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40 free tools · no sign-up · runs in your browser
Essential Tools for Developers, Writers & Creators
Format JSON, count words, generate passwords, convert timestamps and more — instantly, privately and free.
All tools
40 tools
Text Tools
Word Counter
Count words, characters, sentences, paragraphs and reading time as you type.
Open toolDeveloper ToolsJSON Formatter
Validate, prettify and minify JSON with instant error reporting.
Open toolCalculatorsAspect Ratio Calculator
Find the missing width or height for 16:9, 4:3, 1:1, 9:16 and custom ratios.
Open toolText ToolsCase Converter
Switch text between UPPERCASE, lowercase, Title, camel, snake and kebab case.
Open toolCalculatorsPercentage Calculator
Three calculators for percent of a number, ratios and percent change.
Open toolDeveloper ToolsBase64 Encoder / Decoder
Encode text to Base64 and decode Base64 strings back to plain text.
Open toolText ToolsLorem Ipsum Generator
Generate placeholder paragraphs, sentences or words for layouts.
Open toolDeveloper ToolsPassword & UUID Generator
Create strong random passwords and UUID v4 strings in your browser.
Open toolDeveloper ToolsTime & Timestamp Converter
Convert UTC to local time and Unix epoch timestamps to readable dates.
Open toolDeveloper ToolsCSS Box Shadow Generator
Design shadows visually with live preview and copy the CSS instantly.
Open toolDeveloper ToolsCSV to JSON Converter
Turn raw CSV text or an uploaded .csv file into clean, formatted JSON.
Open toolDeveloper ToolsSQL Formatter
Prettify and indent raw SQL queries with consistent keyword casing.
Open toolDeveloper ToolsURL Encoder / Decoder
Percent-encode URLs and query values, or decode encoded strings back.
Open toolDeveloper ToolsJWT Decoder
Inspect JSON Web Token headers, payload claims and expiry client-side.
Open toolDesign ToolsColor Converter
Convert colours between HEX, RGB, HSL and CMYK with a live swatch.
Open toolDesign ToolsCSS Gradient Generator
Build linear and radial gradients visually and export clean CSS.
Open toolMarketing ToolsROAS Calculator
Calculate return on ad spend, profit after spend and break-even ROAS.
Open toolMarketing ToolsCPM Calculator
Solve for CPM, total ad cost or impressions from any two values.
Open toolMarketing ToolsMeta Tag Generator
Generate SEO, Open Graph and Twitter Card tags with a live preview.
Open toolText ToolsReadability Checker
Score text with Flesch reading ease and Flesch-Kincaid grade level.
Open toolCalculatorsPayPal & Stripe Fee Calculator
Work out processing fees, net payouts and the gross amount to invoice.
Open toolCalculatorsFreelance Hourly Rate Calculator
Find the hourly rate you need from income goals, overheads and billable hours.
Open toolCalculatorsCompound Interest Calculator
Model investment growth with monthly contributions, a chart and a yearly table.
Open toolDesign ToolsImage Resizer
Resize and rescale PNG, JPEG and WebP images privately in your browser.
Open toolDesign ToolsSVG to PNG Converter
Turn SVG files or inline markup into high-resolution PNG downloads.
Open toolDesign ToolsImage Color Picker
Pick pixel colors and extract a 5-color dominant palette in HEX and RGB.
Open toolDeveloper ToolsText Diff Checker
Compare two texts or code snippets with line-by-line change highlighting.
Open toolDeveloper ToolsMarkdown to HTML
Convert Markdown to clean HTML with a live side-by-side preview.
Open toolDeveloper ToolsRegex Tester
Test regular expressions live with match highlighting and capture groups.
Open toolMarketing ToolsSocial Post Previewer
Preview LinkedIn, Twitter/X and Facebook posts with live character counts.
Open toolCalculatorsChurn Rate & LTV Calculator
Work out customer churn, revenue churn, net retention and lifetime value.
Open toolMarketing ToolsUTM Link Builder
Generate clean, correctly encoded campaign tracking URLs in one click.
Open toolDeveloper ToolsCron Expression Generator
Build and read cron schedules visually with plain-English explanations.
Open toolDeveloper ToolsHash Generator
Compute MD5, SHA-1, SHA-256 and SHA-512 digests instantly in your browser.
Open toolDesign ToolsFavicon Generator
Turn any square logo into favicon.ico plus every PNG size browsers need.
Open toolDeveloper ToolsHTML Entity Encoder
Escape reserved HTML characters or decode entity strings back to text.
Open toolMarketing ToolsRobots.txt Generator
Create valid crawler directives with allow, disallow and sitemap rules.
Open toolCalculatorsInflation Calculator
Compare purchasing power across years using US CPI data from 1913.
Open toolDeveloper ToolsJavaScript Keycode Finder
Press any key to inspect event.key, event.code, keyCode and location.
Open toolMarketing ToolsEmail Subject Line Tester
Check subject length, spam triggers and inbox truncation before sending.
Open toolDeveloper Tools
Developer Tools
JSON Formatter
Validate, prettify and minify JSON with instant error reporting.
Open toolDeveloper ToolsBase64 Encoder / Decoder
Encode text to Base64 and decode Base64 strings back to plain text.
Open toolDeveloper ToolsPassword & UUID Generator
Create strong random passwords and UUID v4 strings in your browser.
Open toolDeveloper ToolsTime & Timestamp Converter
Convert UTC to local time and Unix epoch timestamps to readable dates.
Open toolDeveloper ToolsCSS Box Shadow Generator
Design shadows visually with live preview and copy the CSS instantly.
Open toolDeveloper ToolsCSV to JSON Converter
Turn raw CSV text or an uploaded .csv file into clean, formatted JSON.
Open toolDeveloper ToolsSQL Formatter
Prettify and indent raw SQL queries with consistent keyword casing.
Open toolDeveloper ToolsURL Encoder / Decoder
Percent-encode URLs and query values, or decode encoded strings back.
Open toolDeveloper ToolsJWT Decoder
Inspect JSON Web Token headers, payload claims and expiry client-side.
Open toolDeveloper ToolsText Diff Checker
Compare two texts or code snippets with line-by-line change highlighting.
Open toolDeveloper ToolsMarkdown to HTML
Convert Markdown to clean HTML with a live side-by-side preview.
Open toolDeveloper ToolsRegex Tester
Test regular expressions live with match highlighting and capture groups.
Open toolDeveloper ToolsCron Expression Generator
Build and read cron schedules visually with plain-English explanations.
Open toolDeveloper ToolsHash Generator
Compute MD5, SHA-1, SHA-256 and SHA-512 digests instantly in your browser.
Open toolDeveloper ToolsHTML Entity Encoder
Escape reserved HTML characters or decode entity strings back to text.
Open toolDeveloper ToolsJavaScript Keycode Finder
Press any key to inspect event.key, event.code, keyCode and location.
Open toolText Tools
Text Tools
Word Counter
Count words, characters, sentences, paragraphs and reading time as you type.
Open toolText ToolsCase Converter
Switch text between UPPERCASE, lowercase, Title, camel, snake and kebab case.
Open toolText ToolsLorem Ipsum Generator
Generate placeholder paragraphs, sentences or words for layouts.
Open toolText ToolsReadability Checker
Score text with Flesch reading ease and Flesch-Kincaid grade level.
Open toolCalculators
Calculators
Aspect Ratio Calculator
Find the missing width or height for 16:9, 4:3, 1:1, 9:16 and custom ratios.
Open toolCalculatorsPercentage Calculator
Three calculators for percent of a number, ratios and percent change.
Open toolCalculatorsPayPal & Stripe Fee Calculator
Work out processing fees, net payouts and the gross amount to invoice.
Open toolCalculatorsFreelance Hourly Rate Calculator
Find the hourly rate you need from income goals, overheads and billable hours.
Open toolCalculatorsCompound Interest Calculator
Model investment growth with monthly contributions, a chart and a yearly table.
Open toolCalculatorsChurn Rate & LTV Calculator
Work out customer churn, revenue churn, net retention and lifetime value.
Open toolCalculatorsInflation Calculator
Compare purchasing power across years using US CPI data from 1913.
Open toolDesign Tools
Design Tools
Color Converter
Convert colours between HEX, RGB, HSL and CMYK with a live swatch.
Open toolDesign ToolsCSS Gradient Generator
Build linear and radial gradients visually and export clean CSS.
Open toolDesign ToolsImage Resizer
Resize and rescale PNG, JPEG and WebP images privately in your browser.
Open toolDesign ToolsSVG to PNG Converter
Turn SVG files or inline markup into high-resolution PNG downloads.
Open toolDesign ToolsImage Color Picker
Pick pixel colors and extract a 5-color dominant palette in HEX and RGB.
Open toolDesign ToolsFavicon Generator
Turn any square logo into favicon.ico plus every PNG size browsers need.
Open toolMarketing Tools
Marketing Tools
ROAS Calculator
Calculate return on ad spend, profit after spend and break-even ROAS.
Open toolMarketing ToolsCPM Calculator
Solve for CPM, total ad cost or impressions from any two values.
Open toolMarketing ToolsMeta Tag Generator
Generate SEO, Open Graph and Twitter Card tags with a live preview.
Open toolMarketing ToolsSocial Post Previewer
Preview LinkedIn, Twitter/X and Facebook posts with live character counts.
Open toolMarketing ToolsUTM Link Builder
Generate clean, correctly encoded campaign tracking URLs in one click.
Open toolMarketing ToolsRobots.txt Generator
Create valid crawler directives with allow, disallow and sitemap rules.
Open toolMarketing ToolsEmail Subject Line Tester
Check subject length, spam triggers and inbox truncation before sending.
Open toolInstant results
No sign-up, no queues, no limits. Tools respond as fast as you can type.
Built for daily work
Utilities developers, writers and creators actually reach for — kept simple and sharp.