Developer Guides & Tutorials
Find instructions beside each tool, including a worked example, relevant limitations and an explanation of how its inputs are processed.
Why our guides?
Start with the task you need to complete. Each linked page explains its supported inputs and how to interpret the output.
Examples describe specific settings. Network and generated results can vary; compare the output with your source and report discrepancies.
JSON Formatter
Inspect API responses and configuration by formatting, minifying or expanding JSON.
Usage · Example · Limitations · Data processing
SQL Formatter
Make a SQL query easier to review without executing it.
Usage · Example · Limitations · Data processing
Regex Tester
Find JavaScript regular-expression matches in sample text.
Usage · Example · Limitations · Data processing
Cron Parser
Preview actual UTC dates for a five-field Unix cron schedule.
Usage · Example · Limitations · Data processing
JWT Decoder
Inspect a JWT header, payload and available timestamp claims.
Usage · Example · Limitations · Data processing
Markdown Preview
Preview a lightweight subset of Markdown while drafting text.
Usage · Example · Limitations · Data processing
Hash Generator
Calculate text or binary-file checksums for comparison.
Usage · Example · Limitations · Data processing
HMAC Generator & Verifier
Generate or compare a keyed message authentication code.
Usage · Example · Limitations · Data processing
UUID Generator
Create random v4 or time-ordered v7 identifiers and inspect UUID structure.
Usage · Example · Limitations · Data processing
Base64 Encoder
Encode UTF-8 text or decode Base64 text for data interchange.
Usage · Example · Limitations · Data processing
URL Encoder
Percent-encode text for URL components or decode escaped text.
Usage · Example · Limitations · Data processing
HTML Encoder
Escape HTML-sensitive text or inspect HTML entities.
Usage · Example · Limitations · Data processing
Hex Converter
Convert UTF-8 text to hexadecimal bytes and back.
Usage · Example · Limitations · Data processing
Binary Converter
Convert UTF-8 text to eight-bit byte strings and back.
Usage · Example · Limitations · Data processing
ROT13 Cipher
Apply the reversible ROT13 letter substitution.
Usage · Example · Limitations · Data processing
JSON to TypeScript
Draft TypeScript declarations from a JSON example.
Usage · Example · Limitations · Data processing
JSON to C#
Draft C# classes from the shapes and values in sample JSON.
Usage · Example · Limitations · Data processing
JSON to CSV
Export a JSON array as delimited rows.
Usage · Example · Limitations · Data processing
CSV to JSON
Parse delimited records into JSON for an import or API fixture.
Usage · Example · Limitations · Data processing
JSON to SQL
Draft SQL table definitions or inserts from sample records.
Usage · Example · Limitations · Data processing
JSON to YAML
Translate JSON configuration into YAML.
Usage · Example · Limitations · Data processing
Webhook Tester
Inspect HTTP requests received by a temporary webhook endpoint.
Usage · Example · Limitations · Data processing
Text Diff
Compare two text versions to locate edits.
Usage · Example · Limitations · Data processing
SVG Optimizer
Reduce supported SVG markup overhead before export.
Usage · Example · Limitations · Data processing
Unit Converter
Convert measurements between units in the same category.
Usage · Example · Limitations · Data processing
JSON Schema Generator
Infer a draft JSON Schema from example data.
Usage · Example · Limitations · Data processing
JSON Schema Validator
Validate a JSON instance against a supported JSON Schema dialect.
Usage · Example · Limitations · Data processing
YAML to JSON
Convert supported YAML documents into JSON.
Usage · Example · Limitations · Data processing
Cron Expression Builder
Assemble a five-field cron expression from individual fields.
Usage · Example · Limitations · Data processing
URL Parser
Inspect a URL’s host, path, protocol and parameters.
Usage · Example · Limitations · Data processing
JSONPath Tester
Extract matching values and normalized paths from JSON.
Usage · Example · Limitations · Data processing
Query String Converter
Convert query parameters to JSON and rebuild encoded query strings.
Usage · Example · Limitations · Data processing
HTTP Status Reference
Look up common HTTP response meanings while debugging.
Usage · Example · Limitations · Data processing
MIME Type Lookup
Find common file extensions and associated media types.
Usage · Example · Limitations · Data processing
Network Diagnostics
Choose among DNS, IP, domain registration, TLS, header and subnet checks.
Usage · Example · Limitations · Data processing
DNS Lookup
Inspect public DNS records for a domain.
Usage · Example · Limitations · Data processing
My IP Address
Inspect the public address visible to this service.
Usage · Example · Limitations · Data processing
IP Address Lookup
Look up approximate network ownership and location information.
Usage · Example · Limitations · Data processing
WHOIS / RDAP Lookup
Inspect public domain registration data through RDAP.
Usage · Example · Limitations · Data processing
SSL Certificate Checker
Inspect the TLS certificate presented by a public host.
Usage · Example · Limitations · Data processing
HTTP Headers Checker
Inspect HTTP response headers from a public URL.
Usage · Example · Limitations · Data processing
Subnet Calculator
Calculate IPv4 network boundaries from CIDR notation.
Usage · Example · Limitations · Data processing
PDF to Image
Render PDF pages as raster images.
Usage · Example · Limitations · Data processing
PDF Text Extractor
Extract a PDF text layer into TXT or Word-readable RTF.
Usage · Example · Limitations · Data processing
Image to PDF
Combine supported images into a PDF document.
Usage · Example · Limitations · Data processing
PDF Merge & Split
Combine PDF documents or extract selected pages.
Usage · Example · Limitations · Data processing
PDF Metadata
Remove supported PDF document-information fields.
Usage · Example · Limitations · Data processing
PDF to CSV/Excel
Extract positioned PDF text into approximate table rows.
Usage · Example · Limitations · Data processing
VTT/SRT to CSV
Export subtitle cues as tabular timing and text data.
Usage · Example · Limitations · Data processing
Image OCR
Extract approximate text from an image with browser OCR.
Usage · Example · Limitations · Data processing
Image Compressor
Re-encode images to trade file size against visual quality.
Usage · Example · Limitations · Data processing
Image Format Converter
Convert browser-decodable images to an available output format.
Usage · Example · Limitations · Data processing
EXIF Stripper
Re-export an image to remove supported metadata.
Usage · Example · Limitations · Data processing
QR Generator
Create static QR images for text, links and supported structured payloads.
Usage · Example · Limitations · Data processing
Barcode Generator
Encode supported text as a Code 128 barcode.
Usage · Example · Limitations · Data processing
Favicon Generator
Produce icon assets from the available image or design inputs.
Usage · Example · Limitations · Data processing
Color Picker
Inspect and convert color values for screen design.
Usage · Example · Limitations · Data processing
Social Image
Compose a raster graphic for social sharing.
Usage · Example · Limitations · Data processing
Brand Context
Build an editable brand brief for reuse in prompts and documents.
Usage · Example · Limitations · Data processing
Code to Image
Render a code excerpt as a shareable image.
Usage · Example · Limitations · Data processing
Thread Splitter
Break a long draft into smaller post-sized pieces.
Usage · Example · Limitations · Data processing
OG Preview
Fetch page metadata and preview a possible link card.
Usage · Example · Limitations · Data processing
UTM Builder
Build consistent campaign URLs without losing unrelated parameters.
Usage · Example · Limitations · Data processing
Schema Markup Generator
Draft JSON-LD from the supported structured-data forms.
Usage · Example · Limitations · Data processing
Meta Tag Generator
Draft title, description and sharing tags for a page.
Usage · Example · Limitations · Data processing
SERP Preview
Estimate how a title, URL and description may look in search.
Usage · Example · Limitations · Data processing
Robots.txt Generator
Draft crawler directives for a robots.txt file.
Usage · Example · Limitations · Data processing
XML Sitemap Generator
Create sitemap XML from a list of canonical URLs.
Usage · Example · Limitations · Data processing
Hreflang Generator
Draft alternate-language links for corresponding localized pages.
Usage · Example · Limitations · Data processing
AI Token Counter
Estimate prompt size without calling a model.
Usage · Example · Limitations · Data processing
AI Cost Calculator
Calculate a budget from token volumes and manually supplied prices.
Usage · Example · Limitations · Data processing
Word Counter
Count text units and estimate reading time.
Usage · Example · Limitations · Data processing
SMS Counter
Estimate SMS segments under GSM-7 or Unicode encoding.
Usage · Example · Limitations · Data processing
Case Converter
Change text casing for prose or simple identifiers.
Usage · Example · Limitations · Data processing
Timestamp Converter
Convert Unix epoch values and dates.
Usage · Example · Limitations · Data processing
Lorem Ipsum
Create temporary layout text for design testing.
Usage · Example · Limitations · Data processing
Text Cleaner
Apply selected text cleanup operations.
Usage · Example · Limitations · Data processing
Tone Formalizer
Draft a different tone for a message, with a clearly identified local fallback.
Usage · Example · Limitations · Data processing
SimpleTaskTool
Organize tasks with the richer task-workspace controls.
Usage · Example · Limitations · Data processing
Task Manager
Keep a lightweight local checklist with priorities.
Usage · Example · Limitations · Data processing
Loan Calculator
Estimate fixed-rate payments and inspect an amortization schedule.
Usage · Example · Limitations · Data processing
Age Calculator
Calculate elapsed calendar age between two dates.
Usage · Example · Limitations · Data processing
Percentage Calculator
Calculate a percentage of a value, a ratio or percentage change.
Usage · Example · Limitations · Data processing
SIP Calculator
Project monthly contributions at an assumed constant return.
Usage · Example · Limitations · Data processing
Compound Interest Calculator
Project growth of a balance with compounding and optional contributions.
Usage · Example · Limitations · Data processing
VCF to Excel
Export supported vCard contact fields to spreadsheet-readable CSV.
Usage · Example · Limitations · Data processing
Meeting Cost
Estimate attendee time cost for a meeting.
Usage · Example · Limitations · Data processing
Subscription Tracker
Summarize recurring costs from a manually maintained list.
Usage · Example · Limitations · Data processing
Time Estimator
Combine task-duration assumptions into a planning estimate.
Usage · Example · Limitations · Data processing
Invoice Generator
Draft line-item invoices and print a local PDF.
Usage · Example · Limitations · Data processing
GST Calculator
Calculate tax-inclusive or tax-exclusive amounts using an entered rate.
Usage · Example · Limitations · Data processing
Profit Margin Calculator
Distinguish gross profit, margin and markup.
Usage · Example · Limitations · Data processing
Secure Key Generator
Generate random strings in selected secret or identifier formats.
Usage · Example · Limitations · Data processing
Password Generator
Generate a random password from selected character sets.
Usage · Example · Limitations · Data processing
Password Strength
Estimate password characteristics for educational comparison.
Usage · Example · Limitations · Data processing
Color Contrast Checker
Compare opaque sRGB foreground and background contrast.
Usage · Example · Limitations · Data processing
CSV Duplicate Remover
Remove duplicate CSV records using selected comparison columns.
Usage · Example · Limitations · Data processing
ROAS & Break-Even Calculator
Compare attributed revenue with ad spend and contribution costs.
Usage · Example · Limitations · Data processing
Chmod Permission Calculator
Translate Unix permission bits into octal and symbolic forms.
Usage · Example · Limitations · Data processing
.env Example Generator
Create a values-free environment-variable template.
Usage · Example · Limitations · Data processing
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