All Tools - Directory of 172 Developer Tools (JSON / Encoding / Crypto / Network / Media)

Online JSON formatter: beautify, minify, validate JSON with one click. Convert to TypeScript/Go/Java. Unicode-safe, supports Chinese and Emoji.

Online JSON diff comparison tool: visually compare two JSON objects and highlight added, removed, and modified fields. Supports array comparison.

Free online JSON flattener. One-click to flatten nested JSON into dot-separated key-value pairs, or restore flattened JSON back to nested structure. Supports custom separators (dot, underscore, slash, etc.) for data processing and API debugging.

Free online JSON key sorter supporting ascending/descending order and recursive sorting of nested structures for easy diffing and code review. Local processing only.

Online JSONPath query tool: extract specific fields from JSON data using JSONPath expressions. Supports filters, recursive descent, wildcards.

Free online JSONPath extractor. Click JSON tree nodes to auto-generate path expressions with wildcard support.

Online JSON Schema validation tool: validate JSON data against JSON Schema definitions. Supports format validation, type checking, required fields.

Online JSON Schema generator: paste JSON data and automatically generate the corresponding JSON Schema definition. Supports nested objects, arrays, type inference, runs locally in browser.

Online visual JSON Schema editor: build and edit JSON Schema documents with a form-based interface. Add properties, set types, mark required fields, support nested objects and arrays. Import existing schemas.

Online JSON to CSV converter: transform JSON arrays or objects into CSV format. Custom delimiter, headers, flatten nested objects. One-click CSV download.

Free online JSON ↔ YAML bidirectional converter with real-time preview. Quickly convert config file formats.

Online YAML and JSON bidirectional converter: YAML to JSON, JSON to YAML. Preserves data structure, supports nested objects and arrays.

Free online XML ↔ JSON bidirectional converter with formatted output. Quickly convert data formats.

Online CSV and JSON converter: auto-detects headers, type inference. Convert CSV to JSON array, JSON to CSV table. Essential for data cleaning and API development.

Free online CSV/TSV/JSON/Markdown format converter with custom delimiter and header options.

Online CSV data conversion tool: convert CSV to SQL INSERT statements, Markdown tables, or HTML tables with one click. Supports custom table names.

Free online SQL Mock Query: execute SQL statements in the browser with no database required. Supports CREATE, INSERT, and SELECT for practicing query syntax. All local processing.

Online CSV data visualization tool: paste CSV data to generate interactive bar, line, pie, and scatter charts. Auto-detects numeric columns, supports dark mode, all processing in-browser.

Free online HTML ↔ Markdown bidirectional converter. One-click conversion for blog posts and documents.

Convert Excel (.xlsx/.xls) files to CSV format online. All processing is done locally in your browser.

Convert Excel files to JSON object arrays online. All processing is done locally in your browser.

Convert Excel files to HTML tables online. All processing is done locally in your browser.

Convert Excel files to Markdown table format online. All processing is done locally in your browser.

Convert CSV data to Excel (.xlsx) file and download online. All processing is done locally in your browser.

Convert Excel workbooks to Word documents online: each sheet becomes a Word table, processed locally in your browser with no upload.

Convert Markdown to a Word document online: headings, lists, tables and code blocks become native Word styles, fully local.

Convert HTML snippets or rich text to PDF online with layout preserved, rendered locally in your browser.

Convert JSON object arrays to Excel (.xlsx) file and download online. All processing is done locally in your browser.

Online HTML Table to CSV converter: parses table/tr/td elements from HTML fragments, extracts table data, and outputs standard CSV. Supports complex table structures. All processing is done locally.

Online HTML Table to JSON converter: parses HTML tables into JSON object arrays, using header cells as keys and data cells as values. Essential for web data extraction. All processing is done locally.

Online HTML Table to Markdown converter: transforms HTML table elements into Markdown table syntax for README files and documentation. Preserves alignment and structure. All processing is done locally.

Online CSV Generator: customize rows and columns to instantly generate sample CSV data with headers. Perfect for testing, demos, and mock data. All processing is done locally.

Online JSON Generator: customize rows and fields to instantly generate sample JSON array data. Ideal for API testing, mock data, and frontend development. All processing is done locally.

Online Markdown live preview: supports GFM (GitHub Flavored Markdown) including tables, code blocks, lists, and links.

Free online Markdown table generator with visual editing, CSV import, and alignment settings. Create tables quickly.

Free online Markdown table of contents generator that auto-parses headings to create TOC with GitHub/GitLab anchor format support.

Online timeline visualization tool: paste JSON array with timestamps to generate interactive scatter, line, or area charts. Supports ISO dates, Unix timestamps, and multiple event categories.

Online Markdown Table to CSV converter: parses pipe-delimited Markdown table syntax, extracts headers and data rows, and outputs standard CSV with proper quote escaping. Essential for documentation and data cleaning. All processing is done locally.

Online Markdown Table to JSON converter: transforms Markdown tables into JSON object arrays, using the first row as keys and subsequent rows as values. Ideal for API development and data processing. All processing is done locally.

Online Markdown Table to SQL converter: generates INSERT statements from Markdown tables, automatically creating CREATE TABLE and data insertion scripts. Essential for documentation-to-database workflows. All processing is done locally.

Online text statistics tool: real-time count of characters, words, lines, sentences, and paragraphs.

Online text case converter: UPPER CASE, lower case, Title Case, camelCase, snake_case, kebab-case, CONSTANT_CASE.

Online slugify tool: turn any title into a URL-friendly slug with automatic Chinese-to-pinyin conversion, separator and case options. Perfect for blog post URLs and SEO-friendly links. Runs locally in your browser.

Free online URL slug generator that converts titles into SEO-friendly slugs with hyphen/underscore separators, lowercase toggle, and CJK support. Runs locally.

Free online text sort tool. Supports alphabetical, numerical, natural, by-length sorting and more.

Free online text reverser supporting character, word, and line modes with correct CJK and Emoji handling. All processing runs locally in your browser.

Free online whitespace remover with trim, remove empty lines, collapse spaces, and strip all whitespace modes. Essential for text cleanup. Runs locally.

Free online text deduplication tool. Quickly remove duplicate lines, supports ignore case, sort and more options.

Free online text extraction tool, quickly extract emails, phone numbers, URLs, IP addresses, ID numbers, supports custom regex

Free online text find and replace tool with regex support, case insensitivity, capture group references, and batch text replacement.

Free online line batch processing tool: add prefix/suffix, remove empty lines, line numbers, dedupe, reverse, filter — all in one click.

Free online image to ASCII art converter with monochrome/color modes, adjustable width and character sets, all processed locally with no uploads

Online text diff comparison tool: uses LCS algorithm to compare two texts line by line, highlighting additions, deletions, and modifications. Powered by Monaco DiffEditor with syntax highlighting.

Free online Diff Summary Tool for developers. Try instantly with no setup. All local processing.

Analyze which character appears most frequently in ciphertext or plain text. Visual bar chart, sort options, CSV export. Free, local processing.

Online Base64 encoder and decoder with full Unicode support (Chinese, Emoji, multi-byte characters). All processing runs locally in your browser. No data sent to servers.

Free online Base64 batch encoding and decoding tool with multi-line batch processing, URL Safe variant, and original text reference.

Free online Base32 and Base58 encoder/decoder tool. Supports bidirectional conversion.

Free online Data URI generator tool supporting file and text to data: protocol URL conversion with both Base64 and URL encoding options.

Online URL encoder and decoder tool. Supports URI component encoding (encodeURIComponent) and full URL encoding. Processed locally in your browser.

Online HTML entity encoder and decoder. Convert <, >, &, " and other special characters to HTML entities, or decode them back. Processed locally in your browser.

Free online HTML entity encoder/decoder supporting 244 named entities, with decimal/hexadecimal/named entity conversion.

Free online Unicode encoder/decoder. Convert between Chinese/Japanese characters and \uXXXX format for i18n debugging.

Online number base converter: convert between binary, octal, decimal, and hexadecimal.

Free online number base converter. Supports binary/octal/decimal/hexadecimal conversion with bit operations and bit visualization.

Free online byte unit converter. Quickly convert between B, KB, MB, GB, TB, PB and KiB, MiB, GiB, TiB. Supports both decimal (1000) and binary (1024) standards. Essential tool for developers and DevOps engineers.

Online code formatter powered by Prettier. Supports JavaScript, HTML, CSS, SQL formatting and safe minification. Protects string literals from being broken.

Online SQL formatting tool: supports MySQL, PostgreSQL, SQLite, BigQuery dialects. Uppercase/lowercase keywords, configurable indentation. Format or minify SQL statements instantly.

Free online HTML formatter supporting beautify and minify, with adjustable indent size and options to keep comments and blank lines.

Online HTML minification and formatting tool: compress by removing comments and whitespace, or format with proper indentation. Preserves script/style tag contents.

Online CSS minification and formatting tool: compress by removing comments and whitespace, or format with proper layout. Protects string literals.

Free online CSS unit converter supporting px, rem, em, pt, and vw with customizable root font size and viewport width. Processed locally, no uploads.

Online JavaScript minification and formatting tool: compress by removing comments and whitespace, or format with Prettier. Protects string literals.

Free online JSON to TypeScript interface tool, auto-generate interface and type, supports nested objects and arrays

Free online JSON to Go Struct tool. Auto-generate struct definitions with json tag and omitempty support.

Free online JSON to Java Class tool. Auto-generate POJO classes with getter/setter/Lombok/Jackson annotation support.

Free online Java to JSON converter: paste Java objects or getters/setters and get JSON instantly. Browser-local processing, your code never leaves the machine.

Free online mock data generator with 28 data types, JSON/CSV/TSV/YAML formats, batch generate test data

Free online SQL CREATE TABLE statement generator with visual table structure design, supporting MySQL, PostgreSQL, and SQLite.

Free online tool to convert cURL commands to HTTP request code in JavaScript (Fetch/Axios), Python (requests), Java, Go, and more. One-click conversion for quick integration.

Convert HTML to React JSX online. Automatically handles className, htmlFor, camelCase attributes, style objects, and self-closing tags. Free, no login, local processing.

Free online Dockerfile generator. Multi-language base images, multi-stage builds, health checks, and COPY instructions. Generate production-ready Dockerfiles instantly.

Convert docker run commands into docker-compose.yml instantly: ports, volumes, env vars, restart policies and networks mapped automatically, with multi-line and --flag=value support. Runs entirely in your browser.

Online XML formatter and minifier: pretty indentation or single-line compression, precise syntax error hints, attribute preservation and escaping. Local processing.

Free online .gitignore generator supporting 20+ languages/frameworks/IDEs. Generate ignore file configurations in one click.

Free online CSS Flexbox generator with visual flex layout property adjustment, real-time preview, and one-click CSS code copying

Free online CSS Grid generator with visual grid layout adjustment, custom row/column gaps, real-time preview, and one-click code copying

Handy Git Cheatsheet for developers: covers basic operations, branch management, remote collaboration, and undo/revert scenarios. Searchable and categorized for quick reference. All local processing.

Handy Docker Cheatsheet for developers: covers image management, container operations, networks and volumes, and Compose. Searchable and categorized for quick reference. All local processing.

Handy Linux Commands Cheatsheet for developers: covers file operations, text processing, process management, and network troubleshooting. Searchable and categorized for quick reference. All local processing.

Online chmod calculator: toggle the rwx permission matrix to get the octal (755), symbolic (rwxr-xr-x) form and the chmod command instantly; or type 755 / rwxr-xr-x to reverse-lookup. Includes setuid/setgid/sticky bits and common permission presets.

Handy SQL Cheatsheet for developers: covers queries, aggregations, joins, subqueries, and window functions. Searchable and categorized for quick reference. All local processing.

Handy Regex Cheatsheet for developers: covers metacharacters, quantifiers, groups, lookarounds, and common patterns. Searchable and categorized for quick reference. All local processing.

Online MD5 hash generator: enter text to get a 32-character MD5 hash. Computed locally in browser, data never sent.

Free online SHA-1 hash generator: paste text and instantly get the 40-character hex digest. Covers git commit IDs and legacy checksums. Computed locally in your browser, never uploaded.

Online hash calculator: SHA-1, SHA-256, SHA-384, SHA-512. Powered by Web Crypto API, computed locally in browser.

Free online SHA-512 hash generator: paste text and instantly get the 128-character hex digest. Ideal for download verification and HS512 signing. Computed locally in your browser, never uploaded.

Online SM3 hash calculator: instant 256-bit digests for any text including Chinese and Emoji. SM3 is the Chinese national standard (GM/T 0004-2012), comparable to SHA-256. Runs locally in your browser.

Free online hash verifier tool. Supports MD5/SHA1/SHA256/SHA512 algorithms, text and file hash computation, one-click expected value comparison.

Free HMAC online generator: create HMAC-SHA256, HS256, SHA1, MD5 signatures with any secret key. All computation stays in your browser.

Online AES-GCM encryption tool: PBKDF2 key derivation 256-bit. Processed locally in browser, ciphertext and password never sent.

Free online RSA encryption and decryption tool. Supports 1024/2048/4096 bit key generation, public key encryption and private key decryption.

Online SM2 public-key tool: generate keypairs, encrypt/decrypt (C1C3C2 per GB/T 32918.4-2016), sign and verify. SM2 is a 256-bit ECC scheme, the Chinese alternative to RSA. Local-only, private keys never leave your device.

Online SM4 block cipher tool: ECB/CBC modes, PKCS#7 padding, random key generation with visibility toggle. 128-bit blocks per GB/T 32907, the Chinese national alternative to AES-128. Fully local, nothing uploaded.

Free online PGP encryption tool: public-key encrypt, decrypt, sign and verify with locally generated key pairs — everything runs in your browser.

Online Bcrypt password hashing tool: generate password hashes and verify passwords against hashes. Adjustable salt rounds, essential for authentication development.

Online JWT decoder with HS256 signature verification. Decode Header, Payload, Signature locally — hs256 online check without uploading your token.

Free online JWT generator with HS256 signature algorithm. Custom Header and Payload, quickly generate test tokens.

Free online TOTP verification code generator, similar to Google Authenticator, with multi-secret management.

Free online X.509 certificate decoder. Paste a PEM certificate to view Subject, Issuer, validity period, public key algorithm, fingerprint, and more.

Online secure password generator: customizable length, uppercase, lowercase, numbers, symbols. Uses crypto.getRandomValues for true randomness. Generated locally, never stored.

Free online password strength checker that evaluates password security, provides improvement suggestions, and estimates crack time.

Online API tester: GET/POST/PUT/DELETE/PATCH with custom Headers/Body, 30s timeout with cancel. Postman alternative.

Online HAR viewer: open .har files exported from browser DevTools — requests grouped by domain, seven-segment timing waterfalls, status distribution, slowest/largest request spotting. Fully local analysis, captures never leave your browser.

GET vs POST explained: safety, idempotency, caching, body semantics and when to use each HTTP method, with a complete request-method cheatsheet.

Complete HTTP status code reference: all 1xx/2xx/3xx/4xx/5xx codes with names, descriptions, and use cases. Searchable and filterable, links to MDN docs.

Free online URL parser tool that breaks down protocol/domain/path/params/hash with visual parameter editing and real-time two-way sync

Free online URL parameter parser. Quickly parse and edit URL query parameters with add/delete/edit support.

Free online User-Agent parser tool. One-click detection of browser, operating system, device type, vendor, model, and more. Supports bot/crawler detection, mobile/desktop identification, and all major browsers.

Online tool to check the pixel width of Title and Description meta tags. Simulates Google SERP preview to avoid truncation.

Online Open Graph previewer. Enter OG tag content and preview how your page looks when shared on Facebook, Twitter, and LinkedIn.

Free online sitemap generator. Enter a list of URLs and generate a standard XML sitemap with changefreq and priority options.

Free online robots.txt generator. Configure User-agent and Allow/Disallow rules to generate a standard robots.txt file.

Online IPv4 CIDR calculator: input IP/prefix (e.g., 192.168.1.0/24) to calculate network address, broadcast address, subnet mask, host range, and total hosts. Essential for network engineers.

Free online IP subnet calculator. Supports CIDR calculation, subnet division, network and broadcast address computation.

Online regex tester with support for g/i/m/s flags. Real-time match highlighting. Runs locally in your browser for fast regex debugging.

Free online regex explanation tool. Explains regex pattern segment by segment, helps understand and learn regular expressions.

Change ID photo background online: AI portrait cutout with one click (white/blue/red/gray and custom colors). Photos processed locally, never uploaded — perfect for job applications and official documents.

Resize ID photos to official specs online: 1-inch, 2-inch, passport and visa sizes with background change. Processed locally, never uploaded.

Arrange ID photos onto an A4 sheet for printing (8 one-inch or 2-inch photos). Generated locally in your browser.

Check ID photo compliance locally: size, aspect ratio, brightness and background uniformity against common ID/passport/visa requirements.

Convert HEIC/HEIF iPhone photos to JPG online. Batch conversion, quality control, processed locally in your browser — photos never leave your device.

Convert HEIC/HEIF iPhone photos to lossless PNG online. Batch conversion, processed locally in your browser — photos never leave your device.

Convert HEIC/HEIF iPhone photos to efficient WebP in your browser. Batch supported, no upload.

Convert WebP images to universally compatible JPG online. Batch conversion, quality control, processed locally in your browser.

Convert WebP images to lossless PNG online. Batch conversion, processed locally in your browser — images never leave your device.

Convert JPG/PNG images to WebP online: 25-35% smaller files, batch conversion, quality control — processed locally in your browser.

Convert PNG to WebP online while preserving transparency and cutting size. Batch conversion, processed locally.

Convert SVG vector graphics to PNG bitmaps online. Great for design handoff and compatibility, processed locally.

Convert multiple JPG/PNG images into a single PDF online. Reorder pages, one image per page, generated locally without upload.

Merge JPG photos into one PDF document online. One image per page, reorder freely, generated in your browser.

Convert PNG images into a PDF document. Batch and reorder supported, generated locally.

Merge multiple PDFs into one file online. Unlimited pages and files, processed locally in your browser — documents never leave your device.

Split PDFs by page range online: extract pages 1-10 or any chapter into a new PDF, processed locally without upload.

Convert PDF to JPG images online: every page rendered to high-quality JPG, zipped for download, fully local.

Compress PDFs online: scans and image-heavy files shrink 60-90% with adjustable quality. Local processing, no upload.

Online image to Base64 converter: drag & drop, paste, or upload an image to get a Base64 Data URI. Perfect for inline images and CSS.

Free online Base64 to image converter. Supports data URI format, one-click decode, preview and download.

Free online image stitcher: combine screenshots or photos into one long image, vertical or horizontal, with adjustable gap and background. Composited locally in your browser.

Free online image watermark: text watermark with 9-position placement, size/opacity/color controls, and anti-theft tiling mode. Photos never leave your device.

Online image compression tool: supports PNG, JPEG, WebP format conversion with adjustable quality and max width. Client-side processing, no upload to server.

Online image resizer: exact width/height, aspect lock, PNG/JPEG/WebP export with quality control. Local processing, never uploaded.

Online favicon generator: upload one image and get the full 16/32/48/180/192/512 set, optional circle crop, HTML snippet included. Generated locally.

Online Image Color Extractor: upload an image to automatically extract the dominant colors and generate an 8-color palette with HEX values. Supports drag-and-drop and paste. Essential for design inspiration. All processing is done locally.

Online QR code generator: enter URL or text to create a QR code instantly. Customizable size and error correction. Download as PNG. Generated locally in browser.

Free online QR code decoder: upload, drag & drop or paste an image to decode QR code content instantly. 100% local, your images never leave the browser.

Free online QR code design tool with custom colors, corner styles, dot patterns, and PNG/SVG download support.

Online color format converter: HEX to RGB, RGB to HEX, HSL conversion. Supports alpha channel (transparency). Essential tool for designers and frontend developers.

Online px to rem converter with custom root font-size and a common font-size quick table. A must-have for responsive layout work. Local computation.

Visual CSS box-shadow generator: sliders for offset/blur/spread/opacity, live preview, one-click copy. Custom colors and inset support.

Free online color scheme generator tool. Generate complementary, analogous, triadic and more color schemes based on a base color.

Free online color contrast checker tool that tests foreground-background contrast ratio, validates WCAG AA/AAA standards, and auto-suggests accessible colors

Free online CSS gradient generator. Supports linear, radial, and conic gradients with visual color stops, angle control, and live preview. Copy CSS instantly.

Online Color Blindness Simulator: input any color to simulate how it appears under Protanopia, Deuteranopia, Tritanopia, and other color vision deficiencies. Essential for accessible design. All processing is done locally.

Online Tailwind Color Finder: input any HEX color to match the closest Tailwind CSS palette values, showing color distance (ΔE) and class names. Essential for frontend color matching. All processing is done locally.

Online Unix timestamp converter: auto-detects seconds, milliseconds, microseconds. Supports Local, UTC, ISO 8601, and relative time. Essential for developers debugging timestamps.

Free online timezone converter: pick cities and see the equivalent time instantly, plus a live world-clock board. For meetings, travel, and distributed teams. Runs locally in your browser.

Online Cron expression parser: input a 5-field crontab entry (minute hour day month weekday) and get a human-readable schedule description. Supports step values, ranges, lists. Essential for scheduled task debugging.

Free online Cron expression generator. Visual selection of minute/hour/day/month/weekday with auto-generated expression and description.

Free online UUID generator: UUID v7 (time-sortable, index-friendly), v4, NanoID, and ULID in bulk, with version and timestamp parsing. Generated locally, never uploaded.

Free bulk UUID generator: create up to 10,000 v4 UUIDs in one click with hyphen/uppercase/JSON formatting. Copy or download instantly — generated locally, never uploaded.

Online Lorem Ipsum placeholder text generator: create paragraphs, sentences, or words with custom length. Essential for frontend development and UI design.