Separate odd and even PDF pages
Split a source into two downloads. Use the numbered sample to check page order and odd-page counts.
URL checks · PDF printing · developer tools⌘Kquick search
Practical tools for real technical workflows.
Debug APIs, clean content, format data, and run release checks directly in your browser.
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Start with a task
Understand a URL before cleaning it
Compare raw and decoded parameters, repeated keys, spaces and plus signs before removing tracking fields.
Follow the examplePut several PDF copies in one file
Repeat the entire page sequence and compare it with printer copies and selected-page duplication.
Follow the exampleJSON Formatter
Format, validate, auto-fix & inspect JSON paths
Base64
Encode text or file bytes; decode Base64 text
MD5 Generator
Calculate MD5 for exact text or file bytes
URL Encode / Decode
Compare percent encodings and control decoding layers
Timestamp Converter
Convert signed Unix seconds or milliseconds and strict ISO dates
UUID Generator
Generate UUID v4 and v1 batches
Password Generator
Generate random passwords with a chosen length and character pool
Word & Character Counter
Count whitespace tokens, Unicode code points, sentences and paragraphs
HTML Entity Encoder & Decoder
Encode five special characters or decode HTML entities one layer
Case Converter
Convert one name into 11 case styles
QR Code Generator
Generate a static QR PNG and verify its encoded text
Lorem Ipsum Generator
Generate placeholder text
Number Base Converter
Convert between binary, octal, decimal & hex
Hash Generator
Hash UTF-8 text with SHA-1, SHA-256 & SHA-512
Text Diff
Compare exact lines and copy a diff report
JWT Decoder
Read JWT claims and time fields without signature verification
Color Converter
Convert opaque CSS colors to HEX, RGB, HSL, HSV and CMYK
YAML ↔ JSON
Convert between YAML and JSON
Regex Tester
Test JavaScript regex matches and inspect indices
Crontab Generator
Build numeric five-field cron expressions
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
Inspect URL structure and raw query fields
XML Formatter
Serialize XML 1.0 with preserved text, namespaces and optional layout changes
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
Read decimals in English and format Chinese financial amounts
ASCII Art Generator
Convert text to ASCII art
HTTP Status Codes
Search common HTTP status codes
MIME Type List & Content-Type Reference
Look up reference MIME values by extension or media type
Roman Numeral Converter
Convert standard Roman numerals and integers from 1 to 3999
JSON Minifier
Minify JSON, escape Unicode, and compare UTF-8 bytes
HTML Minifier
Minify HTML and remove unnecessary bytes
CSS Minifier
Clean CSS comments and redundant whitespace
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
Create HS256 test JWTs or unsigned none tokens
SQL Minifier
Clean SQL comments and redundant whitespace
User-Agent Parser
Parse browser, OS, device from UA string
HTTP Headers Parser (Raw Headers to JSON)
Inspect request or response text while preserving repeated header fields and their order
JSON Schema Validator
Validate JSON data against JSON Schema
JWT Verifier
Check HS256 signatures 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 five RGB shade variants from a hex 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 SRI values from UTF-8 resource text
JSONL Converter
Convert JSON array and JSON Lines
Line Sorter
Sort text lines with options
IBAN Validator
Check IBAN structure, checksum and duplicate line positions
Credit Card Validator
Validate card number with Luhn check
Email Extractor
Find and lowercase ASCII email candidates
URL Extractor
Find HTTP(S) URL candidates in pasted text
HTML to Text
Strip markup and retain selected text breaks
IPv6 Validator
Check IPv6 syntax, canonical addresses and scoped zone identifiers
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
List simple inline HTTP(S) labels and URLs
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 quoted href values from a tags
URL Canonicalizer
Compare URLs using a fixed normalization rule
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
Inspect a local score and common password patterns
Emoji Remover
Remove complete emoji sequences with optional symbol and whitespace cleanup
Whitespace Cleaner
Normalize spaces and tabs, trim line edges and manage blank lines
Base32 Encode / Decode
Convert UTF-8 text with RFC 4648 Base32
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 local times with explicit handling of repeated clock times
JSON Flatten / Unflatten
Flatten and restore JSON with typed object and array paths
CIDR Range Converter
Convert IPv4 CIDRs and inclusive ranges with exact coverage
Base58 Encode / Decode
Encode UTF-8; decode Base58 bytes and hex
AES Encrypt / Decrypt
Encrypt and decrypt text with AES-GCM
TOTP Generator
Generate SHA1 TOTP codes and compare local time windows
Cron Parser
Preview five-field numeric Cron with timezone and date anchor
JSON Path Extractor
Query a documented JSONPath subset with typed results
XPath Tester
Query XML with XPath 1.0, namespace bindings and complete typed results
Byte Size Converter
Compare decimal and binary byte units with total-bit output
Duration Converter
Convert non-negative time units and complete duration strings
IPv4 Integer Converter
Convert strict IPv4 addresses and unsigned 32-bit integers
CIDR Subnet Splitter
Split IPv4 networks into equal blocks by prefix or count
MAC Address Generator
Generate distinct MAC batches with explicit address bits
Snowflake ID Parser
Decode and generate Snowflake IDs
ULID Parser
Parse ULID timestamp and randomness
Base62 Encoder Decoder
Convert text bytes with the 0–9 A–Z a–z alphabet
CSV Column Extractor
Select CSV columns in an explicit order while retaining exact text and blank records
DNS Zone Parser
Inspect a supported BIND zone text subset
CIDR Merger
Collapse IPv4 CIDRs into the smallest exact address union
HTTPie to cURL Converter
Convert a supported HTTPie command into a POSIX cURL snippet
Sitemap Validator
Inspect one sitemap XML file and its core fields
Meta Tag Analyzer
Inspect HTML metadata values, duplicates and robots conflicts
IP Port Extractor
Extract and normalize IP endpoints in original log order
Date Difference Calculator
Compare elapsed time, civil dates and Monday–Friday counts
SQL Insert Generator
Generate MySQL, PostgreSQL or SQLite INSERT from CSV
JSON FormData Converter
Convert nested JSON to FormData fields
HTTP Request Builder
Build cURL and browser-compatible Fetch snippets from request fields
Robots.txt Validator
Lint Google-supported directives with source line numbers
Basic Auth Generator
Build an HTTP Basic header from UTF-8 credentials
INI to JSON
Convert a declared INI subset to JSON while preserving strings and rejecting duplicate keys
JSON Line Counter
Count physical JSONL rows and inspect syntax and UTF-8 sizes
URL Slug Checker
Inspect a title or URL segment and compare a readable slug suggestion
URL Query Cleaner
Batch-remove tracking fields with cleanup options
Content-Type Parser (MIME, Charset, Boundary)
Parse Content-Type headers and extract MIME parameters
Content-Type Generator (MIME Header Builder)
Build Content-Type values with optional charset and quoted parameters
Data URL Parser
Inspect a data: declaration, decoded byte count, and UTF-8 text preview
Set-Cookie Parser
Inspect response cookie pairs, ordered attributes, empty values and syntax diagnostics
Cache-Control Parser
Parse cache directives and compare browser and shared-cache freshness
CORS Header Generator
Generate static CORS response headers and check supplied preflight parameters
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 selected page Rotate flags to zero without transforming content
Split Odd and Even Pages
Split a PDF into two files: odd pages and even pages
PDF Info Inspector
Inspect original metadata and visible page dimensions
Split PDF Pages
Split a PDF by single page, fixed group size, or custom ranges
Add PDF Watermark
Center a Latin text watermark on every visible PDF page
Add Header & Footer to PDF
Add visible page headers, footers and page numbers
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
Add a relative rotation to even, odd or all PDF pages
PDF Pages to Images
Render visible PDF pages to PNG/JPEG in one ZIP
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
Check exact MAC syntax, convert formats and inspect bits
IP in CIDR Checker
Check IPv4/IPv6 membership with longest-prefix matches
TOTP QR Code Generator
Build a SHA1 otpauth URI, QR image, and current test code
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
Inspect HAR requests, separate body/content sizes and supported cURL snippets
IPv6 Subnet Calculator
Calculate exact IPv6 ranges and preview indexed child subnets
Remove PDF Metadata
Remove selected Info, catalog XMP and page XMP references locally
Basic Auth Decoder
Decode Basic credentials with an explicit UTF-8 interpretation
Proofpoint URL Decoder
Reveal original destinations wrapped by Proofpoint URL Defense v2 and v3
Excel to JSON Converter
Read XLSX worksheets with unique keys and timezone-free dates
JSON to SQL Converter
Generate typed MySQL, PostgreSQL or SQLite SQL 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
Inspect ordered CSV or TSV rows, preserve text, filter and export the current view
JSON Schema Generator
Infer a reviewed starter schema from strict JSON samples
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 supported metadata blocks and re-encode a sharing copy
SVG Optimizer
Optimize an offline SVG subset with SVGO and compare actual bytes
Flatten PDF
Write existing AcroForm appearances into page content with explicit limits
PDF Booklet Maker
Impose pages in duplex booklet order with blanks, paper, gutter, and direction controls
Crop PDF Pages
Crop visible PDF margins with rotation-aware physical units
Extract PDF Text
Export an existing PDF text layer as TXT or JSON
Remove PDF Annotations
Remove annotations with explicit link and whole-form options
N-up PDF
Place 2, 4, or 6 PDF pages on each A4 or Letter side
IPv6 Range to CIDR Converter
Convert inclusive IPv6 intervals to exact minimal CIDRs, or inspect a CIDR range
IPv6 Reverse DNS Generator
Keep the IPv6 host intact while generating its PTR owner, zone and BIND fragment
CIDR Exclude Calculator
Subtract contained IPv4 or IPv6 networks and inspect the exact minimal remainder
Wildcard Mask Calculator
Invert a contiguous IPv4 subnet mask and compare Cisco ACL address matches
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
Inspect candidate hash formats and embedded parameters
AWS ARN Parser
Parse AWS ARN partition, service, region, account, resource type, ID, and qualifier
XLSX Viewer
Inspect Excel coordinates, raw numbers, formatted values and formula caches locally
TOML to JSON Converter
Convert TOML 1.1 and JSON with explicit numeric, date and null handling
JSON Escape & Unescape
Escape text and decode JSON string layers with explicit stopping rules
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
Preserve dotenv strings, reject duplicate names and review optional JSON 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 named flat XML records into CSV with exact leaf text and distinct columns
CSV to XML Converter
Generate XML from strict CSV or TSV while preserving field text and Unicode names
JSON to XML Converter
Map strict JSON to XML with explicit arrays, root attributes and text rules
Barcode Generator
Generate six 1D barcode formats, inspect the encoded value, and download SVG/PNG
Barcode Decoder from Image
Decode supported 1D barcodes from local PNG, JPEG or WebP images
SVG to PNG Converter
Render an offline SVG subset to a PNG with explicit size and 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 decoded image pixels with HEX, RGB, HSL, alpha and coordinates; export one JSON sample
Cookie Header Parser
Read ordered request-cookie pairs, preserve duplicates and optionally decode percent escapes
Content-Disposition Parser & Generator
Inspect ordered filename parameters or generate an ASCII fallback with UTF-8 filename*
CSP Header Analyzer
Parse an existing Content-Security-Policy and flag wildcard, unsafe, insecure, duplicate, and missing controls
Redirect Map Validator
Inspect exact redirect CSV maps while preserving every original column and row
Extract PDF Attachments
Inspect standard embedded files and download a safe ZIP
PDF Form Field Inspector
Inspect typed AcroForm values and actual widget pages
PDF Grayscale Converter
Rebuild visible PDF pages as grayscale JPEG images
Compare PDF Text
Compare extracted text and page presence at matching positions
MAC Vendor Lookup
Find registered MAC prefixes using a dated IEEE snapshot
IP Address Anonymizer
Mask host bits while reviewing what remains in your log
OpenAPI Validator
Check OpenAPI 3.0/3.1 YAML/JSON syntax and selected local structure
Docker Compose Validator
Inspect selected Compose YAML structures, dependencies and resource references
Image Compressor
Try target-size compression, compare actual bytes and dimensions, and download a batch
PDF Compressor
Compare PDF object cleanup with JPEG page compression, entirely locally
PDF OCR
Recognize scan pixels and rebuild searchable PDFs at original displayed sizes
Image to Text OCR
Extract editable text from screenshots, receipts, and photos
Sign PDF
Draw, type or upload a visual signature on a PDF page
CSV to Excel
Convert CSV or TSV to XLSX while keeping text intact
Markdown to PDF
Render Markdown headings, lists, tables, and code into a PDF
DMARC Checker
Inspect direct DMARC, SPF and optional DKIM DNS records with partial checks
Remove Blank PDF Pages
Review conservative blank-page candidates before removing chosen pages
Remove Duplicate PDF Pages
Review pages with matching geometry, text positions and color previews
Split PDF by Bookmarks
Review non-overlapping chapter ranges, aliases and front matter
Bates Numbering PDF
Stamp a validated Bates sequence on selected PDF pages
WiFi QR Code Generator
Encode a WiFi name and password into a local PNG or SVG QR code
vCard QR Code Generator
Create a vCard 3.0 contact QR with PNG and SVG export
VLSM Subnet Calculator
Allocate IPv4 subnets from strict host requirements with exact capacity totals
Image Cropper
Crop images to presets, free ratio, or circle with a drag selection
Fill PDF Form
Fill existing AcroForm fields with checked font and appearance handling
PDF Page Size Converter
Fit, fill or center PDF pages on a new physical sheet size
HTML to Markdown
Convert HTML documents and fragments into clean Markdown with GFM tables
Merge CSV Files
Append CSV rows by column name or join multiple files on a shared key
Recently Updated Tools
Ordered by recorded update dateEmail Extractor
Find and lowercase ASCII email candidates
MAC Vendor Lookup
Find registered MAC prefixes using a dated IEEE snapshot
QR Code Generator
Generate a static QR PNG and verify its encoded text
Cache-Control Parser
Parse cache directives and compare browser and shared-cache freshness
Color Palette Generator
Generate five RGB shade variants from a hex color
N-up PDF
Place 2, 4, or 6 PDF pages on each A4 or Letter side
PDF Booklet Maker
Impose pages in duplex booklet order with blanks, paper, gutter, and direction controls
Repeat Entire PDF
Duplicate the entire PDF document 2-20 times in one file
Split Odd and Even Pages
Split a PDF into two files: odd pages and even pages
Add Header & Footer to PDF
Add visible page headers, footers and page numbers
Add PDF Watermark
Center a Latin text watermark on every visible PDF page
AES Encrypt / Decrypt
Encrypt and decrypt text with AES-GCM
Practical Guides
Step-by-step workflows that combine multiple tools to solve real tasks.Check Booklet Page Order: Eight Pages, Seven Pages, and Duplex Printing
Follow numbered PDF samples to verify booklet front/back pairs, a padded blank slot, reading direction, and the difference between PDF sides and paper sheets.
Repeat a PDF or Print Multiple Copies? Check Page Order First
Use a numbered three-page sample to compare whole-document repetition, selected-page duplication, and printer copies, including the odd-page duplex boundary.
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
Reproduce Unicode slug suggestions, preserve URL context, and check changes before migrating a published page.
Password and Token Handling: Generate, Check, and Revoke a Test Credential
Try a 24-character password, compare token length units, separate hashes from HMAC, and rehearse credential replacement with a test account.
Start Here
These starting points cover text, encoding and developer data tasks.
Walkthroughs
Follow the steps to compare inputs, outputs and limitations before choosing tools for a task.
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Tool pages distinguish recorded updates from completed reviews, with privacy information and an issue-report channel.
- Core tool pages are reviewed for result and guidance quality
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- Editorial policy, privacy notes, and issue-report channel are available