Test Credit Card Generator
Generate Luhn-valid test card numbers that no processor will ever charge.
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Cron Expression Generator
Build a cron schedule from controls and see the next times it runs.
Border Radius Generator
Shape corners individually, including the elliptical slash syntax.
Box Shadow Generator
Build layered box shadows visually, with a live preview.
File Checksum Calculator
Verify a download by computing its SHA-256 without uploading it anywhere.
SQL Minifier
Collapse a SQL query to one line and strip its comments.
JSON to Dart Class
Generate Dart model classes with fromJson and toJson from a sample payload.
JSON to Go Struct
Generate Go structs with json tags from a sample payload.
Day Counter
Days between dates, with or without weekends and holidays.
Logarithm Calculator
Log to any base, natural log and antilog, with the change of base shown.
Image to Text OCR
Extract text from a screenshot, scan or photograph.
Image Alt Text Generator
Build alt text that is useful, with length and quality checks.
Gradient Image Generator
Create a gradient image as a real downloadable file.
Quote Image Maker
Turn a quote into a shareable image with a background.
Sort Lines Z–A
Sort a list into reverse alphabetical order.
Word Difference Checker
See which words were added, removed or kept between two drafts.
Text Statistics
A complete profile of any text in one pass.
BMI Calculator
Calculate body mass index in metric or imperial units.
ChatGPT Export to Markdown
Turn conversations.json from a ChatGPT or Claude export into readable Markdown files.
CGPA to Percentage Converter
GPA and percentage both ways, on the Bangladeshi, CBSE, Indian and US scales.
Fake Address Generator
Generate plausible addresses in the format each country actually uses.
Fake Data Generator
Generate realistic test rows in JSON, CSV or SQL from fields you choose.
API Key Generator
Generate prefixed API keys in the format modern providers use.
MD5 Generator
Generate an MD5 hash of any text, with a straight answer about when not to.
JSON Repair
Fix broken JSON: trailing commas, single quotes, unquoted keys and comments.
Amortization Calculator
Every payment split into principal and interest, with totals.
Mortgage Calculator
Monthly mortgage payment with tax, insurance and total interest.
Factor Calculator
Every factor of a number, in pairs, with prime factors marked.
SVG Path Editor
Inspect, tidy and transform SVG path data.
SVG Viewer
Preview SVG markup live and inspect what is inside it.
Profile Picture Maker
Crop and preview a profile picture as it will really appear.
Duotone Generator
Map an image onto two colours for a bold graphic look.
Image Blur Tool
Blur a whole photo, or just the part you drag over.
Animated WebP Maker
Turn a set of frames into an animated WebP or GIF.
Expand Image Canvas
Grow the frame around a photo and choose where it sits.
Justify Text
Stretch lines to a flush right margin by spacing the words.
Underline Text Generator
Underline text with combining marks that survive pasting.
IP Subnet Calculator
Network, broadcast and host range from any CIDR block.
Relative Luminance Calculator
Compute WCAG relative luminance and see the maths behind it.
IPv4 to IPv6 Converter
Convert an IPv4 address into every IPv6 form that carries it, and back.
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