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Tutorials, tips, and industry insights
Encode text/files to Base64 and decode Base64 strings instantly. Client-side, supports UTF-8, file uploads, Standard/Base64URL/MIME presets.
Compare UUID v4 (random) vs v7 (timestamp-ordered). Database performance benchmarks, code examples for 8 languages, collision analysis, and when to use each version.
Free online SQL formatter for MySQL, PostgreSQL, SQLite, T-SQL, BigQuery. Beautify complex queries, validate syntax, configure style. Client-side, privacy-first.
Free online hash generator for text and files. MD5, SHA-1, SHA-256, SHA-384, SHA-512 with HMAC support. Client-side Web Crypto API, batch mode, file streaming.
Free online image compressor with quality control. Batch compress JPEG, PNG, WebP, AVIF. Resize, strip EXIF, progressive enhancement. Client-side, no uploads.
Free online URL parser for developers. Parse protocol, host, path, query params, hash. Decode percent-encoding, edit components, reconstruct. Client-side, privacy-first.
Free online Unix timestamp converter. Seconds, milliseconds, ISO 8601, RFC 2822. Timezone support, batch mode, relative time. Client-side, no tracking.
Free online regex tester with capture groups, named groups, flags (g,i,m,s,u,y), substitution, and explanation. Web Worker powered for large inputs. Client-side.
Free online text diff checker with side-by-side, unified, and inline views. Word/character-level diff, ignore whitespace, patch export. Web Worker powered, client-side.
Free online word counter with readability analysis. Flesch-Kincaid, Gunning Fog, SMOG, ARI, Coleman-Liau indices. Reading/speaking time, keyword density. Real-time, client-side.
Free online DNS lookup for developers. Query A, AAAA, MX, NS, TXT, CNAME, SOA, CAA records. DNSSEC validation, multiple DoH resolvers, raw response. Client-side.
Free online IP subnet calculator for IPv4/IPv6. CIDR, netmask, wildcard, usable hosts, subnet splitting, supernetting. VLSM support, point-to-point /31. Client-side.
Free online cron expression generator with visual builder. Standard 5-field, Quartz 6-field, Spring, systemd timers. Next run preview, validation, timezone support. Client-side.
Free online color converter for designers and developers. HEX, RGB, HSL, HSV, CMYK, LAB, OKLCH with alpha. Color harmonies, WCAG contrast, palette export. Client-side.
Complete guide to 140+ free developer tools: formatters, encoders, generators, converters, security, image, network utilities. All client-side, no tracking, open source.
Complete guide to formatting, validating, and beautifying JSON online. Covers syntax highlighting, error detection, large file handling, and privacy-first tools.
Debug authentication issues fast. Paste any JWT to inspect header, payload, and signature. Supports HS256, RS256, ES256, EdDSA with JWKS verification.
Create cryptographically strong passwords using Web Crypto API. 100% client-side, configurable entropy, passphrase mode, zero tracking.
Transform JSON arrays to spreadsheet-ready CSV with nested object flattening, custom delimiters, and large file support. No uploads, no limits.
Generate QR codes for 10 formats with custom colors, logos, and error correction. URL, contact, WiFi, calendar, crypto payments — all client-side.
Learn everything you need to know about JSON, from basic syntax to advanced use cases in modern web development.
A deep dive into JSON Web Tokens, including structure, signing algorithms, and security best practices.
Best practices for optimizing images to improve page load times without sacrificing quality.
A comprehensive guide to password security, including password managers, passkeys, and what to do if you're breached.
Everything developers need to know about UUIDs, including v4 vs v7, use cases, and best practices.