Developer Tools
Handy utilities for developers and programmers
Select a tool below. Every tool runs locally in your browser and is free to use.
💻 Developer Tools · Total 42 tools
AES Encrypt / DecryptAES encrypt decrypt tool: support AES encryption and decryption with key and IV for development and security, with one-click copy, offline and multilingual.
Caesar CipherCaesar cipher tool: encrypt and decrypt with any shift 1-25, letters only with case preserved for learning, one-click copy and offline.
Code128 Barcode GeneratorCode128 barcode generator: support ASCII charset with automatic checksum generating standard barcode SVG for products and logistics, with one-click copy and offline.
เครื่องมือจัดรูปแบบ CookieCookie formatter: parses Cookie strings to JSON/table with URL decoding and rebuilds Cookies from JSON. For debugging. Supports batch processing and one-click copy.
CRC32 / Adler-32 ChecksumChecksum calculator: support CRC32 and Adler-32 algorithms outputting hex and decimal results for file and data verification, with one-click copy and offline.
Cron Expression ParserCron parser: parse 5-field cron expressions into readable descriptions and next run times for scheduling, with one-click copy and offline.
CSS Formatter & MinifierCSS formatter and minifier: beautify or minify CSS with one click, removing comments while keeping syntax valid for frontend, with one-click copy and offline.
CSV to Markdown TableCSV to Markdown: converts CSV to Markdown tables with comma/semicolon/Tab and quote handling. Supports batch processing, export and one-click copy, offline use.
Download Time CalculatorDownload time estimator: calculate download time from file size and connection speed for downloads, with one-click copy and offline.
.env Formatter.env formatter: parse KEY=VALUE and align, trim and escape or convert to JSON for config and deployment, with one-click copy and offline.
.gitignore GeneratorGitignore generator: select Node, Python, Java, Go, Vue etc to generate .gitignore with custom merge. Supports batch processing, export and one-click copy.
เครื่องมือบีบอัด/แตกไฟล์ GzipGzip compress tool: compress text to Base64-encoded Gzip or decompress back for transfer and storage, with one-click copy and offline.
HMAC-SHA256 GeneratorHMAC generator: enter message and secret to generate HMAC-SHA256 hex and Base64 signatures. For API signing. Supports batch processing, export and one-click copy.
เข้ารหัส/ถอดรหัส HTML และแปลงเป็น JSHTML escape and decode tool: support special character escape, entity decode and deep numeric encoding for web and security, with one-click copy and offline.
HTML Table GeneratorHTML table generator: paste CSV data to generate HTML table code with header, border and class settings and preview for development, with one-click copy and offline.
HTML to MarkdownHTML to Markdown converter: convert HTML to Markdown with headings and links for docs and writing, with one-click copy and offline.
ค้นหาสถานะ HTTPHTTP status codes reference: look up 1xx-5xx meanings, scenarios and troubleshooting with all common codes for development and ops, with one-click copy and offline.
Interview Question GeneratorInterview question generator: create random interview questions and answers by role and difficulty for job prep and interviewers.
IP Subnet CalculatorIP subnet calculator: calculate network address and broadcast from IPv4 and prefix for networking, with one-click copy and offline.
IPv6 Expand & CompressIPv6 expander: expand compressed addresses to full 8 groups or compress back with validation for networking and ops, with one-click copy and offline.
JavaScript Formatter & MinifierJavaScript formatter: beautify indentation, minify size and safely handle strings and comments with custom indent for development, with one-click copy and offline.
JSON FlattenerJSON flattener: expand nested JSON into dot-path key-value pairs with array indexes and custom separators for config and APIs, with one-click copy and offline.
JSON to CSVJSON to CSV converter: convert JSON array to CSV with custom delimiters and header export for data processing, one-click copy, offline and multilingual.
JSON to TypeScriptJSON to TypeScript: converts JSON to TypeScript interfaces with nested support. For frontend. Supports batch processing, export and one-click copy, offline use.
JSON to YAMLJSON to YAML converter: convert JSON objects to YAML format with nesting and arrays for config and development, with one-click copy and offline.
JSON Tree ViewerJSON tree viewer: render JSON as collapsible color-coded tree with expand and collapse for deep data for APIs, with one-click copy and offline.
JWT Encoder (HS256)JWT encoder: inputs header, payload and secret to generate HS256 JWT token. Supports batch processing, export and one-click copy, offline use.
MAC Address GeneratorMAC address generator: generate random MAC addresses in bulk with multiple formats for networking, with one-click copy and offline.
Markdown Table GeneratorMarkdown table generator: visually edit rows and columns to generate table code with header and alignment for docs and README, with one-click copy and offline.
Markdown to HTMLMarkdown to HTML converter: support headings, bold, italic, links, lists and code blocks with live preview for writing and docs, with one-click copy and offline.
Markdown TOC GeneratorMarkdown TOC generator: extract headings to generate anchored table of contents with nesting for docs, with one-click copy and offline.
เครื่องคำนวณการเข้ารหัส/แฮช MD5MD5 hash tool: compute 32-char hex MD5 digest for UTF-8 text locally for privacy for verification and learning, with one-click copy and offline.
MIME Type LookupMIME lookup: enter file extension or MIME to get Content-Type with common types. Supports batch processing, export and one-click copy, offline use.
Random IP & Port GeneratorRandom IP and port generator: generate random public IPv4 with port and validate IP:port format for network testing, with one-click copy and offline.
SQL FormatterSQL formatter: beautify SQL with keyword uppercasing and indentation for multiple dialects and debugging, one-click copy and offline.
หนีตัวอักษร/เลิกหนีตัวอักษร (JS)String escape tool: convert strings to JavaScript escaped form handling quotes and newlines for coding, with one-click copy and offline.
เข้ารหัส/ถอดรหัส Unicode (ขึ้นต้นด้วย \u)Unicode converter: convert Chinese, Emoji and text to \uXXXX escapes or restore with bulk and large text for development, with one-click copy and offline.
User-Agent ParserUser-Agent parser: paste UA string to identify browser, version, OS and device with highlighting for development and analytics, with one-click copy and offline.
เข้ารหัส/ถอดรหัส UTF-16 (ขึ้นต้นด้วย \x)UTF-16 converter: convert text to \xXXXX hex escapes or decode back supporting bulk and large text for development and debugging, with one-click copy and offline.
XML to JSONXML to JSON converter: convert XML to JSON handling attributes and nesting with validation for development, with one-click copy and offline.
YAML FormatterYAML formatter: parse and reformat YAML with clean indentation and quoting for clear output for config and learning, with one-click copy and offline.
YAML to JSON ConverterYAML to JSON converter: support indent-nested maps and scalars converting to formatted JSON for config, with one-click copy and offline.
FAQ
What is the Developer Tools category?
The Developer Tools category includes 42 free online tools for common needs. All run locally in your browser - no sign-up or install required.
Are these tools free?
Yes, all tools are free with no usage limits.
Do I need to register?
No. Open a page and use it right away - your data stays in your browser.
Which languages are supported?
This site supports 12 languages: Chinese, English, Japanese, Korean, Spanish, French, German, Portuguese, Russian, Arabic, Indonesian and Hindi.