Kostenlose Online-Dienstprogramme

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Bild-Wasserzeichen

Fügen Sie Ihren Bildern Wasserzeichen hinzu.

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Einheitenumrechner

Konvertieren Sie Länge, Gewicht, Temperatur, Volumen und mehr.

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Bildkonverter

Bildergröße ändern und in WebP, JPEG, PNG Formate konvertieren.

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BMI Rechner

Berechnen Sie Ihren Body Mass Index (BMI).

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Datumsrechner

Berechnen Sie D-Day und Datumsdifferenzen.

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Text-Dienstprogramme

Wörter und Zeichen zählen, Duplikate entfernen, Groß-/Kleinschreibung ändern und mehr.

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JSON Formatierer

Formatieren, Validieren und Minimieren von JSON-Daten. Werbefrei für Entwickler.

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Farbkonverter

Konvertieren Sie HEX, RGB, HSL, CMYK Farbformate.

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Base64 Konverter

Text in Base64 kodieren oder dekodieren.

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Regex-Tester

Testen Sie reguläre Ausdrücke in Echtzeit.

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SQL-Formatierer

Format, Beautify and Minify SQL queries.

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Favicon-Generator

Konvertieren Sie Bilder in Favicons verschiedener Größen.

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Text-Diff-Checker

Vergleichen Sie zwei Texte einfach auf Unterschiede. Hebt hinzugefügte und entfernte Teile hervor.

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Starker Passwort Generator

Erstellen Sie starke und sichere Passwörter. Passwörter werden lokal erstellt und niemals an einen Server gesendet.

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YouTube Thumbnail Downloader

Extrahieren und laden Sie YouTube-Video-Thumbnails in hoher Qualität (4K, HD) herunter. Kostenloses und einfaches Tool.

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Markdown-Editor & Vorschau

Echtzeit-Markdown-Vorschau-Tool. Schreiben Sie Markdown mühelos und sehen Sie sofort das konvertierte HTML.

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Reaktionstest

Testen Sie Ihre Reaktionszeit. Klicken Sie so schnell wie möglich, wenn der Bildschirm grün wird!

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JWT Decoder

Paste a JWT to decode its header and payload. Tokens are processed locally and never sent to a server.

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Hash Generator

Type any text to instantly compute MD5 and SHA-1/256/384/512 digests. Nothing is uploaded — all hashing runs locally.

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Unix Timestamp Converter

Convert between Unix timestamps and dates. Auto-detects seconds vs. milliseconds and shows both UTC and your local time zone.

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UUID Generator

Generate cryptographically random UUIDs locally. v4 (random) is the most common choice; v1 embeds a timestamp. Format options for hyphens, casing, and braces.

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URL Encoder / Decoder

Encode characters into percent-encoded form (e.g. space → %20) or decode them back. Use 'Component' for query values; use 'Full URL' to preserve reserved characters like : / ?.

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AI Token Counter & Cost Calculator

Estimate the token count of any text and the per-model API cost across GPT-4o, Claude Opus 4.7, Gemini 2.5, and more. Heuristic count (≈4 chars/token English, ≈1.5 chars/token CJK) — exact tokenization needs the provider API.

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MCP Server Config Generator

Generate Model Context Protocol (MCP) server configuration for Claude Desktop, Cursor, or VS Code. Pick transport, command, args, and env vars — the tool emits the correct JSON shape for each client and shows the config file path.

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AI Image Metadata Inspector

Drop or pick an image to inspect its embedded metadata. The tool reads PNG tEXt/iTXt chunks (Stable Diffusion stores prompts there), JPEG EXIF UserComment (Midjourney/DALL-E often embed details), and detects C2PA Content Credentials boxes. Files never leave your browser.

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ChatGPT → Blog Post Converter

Paste a ChatGPT (or Claude) conversation — text or exported JSON — and the tool splits it into user/assistant turns, optionally strips your prompts, and formats the assistant responses as clean Markdown ready for your blog.

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Prompt PII Scrubber

Mask sensitive data (emails, phones, SSNs, credit cards, API keys, IPs, URLs) before pasting prompts into ChatGPT, Claude, or any AI service. Runs entirely in your browser — your text never leaves the page.

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Claude.md Generator

Generate a CLAUDE.md (or any AI agent system prompt) from a simple form. Specify the project role, coding conventions, constraints, and commands; copy or download the resulting Markdown.

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Loan Calculator

Enter the loan amount, annual interest rate, and term in years to see your monthly payment, total interest paid, and a 12-month amortization preview. Standard formula for fixed-rate loans — mortgages, auto, personal.

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Compound Interest Calculator

Enter your starting principal, annual return, time horizon, compounding frequency, and optional monthly contributions to project the future value of an investment or savings account. Includes a year-by-year balance breakdown.

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Retirement Calculator

Enter your current age, target retirement age, current savings, monthly contributions, expected return, planned annual withdrawal, and life expectancy. The calculator runs an accumulation phase, then a withdrawal phase to show whether your nest egg lasts.

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Calorie & BMR Calculator

Enter your age, sex, height, weight, and activity level to get your basal metabolic rate, total daily calorie burn, and recommended targets for weight loss, maintenance, or muscle gain. Uses the Mifflin-St Jeor equation, the most accurate formula for healthy adults.

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Pregnancy Due Date Calculator

Enter the first day of your last menstrual period (LMP) and your typical cycle length. The calculator returns the estimated due date, your current pregnancy week and day, the trimester, and how many days remain until delivery. Naegele's rule plus a cycle-length adjustment.

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Body Fat Percentage Calculator

Enter your height and circumference measurements (neck, waist, and hip for women) to estimate body fat percentage with the US Navy method. The result includes a fitness-category label and the typical recommended range for your sex.

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RAG Text Chunker

Paste a long document and split it into overlapping chunks for embedding-based retrieval. Pick chunks-by-characters for predictable size or chunks-by-token-estimate for closer alignment with embedding model limits. All processing happens in your browser.

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Few-Shot Prompt Formatter

Add a system instruction and a list of input → output examples. The tool emits a clean few-shot prompt in Markdown, Anthropic-style XML tags, OpenAI messages JSON, or plain text — ready to paste into ChatGPT, Claude, or a script.

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JSON Schema Validator

Paste your JSON data and a JSON Schema. The validator checks type, required, properties, items, enum, format, pattern, and min/max constraints, and reports each failure with the JSONPath where it occurred. All processing in your browser.

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Tip Calculator

Enter the bill, pick a tip percentage (or type a custom one), and the calculator splits the total across however many people are paying. Quick buttons for 10/15/18/20/25%. Runs entirely in your browser.

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Percentage Calculator

Three common percentage operations in one place: what is X% of Y, X is what percent of Y, and percent change from X to Y. Switch modes from the dropdown — the input labels update so you don't have to remember the formula.

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Discount Calculator

Enter an original price and a discount percent — the calculator returns the final price and the dollar (or won) amount you save. Optional second discount for stacked sales (e.g., "30% off, then extra 20% at checkout").

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Sleep Cycle Calculator

Plan your sleep around 90-minute REM cycles. Enter a wake time to see when to fall asleep for 4–6 cycles, or enter a bedtime to see good wake times. The calculator adds 14 minutes for falling asleep so the suggested times match real-world sleep onset.

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Utilify

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