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Free online developer tools: format JSON, decode JWTs, generate UUIDs, test regex, and validate schemas 100% in-browser with zero server logging or tracking.
CSPRNG UUID v4/v7 generator, Base64/URL transformer, Unix epoch timestamp clock, JSON prettifier, and web cheatsheets.
Dedicated in-depth tools with advanced AST syntax parsing, multi-language code generators, and file exports.
Beautify, inspect, validate, and minify nested JSON documents.
Generate RFC 4122 v4 and RFC 9562 v7 time-ordered identifiers.
Convert text or files to Base64 and Base64URL offline.
Encode URI components and query strings with RFC 3986 compliance.
Test regular expressions with real-time match groups and flags.
Compute MD5, SHA-256, SHA-512, and HMAC digests client-side.
Minify JavaScript, CSS, and HTML to reduce payload bandwidth.
Convert Markdown to clean HTML with live split-screen preview.
Resolve domain names to IPv4/IPv6 addresses and PTR records.
Lookup IPv4 and IPv6 network prefixes, CIDR, and reverse DNS.
Extract domains, subdomains, and TLDs from unstructured text.
Parse and deduplicate valid email addresses from text dumps.
Generate layered CSS box shadows with live interactive visual preview.
Analyze payloads for Cross-Site Scripting vectors and HTML vulnerabilities.
Free JSON formatter & validator: beautify, validate, auto-repair, and query JSONPath 100% locally in your browser. Fast, private, with zero server uploads.
Free tool to stringify JSON online: escape JSON into string literals or unescape stringified payloads back to JSON. 100% private in-browser.
Free online SEO content checker: audit readability, analyze keyword density, check heading hierarchy, and simulate Google SERP snippets 100% locally in-browser.
Preview and audit meta tags, Open Graph cards, and Google SERP snippets in real time. 100% private in-browser tool with Next.js, HTML & React tag generator.
Free Google Ads headline generator: create high-converting 30-character Responsive Search Ads headlines with live SERP preview, Ad Strength score, and CSV export.
Free Google Ads description generator to create high-converting 90-character RSA descriptions, headlines, and live SERP previews.
Generate, test, and preview Open Graph and Twitter Card meta tags for Facebook, Twitter/X, LinkedIn, Discord, and Slack.
Extract, audit, and preview Open Graph, Twitter Cards, SEO tags, and JSON-LD schema from any URL or HTML code.
Validate robots.txt crawl rules, XML sitemaps, and search engine directives offline in your browser.
Free noindex checker: audit meta robots tags & X-Robots-Tag HTTP headers online. Test Googlebot indexing status, detect crawl traps, and fix SEO directives.
Validate HTML5 markup online for free. Check W3C living standards, WCAG 2.1 accessibility, heading outline, and SEO tags with zero latency.
Generate Apache .htaccess configuration files for HTTPS, canonical redirects, caching, compression, and security hardening.
Fast, private client-side Base64 encoder and decoder. Supports RFC 4648 URL-safe mode, MIME 76 line wrapping, PEM 64 chunks, RFC 4180 CSV matrix, hex dump, file upload/download, and DevToys smart clipboard detection.
Free online URL encoder decoder: percent-encode or decode URLs across 5 RFC-3986 modes with zero server uploads.
Convert binary to hexadecimal, decimal, and text 100% locally with 4-bit nibble breakdowns and bitwise logic.
Convert numbers between Hexadecimal (base-16) and Decimal (base-10) with step-by-step math proofs, binary nibbles, and IEEE-754 floats.
Free online percentage calculator: compute %, percentage increase/decrease, ratios, base totals, and fractions with step-by-step math. 100% private & offline.
Calculate 2D shape areas, perimeters, unit conversions, and multi-room project surface totals offline.
Free online length unit converter: convert meters, feet, inches, miles, and km instantly. 100% private with interactive fractional ruler and multi-unit matrix.
Free electrical unit converter: convert Voltage, Current, Resistance, Farads and Watts. Solve Ohm's Law privately in-browser with 1-click quick copy.
Free online power unit converter: convert Watts, kW, horsepower (hp, PS), BTU/hr and TR instantly. 100% private in-browser tool with P=VI and torque solvers.
Convert kilograms, pounds, ounces, grams, stone, troy ounces, carats, tolas, and atomic mass units with culinary density solvers and planetary gravity calculators.
Convert pressure, power, force, torque, viscosity, flow rate, density, and thermal properties across 14 technical domains offline.
Free temperature converter: convert between 8 temperature scales (Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Réaumur, Rømer) with interval mode and thermal energy calculations.
Calculate 10-year major osteoporotic fracture & hip fracture risk probability with clinical risk factors and BMD scoring.
Check whether a UK rental property requires Mandatory HMO, Additional, Selective, or Section 257 licensing with room space and amenity compliance.
Free online cURL to code converter: convert cURL requests to JavaScript, Python, Go, Rust, PHP, and Java instantly with 100% client-side privacy.
Convert and check temperatures across 8 scales (Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, Delisle, Newton, Rømer) with visual thermal gauge, delta intervals, specific heat, and weather comfort index.
Generate sequential numbers, zero-padded IDs, hex/binary codes, Roman numerals, or randomized lists in your browser.
Sort lists of numbers in ascending or descending order online. Supports decimals, negative values, delimiters, and stats.
Generate real world countries with ISO codes, capitals, currencies, flags, and dial codes, or create fictional fantasy nation names.
Free online hash generator: compute MD5, SHA-1, SHA-256, SHA-512 digests instantly. 100% client-side with zero server uploads and file checksum verification.
Free online UUID generator: create secure UUID v4, time-ordered v7, ULID, and NanoID identifiers offline with smart clipboard auto-detect and live inspector.
Decode, verify HMAC signatures, inspect claims, diagnose expiration, and craft JSON Web Tokens (RFC 7519) with 100% offline client-side security.
Free online CSV to JSON converter: transform CSV, TSV, and tabular data into JSON arrays or objects instantly. 100% client-side with zero server uploads.
Convert epoch time to date and Unix timestamps 100% locally with multi-precision scale, batch logs, and SQL range bounds.
Calculate duration between dates, exact age, business working days, or add/subtract time offline.
Free SQL formatter: beautify, align, and minify SQL queries across PostgreSQL, MySQL, SQLite, and T-SQL. 100% private client-side engine with zero server logs.
Free regex tester: test regular expressions online with live match overlays, capturing groups, ReDoS risk detection, and code generation. 100% private.
Free HTML entities encoder & decoder to escape special characters into named, decimal, hex, or unicode entities offline with zero latency.
Convert Markdown to HTML with live GFM visual rendering and syntax controls.
Compress CSS, JavaScript, HTML, and JSON code to reduce file size by 20–60% with instant in-browser AST minification.
Format, validate, and minify XML markup with DevToys-style smart clipboard auto-detection, DOM AST tree inspection, and 7-format quick export.
Generate W3C XML Schema Definitions (XSD) from XML instances with Russian Doll, Venetian Blind, and Salami Slice designs.
Free online YAML converter: validate syntax, format multi-document manifests, and convert YAML to JSON, TypeScript, or CSV instantly. 100% private in browser.
Convert JSON to YAML and YAML to JSON instantly online. 100% private in-browser tool with multi-doc manifests, TypeScript export, and zero server uploads.
Free random number generator: draw secure integers, decimals, Gaussian curves, and lottery picks. 100% private client-side CSPRNG with 1-click quick copy.
Generate industrial 1D linear barcodes (Code 128, EAN-13, UPC-A, Code 39, ITF-14) with vector SVG, high-res PNG, bulk ZIP export, and printable label sheets.
Boost productivity with 25-minute focus sessions, customizable breaks, and task tracking.
Build, parse, and validate cron schedules visually with smart clipboard auto-detect, human-readable explanations, next 10 run previews, and multi-format script exports.
Precision online countdown timer with target date milestones, interval presets, Web Audio chimes, and ICS export.
Precision online count up timer and stopwatch with millisecond accuracy, lap splits, pace analysis, target alerts, and CSV export.
Precision online world time clock with multi-timezone matrix, interactive meeting planner time scrubber, analog & digital clock faces, and calendar export.
Convert domain names to IP addresses or perform reverse DNS lookups. Supports bulk conversion and IPv4/IPv6.
Search and lookup detailed IP address geolocation, network ISP, ASN, hostname, and security information.
Extract root domains, hostnames, subdomains, or full URLs from unstructured text, HTML, or server logs.
Extract, deduplicate, filter, and normalize email addresses from text, HTML, logs, or CSV files.
Convert PNG, JPEG, SVG, WebP, GIF, BMP, and ICO images to Base64 Data URI strings for HTML, CSS, JSX, and JSON instantly. Decode Base64 back to images offline with DevToys smart clipboard auto-detect.
Create and stack multi-layered CSS box shadows with 2D light joystick, live component preview, and instant CSS or Tailwind export.
Free passcode hash generator: generate salted Bcrypt & PBKDF2 password hashes, decode hash structures, and verify matches 100% locally with zero server logs.
Audit HTML snippets, URL parameters, and code payloads for Cross-Site Scripting (XSS) vulnerabilities. 100% client-side OWASP scanner & sanitizer.
Calculate required sample sizes, margin of error, Z-scores, and confidence intervals offline.
Calculate Pearson correlation (r), determination (R²), binomial combinations (nCk), CV %, and polynomial coefficients offline.
Approximate definite integrals with Simpson's 1/3 rule, 3/8 rule, or discrete points with step-by-step tables and interactive graph.
Pure in-memory execution designed for speed, privacy, and zero server logging.
Choose from JSON/SQL formatters, Regex tester, UUID generator, JWT decoder, and minifiers.
Input your code snippets, JSON schemas, tokens, or configuration strings safely.
Tokens and schemas are parsed in-browser using WebCrypto and standard AST engines.
Copy formatted output, multi-language snippets, or export structured JSON audit reports.
Compare our 100% client-side zero-server architecture against traditional cloud developer toolboxes.
| Dimension | Telekit Developer Tools | Traditional Cloud Developer Toolboxes |
|---|---|---|
| Code & Token Privacy | ✓ 100% private; tokens, keys, and payloads processed strictly in browser RAM; 0 server logging | Payloads transmitted to remote backend servers with risk of cloud retention or access log leaks |
| Offline & Air-Gapped Capability | ✓ Fully functional offline via Service Worker & local JavaScript engine; safe for air-gapped dev environments | Requires uninterrupted internet access; completely fails offline or behind strict corporate firewalls |
| Payload Limits & Throttling | ✓ Unlimited payload size bounded only by device RAM; zero artificial truncations, rate limits, or paywalls | Restricts inputs to 50KB–1MB or throttles repeated API requests behind subscription tiers |
| Ad-Free Developer Experience | ✓ Modern glassmorphic interface with 0 banner ads, video interstitials, or third-party trackers | Heavily cluttered with third-party tracking scripts, display ads, and intrusive popups |
| Execution Speed & Hotkeys | ✓ Instant 0ms round-trip execution; full keyboard shortcuts support (Cmd+K, Alt+C, Esc) and auto-detection | High network latency on every submission; slow full-page reloads and lack of keyboard navigation |
| Account & Telemetry Tracking | ✓ Zero login or registration required; 100% anonymous with zero user profiling or cookies | Mandatory user accounts, SSO authentication barriers, and persistent marketing tracking |
| Bidirectional Transforms & Schemas | ✓ Bidirectional JSON ↔ YAML, Base64 ↔ Hex, and Unix ↔ Date converters with AST syntax error pointers | One-way conversions only or disjointed standalone tools with no schema error diagnostics |
| Clipboard Security & Async Handling | ✓ Native HTML5 Async Clipboard API with visual feedback; zero background telemetry or paste snooping | Unsecured clipboard reading with third-party analytics and persistent tracking cookies |
Everything you need to know about our general developer tools.
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Free online social media tools: verify Telegram & WhatsApp invite links anonymously, inspect group status, and create custom QR codes with zero login required.
Merge multiple PDFs, slice page ranges, compress file sizes, convert formats, optimize SVGs, and crop graphics 100% locally in your browser with zero server uploads and lossless quality.
Free online image tools: compress photos, convert formats (WebP, PNG, JPG), crop graphics, and pick colors 100% in-browser with zero uploads or tracking.
Calculate percentages, geometric areas, sample sizes, correlation coefficients, definite integrals, and polyhedral dice probabilities 100% locally in your browser with zero calculation logging.