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47 tools in 5 categorieies match your search.
Data utilities
Fast helpers for working with JSON, timestamps, CSV, and other structured payloads.
Base64 Encode & Decode
Convert between plain text and Base64 with URL-safe mode, padding helpers, and wrap presets.
Checksum Comparison Utility
Compare two checksum values with normalization toggles, mismatch diagnostics, and algorithm hints.
Code Beautifier / Minifier
Format or minify HTML, CSS, JavaScript, and SQL with server-side helpers and copy-ready outputs.
Convert from Seconds
Turn raw seconds into calendar-aligned breakdowns with copy-ready conversions.
Convert to Seconds
Enter calendar fields and receive normalized seconds for TTLs, schedules, and retention windows.
Cron Expression Tester
Explain cron syntax, preview the next run windows, and share copy-ready scheduler snippets with timezone context.
CSS Purge Estimator
Spot unused selectors against your markup, build safelists, and copy purge-ready tokens.
CSV ↔ JSON Converter
Normalize CSV exports and JSON arrays with delimiter controls, header detection, and row stats.
Datetime → Timestamp
Turn calendar dates and times into Unix seconds with ISO outputs across timezones.
Hash Algorithm Explorer
Compare digests across hashing algorithms with grouped presets and checksum diff helpers.
JSON Formatter & Validator
Pretty print, minify, and lint JSON payloads with server-side validation and copy-ready outputs.
JWT Decoder & Verifier
Decode JWT headers and claims, verify HMAC signatures, and inspect expiration windows.
Timestamp → Datetime
Convert Unix seconds into ISO 8601 strings, UTC formats, and timezone-friendly highlights.
UUID Batch Generator
Generate UUIDs in bulk with checksum helpers to verify batch delivery.
XML Sitemap Generator
Assemble sitemap.xml files with changefreq presets, priority controls, and instant XML preview.
YAML ↔ JSON Converter
Flip between YAML configs and JSON payloads with indentation controls and structure stats.
SEO utilities
Webmaster tooling for metadata, previews, directives, and indexability checks.
Accessibility Contrast Checker
Check WCAG contrast ratios, review APCA guidance, and preview text, links, and buttons before launch.
HTTP Cache Planner
Build Cache-Control policies or explain pasted header values with TTL math, companion header guidance, and practical caching notes.
Meta Preview Suite
Preview SERP, Open Graph, Twitter/X, and LinkedIn metadata cards with launch checks.
Meta Tag Generator
Generate title, description, canonical, Open Graph, Twitter, and robots tags from one server-side form.
Redirect Checker
Inspect redirect chains hop by hop, confirm final destinations, and catch hostname or HTTPS drift before launch.
Redirect Diff
Compare two redirect chains hop by hop and catch final destination or host drift before launch.
Robots.txt Diff
Compare two robots.txt snapshots and import live robots.txt into either side when you need a quicker way to fill the inputs.
Robots.txt Generator
Build robots.txt rules, sitemap directives, host lines, and AI bot blocks from one server-side form.
Schema Markup Generator
Generate copy-ready JSON-LD for common page, article, and product schema types.
Structured Data Validator
Validate JSON-LD schema markup, normalize pasted script tags, and surface repair hints before launch.
Networking & security
Inspect DNS, certificates, headers, and domain-level signals from one diagnostics cluster.
DNS Lookup
Look up core DNS records for a public domain, inspect grouped answers, and confirm key hostname routing signals.
HTTP Header Analyzer
Inspect final response headers, review security coverage first, and verify cache, compression, and robots signals for any public URL.
Punycode Toolkit
Convert internationalized hostnames to ASCII punycode or decode punycoded labels back to Unicode.
Raw Punycode Encode / Decode Utility
Encode bare text as raw punycode or decode raw punycode lines back to Unicode without hostname rules or xn-- prefixes.
SSL Certificate Inspector
Inspect the leaf TLS certificate for a public hostname, review SAN coverage, and catch expiry or issuer issues before they surprise you.
WHOIS Lookup
Look up WHOIS registration data for a public domain, review the key registration fields, and inspect the raw registry text.
Content utilities
Writer-friendly text helpers shipping alongside each tool launch.
Case Converter
Convert text into camel, snake, kebab, and APA title case from a single toolkit.
Counting + Stats
Measure characters, words, lines, and reading time with multi-byte aware counters.
Encoding & Escape Lab
Toggle between URL encoders and HTML entity helpers from a single toolkit.
Extraction Helpers
Pull numbers, URLs, emails, hashtags, and mentions from any text payload.
Line Numbering Lab
Add line numbers to text with flexible padding and blank-line handling.
Password Generator
Generate secure passwords with presets, entropy insights, and instant copy controls.
Quote Meta Helper
Escape regex metacharacters so patterns treat text literally.
Slash Escape Helper
Add backslashes for safe storage or strip them from legacy payloads.
Slugify Helper
Turn headlines into URL-ready slugs with duplicate detection and style presets.
Sorting & List Tools
Sort, reverse, and reorder text lists with numeric and case-aware controls.
Text Diff Checker
Compare two text blocks side-by-side, copy patch output, and track added/removed lines.
Whitespace Utilities
Trim edges, collapse spaces, and tidy blank lines with line-aware controls.
Image utilities
Convert, compress, and inspect images without leaving the browser.
Favicon Generator
Generate multi-size favicons, Apple touch icons, and manifest snippets from one upload.
Image Converters
Convert from one image format to another.
Image → Base64 Encoder
Turn local images into Base64 strings or data URIs with instant previews and metadata.