Free Online Tools 2026
Generators and utilities that run entirely in your browser. No sign-up, no tracking. The full German edition includes 227 tools; switch to German.
Available tools
QR Code Generator
Create free QR codes for URLs, Wi-Fi, contact cards and plain text. No sign-up, runs fully in your browser.
Password Generator
Generate strong, random passwords with configurable length and character sets. Cryptographically secure (Web Crypto API).
UUID v4 Generator
Create RFC 4122 compliant version-4 UUIDs individually or in bulk. Client-side, no server round-trip.
Base64 Encoder / Decoder
Encode and decode Base64 strings instantly. Supports UTF-8 and URL-safe variants.
Lorem Ipsum Generator
Generate classic Lorem Ipsum placeholder text in words, sentences or paragraphs. One click to copy.
Word & Character Counter
Count words, characters, sentences, paragraphs and reading time. Live, in-browser.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case.
URL Slug Generator
Turn any title into a clean, SEO-friendly URL slug. Handles diacritics and special characters.
Text Diff Tool
Compare two blocks of text side by side with inline highlighting.
Duplicate Line Remover
Strip duplicate lines from any list. Preserve order or sort.
Line Break Remover
Remove hard line breaks from pasted text — clean up PDF copies and wrapped content.
Alphabetical Sorter
Sort lines alphabetically, numerically or by length. Unicode-aware.
Reverse Text
Reverse text by character, word or line. Emoji-safe.
Nano ID Generator
Generate URL-safe, compact random IDs. Configurable length and alphabet.
Markdown to HTML
Convert Markdown to clean HTML. Supports GFM tables, code blocks, task lists.
JSON Formatter & Validator
Pretty-print, minify and validate JSON. Jump-to-error, configurable indent.
JSON to CSV Converter
Turn JSON arrays into CSV tables with header row. Handles nested objects.
CSV to JSON Converter
Convert CSV files into a JSON array with type inference.
ULID Generator
Generate Universally Unique Lexicographically Sortable Identifiers.
Regex Tester
Test JavaScript regular expressions with live highlighting and replace preview.
JWT Decoder
Decode JSON Web Tokens — header, payload, signature. Expiry checks.
URL Encoder & Decoder
Percent-encode and decode URL components. Side-by-side view.
HTML Entity Encoder
Convert between HTML special characters and their entity equivalents.
SHA-256 Hash Generator
Compute SHA-256 hashes of text or files. Web Crypto, nothing uploaded.
UUID v7 Generator
Generate RFC 9562 UUID v7 — time-ordered 128-bit IDs.
Wi-Fi QR Code Generator
Create a QR code that auto-connects phones to your Wi-Fi network.
vCard QR Code Generator
Turn contact details into a scannable QR code.
Email QR Code Generator
Pre-filled email draft via QR scan.
Plain Text QR Code
Encode plain text — notes, codes, references — as a QR.
Geo Location QR Code
QR code with latitude/longitude — opens in any maps app.
Code 128 Barcode
Generate Code 128 barcodes for logistics and shipping.
EAN-13 Barcode
Generate EAN-13 barcodes with auto-calculated check digit.
Data Matrix Generator
Compact 2D codes for small-part marking and pharma.
Hex to RGB Color Converter
Convert between HEX, RGB, HSL, HSV, CMYK with live preview.
Color Palette Generator
Build harmonious palettes from a base colour — complementary, triadic, tetradic.
CSS Gradient Generator
Build linear, radial and conic CSS gradients visually.
CSS Box Shadow Generator
Design CSS shadows with sliders. Layer multiple shadows for depth.
CSS Border Radius Generator
Per-corner and elliptical border-radius editor with live preview.
Placeholder Image Generator
Generate placeholder images in any size/colour as PNG or SVG.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates.
Timezone Meeting Planner
Find overlapping working hours across timezones.
Cron Expression Generator
Build cron schedules visually with next-run preview.
Cron Expression Reader
Translate cron strings into plain English.
Countdown URL Generator
Create a shareable countdown link to any future date.
Diceware Passphrase Generator
Memorable passphrases from the Diceware word list.
TOTP Secret Generator
Generate Base32 TOTP secrets and otpauth QR codes for 2FA apps.
PIN Generator
Generate random numeric PINs with weak-pattern filter.
HMAC Generator
Compute HMAC signatures for webhooks and API requests.
cURL Command Generator
Build cURL commands via a form — method, headers, body, auth.
Compound Interest Calculator
See how savings grow with compound interest.
Loan EMI Calculator
Calculate equated monthly instalments with full amortisation schedule.
Percentage Calculator
Solve any percentage problem — of, change, increase/decrease.
Discount Calculator
Calculate sale prices, savings and stacked discounts.
Tip Calculator
Calculate restaurant tips and split bills across diners.
Currency Converter
Convert between world currencies at ECB reference rates.
Why this site?
Every tool runs client-side. Input data never leaves your browser. No ads, no affiliate links, no newsletters. The full German version covers 128 calculators (tax, salary, loans, pension) and 100 generators.
More English tools are being added — this is the first batch. Suggestions? See the German site for the complete catalog.
Browser-based developer & productivity tools
Everything below runs locally in your browser. No uploads, no accounts, no hidden API calls. Pick a category to jump in.
Text & typography
Clean up copy before it ships. The word counter tracks length against SEO and social limits, case converter switches between camelCase, snake_case and Title Case, slug generator turns titles into URL-safe strings. Diff two drafts with text diff, strip noise via duplicate line remover, line-break remover or alphabetical sorter. Need filler? Lorem Ipsum and Markdown → HTML close the loop.
Developer utilities
Format and validate without pasting into random web forms. JSON formatter, JSON → CSV, CSV → JSON, regex tester and JWT decoder cover the daily grind. For identifiers grab a UUID v4, UUID v7, ULID or NanoID. Encode payloads with Base64, URL encoder, HTML entity encoder, SHA-256 or HMAC. Debug requests via curl command generator.
QR codes & barcodes
Print-ready codes without watermarks. Generic QR code plus dedicated variants for Wi-Fi, vCard, email, plain text and geo coordinates. Legacy linear formats: Code 128, EAN-13 and 2D Data Matrix.
Design & CSS
Speed up front-end work. Convert colors with HEX → RGB, build harmonies in the palette generator, craft gradients via CSS gradient generator, shadows with box-shadow and curves through border-radius. Mock layouts with the placeholder image generator.
Time, scheduling & security
Work across zones with the timezone meeting planner, parse epochs via Unix timestamp converter, write jobs with cron generator / cron reader, and share deadlines via countdown URL. Harden accounts with strong passwords, Diceware passphrases, PINs and TOTP secrets.
Finance & math
Quick number crunching without a spreadsheet: compound interest, loan EMI, percentage, discount, tip split and currency converter. For deeper German-language calculators (income tax, mortgage, pension) see the German catalog.
Privacy first
All computation happens in your browser. No server logging, no analytics tied to inputs, no third-party scripts on tool pages. Every result is reproducible — open DevTools and inspect the source if you want proof.