtilityPrinciples
- Clear over clever
- Deterministic over speculative
- Minimal infrastructure
- Transparent logic