Free tools that just work.
Fast, private tools for developers, creators and everyday tasks.
Why use these tools
- Your data stays with you
- Everything runs in your browser. Nothing is uploaded.
- Fast and quiet
- No cookie banner, no popups, no newsletter.
- Free, no account
- Open a tool, use it, close the tab.
Popular tools
JSON FormatterFormat, validate and minify JSON with exact error positions.Vietnam Salary CalculatorGross to net pay in Vietnam under the 2026 rules: five tax brackets, new deductions, insurance caps.Image CompressorShrink JPEG, PNG and WebP files without uploading them.Word CounterCount words, characters, sentences and reading time as you type.Age CalculatorWork out an exact age in years, months and days, at any date.Unit ConverterConvert length, weight, temperature, volume and more, in both directions.
Browse by category
Developer ToolsFormat, decode and test the data you work with every day, entirely in your browser.13 toolsFinance CalculatorsWork out loan payments, savings growth and other money questions without a spreadsheet.8 toolsImage ToolsCompress and resize images on your own device. The files never leave your browser.6 toolsText ToolsCount, clean, reshape and convert text without leaving the page.7 toolsDate and Time ToolsWork out ages, gaps between dates, time zones and Unix timestamps.5 toolsConvertersTurn one format into another: units, data formats and encodings.1 toolGeneratorsCreate identifiers, passwords, placeholder data and other one-off values.5 toolsDesign ToolsColour, spacing and asset helpers for designers and front-end developers.2 tools
All tools
Developer Tools
JSON FormatterFormat, validate and minify JSON with exact error positions.JWT DecoderDecode a JSON Web Token and read its header, payload and expiry.Base64 Encoder and DecoderConvert text to Base64 and back, including URL-safe output.Regex TesterTest regular expressions with live matches, groups and flags.UUID GeneratorGenerate random UUIDs in bulk, ready to copy.Hash GeneratorCompute SHA-1, SHA-256, SHA-384 and SHA-512 for text or a file.URL Encoder and DecoderPercent-encode and decode URLs, and take a URL apart parameter by parameter.HTML Entity EncoderEscape text for HTML and decode entities back to readable characters.Diff CheckerCompare two texts line by line and see exactly what changed.SQL FormatterFormat and minify SQL across eight dialects, with readable indentation.CSV to JSON ConverterConvert CSV to JSON and back, with delimiter detection and Excel-safe export.Cron Expression ParserExplain a cron schedule in plain words and list its next run times.Markdown PreviewWrite GitHub-flavored Markdown and see the rendered result live.
Finance Calculators
Loan CalculatorWork out the monthly payment, the total repaid and how much of it is interest.Vietnam Salary CalculatorGross to net pay in Vietnam under the 2026 rules: five tax brackets, new deductions, insurance caps.Compound Interest CalculatorSee how savings grow with regular contributions and compounding.Currency ConverterConvert between thirty currencies at daily reference rates, with the age of the rate shown.Percentage CalculatorFour percentage questions, each with its own form and formula.Discount CalculatorWork out a sale price, including stacked discounts and tax.ROI CalculatorReturn on investment, with an annualised figure only where it means something.Tip CalculatorSplit a bill without losing the odd cents that will not divide.
Image Tools
Image CompressorShrink JPEG, PNG and WebP files without uploading them.Image ResizerResize images to exact dimensions or by percentage.Image ConverterConvert between JPEG, PNG, WebP and AVIF in your browser.Image CropperCrop, rotate and flip an image, with fixed ratios and keyboard control.Image to Base64Turn an image into a data URI, with the CSS and HTML ready to paste.Favicon GeneratorMake every favicon size from one image, with the .ico and the snippets.
Text Tools
Word CounterCount words, characters, sentences and reading time as you type.Case ConverterSee your text in nine cases at once and copy the one you need.Slug GeneratorTurn a title into a clean URL slug, with Vietnamese marks folded.Text CleanerStrip invisible characters, stray spaces and smart quotes from text.Remove Duplicate LinesRemove repeated lines, or show only the ones that repeated.Number to WordsSpell a number in Vietnamese or English words, ready for invoices.Sort LinesSort lines alphabetically, numerically, by length or at random.
Date and Time Tools
Unix Timestamp ConverterConvert between Unix timestamps and human-readable dates.Age CalculatorWork out an exact age in years, months and days, at any date.Date CalculatorAdd or subtract time from a date, or count the days between two.Lunar Calendar ConverterConvert between solar and Vietnamese lunar dates, with can chi and solar terms.Time Zone ConverterConvert a time between zones, with daylight-saving edges flagged.
Generators
QR Code GeneratorMake a QR code for a link, WiFi network, contact card and more.VietQR Transfer CodeBank-transfer QR for any Vietnamese bank, built in your browser.Password GeneratorStrong passwords from cryptographic randomness, never Math.random.Lorem Ipsum GeneratorPlaceholder text in Latin, or in Vietnamese with real tone marks.Random Data GeneratorFake rows for testing, as JSON, CSV or SQL. Never real people.