Free tools
37 online tools for coding, design, marketing and test data. They run entirely in your browser: nothing you type or upload ever leaves your computer.
Development and data formats
Format, encode, convert and validate data.
JSON validator and formatter online
Validate, beautify, minify and sort JSON online. Shows the exact error line and column. Free, and your data never leaves your browser.
Open toolBase64 encode and decode online
Encode and decode Base64 text with full UTF-8 support (accents, emojis), URL-safe variant, and file or image to Base64 conversion.
Open toolURL encode and decode online
Encode and decode URLs and query parameters (percent-encoding), and break a URL down into protocol, host, path and parameters.
Open toolUUID generator online (v4, v7 and ULID)
Generate UUID v4, time-ordered UUID v7 and ULID, one or thousands at a time. Uppercase, no hyphens and a UUID validator.
Open toolMD5, SHA-1, SHA-256 and SHA-512 hash generator
Compute the MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hash of text or a file, in hex or Base64. Ideal for verifying downloads.
Open toolJWT decoder online
Decode a JSON Web Token and read its header, payload, and issued-at and expiry dates in a readable format. The token never leaves your browser.
Open toolHTML entities encoder and decoder
Escape special characters to HTML entities (< > & ") or turn entities back into text. Optional encoding of non-ASCII characters.
Open toolRegular expression (regex) tester online
Test regular expressions live: match highlighting, capture groups, flags and replace. Includes ready-made patterns for email, URLs and more.
Open toolCompare two texts online (diff checker)
Compare two texts or files line by line and see what was added, removed or unchanged. Ideal for code, contracts and config files.
Open toolCase converter: camelCase, snake_case, kebab-case and slugs
Convert text to UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and URL slugs, all at once.
Open toolConvert CSV to JSON and JSON to CSV
Convert CSV to JSON and JSON to CSV online. Detects the delimiter (comma, semicolon or tab), handles quotes and lets you download the result.
Open toolBinary, octal, decimal and hex converter
Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36, with no size limit.
Open toolUnix timestamp (epoch) converter
Convert Unix timestamps in seconds or milliseconds to local date and time, UTC and ISO 8601, and dates back to timestamps. Live epoch clock included.
Open toolStrong password generator
Create strong random passwords with the length and characters you choose, or easy-to-remember passphrases. Includes a strength meter.
Open toolLorem Ipsum generator
Generate Lorem Ipsum placeholder text by paragraphs, sentences or words, as plain text or HTML, for mockups and designs.
Open toolWord and character counter
Count words, characters with and without spaces, sentences and paragraphs, and get the reading time. Includes social media and SEO limits.
Open toolDesign and images
Favicons, QR codes, colors and images ready for your website.
Favicon generator online
Design your website favicon with text, initials or an emoji, or create it from an image. Download favicon.ico, PNGs in every size, a manifest and HTML code.
Open toolFree QR code generator
Create free QR codes for links, text, WiFi, email or WhatsApp. Pick colors and size and download them as PNG or SVG. No expiry, no sign-up.
Open toolHEX, RGB and HSL color converter
Convert colors between HEX, RGB and HSL, pick colors with the color picker and generate a shade scale ready to copy as CSS variables.
Open toolColor contrast checker (WCAG)
Compute the contrast ratio between text and background colors and check whether it meets WCAG 2.1 AA and AAA accessibility guidelines.
Open toolCSS gradient generator
Create linear, radial and conic gradients with multiple colors, preview them live and copy the ready-to-use CSS code.
Open toolResize, compress and convert images
Shrink, compress and convert images to JPG, PNG or WebP without uploading them anywhere. Ideal for speeding up your site and meeting size limits.
Open toolMarketing and SEO
Meta tags, UTM campaigns and WhatsApp links.
SEO meta tag and Open Graph generator
Generate the title, description, Open Graph and Twitter Card tags for your page, with a Google preview and character counters.
Open toolUTM campaign URL builder
Build links with UTM parameters to track campaigns in Google Analytics: source, medium, campaign, term and content, with presets per network.
Open toolWhatsApp link generator
Create a WhatsApp link (wa.me) with your number and a pre-filled message for your website, Instagram or ads, and download its QR code.
Open toolDates, numbers and finance
Date, percentage, VAT and loan calculators.
Date calculator: days between dates, add days and age
Count the days between two dates (calendar and business days), add or subtract days, weeks, months or years, and calculate exact age.
Open toolRandom number generator and giveaway picker
Generate random numbers in a range, unique or with decimals, roll dice and flip coins, and pick winners from a list. Ideal for social media giveaways.
Open toolPercentage calculator
Find X% of a number, what percentage one value is of another, the percentage change between two numbers and prices after a markup or discount.
Open toolVAT and sales tax calculator
Add or remove VAT or sales tax from a price at any rate (20%, 21%, 10.5% or custom) and get the net amount, tax and total.
Open toolLoan and monthly payment calculator
Calculate a loan payment with a fixed installment (French) or fixed principal (German) schedule from the amount, annual rate and term, with a full amortization table.
Open toolTest data for QA
Argentine CUIT, DNI, CBU, phone numbers, cards and fake people with valid formats.
Argentine CUIT and CUIL generator and validator
Generate valid test CUIT and CUIL numbers (Argentine tax IDs for people and companies) with a correct check digit, and validate any CUIT/CUIL.
Open toolArgentine DNI test number generator
Generate random Argentine DNI (national ID) numbers in realistic ranges by age, with or without dots and with their matching CUIL. For testing and QA.
Open toolTest phone number generator
Generate test mobile and landline numbers for Argentina, Mexico, Spain, the US, Chile, Uruguay, Colombia, Brazil and Peru, in local, international and E.164 format.
Open toolArgentine CBU generator and validator
Generate 22-digit Argentine CBU bank account test numbers with valid check digits and real bank codes, and validate any CBU showing its bank.
Open toolTest credit card number generator (Luhn)
Generate Visa, Mastercard, Amex, Diners and Discover test card numbers that pass the Luhn check, with expiry and CVV. Validate any card number too.
Open toolCPF, CNPJ, RUT, CI and RUC generator and validator
Generate and validate Latin American test IDs: Brazil CPF and CNPJ, Chile RUT, Uruguay CI and Peru RUC, with correct check digits.
Open toolFake person data generator (Argentina)
Generate fictitious people with name, email, phone, DNI, CUIL, birth date and Argentine address. Export to JSON, CSV or SQL to seed your test database.
Open toolNeed a custom tool for your business?
Tell us about your case and in 30 minutes we'll give you a clear diagnosis: what's going on, what to do first and what it might cost. No strings attached.