All tools
33 tools across 9 domains. Or press ⌘K to search from anywhere on the site.
Sponsored
This space is reserved for a sponsor. Every tool on this site stays free and runs locally in your browser.
Data & Format
Formatting, validation and conversion for structured data such as JSON, YAML, XML, CSV and TOML.
8 toolsJSON Tools
Category page →JSON FormatterPaste JSON to pretty-print it with consistent indentation, minify it to one line, or find the exact line and column of a syntax error. Runs locally.JSON DiffCompare two JSON documents and see every added, removed and changed value, with the JSON path of each difference and a one-click copy.JSON to CSVConvert JSON to CSV with a documented rule for flattening nested objects and arrays, plus a round-trip check that shows what the reverse conversion loses.JSON to YAMLConvert JSON to YAML and YAML to JSON in your browser, with a clear note on what the round trip loses: comments, anchors, multiple documents and key order.JSON Schema ValidatorValidate a JSON document against a JSON Schema and get every error with its exact path, including failures nested inside objects and array items. Runs locally.JSON to XMLConvert JSON to XML and XML to JSON with the array mapping rules spelled out, so the output matches what your downstream consumer expects.JSONPath TesterRun a JSONPath expression against your own JSON and get every match together with the path that reached it. Filter, slice and search without writing code.JSON to TOML ConverterConvert JSON to TOML and TOML to JSON, with a clear choice for how null values are handled, since TOML has no null. Runs locally.
Sponsored
This space is reserved for a sponsor. Every tool on this site stays free and runs locally in your browser.
Text & Encoding
Word counts, character checks and other text statistics for writers and editors.
1 toolCalculation & Conversion
Loan, money and unit calculators for everyday decisions.
13 toolsCalculators
Category page →Extra Payment Mortgage CalculatorSee how extra monthly or one-off payments shorten a mortgage and how much interest they remove, with a month-by-month schedule. Runs locally.Car Insurance Comparison CalculatorCompare car insurance quotes side by side: annual premium, deductible, and the out-of-pocket cost before cover starts. See the real yearly cost.Personal Injury Settlement CalculatorEstimate what a personal injury claim may be worth from medical costs, lost earnings and pain and suffering, with liability and policy limits applied.Life Insurance Needs CalculatorWork out how much life insurance your household actually needs to replace income and clear debts, and see the gap with the cover you already hold.Credit Card Payoff CalculatorSee how long it takes to clear your card balances and what the interest costs. Compare the avalanche and snowball methods with your own rates.Retirement Savings CalculatorSee what your savings become by retirement, the monthly income they support, how that compares with the 4% rule, and what Social Security covers.Student Loan Repayment CalculatorCompare every federal repayment plan side by side: monthly payment, total interest, how long it runs, what gets forgiven and the tax bill that comes with it.Home Equity Loan CalculatorWork out how much you could borrow against your home: your equity, the loan-to-value ceiling and the monthly payment on a HELOC or home equity loan.Rent vs Buy CalculatorCompare renting with buying the same home over the same period — mortgage, taxes, maintenance, opportunity cost — and find your break-even year.Debt Consolidation CalculatorSee whether folding card balances into one loan saves money: compare the blended card rate with the loan rate, and weigh term against interest.ROI CalculatorThe return on an investment in three ways: total return, the annualized rate solved from your exact cash flows, and a benchmark comparison.
Converters
Category page →Currency ConverterConvert between 162 currencies at the mid-market rate, with the inverse rate, a typical bank spread, and the quote date and source shown.Unit ConverterConvert length, weight, temperature, area, volume, speed, data and time as you type, computed from the exact international definitions.
Web & Network
URL, query string, HTTP and front-end debugging tools.
1 toolImages & Media
Image compression, format conversion and media processing tools.
4 toolsDesign & Icons
Category page →Favicon GeneratorGenerate a favicon.ico plus 16, 32, 64 and 128 px PNG icons from a letter, initials or an image. Preview them in a real browser tab, then download the set.CSS Gradient GeneratorBuild a CSS linear or radial gradient visually: place colour stops, set the angle, alpha and position, then copy the CSS or a Tailwind class.Color Palette GeneratorType a base colour to get complementary, analogous, triadic or monochrome schemes. Every swatch shows HEX, RGB and HSL — copy any value in one click.
Date & Time
Timestamp, timezone and date calculation tools.
1 toolEncoding & Escaping
Escape, unescape and encode text and structured data — JSON string escaping, Base64 and character encoding, all in your browser.
3 toolsEncoding & Escaping
Category page →Query String to JSONConvert a URL query string to JSON and back, preserving repeated keys as arrays and showing how plus signs and percent-encoding differ. Runs locally.JSON Escape and UnescapeEscape text into a valid JSON string literal and unescape it back, and see why hand-writing escapes breaks on control characters. Runs locally.Base64 in JSONEncode and decode Base64 in the browser, including URL-safe Base64 and the payload section of a JWT. Runs locally; Base64 is encoding, not encryption.
Documents & Files
Merge, split and rearrange PDF documents in your browser — the file is read locally and never uploaded.
1 toolSecurity & Privacy
Generate and check credentials, and other privacy-first tools that run entirely in your browser.
1 tool