Tools that run in your browser .
Converters, encoders, generators and formatters, each with a reference explaining what it actually does. Nothing you type is uploaded, stored or logged: every tool computes on your own device, and they keep working with the network disconnected.
- 100% FreeNo hidden costs
- No Sign-upUse instantly
- Private & SecureEverything stays on your device
- Works OfflineMost tools work without internet
01Conversion 9 tools
Convert between different length units (meters, kilometers, miles, feet, etc.) with ease.
Number
Convert numbers between different bases (binary, decimal, hexadecimal, octal) effortlessly.
Temperature
Convert temperatures between Celsius, Fahrenheit, and Kelvin with ease.
Weight
Convert between various weight units (grams, kilograms, pounds, ounces, etc.) quickly and accurately.
Energy
Convert between different energy units (joules, calories, kWh, etc.) with instant, accurate results.
Velocity
Convert between different velocity units (m/s, km/h, mph, etc.) quickly and accurately.
Color
Convert colours between HEX, RGB, HSL, HSV, and CMYK, and check WCAG contrast.
Date
Convert Unix timestamps to dates and back, across time zones, and measure the span between two dates.
Image
Convert images between PNG, JPEG, and WebP, resize, compress, rotate, and crop them in batches.
02Encoding 3 tools
Encode or decode text using algorithms like Base64 or URL encoding for data transmission.
Encryption
Encrypt and decrypt text using popular algorithms like AES, DES, and more for secure data handling.
JWT
Decode, verify, and generate JWT tokens for secure data transmission and authentication.
03Calculation 1 tools
04Generation 4 tools
Generate unique GUIDs (Globally Unique Identifiers) for your applications with a single click.
Password
Generate strong, random passwords to enhance security with customizable length and complexity.
QR-Code
Generate custom QR codes for links, text, or contact info with ease.
Barcode
Generate custom barcodes for products, URLs, or any text with adjustable size and format options.
05Text 8 tools
Quickly format and beautify text by adjusting spacing, indentation, and case for better readability.
Generator
Generate Lorem Ipsum text or placeholder content for testing and mockups.
JSON
Format, validate, and minify JSON, sort its keys, or generate TypeScript interfaces from it.
XML
Format, indent, and minify XML, sort attributes, and check that tags are balanced.
CSV
Align CSV columns, normalize quoting, and convert between CSV and JSON.
Regex
Test regular expressions with live match highlighting, capture groups, flags, and replacement preview.
Compare
Compare two texts or files side by side, merge changes across with arrows, and export a patch.
Hex
View and edit any file byte by byte in hex, search, inspect values, and compare two files.
Frequently asked questions
Are all tools completely free?
Yes — every tool on 1TOOLS is 100% free to use with no hidden fees, subscriptions, or premium tiers. We believe useful utilities should be accessible to everyone.
Do I need to create an account?
No registration or sign-up is required. Open any tool and start using it immediately — no email address, no password, no account needed.
Is my data private and secure?
All tools run entirely in your browser. Your input data is never sent to our servers, stored, or shared with third parties. This is especially important for sensitive tasks like encryption, hashing, and password generation.
What types of tools are available?
1TOOLS currently offers tools across five categories: Conversion (units, numbers, colors, dates and timestamps, images), Encoding (Base64, URL encoding, encryption, JWT), Calculation (hash functions and HMAC), Generation (passwords, QR codes, barcodes, GUIDs), and Text (formatting, JSON, XML, CSV, regular expressions, comparing two files, Lorem Ipsum generation).
Do the tools work on mobile devices?
Yes. All tools are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
How often are new tools added?
We regularly add new tools based on user feedback and demand. If you'd like to suggest a tool or report an issue, please use the Contact page — we read every message.