21 free tools that run in your browser

No signup. No uploads. No tracking. Everything happens on your own device.

Developer

Format, decode and inspect the data formats you work with every day.

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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.

Text Case ConverterConvert text between camelCase, snake_case, kebab-case, Title Case and more.Text Diff CheckerCompare two blocks of text and highlight every addition and deletion.Word CounterCount words, characters, sentences, paragraphs and reading time.

Calculator

Percentages, returns and compounding, with the formula always visible.

Compound Interest CalculatorProject growth from a starting balance, regular contributions and a rate of return.ROI CalculatorCalculate return on investment, net gain and annualised ROI.Percentage CalculatorWork out percentages, percentage change and reverse percentages.

Date & Time

Timestamps, timezones and date arithmetic that actually handles edge cases.

Unix Timestamp ConverterConvert Unix timestamps to dates and back, in UTC and your local timezone.Date Difference CalculatorCount the days, weeks, months and business days between two dates.

Image

Resize and convert images with Canvas. Files never leave your device.

Image ConverterConvert between JPG, PNG and WebP with adjustable quality.Image ResizerResize images to exact dimensions or a percentage, without uploading them.

Web

Generators for the small artefacts every website ends up needing.

QR Code GeneratorCreate QR codes for links, text, Wi-Fi and contact cards.