Free online tools
92 tools that run entirely in your browser. Plan a website, name a business, check your SEO, or format code. Free with no signup.
Plan and launch with BYOB
Turn an idea into a build-ready plan, estimate costs, and check you are ready to ship.
AI Website Prompt Builder
Answer a few questions and get a clear, copy-ready prompt that turns your idea into a website with BYOB.
Website Cost Calculator
Estimate what a website really costs with an agency or freelancer versus building it yourself with BYOB.
BYOB Credit Estimator
Pick the site you want to build and see roughly how many BYOB credits it takes and which plan fits.
Website Launch Checklist
Work through a 12-point pre-launch checklist and get a readiness score before you publish.
Tech Stack Picker
Answer five questions about auth, data, and payments and get a recommended stack for your project.
Startup Idea Validator
Score your site idea across demand, competition, and monetization with an 8-question assessment.
Start and run your business
Names, invoices, pricing math, codes, and legal drafts for founders and freelancers.
Business Name Generator
Enter a keyword and get instant business name ideas you can shortlist and copy.
Slogan and Tagline Generator
Generate catchy slogans and taglines from your business name and niche in one click.
Domain Name Ideas
Turn keywords into short, brandable domain-style ideas with common extensions.
Free Invoice Generator
Fill in your business, client, and line items to preview a clean invoice you can print or save as PDF.
Freelance Rate Calculator
Enter your income goal, billable hours, and expenses to find the hourly rate you should charge.
Profit Margin Calculator
Enter cost and price to see margin, markup, and profit per sale instantly.
QR Code Generator
Paste any link or text to create a scannable QR code you can download as a PNG.
UTM Link Builder
Build tracked campaign links with source, medium, and campaign fields, with live validation.
Privacy Policy Generator
Answer simple questions to draft a basic privacy policy you can copy into your site.
Terms of Service Generator
Draft simple terms of service for your website or app from a short questionnaire.
EMI Calculator — Monthly Loan Payments
Enter loan amount, interest rate, and term to see your monthly EMI, total interest payable, and a clear year-by-year repayment schedule instantly online.
SIP Calculator — Compound Growth Planner
Enter a monthly amount, period, and expected return to project maturity value, total invested, and gains with a visual growth chart, free in your browser.
GST Calculator — Add or Remove GST Fast
Enter an amount and GST slab to add or remove tax, with CGST plus SGST for intra-state sales and IGST for inter-state sales, all computed instantly online.
Salary Calculator — CTC to Take-Home Pay
Enter your CTC, effective tax rate, and deductions to see monthly take-home pay with a simple visual breakdown of each slice, free, private, and instant.
Percentage Calculator — Fast Percent Math
Solve X percent of Y, find what percent X is of Y, or measure percent change between two values with the formula shown, all with instant answers. Free forever.
Email Signature Generator — Pro Sign-Off
Enter your name, role, company, and links to preview a clean email signature, then copy it as HTML or plain text in one click, private and no signup needed.
Free Quote Generator — Client Estimates
Add your business, client, line items, tax, and discount to preview a clean quote you can print, save as PDF, or share, free with no signup. Try it now.
Runway Calculator — Startup Cash Planner
Enter cash on hand, monthly burn, and revenue to see your runway in months, break-even hint, and scenario table instantly, free with no signup needed.
Meeting Cost Calculator — Real Price Tag
Enter attendees, average hourly cost, and duration to reveal what each meeting costs, plus the yearly total and a shareable line, free with no signup needed.
Buyer Persona Builder — Know Your Customer
Answer five short questions about goals, pains, and objections to generate a one-page buyer persona you can copy or download as Markdown. Free, no signup.
Take-Home Pay Estimator — Net Salary by Country
Pick a country, enter gross annual pay, and see estimated net, monthly take-home, and effective rate from simplified 2025/26 brackets. Free, private, online.
INSS + FGTS Calculator — Brazil Net Pay
Enter monthly gross in reais to see INSS by 2026 progressive brackets, employer FGTS at 8%, and the 40% dismissal fine. Free, private, instant online now.
Mexico Payroll Calculator — ISR + Aguinaldo
Enter monthly gross in pesos for a simplified ISR estimate, proportional aguinaldo for days worked, and basic finiquito parts. Free, private, fast online now.
CPF Calculator Singapore — Contributions
Enter monthly SGD wages and your age band to split 2026 CPF into employee and employer shares under the S$8,000 ceiling. Free, private, instant online.
GST Singapore Calculator — Add or Remove 9%
Enter a Singapore dollar amount to add or remove 9% GST and see net, tax, and gross split clearly. Free, private, instant. Compares with India GST well.
Mortgage Calculator — Monthly P&I + Schedule
Enter price, down payment, rate, and term to see monthly P&I, total interest, payoff total, plus a yearly balance table. Free, private, instant online now.
VAT Calculator — Add or Remove EU VAT
Add or remove VAT on any European price in seconds. Pick your country rate, type the amount, and copy the full net, VAT, and gross breakdown free online.
Bill Splitter — Fair Shares With Tip and Tax
Split any restaurant bill fairly in seconds. Add the tip percent and tax, set the party size, and copy a clear per-person share with a full breakdown.
Age Calculator — Exact Age in Years, Months, Days
Find your exact age from any birthdate in seconds. See years, months, days, total days lived, the weekday you were born, plus a birthday countdown free.
Unit Converter — Length, Weight, Temperature
Convert length, weight, and temperature instantly online. Enter a value, pick the from and to units, and copy the exact result with its formula shown.
Fuel Trip Calculator — Road Trip Cost Estimator
Estimate any road trip fuel cost in seconds online. Enter distance, consumption, and fuel price to see the trip total plus cost per 100 km to copy free.
BMI Calculator — Body Mass Index and Healthy Range
Check your body mass index from height and weight in seconds. See your BMI, WHO weight band, and the healthy range for your height to copy free online.
Build and rank your website
Meta tags, previews, favicons, colors, and images that make your site look right and rank.
Meta Tag Generator
Write your title and description with live length checks, then copy clean HTML meta tags.
Social Card Preview Checker
Preview how your page looks when shared on Google, X, LinkedIn, and Facebook before you publish.
Robots.txt Generator
Build a correct robots.txt with allow and disallow rules for common bots, ready to copy.
Sitemap Validator
Paste sitemap XML to check it parses, count URLs, and spot common errors before submitting.
Favicon Generator
Upload any image to preview and download favicon sizes for browsers, iOS, and Android.
Color Palette Generator
Generate harmonious color palettes with click-to-copy hex codes and contrast guidance.
Color Contrast Checker
Check any two colors against WCAG contrast ratios for normal and large text.
CSS Gradient Generator
Design linear gradients visually and copy production-ready CSS in one click.
Box Shadow Generator
Tune CSS box shadows with sliders and copy the result for cards, buttons, and modals.
Font Pairing Preview
Preview heading and body font combinations with real sample text and sizes.
Image Compressor and Resizer
Compress and resize images in your browser to cut page weight. Nothing is uploaded.
SVG to PNG Converter
Paste SVG code or upload an SVG file and download crisp PNGs at any size.
Schema Markup Generator
Create valid JSON-LD structured data for FAQ, Article, Local Business, and Product pages in your browser, then copy or download the markup for your website.
XML Sitemap Generator
Turn a pasted list of page URLs into a clean sitemap.xml file with change frequency and priority set, ready to download and submit to search engines today.
Readability Analyzer
Paste any text to measure Flesch Reading Ease, grade level, and word counts in seconds, then see exactly which long sentences to simplify for your readers.
Headline Analyzer
Score any headline from 0 to 100 with clear pass and fail checks on length, numbers, power words, and emotion, plus concrete fixes you can try next today.
AI Search Visibility Grader
Answer 10 quick yes or no checks about your most important page to grade its AI search readiness, find the weakest areas first, and plan your next fixes.
Accessibility Checker
Enter any page URL to audit its title, headings, image alt text, form labels, button names, and language, with a weighted score and plain-language fix list.
OG Image Maker — Social Share Card Studio
Design a crisp 1200x630 social share card in seconds. Type your title, pick colors and style, preview the result live, then download a ready PNG free.
Text to Favicon — Letter Icon Generator
Turn one or two letters into a crisp app icon in seconds. Pick a shape and colors, preview it at every size, then download 180, 192, and 512 PNGs free.
CSS Button Generator — Style and Copy
Style the perfect button in seconds. Tune padding, corners, and colors, preview the hover state live, then copy clean CSS with normal and hover rules free.
Border Radius Generator — Corner Studio
Shape perfect corners in seconds. Drag sliders for each corner, link axes for symmetry, preview the box live, then copy the exact border-radius shorthand free.
Text Shadow Generator — Layered Depth
Add depth to any headline in seconds. Stack up to three shadows, tune each layer live on a light or dark backdrop, then copy clean text-shadow CSS free.
Organic Blob Shape Maker
Shape smooth organic blobs with a live gradient preview, then copy the production-ready border-radius CSS or download it for your project. Free, no signup.
Easing Curve Visualizer
Compare cubic-bezier easing curves with a live animated dot preview, then copy the exact CSS timing value or a Svelte transition snippet. Free, no signup.
Type Scale Generator
Build a balanced type scale from your base size and ratio, preview every step at its real rendered size, and copy the CSS variables. Free, no signup needed.
CSS Loader Generator
Create lightweight dependency-free CSS loaders with your own size, color, and speed, preview the motion live, and copy the keyframes. Free, no signup needed.
Glassmorphism Card Generator
Design a frosted-glass card with live blur, transparency, and border controls over demo backgrounds, then copy the backdrop-filter CSS. Free, no signup needed.
Everyday developer utilities
Formatters, encoders, testers, and generators that run entirely in your browser.
JSON Formatter and Validator
Paste JSON to validate it, see errors with line numbers, and format or minify it.
Regex Tester
Test regular expressions against sample text with live match highlighting and a cheatsheet.
Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 back to text instantly in your browser.
URL Encoder and Decoder
Encode URLs and query strings or decode percent-encoded URLs back to readable text.
JWT Decoder
Paste a token to inspect its header and payload. Everything stays in your browser.
UUID Generator
Generate version 4 UUIDs in bulk and copy them as text, JSON, or comma lists.
Strong Password Generator
Create strong random passwords with length and character controls plus an entropy estimate.
Cron Expression Explainer
Paste a cron expression to read what it means in plain English with the next run times.
Markdown Preview
Write Markdown on the left and see a live preview on the right, then copy the result.
HTML Entity Encoder
Escape HTML special characters or decode entities back to plain text.
Timestamp Converter
Convert Unix timestamps to readable dates and back, in local time and UTC.
Word and Character Counter
Count words, characters, sentences, and reading time as you type.
CSS Minifier
Paste CSS to strip comments and whitespace and see how many bytes you save.
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences, or words for mockups and layouts.
URL Slug Generator
Turn any headline into a clean, lowercase URL slug with accents stripped and words joined by dashes. Add a date stamp, cap the length, then copy the result.
SHA Hash Generator
Paste text to compute its SHA-256, SHA-512, and SHA-1 fingerprints instantly in your browser. One-way hashes verify file and download integrity in seconds.
Text Diff Checker
Paste two versions of any text to see line-by-line additions and removals highlighted instantly side by side, with change counts and a copyable summary.
Color Converter HEX RGB HSL
Enter any HEX color or pick one to see matching RGB, HSL, and HSV values with a live swatch, instant one-click copying, plus lighter and darker shades.
Aspect Ratio Calculator
Enter a width and height to get the simplified aspect ratio, or scale any ratio to a new size. Includes one-click presets for common video and image frames.
IBAN Validator and Checker
Paste any IBAN to verify its mod-97 checksum and exact country length, then read the parsed country code, BBAN, bank hint, and spaced format in your browser.
Brazil CPF Validator
Type a Brazilian CPF with or without punctuation to verify its two check digits, copy the formatted number, or generate a valid test-only example locally.
Brazil CNPJ Validator
Type a Brazilian CNPJ to verify its two check digits and copy the formatted version, or generate a valid test-only example for developers in your browser.
EU and UK VAT Number Validator
Choose a European country or the UK, enter a VAT number to check its format and national checksum where defined, then copy the prefixed result in your browser.
Merge PDF Files Online
Combine up to 20 PDF files into a single document in your browser. Reorder files, merge in one click, and download the result. Files never leave your device.
Split PDF by Page Ranges
Pull exactly the pages you need out of any PDF. Type ranges like 1-3, 5, extract them in one click, and download a new file. Everything stays in your browser.
PDF Page Counter
Count the pages in any PDF instantly, see its file size and version, and copy a short summary. Runs entirely in your browser. Files never leave your device.
Turn the output into a real website
Describe your idea once. BYOB plans the pages, writes the code, and deploys it for you.