Your Swiss Army Knife for Dev
No sign-up, no tracking — just results.
Quick Access
JSON Format / Compress
Format, compress, and validate JSON online. Pretty-print with configurable indentation, minify to a single line, or parse JSON5. Your data never leaves the browser.
SQL Formatter
Format and minify SQL queries with syntax highlighting. Supports MySQL, PostgreSQL, Oracle, SQL Server and more. Free SQL beautifier, 100% in your browser.
Regex Tester
Test regular expressions in real-time with match highlighting, capture group inspection, and replacement preview. Built-in preset library and token-level explanation.
Text Diff
Compare two texts with line and word-level precision. Side-by-side or inline view with collapsible unchanged regions. Free diff checker, 100% in your browser.
Folder Diff
Compare two local folders and see which files were added, removed, or modified — with line-level diffs for changed text files. 100% in your browser, no upload.
Markdown Editor
Write and preview Markdown with GitHub Flavored Markdown support, syntax highlighting, Mermaid diagrams, and PDF/PNG export. Free editor, 100% in your browser.
Text Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, dot.case, Title Case and more — instantly and in bulk. Free tool, 100% in your browser.
Email / URL / Phone Extractor
Extract emails, URLs, and phone numbers from any text instantly, with deduplicated results and CSV, JSON, or TXT export. Free online extractor, 100% in your browser.
Word Counter
Count words, characters, sentences, and paragraphs, estimate reading and speaking time, and analyze keyword frequency and density for SEO. 100% in your browser.
Token Counter
Count OpenAI GPT tokens (o200k_base) with real-time BPE tokenization visualization. Supports GPT-4o, GPT-4.1, o1, o3, o4-mini, and GPT-5. Free, 100% in your browser.
Deduplicate Lines
Remove duplicate lines from text with options for case sensitivity, whitespace trimming, and empty line removal. Free deduplication tool, 100% in your browser.
Base64 Encode/Decode
Encode and decode Base64 strings with real-time bidirectional conversion, configurable charset, and Basic Authentication header support. No data leaves your browser.
URL Encoder/Decoder
Encode and decode URLs with Component, Whole URL, and Form modes, plus a reserved-character reference table. Free URL encoder/decoder, 100% in your browser.
JSON / TypeScript
Convert JSON or JSON5 to TypeScript interfaces and types. Supports nested objects, union types, and array merging. Free generator, 100% in your browser.
JSON / CSV Converter
Convert between JSON and CSV formats with support for nested objects and custom delimiters, plus a tabular data preview. Free online converter, 100% in your browser.
CSV / Markdown Table
Convert between CSV and Markdown Table formats with real-time bidirectional conversion. Adjust column alignment, delimiters, and layout — free, 100% in your browser.
Number Base Converter
Convert numbers between binary, octal, decimal, and hexadecimal with real-time sync. Supports 8/16/32/64-bit two's complement and a visual bit editor.
JSON / YAML Converter
Convert between JSON and YAML formats with full YAML 1.2 support: multi-document YAML, anchors, and aliases. Ideal for Kubernetes and CI/CD configs — free.
Storage Unit Conversion
Convert between bytes, KB, MB, GB, TB, PB and more with instant results. Supports both SI (decimal) and IEC (binary) standards — ideal for capacity planning.
CSS Unit Converter
Convert between CSS units (px, rem, em, vw, vh) with customizable base values. Batch convert CSS code blocks or check the reference table — free and in-browser.
JWT
Encode, decode, and verify JSON Web Tokens (JWT) with HS256, RS256, ES256, PS256 and more algorithms. Free online JWT debugger — tokens never leave your browser.
Text Hashing
Generate MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA3, Keccak, and RIPEMD-160 hashes with HMAC support. Free online hash calculator, 100% in your browser.
Password Generator
Generate cryptographically secure passwords with customizable length and characters, and check strength instantly with real-time analysis. Free, 100% in-browser.
SSH Key Generator
Generate SSH key pairs (RSA, Ed25519) in your browser with passphrase encryption, fingerprint display, and public key inspection. Keys never leave your device.
HD Wallet
Generate BIP39 mnemonic phrases and derive cryptocurrency addresses for EVM, Bitcoin, Solana, Tron, and Cosmos chains. Free online HD wallet tool — 100% client-side.
Text Encrypt/Decrypt
Encrypt and decrypt text using AES, DES, Triple DES, Rabbit, RC4, and RC4Drop with configurable block modes. Free online tool — text never leaves your browser.
File Checksum
Calculate MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA3, and RIPEMD-160 checksums for any file with no size limit — fast, free, and 100% in your browser.
UUID Generator
Generate v1/v3/v4/v5/v7 UUIDs conforming to RFC 4122/9562. Supports bulk generation and multiple output formats. Free, 100% local — no tracking, no data sent.
Cron
Build and decode Cron expressions for Standard, Spring, and Quartz schedulers. See human-readable explanations and preview the next 5 execution times.
Unix Timestamp
Convert between Unix timestamps and readable dates with a live clock. Supports seconds and milliseconds, showing Local and UTC side-by-side. 100% in your browser.
QR Code Generator
Generate styled QR codes for text, URLs, WiFi, vCard, email, and SMS with custom colors, logos, and dot styles. Export as SVG or PNG — free, 100% in your browser.
Color Converter
Convert HEX, RGB, HSL, HSV, CMYK, LAB, OKLCH. Visual picker with eyedropper, palette generator, image color extraction, WCAG + APCA contrast, and color-blindness preview.
Image Resizer
Resize images by percentage or custom dimensions for social posts, web assets, and email. Supports PNG, JPG, WebP input. All processing runs in your browser.
Image Compressor
Compress images with adjustable quality and a drag-to-compare preview. Supports PNG, JPG, and WebP. Free online compressor — images never leave your browser.
Image Converter
Convert images between PNG, JPG, and WebP formats in seconds. Free online image converter — all processing runs locally in your browser, no upload required.
Image Watermark
Add text or logo watermarks to images. Customize position, opacity, rotation, and tiling. Supports PNG, JPG, WebP. All processing runs in your browser.
Image Cropper
Crop images with free selection, preset aspect ratios, or exact pixel dimensions. Supports PNG, JPG, and WebP. Free online cropper — images never leave your browser.
Image Rotate
Rotate images by 90°, 180°, or 270° and flip them horizontally or vertically. Supports PNG, JPG, and WebP. Free online rotate tool — images never leave your browser.
Images to PDF
Convert JPG, PNG, WebP, and GIF images into a single PDF with multiple layout modes, page sizes, and margins. Free converter — images never leave your browser.
PDF to Image
Convert PDF pages to PNG, JPG, or WebP images with DPI control. Select pages, adjust quality, download individually or as ZIP. All processing runs in your browser.
PDF Merger
Merge multiple PDF files into a single document with drag-and-drop reordering, thumbnail preview, and instant download. Free — PDFs never leave your browser.
PDF Split
Split a PDF into separate pages, custom ranges, or hand-picked selections with thumbnail preview and ZIP download. Free tool — PDFs never leave your browser.
PDF Compressor
Compress PDF files with adjustable quality to reduce file size while maintaining readability. Free online PDF compressor — files never leave your browser, no signup.
PDF Watermark
Add text or image watermarks to PDF files, customizing font, color, opacity, rotation, and tiling. Free online tool — PDFs never leave your browser, no signup.
HTTP Status
Complete HTTP status code reference with descriptions, RFC references, and usage guides. Covers all IANA-registered codes plus common unofficial codes.
HTTP Client
Send HTTP requests and test REST APIs directly in your browser. Supports GET, POST, PUT, DELETE with custom headers, request body, and authentication.
DB Viewer
Open SQLite databases: browse schema, run read-only SQL with autocomplete, paginate large result sets, and export to CSV or JSON. Files never leave your device.
ASCII Table
Complete ASCII character table with decimal, hex, octal, and HTML codes for all 128 characters. Interactive reference with instant search and filtering.
HTML Code
Encode and decode HTML special characters and entities in your browser. Full reference table with named, decimal, and hex entity codes — searchable and free to use.
BIP39 Word List
BIP39 mnemonic word list reference with all 2048 words in the standard English list, searchable by index or substring. Free lookup tool, 100% in your browser.
Subnet Calculator
IPv4/IPv6 CIDR calculator with subnet splitter and VLSM allocator. Compute network address, broadcast, host range, and subnet mask — 100% client-side.
Recipe
Chain multiple operations into a reusable recipe, composing text and image processing steps CyberChef-style. Free workflow tool — all data stays in your browser.
Batch Processor
Apply a single operation to multiple inputs at once: batch encode, hash, compress, and convert files and text. Free batch processor, 100% in your browser.
53+ free developer tools
OmniKit is a collection of 53+ free, browser-based developer tools — all processing happens locally in your browser. No sign-up, no tracking, no data ever leaves your device. Tools include a JSON formatter and validator, Base64 encoder and decoder, JWT debugger with signature verification, regex tester with real-time matching, QR code generator with logo support, hash calculator supporting MD5 through SHA-512 and beyond, encryption and decryption for AES and other ciphers, UUID generator, cron expression builder, text diff viewer, and many more. Private by design and free forever.
Why OmniKit?
Privacy First
All processing happens in your browser. No data is ever sent to any server.
No Installation
No download or setup — open in your browser and start using
Free Forever
No sign-up, no tracking, no premium tiers.
Explore by Category
Text Processing
Format, transform, and analyze text and code with tools for JSON, regex, diff, and more.
Encoding & Conversion
Convert between encodings and formats — Base64, URL encoding, number bases, YAML, CSV.
Security & Crypto
Encrypt, hash, and secure your data with JWT, hashing, cipher, SSH key, and password tools.
Generators
Generate UUIDs, QR codes, cron expressions, and timestamps.
Visual & Media
Work with colors, images, and visual content.
Reference & Lookup
Look up ASCII codes, HTTP status codes, HTML entities, and more.
Workflows
Chain multiple operations into data processing pipelines and recipes.