Free Online Tools Fast, Private, Browser-Based

Acceleration Calculator

Free online acceleration calculator. Process data instantly in your browser. No upload, no signup, fully private.

Acreage Calculator Converter

Free online acreage calculator converter. Process data instantly in your browser. No upload, no signup, fully private.

Acres Per Hour Calculator

Free online acres per hour calculator. Process data instantly in your browser. No upload, no signup, fully private.

Acres to Square Feet Converter

Free online acres to square feet converter. Process data instantly in your browser. No upload, no signup, fully private.

Acronym Generator

Free online acronym generator. Process data instantly in your browser. No upload, no signup, fully private.

Activity Coefficient Calculator

Free online activity coefficient calculator. Process data instantly in your browser. No upload, no signup, fully private.

Add Line Numbers

Free online add line numbers. Process data instantly in your browser. No upload, no signup, fully private.

Add Page Numbers to PDF

Free online add page numbers to pdf. Process data instantly in your browser. No upload, no signup, fully private.

Add Time Calculator

Free online add time calculator. Process data instantly in your browser. No upload, no signup, fully private.

Add Watermark to Image Online Free

Free online add watermark to image online free. Process data instantly in your browser. No upload, no signup, fully private.

Add Watermark to PDF

Free online add watermark to pdf. Process data instantly in your browser. No upload, no signup, fully private.

AdSense Earnings – Estimate Your Google AdSense Revenue

Free online adsense earnings – estimate your google adsense revenue. Process data instantly in your browser. No upload, no signup, fully private.

AES-256 Ver-/Entschlüsseln Online - Kostenlos, Im Browser

Free online aes-256 ver-/entschlüsseln online - kostenlos, im browser. Process data instantly in your browser. No upload, no signup, fully private.

AES Text Encrypter / Decrypter

Free online aes text encrypter / decrypter. Process data instantly in your browser. No upload, no signup, fully private.

Affiliate Marketing

Free online affiliate marketing. Process data instantly in your browser. No upload, no signup, fully private.

AFR Calculator

Free online afr calculator. Process data instantly in your browser. No upload, no signup, fully private.

🎂

Age Calculator

Calculate exact age in years, months, and days from a birth date. Also shows total days lived.

Age on Other Planets Calculator

Free online age on other planets calculator. Process data instantly in your browser. No upload, no signup, fully private.

Alim GPA Calculator

Free online alim gpa calculator. Process data instantly in your browser. No upload, no signup, fully private.

All Free Online Tools

Free online all free online tools. Process data instantly in your browser. No upload, no signup, fully private.

Alle Tools an einem Ort

Free online alle tools an einem ort. Process data instantly in your browser. No upload, no signup, fully private.

Alle tools op één plek

Free online alle tools op één plek. Process data instantly in your browser. No upload, no signup, fully private.

Allele Frequency Calculator

Free online allele frequency calculator. Process data instantly in your browser. No upload, no signup, fully private.

Alligation Calculator

Free online alligation calculator. Process data instantly in your browser. No upload, no signup, fully private.

Browse all 1148 tools by category →

Browse by Category

⚡

Productivity Tools

Pomodoro timer, task list, note pad and workflow helpers.

229 tools

🧮

Calculator Tools

Math, percentage, BMI, loan, scientific and specialty calculators for everyday use.

213 tools

💻

Developer Tools

JSON, Base64, hash, JWT, regex, code formatter and other utilities for software developers.

141 tools

📝

Text Tools

Count words, convert case, remove duplicates, sort lines and transform text quickly.

81 tools

⏰

Date & Time Tools

Unix timestamp converter, timezone converter, date difference and calendar utilities.

72 tools

💰

Finance Tools

Currency converter, loan calculator, interest calculator and financial utilities.

69 tools

🎲

Generator Tools

UUID, lorem ipsum, placeholder data, random number and custom generators.

58 tools

📄

PDF Tools

Merge, split, compress, convert and manipulate PDF files locally. Your PDFs never leave your device.

50 tools

🖼️

Image Tools

Resize, compress, convert, crop, rotate and edit images entirely in your browser. No upload required.

48 tools

🔄

Converter Tools

Convert between units, formats, number bases, encodings and file types.

40 tools

🔐

Crypto & Encoding Tools

Base64, URL encode/decode, AES, hex, JWT and encoding conversions.

30 tools

🎨

Color Tools

HEX, RGB, HSL, CMYK conversion, color picker, palette generator and contrast checker.

25 tools

💪

Health & Fitness Tools

BMI, BMR, calorie, pace and health-related calculators.

22 tools

🔒

Security Tools

Password generator, hash verifier, entropy checker and other security utilities.

19 tools

📈

SEO Tools

Meta tag generator, sitemap validator, robots checker, SERP preview and SEO analysis.

15 tools

🎉

Random & Fun Tools

Dice roller, coin flip, random picker, trivia and entertainment tools.

9 tools

🤖

AI Utilities

Token counter, prompt template, JSONL formatter and AI workflow helpers.

5 tools

🔊

Audio Tools

Audio converter, volume normalizer, waveform viewer and audio utilities.

5 tools

📢

Marketing Tools

UTM builder, email validator, keyword density and marketing utilities.

4 tools

📚

Education Tools

GPA calculator, grade converter, study timer and academic utilities.

3 tools

📱

QR & Barcode Tools

Generate and decode QR codes, barcodes and other 2D codes locally.

3 tools

👥

Social Media Tools

Character counter for posts, image resizer for platforms, hashtag generator.

3 tools

📁

File Tools

File hash, rename, format detection, metadata viewer and general file utilities.

2 tools

🏠

Everyday Life Tools

Tip calculator, unit converter, weather helper and daily utilities.

1 tool

🎬

Video Tools

Video converter, trimmer, metadata viewer and video utilities.

1 tool

💼

Business Tools

Invoice generator, tax calculator, ROI and business planning utilities.

0 tools

🌐

Network Tools

IP lookup, DNS query, WHOIS, SSL check, HTTP headers and URL availability diagnostics.

0 tools

Guides & Tutorials

How to Encode and Decode Base64: A Complete Guide

Learn what Base64 encoding is, how it works, when to use it, and how to encode and decode Base64 in your browser — no tools or signup needed.

Color Formats Explained: HEX, RGB, and HSL

Understand the three most common web color formats — HEX, RGB, and HSL — how each represents color, when to use which, and how to convert between them.

reference

DNS Records Explained: A, AAAA, MX, TXT, CNAME, NS

A complete reference guide to DNS record types — A, AAAA, MX, TXT, CNAME, and NS — with examples, use cases, and how to look them up.

Hashing Algorithms Explained: MD5, SHA-1, SHA-256, SHA-512

Understand how cryptographic hash functions work, the differences between MD5, SHA-1, SHA-256, and SHA-512, and which to use for integrity checks vs password storage.

JSON Formatting Best Practices: Readable, Valid, and Efficient

Understand the conventions for formatting JSON: indentation, key ordering, minification, trailing commas, and when to pretty-print vs minify.

Understanding JSON: A Beginner's Guide to Formatting and Validation

Learn what JSON is, its syntax rules, common data types, and how to format and validate JSON data using free online tools.

How to Decode a JWT and Inspect Its Claims Safely

Learn the three-part structure of a JSON Web Token, how to decode the header and payload without verifying, and why decoding is not the same as trusting.

comparison

Markdown vs HTML: Which Should You Use for Content?

Compare Markdown and HTML across readability, expressiveness, learning curve, use cases, and rendering — and learn when to pick each (or both).

problem-solving

Password Security: How to Generate, Store, and Audit Strong Passwords

Solve the most common password security problems: generating strong passwords, hashing them correctly, avoiding reuse, and auditing existing credentials.

reference

Regular Expressions Cheat Sheet: Syntax, Flags, and Common Patterns

A complete reference for regular expression syntax: metacharacters, character classes, quantifiers, anchors, groups, flags, and ready-to-use patterns for emails, URLs, dates, and more.

How to Convert Unix Timestamps to Human-Readable Dates

Learn what a Unix timestamp is, how to convert it to a human-readable date and back, and how to handle time zones correctly when working with epoch time.

reference

Unit Conversion Reference: Length, Mass, Temperature, and Area

A complete reference of conversion factors for length, mass/weight, temperature, and area, with exact formulas and worked examples for each.

How to Encode and Decode URLs: A Complete Guide

Learn what URL encoding (percent-encoding) is, why it is required, and how to encode and decode URLs in your browser — no signup, fully private.

comparison

UUID v1 vs v4 vs v5: Which Version Should You Use?

Compare UUID versions 1, 4, and 5: how each is generated, their trade-offs in uniqueness, ordering, and determinism, and which to pick for your use case.