Free Online Utility Tools

Upload and view any text-based file in the browser with line numbers, word count, and line wrap.

Extract email addresses from pasted text, HTML, or source code. Remove duplicates and export a clean list as TXT or CSV.

Count words, characters (with and without spaces), sentences, and paragraphs in real time. Paste any text and get instant stats. Free.

Convert text between UPPERCASE, lowercase, Title Case, snake_case, kebab-case, camelCase, and more.

Generate realistic mock data — names, emails, addresses, companies, and more — as JSON or CSV for testing and prototyping.

Encode any file to a Base64 string, or decode a Base64 string back to a downloadable file.

Convert Excel spreadsheets (.xlsx, .xls) to CSV with sheet selection and instant preview.

Convert a CSV file or pasted CSV data to a downloadable Excel (.xlsx) spreadsheet.

Combine multiple PDF files into a single document. Reorder files before merging. Runs entirely in your browser — files are never uploaded. Free.

Extract a page range from a PDF, or split every page into its own PDF file, downloaded as a zip. Free, runs entirely in your browser.

Visually rotate, delete, and reorder the pages of a PDF, then save the result. See a thumbnail of every page before you export. Free, all in your browser.

Shrink a PDF's file size by re-compressing its pages at a chosen resolution and quality. Best for scanned or image-heavy PDFs. Free, runs in your browser.

Upload an image to extract its dominant colors as a palette. Export as HEX list, CSS variables, Tailwind config, or JSON.

Generate a modular type scale from any base size and ratio. Choose from Perfect Fourth, Golden Ratio, and more — get px, rem, CSS variables or Tailwind config output. Free.

Convert font sizes between pt (print), px (screen), and rem. Set your root font size and see all three equivalents instantly. Includes a reference table of 17 common print sizes. Free.

Convert an RGB color to HSL instantly. Paste any color in any format and get HEX, RGB, RGBA, HSL, and HSLA all at once with one-click copy.

Build and sign a JWT from a custom header and payload using HS256, HS384, or HS512. Runs entirely in your browser.

Paste any cron expression to get a plain-English explanation, a field-by-field breakdown, and its next 5 run times.

Verify a file's integrity by checking its hash against an expected checksum. Supports SHA-256, SHA-1, MD5, and more. Runs in your browser — nothing uploaded. Free.

Paste a JSON Web Token to decode and inspect its header, payload, and expiry — entirely in your browser.

Instantly see your public IP address, country, region, city, ISP, and connection type. No app needed — your IP information loads automatically. Free.

See your exact screen resolution, browser viewport size, device pixel ratio, and orientation. Helpful for responsive design and CSS media query debugging. Free.

Convert a date and time between any two time zones. See the offset difference and local times side by side.

Convert a Unix timestamp to a human-readable date, or convert a date back to a Unix timestamp.

Calculate what percent of a number is, find a percentage change between two values, or determine what percent one number is of another. Three calculators in one. Free.

Simplify any ratio to its lowest terms, solve proportions, or find the missing value in A:B = C:X. Enter any three values to solve for the fourth. Free.

Calculate your exact age in years, months, and days from any date of birth. Also shows your next birthday and how many days until it. Free, instant results.

Count the exact number of days, weeks, and months until any future date. Great for countdowns, deadlines, and event planning. Updates in real time. Free.

Calculate your 2025 federal income tax by bracket. Enter gross income and filing status to see your taxable income, tax owed in each bracket, effective rate, and marginal rate. Free.

Calculate your take-home pay after federal income tax, state tax, Social Security, Medicare, 401(k), and health insurance deductions. Supports all pay frequencies. Free.

Compare the after-tax retirement value of a Roth IRA vs. a Traditional IRA based on your current and retirement tax rates, contribution amount, and years of growth. Free.

Calculate your monthly payment, total interest, and payoff timeline for any student loan. See how much an extra monthly payment saves in interest and time. Free.

Calculate your monthly burn rate, net burn, and cash runway in months. See when you'll run out of money and how much you need to raise to hit a target runway. Free.

Calculate the profit or loss on your ad campaigns. Enter spend, CPC, conversion rate, average order value, and gross margin to see ROAS, ROI, CAC, and break-even thresholds. Free.

Calculate your conversion rate from visitors and conversions, see total value and value per visitor, and model the revenue impact of improving your CVR by 10%, 25%, 50%, or 100%. Free.

Calculate PayPal fees for Goods & Services, invoicing, and QR code payments, and find the gross amount to charge to receive a net target.

Calculate monthly and annual cash flow per unit (door) for a multi-unit rental property.

Calculate Debt Service Coverage Ratio (DSCR) to evaluate whether a property's income covers its debt obligations.

Calculate Gross Rent Multiplier (GRM) to quickly compare rental properties by income potential relative to price.

Calculate the vacancy rate for a rental property and estimate the monthly and annual income lost to empty units.