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90+ Free Online Tools

Simple, fast, and reliable tools for developers, writers, and creators. No login required. All processing happens in your browser.

Browse by Category

27 tools
Text Tools

Tools for text manipulation, counting, and formatting

27 tools
Developer Tools

Essential tools for developers and programmers

6 tools
Date & Time Tools

Convert, compare, and generate dates and times

8 tools
Converters

Convert between different formats and units

7 tools
Generators

Generate random data, codes, and content

10 tools
Password Tools

Create and verify database and application passwords, hashes, and encodings

5 tools
Math Tools

Number base converters, binary operations, BCD, Gray code, Roman numerals, and number generators

EVM Tools

Free EVM and Solidity utilities: function selectors, Keccak256, ABI encode/decode, EIP-55 checksum addresses, uint256 hex conversion, and Wei/Gwei/ETH units. All run in your browser.

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developer tools
Checksum Address Generator

Convert any Ethereum address to EIP-55 checksummed format and verify checksum validity. Free, client-side — ideal for wallets, dApps, and Solidity development.

developer tools
Address Validator

Validate Ethereum addresses fast. Check 0x prefix, length, hex characters, and EIP-55 checksum. Copy normalized lowercase or checksummed output instantly.

developer tools
Keccak256 Hasher

Generate keccak256 hash online instantly. Solidity compatible hashing for Ethereum smart contract development. UTF-8 text and hex input modes.

developer tools
ABI Encoder & Decoder

Encode function calls into ABI format or decode ABI-encoded data back into human-readable form. Essential for Ethereum smart contract development.

developer tools
Event Topic Generator

Generate Ethereum event topic0 by hashing Solidity event signatures with keccak256. Supports direct signature input and ABI JSON parsing.

developer tools
Function Selector Generator

Generate the 4-byte Solidity function selector from a signature or ABI JSON using Keccak-256. Free, instant, client-side — for calldata, debugging, and EVM contract calls.

Unix Time Tools

Convert Unix timestamps to UTC, UTC to Unix, HMS durations, and cron expressions. Fast, accurate, browser-based date and time utilities.

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date tools
Unix Time to UTC

Convert Unix epoch seconds to UTC date and time (ISO 8601). Paste a timestamp or pick a date — free, instant, runs in your browser.

date tools
UTC Time to Unix

Convert UTC date and time strings into Unix timestamps in seconds since the Unix epoch.

date tools
Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Support for milliseconds and various formats.

date tools
Seconds to H:M:S

Convert a total number of seconds into hours, minutes, and seconds for easier reading and configuration.

date tools
H:M:S to Seconds

Convert a time duration expressed as hours, minutes, and seconds into a single total seconds value.

converters
Cron Expression Reader

Understand cron expressions in plain English. Validate and explain cron schedules with next run times.

Encoding Tools

Encode and decode Base64, URL components, UTF-8, hex strings, ROT13/47, and UUencoding. All processing runs locally in your browser.

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developer tools
Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 to text. Support for UTF-8 and binary data.

developer tools
URL Encoder/Decoder

Encode special characters for URLs or decode URL-encoded strings. Essential for web development.

converters
Hex ↔ Text

Decode hex to text or encode text to hex (UTF-8). A simple Ethereum log & calldata decoder tool for EVM developers. Fast, client-side processing.

text tools
UTF-8 Encode/Decode

Encode text to UTF-8 bytes (hex) or decode UTF-8 hex to text. Handle Unicode and special characters.

text tools
Uuencode / Uudecode

Encode text with Uuencode or decode Uuencoded text. Classic Unix encoding for binary in text.

password tools
ROT13 Strings

Encode or decode text with ROT13. Rotates letters by 13 positions. Self-inverse: apply twice to get original text.

Hash Tools

Compute MD5, SHA-1/256, CRC32, and more. Use the universal hash generator or batch all hashes at once. Keccak256 available for Ethereum workflows.

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developer tools
Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text. Secure hash calculator for developers.

developer tools
Calculate All Hashes at Once

Compute many hashes at once: MD2, MD4, MD5, SHA-1, SHA-2, SHA-3, RipeMD-160, CRC16, CRC32, Adler32, Whirlpool, NTLM. Client-side only.

developer tools
Calculate MD5 Hash

Compute MD5 hash from text. Client-side MD5 checksum calculator for file integrity and legacy use.

developer tools
Calculate SHA-256 Hash

Compute SHA-256 hash from text. Client-side SHA-256 checksum calculator for secure hashing.

developer tools
Calculate CRC32 Hash

Compute CRC-32 checksum from text. Client-side CRC32 calculator.

developer tools
Keccak256 Hasher

Generate keccak256 hash online instantly. Solidity compatible hashing for Ethereum smart contract development. UTF-8 text and hex input modes.

Format Converters

Convert JSON to CSV, CSV to JSON, YAML to JSON, minify JSON, and escape/unescape JSON strings. Built for developers and data workflows.

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converters
JSON to CSV

Convert JSON arrays to CSV format. Export data for spreadsheets and databases.

converters
CSV to JSON

Convert CSV files to JSON format instantly. Support for custom delimiters and header rows.

converters
YAML to JSON

Convert YAML to JSON format and vice versa. Validate YAML syntax with error highlighting.

developer tools
JSON Formatter

Format and beautify JSON data with proper indentation. Validate JSON syntax and make it readable.

developer tools
JSON Minify

Minify and compress JSON data by removing whitespace. Reduce file size for faster loading.

developer tools
JSON Escape/Unescape

Escape special characters for JSON strings or unescape them back. Handles quotes, newlines, tabs, and backslashes.

Popular Tools

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text tools
Word Counter

Free online word counter tool. Count words, characters, sentences, and paragraphs instantly. Perfect for writers, students, and SEO professionals.

text tools
Character Counter

Free online character counter. Count characters with and without spaces, words, and lines. Ideal for Twitter, SMS, and character-limited content.

text tools
Text Case Converter

Convert text to uppercase, lowercase, title case, sentence case, and more. Free online text case converter tool.

text tools
Slug Generator

Generate SEO-friendly URL slugs from any text. Remove special characters, convert spaces to hyphens, and create clean URLs.

text tools
Remove Duplicate Lines

Remove duplicate lines from text instantly. Keep unique lines, sort alphabetically, and clean up your data.

text tools
Lorem Ipsum Generator

Generate Lorem Ipsum placeholder text for your designs and mockups. Choose paragraphs, sentences, or words.

All Tools by Category

Text Tools

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Word CounterCharacter CounterText Case ConverterSlug GeneratorRemove Duplicate LinesLorem Ipsum GeneratorReplace TextTruncate Text

Developer Tools

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JSON FormatterJSON MinifyBase64 Encoder/DecoderURL Encoder/DecoderHash GeneratorCalculate MD5 HashCalculate SHA-256 HashCalculate SHA3 Hash

Date & Time Tools

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Timestamp ConverterUnix Time to UTCUTC Time to UnixSeconds to H:M:SH:M:S to SecondsRandom Date & Time Generator

Converters

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Color ConverterCron Expression ReaderCSV to JSONJSON to CSVYAML to JSONHex ↔ TextWei ↔ Gwei ↔ ETHHex ↔ Decimal

Generators

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UUID GeneratorPassword GeneratorRandom Number GeneratorRandom Name PickerQR Code GeneratorBarcode GeneratorFavicon Generator

Password Tools

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Create MariaDB PasswordCreate PostgreSQL PasswordCreate Bcrypt PasswordVerify Bcrypt PasswordCreate Scrypt PasswordVerify Scrypt PasswordCreate Random PasswordCreate Random UUID/GUID

Math Tools

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Number Base ConverterBinary CalculatorNumbers to WordsWords to NumbersScientific Notation Converter

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