All tools
21 tools across 6 categories. Everything runs locally in your browser — press ⌘K anywhere to jump straight to one.
A–Z
Base64 Encoder / DecoderConvert text to Base64 and back, with correct UTF-8 handling.DeveloperCompound Interest CalculatorProject growth from a starting balance, regular contributions and a rate of return.CalculatorCron Expression ParserExplain a cron expression in plain English and preview the next runs.DeveloperDate Difference CalculatorCount the days, weeks, months and business days between two dates.Date & TimeHash GeneratorCompute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text.DeveloperImage ConverterConvert between JPG, PNG and WebP with adjustable quality.ImageImage ResizerResize images to exact dimensions or a percentage, without uploading them.ImageJSON FormatterFormat, validate and minify JSON with precise error positions.DeveloperJWT DecoderDecode a JSON Web Token and read its header, payload and expiry.DeveloperPercentage CalculatorWork out percentages, percentage change and reverse percentages.CalculatorQR Code GeneratorCreate QR codes for links, text, Wi-Fi and contact cards.WebRegex TesterTest regular expressions live with highlighted matches and capture groups.DeveloperROI CalculatorCalculate return on investment, net gain and annualised ROI.CalculatorSQL FormatterBeautify SQL queries with dialect-aware keyword casing and indentation.DeveloperText Case ConverterConvert text between camelCase, snake_case, kebab-case, Title Case and more.TextText Diff CheckerCompare two blocks of text and highlight every addition and deletion.TextUnix Timestamp ConverterConvert Unix timestamps to dates and back, in UTC and your local timezone.Date & TimeURL Encoder / DecoderPercent-encode and decode URLs, with component and full-URL modes.DeveloperUUID GeneratorGenerate cryptographically random UUID v4 identifiers in bulk.DeveloperWord CounterCount words, characters, sentences, paragraphs and reading time.TextYAML FormatterValidate and reformat YAML, or convert it to JSON.Developer
Developer
Format, decode and inspect the data formats you work with every day.
JSON FormatterFormat, validate and minify JSON with precise error positions.JWT DecoderDecode a JSON Web Token and read its header, payload and expiry.Regex TesterTest regular expressions live with highlighted matches and capture groups.Base64 Encoder / DecoderConvert text to Base64 and back, with correct UTF-8 handling.Cron Expression ParserExplain a cron expression in plain English and preview the next runs.SQL FormatterBeautify SQL queries with dialect-aware keyword casing and indentation.YAML FormatterValidate and reformat YAML, or convert it to JSON.Hash GeneratorCompute MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text.URL Encoder / DecoderPercent-encode and decode URLs, with component and full-URL modes.UUID GeneratorGenerate cryptographically random UUID v4 identifiers in bulk.
Text
Count, convert, compare and clean up text without leaving the browser.
Calculator
Percentages, returns and compounding, with the formula always visible.
Date & Time
Timestamps, timezones and date arithmetic that actually handles edge cases.
Image
Resize and convert images with Canvas. Files never leave your device.
Web
Generators for the small artefacts every website ends up needing.