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Developer Tools

49 free, fast, browser-based tools — encoders, converters, formatters, generators & more.

Showing all 49 tools

Ascii Table Interactive ASCII and Unicode character reference table. Search, filter, and explore all 128 ASCII characters with decimal, hex, octal, binary, HTML entity, and description. Quick convert any character instantly. Reference Backslash Escape Tool Add or remove backslash escapes for various programming languages. Supports JavaScript, JSON, Python, Java, C/C++, SQL, HTML, and more with real-time conversion. Encoders & Decoders Barcode Tool Advanced barcode generator. Create Code128, EAN-13, QR Code, UPC-A and more. Customize colors, dimensions and download as PNG or SVG. Generators Base64 Forge An advanced tool to encode text and files to Base64, and decode Base64 strings back to their original form. Supports text and file inputs. Encoders & Decoders Chmod Calculator Interactive Unix file permissions calculator. Convert between octal, symbolic, and checkbox representations. Supports SUID, SGID, Sticky bit, common presets, and chmod command preview. Calculators Code Formatter A simple yet powerful code formatter that supports HTML, CSS, JavaScript, JSON, and more. Paste your messy code and get a clean, beautifully formatted version. Formatters Color Converter Advanced color conversion tool. Convert between HEX, RGB, HSL, HSB/HSV formats. Generate color palettes, check WCAG contrast, create shades and tints. All in your browser. CSS & Design Cron Expression Builder Visual cron expression builder and parser. Create, validate, and understand cron schedules with a human-readable description and next execution times. DevOps Css Flexbox Playground Interactive CSS Flexbox builder and playground. Visually experiment with flex-direction, justify-content, align-items, flex-wrap, gap, and per-item properties. Generate ready-to-use CSS and HTML code. CSS & Design Css Gradient Generator Visual CSS gradient builder. Create stunning linear, radial, and conic gradients with live preview, color stops, presets, and instant CSS output. All in your browser. CSS & Design Css Grid Generator Visual CSS Grid layout builder. Design grid layouts with customizable columns, rows, gaps, and cell spanning. Copy production-ready CSS and HTML instantly. CSS & Design Css Minifier Minify and beautify CSS code with line numbers, character count, and download. Remove whitespace, comments, and optimize CSS for production or format it for readability. Minifiers & Optimizers Csv Json Converter Advanced CSV to JSON converter and JSON to CSV tool. Convert between CSV, JSON, and TSV formats with drag-drop file upload, sortable table preview, custom delimiters, and edge case handling. Converters Data Uri Converter Convert files to Data URIs with automatic MIME type detection, base64 encoding, image preview, and size calculation. Perfect for embedding images in CSS and HTML. Converters Diff Checker An advanced tool to compare two blocks of text and highlight the differences. See additions, deletions, and modifications side-by-side. Text Dns Tools Box An all-in-one DNS toolbox for live DNS lookups, DNSSEC validation, CAA record checking, DMARC record validation, and a `dig` command simulator. Network & Security Encoding Detective Text encoding analysis and conversion tool. Auto-detect Base64, URL encoding, hex, HTML entities, Unicode escapes, JWT, and more. Decode through multiple layers, view hex dumps, and convert between encoding formats. Encoders & Decoders Epoch Converter Advanced Unix timestamp and epoch converter. Convert between Unix timestamps and human-readable dates, compare timestamps, perform date math, and view live clocks across timezones. Converters File Diff Checker Upload two text-based files to see a line-by-line comparison of the changes. Ideal for comparing source code, configuration files, and more. Text Hash Generator Advanced hash generator tool supporting MD5, SHA-1, SHA-256, SHA-384, SHA-512 with HMAC mode, file hashing via drag-and-drop, real-time computation, and hash comparison. All processing happens client-side. Network & Security Html Entity Encoder Encode and decode HTML entities with named, decimal, and hexadecimal formats. Searchable reference table of 200+ HTML entities with category filtering. Real-time conversion. Encoders & Decoders Html Minifier Minify and beautify HTML code with syntax highlighting, line numbers, and character count. Compress HTML for production or format it for better readability with instant download. Minifiers & Optimizers Http Status Reference Interactive HTTP status code reference. Search, filter, and explore all standard HTTP status codes (100-511) with descriptions, use cases, and example responses. Essential developer tool. Reference Image Base64 Converter Convert images to Base64 strings and Base64 back to images. Supports PNG, JPEG, GIF, WebP, SVG, and ICO. Drag-and-drop upload, resize, copy, and download. All processing happens client-side. Converters Javascript Minifier A powerful JavaScript minifier and beautifier. Minify JS to reduce file size, beautify compressed code, view syntax highlighting, and download results. All processing done client-side. Minifiers & Optimizers Json Toolkit A powerful JSON toolkit to format, minify, and visualize your JSON data. Features a beautifier, minifier, and an interactive tree view. Formatters Json Yaml Converter Bidirectional JSON to YAML and YAML to JSON converter. Real-time conversion with validation, syntax highlighting, indent control, minify/beautify, and support for YAML features like multi-line strings and anchors. Converters Jwt Studio The ultimate tool for encoding, decoding, and verifying JSON Web Tokens (JWTs). Supports various algorithms and key generation. Network & Security Lorem Ipsum Generator Advanced Lorem Ipsum placeholder text generator with multiple styles including Classic, Hipster, Tech, and Business Ipsum. Generate paragraphs, sentences, words, or lists with full customization. Generators Markdown Preview A powerful live Markdown editor with real-time preview, GitHub Flavored Markdown support, syntax highlighting, toolbar formatting, and export options. Write beautiful documentation instantly. Text Merge Conflict Resolver A visual Git merge conflict resolver. Paste your conflicting files to see a diff of 'Mine' (HEAD) vs. 'Theirs' (Incoming) and edit the final output. Text Nginx Config Builder Visual Nginx configuration generator with server blocks, location routing, SSL/TLS, security headers, gzip compression, and rate limiting. Generate production-ready nginx.conf files with syntax highlighting. DevOps Number Base Converter Advanced number base converter with real-time conversion between binary, octal, decimal, hexadecimal, and custom bases up to 36. Features bit visualization, bitwise operations, IEEE 754 floating point breakdown, and two's complement support. Calculators Password Generator Secure password and passphrase generator with strength meter, entropy calculation, crack time estimates, bulk generation, and password history. Uses crypto.getRandomValues() for cryptographic randomness. Generators Pixel Unit Converter CSS unit converter tool. Convert between px, rem, em, %, pt, vw, vh, vmin, vmax, cm, mm, and in. Generate spacing scales, typography scales, fluid clamp() values, and view common breakpoints. CSS & Design Qr Code Generator Advanced QR code generator with support for Text, URL, Email, Phone, WiFi, and vCard. Customize colors, size, and error correction. Download as PNG or SVG. All processing happens client-side. Generators Regex Playground Advanced regex testing tool with real-time match highlighting, capture groups, common patterns library, and find-and-replace. Test and debug regular expressions instantly in your browser. Text Sql Formatter A powerful SQL formatter and beautifier with syntax highlighting, indentation options, keyword casing, minification, and error detection. Format complex SQL queries instantly. Formatters Ssl Certificate Decoder Decode and inspect SSL/TLS certificates online. Parse PEM-encoded X.509 certificates to view subject, issuer, validity, SANs, key usage, fingerprints, and certificate chain details. All processing happens client-side. Network & Security String Escaper Multi-language string escape and unescape tool. Supports JSON, JavaScript, Python, Java, C#, XML, SQL, CSV, Regex, and Shell/Bash escaping with real-time conversion and escape sequence highlighting. Encoders & Decoders Subnet Calculator Advanced IPv4 subnet calculator. Calculate network address, broadcast address, usable hosts, subnet mask, wildcard mask, and more. Visualize binary IP representations and divide networks into subnets. Network & Security Svg Optimizer Optimize SVG code with preview, size reduction metrics, and optimization options. Remove unnecessary data, compress paths, and reduce file size while maintaining quality. Minifiers & Optimizers Text Transform Studio Advanced text transformation and analysis tool. Transform case, sort lines, extract data, find and replace with regex, and get detailed text statistics. All processing happens in your browser. Text Toml Editor Advanced TOML editor with syntax highlighting, real-time validation, and JSON conversion. Edit and validate TOML configuration files instantly in your browser. Formatters Url Encoder Decoder Advanced URL encoding and decoding tool. Encode/decode URLs with encodeURIComponent, encodeURI, Base64 URL encoding. Parse URLs into components, validate URLs, and process bulk operations. Encoders & Decoders Uuid Generator Advanced UUID and unique ID generator supporting UUID v4, UUID v7, NanoID, and ULID. Bulk generation, validation, timestamp extraction, and customizable options. Generators Visual Text Comparison A visual text comparison tool to easily compare two blocks of text and see a word-by-word highlight of the differences. Text Xml Formatter Format and validate XML with tree view visualization, error reporting, and line numbers. Beautify XML for better readability and detect syntax errors instantly. Formatters Yaml Validator A powerful YAML validator, formatter, and converter. Validate YAML syntax, beautify with configurable indentation, minify, convert to JSON, and view statistics with syntax highlighting. Formatters