Free tools that run in your browser

Small, useful tools for freelancers, developers and small business sites. No sign-up, no tracking, nothing is uploaded.

• WCAG color contrast checker

  Check text and background color contrast against WCAG 2.2 AA and AAA. Free, runs in your browser.

• Freelance hourly rate calculator

  Work out the minimum hourly rate you need from your income goal, expenses, billable hours and working weeks.

• Project quote calculator with risk buffer

  Build a fixed-price project quote from estimated hours, hourly rate, risk buffer and fixed costs.

• Margin and markup calculator

  Calculate profit margin and markup from cost and price.

• Late payment fee calculator

  Calculate a simple late fee and total due for an overdue invoice.

• Local business JSON-LD generator

  Generate schema.org LocalBusiness structured data (JSON-LD) from a simple form. Free and private.

• SRT subtitle time shifter

  Shift SRT subtitle timings earlier or later by a number of seconds. Runs in your browser; the file never leaves your computer.

• Free invoice generator (print or save as PDF)

  Make a clean invoice in your browser and print it or save it as a PDF. No sign-up, nothing uploaded.

• Website accessibility checklist (WCAG 2.2 AA)

  A plain-language WCAG 2.2 AA checklist for designers and developers. Ticks are saved in your browser.

• Word and character counter with reading time

  Count words, characters, sentences and estimate reading time as you type. Runs in your browser; nothing is uploaded.

• Aspect ratio and resolution calculator

  Find the aspect ratio of a width and height, or scale a resolution to a new width while keeping the ratio.

• HEX, RGB and HSL color converter

  Convert a color between HEX, RGB and HSL and see a preview.

• Text case converter

  Convert text to upper case, lower case, title case, sentence case, camelCase, snake_case or kebab-case.

• UTM link builder

  Build a campaign URL with UTM parameters for source, medium, campaign, term and content.

• Random password generator

  Generate strong random passwords in your browser using the Web Crypto API. Nothing is sent anywhere.

• HTML heading outline checker

  Paste HTML to see its heading outline and catch skipped levels, a missing h1 or multiple h1s. Runs in your browser.

• Vague link text checker

  Paste HTML to find links with vague or empty text like click here or read more, which fail accessibility guidance.

• Time zone converter

  Convert a date and time between time zones, including daylight saving changes.

• Hourly to salary calculator

  Convert an hourly rate to a yearly salary and back, using your hours per week and weeks per year.

• Percentage calculator

  Calculate X percent of a number, what percent one number is of another, and percentage change.

• JSON formatter and validator

  Format, indent and validate JSON in your browser. Nothing is uploaded.

• Base64 encoder and decoder

  Encode text to Base64 or decode Base64 back to text, with UTF-8 support, in your browser.

• URL encoder and decoder

  Percent-encode or decode text for use in URLs and query strings.

• Unix timestamp converter

  Convert a Unix timestamp (seconds or milliseconds) to a readable date and back.

• Regex tester

  Test a JavaScript regular expression against sample text and see every match. Runs in your browser.