Practical tools for real technical workflows.
Debug APIs, clean content, format data, and run release checks directly in your browser.
JSON Formatter
Format, validate, auto-fix & inspect JSON paths
Base64
Encode & decode Base64
MD5 Generator
Generate MD5 hash
URL Encode / Decode
Encode/decode URL parameters and full URLs safely
Timestamp Converter
Convert Unix timestamps
UUID Generator
Generate UUIDs / GUIDs
Password Generator
Generate policy-ready strong passwords for user and system accounts
Word Count Checker
Free online word count checker for words, characters, and reading time
HTML Encode / Decode
Encode & decode HTML entities
Case Converter
Convert text case formats
QR Code Generator
Generate QR codes online
Lorem Ipsum Generator
Generate placeholder text
Number Base Converter
Convert between binary, octal, decimal & hex
Hash Generator
Generate SHA-1, SHA-256 & SHA-512 hashes
Text Diff
Compare two texts and highlight differences
JWT Decoder
Decode & inspect JWT tokens
Color Converter
Convert between HEX, RGB, HSL, HSV & CMYK
YAML ↔ JSON
Convert between YAML and JSON
Regex Tester
Test regular expressions with live match highlighting
Crontab Generator
Build cron expressions with human-readable preview
JSON ↔ CSV
Convert between JSON arrays and CSV
JSON to Excel
Convert JSON objects and arrays to XLSX
Bcrypt
Hash and verify passwords with bcrypt
Markdown → HTML
Convert Markdown to HTML with live preview
chmod Calculator
Convert chmod numeric and symbolic permissions
IPv4 Subnet Calculator
Calculate subnet, hosts, CIDR and binary details
SQL Formatter
Format and beautify SQL queries instantly
HMAC Generator
Generate HMAC-SHA1, SHA256, SHA512 online
Token Generator
Generate secure random tokens online
URL Parser
Parse, clean, and export URL parts
XML Formatter
Format and minify XML online
Image to Base64
Convert images to Base64 data URLs
JSON to TypeScript
Generate TypeScript interfaces from JSON
Text to Binary
Convert text to binary, hex, octal & decimal
CSS Unit Converter
Convert px, rem, em, vw, vh and more
Markdown Preview
Live Markdown to HTML preview
Number to Words
Convert numbers to English words & more
ASCII Art Generator
Convert text to ASCII art
HTTP Status Codes
Reference for all HTTP status codes
MIME Type List & Content-Type Reference
Find MIME types by extension (png, jpg, mp3, pdf, json) with copy-ready output
Roman Numeral Converter
Convert between numbers and Roman numerals
JSON Minifier
Minify JSON and reduce payload size
HTML Minifier
Minify HTML and remove unnecessary bytes
CSS Minifier
Compress CSS for faster page loads
Slug Generator
Generate clean SEO-friendly URL slugs
cURL to Fetch
Convert cURL commands to JavaScript fetch
XML to JSON
Convert XML into structured JSON
JWT Generator
Generate signed JWT tokens (HS256/none)
SQL Minifier
Compress SQL queries to one line
User-Agent Parser
Parse browser, OS, device from UA string
HTTP Headers Parser (Raw Header to JSON)
Parse raw HTTP request/response headers into structured JSON
JSON Schema Validator
Validate JSON data against JSON Schema
JWT Verifier
Verify JWT signature and inspect claims
JSON Diff
Compare two JSON objects with path-level changes
Query String Parser
Convert query strings and JSON objects both ways
Delimiter Converter
Convert CSV, TSV, Pipe, and Semicolon formats
UTM Builder
Build tracked URLs with UTM parameters
Meta Tag Generator
Generate SEO and Open Graph meta tags
Robots.txt Generator
Generate robots.txt rules for crawlers
Sitemap Generator
Generate sitemap.xml from URL lists
SemVer Tools
Compare versions and suggest bumps
CSP Generator
Generate Content Security Policy headers
Markdown Table Generator
Convert CSV/TSV data to Markdown tables
Regex Replacer
Find and replace text using regular expressions
HTTP Header Generator
Generate HTTP request header blocks
Redirect Rule Generator
Generate Nginx and Apache redirect rules
Gitignore Generator
Generate .gitignore from common templates
DNS Record Generator
Generate A, AAAA, CNAME, TXT and MX records
Email Header Parser
Parse raw email headers into structured fields
Changelog Generator
Generate structured changelog entries
Color Palette Generator
Generate palettes from a base color
FAQ Schema Generator
Generate FAQPage JSON-LD structured data
Breadcrumb Schema Generator
Create BreadcrumbList JSON-LD markup
Organization Schema Generator
Generate Organization JSON-LD markup
Hreflang Generator
Generate hreflang alternate link tags
Meta Robots Generator
Generate robots meta tag directives
UUID Validator
Validate UUID format/version in bulk for API payload and DB QA
Email Validator
Validate email address format
SRI Hash Generator
Generate SHA256/384/512 integrity hashes
JSONL Converter
Convert JSON array and JSON Lines
Line Sorter
Sort text lines with options
IBAN Validator
Validate IBAN account numbers
Credit Card Validator
Validate card number with Luhn check
Email Extractor
Extract email addresses from text
URL Extractor
Extract links from text content
HTML to Text
Convert HTML markup to plain text
IPv6 Validator
Validate and normalize IPv6 addresses in bulk
Domain Extractor
Extract domains from text and URLs
Regex Escape
Escape and unescape regex special chars
Unicode Escape Converter
Convert text and unicode escapes
Markdown Link Extractor
Extract Markdown links, anchors, and destinations for SEO/content audits
Color Contrast Checker
Check WCAG contrast ratio
Markdown TOC Generator
Generate table of contents from headings
JSON Key Extractor
Extract key paths from JSON
HTML Link Extractor
Extract href links from HTML
URL Canonicalizer
Normalize URLs and remove tracking params
CSS Specificity Calculator
Calculate selector specificity score
JSON Sorter
Sort JSON keys recursively
Keyword Density Checker
Analyze keyword frequency and density
HTML Table to CSV
Convert HTML tables into CSV
Password Strength Checker
Check password score, patterns, and entropy locally
Emoji Remover
Remove emojis from text
Whitespace Cleaner
Normalize spaces and line breaks
Base32 Encode / Decode
Encode and decode Base32 text
ULID Generator
Generate sortable ULIDs for logs, event streams, and distributed systems
NanoID Generator
Generate short random IDs
UUID v7 Generator
Generate sortable UUID v7 IDs
Timezone Converter
Convert time across global timezones
JSON Flatten / Unflatten
Convert nested JSON to flat key paths
CIDR Range Converter
Convert CIDR blocks and IP ranges
Base58 Encode / Decode
Convert text and Base58 strings
AES Encrypt / Decrypt
Encrypt and decrypt text with AES-GCM
TOTP Generator
Generate time-based one-time passwords
Cron Parser
Parse cron expressions and preview next runs
JSON Path Extractor
Extract JSON values with path expressions
XPath Tester
Run XPath queries on XML or HTML
Byte Size Converter
Convert between byte storage units
Duration Converter
Convert durations across time units
IPv4 Integer Converter
Convert IPv4 addresses and 32-bit integers
CIDR Subnet Splitter
Split a CIDR block into smaller subnets
MAC Address Generator
Generate random MAC addresses with format control
Snowflake ID Parser
Decode and generate Snowflake IDs
ULID Parser
Parse ULID timestamp and randomness
Base62 Encoder Decoder
Encode and decode Base62 strings
CSV Column Extractor
Extract selected columns from CSV data
DNS Zone Parser
Parse BIND zone files into structured records
CIDR Merger
Merge overlapping and adjacent CIDR blocks
HTTPie to cURL Converter
Convert HTTPie commands to cURL
Sitemap Validator
Validate sitemap.xml and sitemap index files
Meta Tag Analyzer
Analyze SEO meta tags in HTML
IP Port Extractor
Extract IPv4 and IPv6 endpoints from text
Date Difference Calculator
Calculate exact and calendar date differences
SQL Insert Generator
Generate SQL INSERT statements from CSV rows
JSON FormData Converter
Convert nested JSON to FormData fields
HTTP Request Builder
Build cURL and fetch requests from structured inputs
Robots.txt Validator
Validate robots directives and detect common SEO mistakes
Basic Auth Generator
Generate HTTP Basic Authorization header from credentials
INI to JSON
Convert INI config files to clean JSON with type parsing
JSON Line Counter
Count JSONL records and detect invalid rows quickly
URL Slug Checker
Audit slug quality and generate SEO-safe slug suggestions
URL Query Cleaner
Clean tracking params and normalize URL query strings
Content-Type Parser (MIME, Charset, Boundary)
Parse Content-Type headers and extract MIME parameters
Content-Type Generator (MIME Header Builder)
Generate valid Content-Type headers with charset and boundary
Data URL Parser
Parse data: URLs and preview decoded payload content
Set-Cookie Parser
Parse Set-Cookie headers into name, value, flags, and attributes
Cache-Control Parser
Parse Cache-Control directives and inspect TTL and conflicts
CORS Header Generator
Generate Access-Control-* headers for API and preflight responses
Duplicate PDF Pages
Duplicate selected PDF pages and append them to the end
Repeat Entire PDF
Duplicate the entire PDF document 2-20 times in one file
Normalize PDF Rotation
Reset page rotation metadata to 0° (all, odd, or even pages)
Split Odd and Even Pages
Split a PDF into two files: odd pages and even pages
PDF Info Inspector
Inspect PDF metadata, page count, page sizes and orientation
Split PDF Pages
Split a PDF by single page, fixed group size, or custom ranges
Add PDF Watermark
Add a text watermark with custom font size, opacity, rotation and color
Add Header & Footer to PDF
Add page-level header and footer with {page} placeholder support
Insert Blank Pages into PDF
Insert a blank page every N pages, with optional pad-to-even mode
Remove Pages from PDF
Delete pages from a PDF using ranges like 1,3,5-8
Extract Pages from PDF
Extract specific pages from a PDF using ranges like 1,3,5-8
Rotate Even/Odd PDF Pages
Rotate even, odd, or all PDF pages by 90°, 180° or 270°
Extract PDF Pages as Images
Render PDF pages to PNG or JPEG at 1x, 2x or 3x scale
Merge PDF Files
Combine multiple PDFs into one in your chosen order
Merge Odd and Even PDF Pages
Interleave odd-page and even-page scan PDFs into the original order
Reverse PDF Page Order
Reverse every PDF page or only a continuous page range
MAC Address Validator and Formatter
Validate and convert MAC addresses between common notations
IP in CIDR Checker
Check IPv4 and IPv6 addresses against multiple CIDR blocks
TOTP QR Code Generator
Create an otpauth setup QR code and verify it with a live TOTP
Microsoft Safe Links Decoder
Reveal the original destination wrapped by Outlook and Microsoft 365 Safe Links
QR Code Decoder from Image
Read QR content from an uploaded, dropped, or pasted image
HAR File Viewer and Analyzer
Open HTTP Archive files and inspect requests, errors, sizes and timings
IPv6 Subnet Calculator
Calculate IPv6 CIDR ranges, address counts and child subnet previews
Remove PDF Metadata
Inspect and remove PDF document properties and XMP metadata locally
Basic Auth Decoder
Decode an Authorization Basic header into username and password fields
Proofpoint URL Decoder
Reveal original destinations wrapped by Proofpoint URL Defense v2 and v3
Excel to JSON Converter
Read XLS or XLSX worksheets and export typed rows as JSON
JSON to SQL Converter
Generate MySQL, PostgreSQL or SQLite INSERT statements from JSON
OAuth PKCE Generator
Generate RFC 7636 verifier, S256 challenge and authorization parameters
AWS Presigned URL Inspector
Inspect SigV4 credential scope, signed headers and expiration without requesting the URL
SAML Decoder
Decode SAML requests and responses from Base64 or HTTP-Redirect payloads
X.509 Certificate Decoder
Inspect PEM or DER certificate identity, SANs, validity, usage, and fingerprint
CSV Viewer
Open, filter, sort, hide columns, and export CSV or TSV data locally
JSON Schema Generator
Infer Draft 2020-12 or Draft 7 schemas from sample JSON values
PDF Page Organizer
Reorder PDF pages with thumbnails, drag and drop, then export a new file
Images to PDF Converter
Combine ordered JPG, PNG, or WebP images into a configurable PDF
Image Metadata Viewer & Remover
Inspect EXIF and GPS fields, then re-encode a clean JPG, PNG, or WebP
SVG Optimizer
Clean and compress SVG markup with SVGO, preview it, and compare bytes
Flatten PDF
Flatten AcroForm fields and optionally rasterize visible annotations
PDF Booklet Maker
Impose pages in duplex booklet order with blanks, paper, gutter, and direction controls
Crop PDF Pages
Set a visual CropBox on selected PDF pages with a live margin preview
Extract Text from PDF
Extract the selectable PDF text layer by page as TXT or JSON
Remove PDF Annotations
Remove links, comments, highlights, drawings, and optional form widgets
N-up PDF
Place 2, 4, or 6 PDF pages on each A4 or Letter sheet
IPv6 Range to CIDR Converter
Convert IPv6 start and end addresses to a minimal CIDR set, or expand a CIDR range
IPv6 Reverse DNS Generator
Generate ip6.arpa PTR owners, reverse zones, and a BIND snippet
CIDR Exclude Calculator
Subtract IPv4 or IPv6 subnets from a parent CIDR and return the minimal remainder
Wildcard Mask Calculator
Convert an IPv4 CIDR or subnet mask into a Cisco ACL wildcard and examples
CSR Decoder
Decode PKCS#10 CSR subject, SANs, public key, signature, and fingerprints
PEM to JWK Converter
Convert RSA or EC SPKI public keys between PEM and JWK with an RFC 7638 thumbprint
SSH Key Fingerprint
Calculate SHA256 and legacy MD5 fingerprints from an OpenSSH public key
Password Hash Identifier
Identify bcrypt, Argon2, scrypt, PBKDF2, Unix crypt, LDAP, and legacy hash formats
AWS ARN Parser
Parse AWS ARN partition, service, region, account, resource type, ID, and qualifier
XLSX Viewer
Open XLS/XLSX workbooks locally with multi-sheet preview, filter, sort, copy, and CSV export
TOML to JSON Converter
Convert and validate TOML and JSON in both directions with nested tables and arrays
JSON Escape & Unescape
Escape raw text as a JSON string or decode strict and nested JSON string literals
JSON to Go Struct
Infer nested Go structs, JSON tags, slices, pointers, and optional fields from samples
JSON to Java Class
Generate Java records or POJO classes with nested models and optional Jackson annotations
JSON to Rust Struct
Generate nested Rust structs with Serde derives, rename attributes, Vec, and Option fields
JSON to Kotlin Data Class
Generate nested Kotlin data classes with nullable defaults and kotlinx or Jackson annotations
GraphQL Formatter
Parse, format, or minify GraphQL operations and summarize variables and fragments
File Type Detector
Compare file magic bytes, filename extension, browser MIME, and text-content hints locally
.env to JSON Converter
Convert dotenv variables and JSON in both directions with type inference and nested-key flattening
JSON to C# Class Generator
Infer C# records or classes with nested models, nullable types, and JSON serializer attributes
XML to CSV Converter
Extract repeated XML elements into CSV rows with attribute mapping and a table preview
CSV to XML Converter
Turn CSV rows into configurable XML elements with optional @-prefixed attributes
JSON to XML Converter
Convert JSON objects and arrays to XML with configurable roots, attributes, and text nodes
Barcode Generator
Generate Code 128, EAN-13, UPC-A, Code 39, ITF-14, and Codabar as SVG or PNG
Barcode Decoder from Image
Read common one-dimensional barcodes from local PNG, JPEG, or WebP images with ZXing
SVG to PNG Converter
Render sanitized SVG markup to PNG with custom dimensions, scale, and transparent or solid background
Batch Image Resizer
Resize PNG, JPEG, WebP, or AVIF images by width, percentage, or long edge and download a ZIP
Image Format Converter
Convert PNG, JPEG, WebP, and AVIF locally with quality and before-after byte comparisons
Favicon Generator
Create 16-512 px PNG icons, a multi-size favicon.ico, Web Manifest, and ZIP from text or an image
Image Color Picker
Inspect exact image pixels with a magnifier and export HEX, RGB, HSL, alpha, and coordinates
Cookie Header Parser
Parse a client Cookie request header into named values, detect duplicates, decode percent escapes, and export JSON
Content-Disposition Parser & Generator
Parse or generate inline and attachment headers with filename and RFC 5987 filename* support
CSP Header Analyzer
Parse an existing Content-Security-Policy and flag wildcard, unsafe, insecure, duplicate, and missing controls
Redirect Map Validator
Audit CSV source-to-target maps for duplicate sources, loops, chains, self-redirects, and trailing-slash conflicts
PDF Attachment Extractor
Extract files stored in a PDF's EmbeddedFiles attachment tree
PDF Form Field Inspector
Inspect AcroForm fields, types, values, required and read-only status
PDF Grayscale Converter
Convert color PDF to grayscale for printing
PDF Text Comparator
Compare text content of two PDFs page by page
MAC Vendor Lookup
Look up manufacturer by MAC address OUI
IP Address Anonymizer
Mask IP addresses in logs (IPv4/IPv6)
OpenAPI Validator
Validate OpenAPI 3.0/3.1 YAML/JSON and locate errors
Docker Compose Validator
Validate Docker Compose YAML, services, resource references, and dependencies
Image Compressor
Compress PNG, JPEG, WebP, and AVIF images to a target size
PDF Compressor
Reduce PDF size with safe cleanup or scanned-document compression
PDF OCR
Recognize text in scanned PDFs and export TXT, JSON, or searchable PDF
Image to Text OCR
Extract editable text from screenshots, receipts, and photos
Sign PDF
Add a hand-drawn, typed, or uploaded visual signature to a PDF
CSV to Excel
Convert CSV or TSV into a real XLSX workbook with typed cells
Markdown to PDF
Render Markdown headings, lists, tables, and code into a PDF
DMARC Checker
Check DMARC, SPF, and an optional DKIM selector over DNS
Recently Updated Tools
Fresh additions and improvementsDMARC Checker
Check DMARC, SPF, and an optional DKIM selector over DNS
Markdown to PDF
Render Markdown headings, lists, tables, and code into a PDF
CSV to Excel
Convert CSV or TSV into a real XLSX workbook with typed cells
Sign PDF
Add a hand-drawn, typed, or uploaded visual signature to a PDF
Image to Text OCR
Extract editable text from screenshots, receipts, and photos
PDF OCR
Recognize text in scanned PDFs and export TXT, JSON, or searchable PDF
PDF Compressor
Reduce PDF size with safe cleanup or scanned-document compression
Image Compressor
Compress PNG, JPEG, WebP, and AVIF images to a target size
Docker Compose Validator
Validate Docker Compose YAML, services, resource references, and dependencies
OpenAPI Validator
Validate OpenAPI 3.0/3.1 YAML/JSON and locate errors
IP Address Anonymizer
Mask IP addresses in logs (IPv4/IPv6)
MAC Vendor Lookup
Look up manufacturer by MAC address OUI
Practical Guides
Step-by-step workflows that combine multiple tools to solve real tasks.API Debugging Checklist: From Broken Response to Root Cause
A practical debugging flow for API payload errors, auth failures, and malformed responses.
Slug and URL SEO Basics for Real Production Pages
Build cleaner URLs, avoid duplicate paths, and keep share links stable.
Password and Token Security Hygiene for Small Teams
A no-nonsense workflow for generating safer secrets, validating password strength, and locking down token hygiene before release — covers policy presets, hash vs HMAC boundaries, rotation drills, and pre-launch leak rehearsals, with practical examples teams can drop into docs and review pipelines.
Document Handoff Workflow for Real Client and Review Delivery
Use small support tools around a document workflow so secure sharing, OCR review, and messy exports feel less fragile.
Content SEO Quick Audit Before You Publish
A lightweight checklist to catch technical and on-page SEO misses in minutes.
Start Here
If this is your first visit, start with these high-frequency tools to understand the core workflow quickly.
Popular Workflows
Not just isolated utilities: these guides connect tools into real troubleshooting and release workflows.
Why It Is Trustworthy
Core tools run locally by default, pages are reviewed on a cadence, and policy/feedback pages are publicly accessible.
- Core tool pages are reviewed for result and guidance quality
- Cross-language consistency checks for EN and ZH content
- Editorial policy, privacy notes, and issue-report channel are available