Utility Tools

Essential everyday utilities. Password generator, QR codes, color converter, timers, and productivity tools.

102 free tools available

Free Secure Password Generator

Generate secure, random passwords with customizable options. Free, fast, and works entirely in your browser with no sign-up required.

Free UUID/GUID Generator

Generate universally unique identifiers (UUIDs/GUIDs). Free, fast, and works entirely in your browser with no sign-up required.

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Free QR Code Generator Online

Create QR codes for URLs, text, WiFi, and contacts. Customize colors, size, and error correction. Free, private — runs in your browser, no sign-up.

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Free JSON Formatter & Validator

Format, validate, and beautify JSON data with syntax highlighting and error detection. Free, fast, and works entirely in your browser with no sign-up required.

Free Base64 Encoder/Decoder

Encode any text to Base64 format or decode Base64 strings back to readable text. Free, fast, and works entirely in your browser with no sign-up required.

Free Color Converter Tool

Convert colors between HEX, RGB, HSL, and other formats with a live preview. Free, fast, and works entirely in your browser with no sign-up required.

Free Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa with timezone support. Free, fast, and works entirely in your browser with no sign-up required.

Free SHA Hash Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hash values. Free, fast, and works entirely in your browser with no sign-up required.

Free Cron Expression Generator

Generate and understand cron expressions with human-readable descriptions. Free, fast, and works entirely in your browser with no sign-up required.

Free JWT Decoder Online

Decode JSON Web Tokens (JWT) to view header and payload. Free, fast, and works entirely in your browser with no sign-up required.

Free Pomodoro Timer Online

Stay focused with the Pomodoro Technique - work sessions with breaks. Free, fast, and works entirely in your browser with no sign-up required.

Free Invoice Generator Online

Create professional invoices for your business with customizable templates and PDF export. Free, fast, and works entirely in your browser with no sign-up required.

Free Color Palette Generator

Generate beautiful color palettes with harmony algorithms. Free, fast, and works entirely in your browser with no sign-up required.

Free Visual Regex Builder

Build, test, and debug regular expressions visually with real-time match highlighting. Free, fast, and works entirely in your browser with no sign-up required.

Free QR Code Scanner Online

Scan QR codes from images and detect content types. Free, fast, and works entirely in your browser with no sign-up required.

IP Subnet Calculator (IPv4 & IPv6)

Calculate IPv4 and IPv6 subnets: network, broadcast, host range, masks, CIDR splits, and binary breakdown. Free, fast, and works entirely in your browser with no sign-up required.

CIDR Notation Converter

Bulk-convert between CIDR blocks, IP ranges, netmasks, and wildcard masks with range aggregation. Free, fast, and works entirely in your browser with no sign-up required.

Bibliography & Citation Generator

Generate citations in APA, MLA, Chicago, Harvard, IEEE, and Vancouver styles for books, journals, websites, and conference papers. BibTeX export.

CSV Viewer

View, sort, filter, and analyze CSV/TSV files online. Paste or upload data to explore in an interactive table with column statistics and type detection.

Periodic Table Explorer

Interactive periodic table with all 118 elements. Search, filter by category, view properties, and explore states of matter at different temperatures.

Random Number Generator

Generate cryptographically secure random integers, decimals, Gaussian values, dice rolls, and lottery picks — all in your browser.

Free Reference & Citation Formatter

Format citations in APA, MLA, Chicago, Harvard, IEEE and more from source details. Free, fast, and works entirely in your browser with no sign-up required.

Free Physics Formula Lookup & Calculator

Search 80+ physics formulas by topic with variable definitions and solve-for-any-variable calculator. Free, fast, and works entirely in your browser with no sign-up required.

Free Essay Outline Generator

Generate structured essay outlines with section breakdowns for any essay type. Free, fast, and works entirely in your browser with no sign-up required.

Free Multiple Choice Question Generator

Generate MCQ quiz questions from any text using keyword and fact extraction. Free, fast, and works entirely in your browser with no sign-up required.

CSV Splitter

Split large CSV files into smaller chunks by row count, number of files, or column value. Download individually or as a ZIP archive.

Spaced Repetition Scheduler

Optimize learning with SM-2 spaced repetition. Create flashcards, review at optimal intervals, track mastery with a 30-day calendar view.

JSON Query Tool (jq-like)

Query and transform JSON data using jq-like syntax. Extract, filter, and reshape with pipes, selects, maps, sort_by, unique, flatten, and more.

Data Anonymizer

Anonymize sensitive PII in CSV or JSON data. Auto-detects names, emails, phones, SSNs, credit cards, and IPs. Deterministic mode available.

CSV Deduplicator

Remove duplicate rows from CSV files. Deduplicate by exact match or selected columns with case-insensitive and whitespace trimming options.

Free Online CSV Editor

Edit CSV files in your browser with a table interface. Add, delete, sort, and filter rows. Free, fast, and works entirely in your browser with no sign-up required.

Free CSV Merger Tool

Merge multiple CSV files by stacking rows or joining on a common key column. Free, fast, and works entirely in your browser with no sign-up required.

Free CSV Filter & Query Tool

Filter CSV rows by column conditions with AND/OR logic. Download filtered results. Free, fast, and works entirely in your browser with no sign-up required.

Free CSV Sorter Tool

Sort CSV files by one or more columns in ascending or descending order. Free, fast, and works entirely in your browser with no sign-up required.

Free CSV Column Remover

Remove or reorder columns from CSV files. Rename columns and preview before download. Free, fast, and works entirely in your browser with no sign-up required.

Free JSONL / NDJSON Viewer

View and explore JSONL (newline-delimited JSON) files as a table or formatted JSON list. Free, fast, and works entirely in your browser with no sign-up required.

Free CSV Pivot Table Generator

Create pivot tables from CSV data with sum, count, average, min, and max aggregations. Free, fast, and works entirely in your browser with no sign-up required.

Free Fake JSON Data Generator

Generate fake JSON test data with custom schemas. Supports strings, numbers, dates, emails, and more. Free, fast, and works entirely in your browser with no sign-up required.

Free Fake User Profile Generator

Generate realistic fake user profiles with names, emails, addresses, and more for testing. Free, fast, and works entirely in your browser with no sign-up required.

Free Audio Speed Changer

Change audio playback speed with pitch correction. Supports MP3, WAV, OGG files. Free, fast, and works entirely in your browser with no sign-up required.

Free Audio Reverser

Reverse any audio file online. Play and download the reversed audio as WAV. Free, fast, and works entirely in your browser with no sign-up required.

Free Online Voice Recorder

Record audio from your microphone in the browser. Play back and download recordings. Free, fast, and works entirely in your browser with no sign-up required.

Free Browser Screen Recorder

Record your screen, window, or tab directly in the browser. Download as WebM video. Free, fast, and works entirely in your browser with no sign-up required.

Free Video Rotate & Flip Tool

Rotate or flip video files 90°, 180°, 270° or flip horizontally/vertically online. Free, fast, and works entirely in your browser with no sign-up required.

Free Video Thumbnail Extractor

Extract frames and thumbnails from video files. Download as PNG or JPG images. Free, fast, and works entirely in your browser with no sign-up required.

Free Video to GIF Converter

Convert video clips to animated GIF. Control frame rate, size, and duration online. Free, fast, and works entirely in your browser with no sign-up required.

Free Audio Trimmer

Trim audio files to any start and end point. Preview and download as WAV. Free, fast, and works entirely in your browser with no sign-up required.

Free MAC Address Generator

Generate random valid MAC addresses in multiple formats. Supports custom OUI vendor prefixes. Free, fast, and works entirely in your browser with no sign-up required.

Free MAC Address Vendor Lookup

Look up the vendor/manufacturer from a MAC address OUI prefix instantly. Free, fast, and works entirely in your browser with no sign-up required.

Free File Checksum Verifier

Calculate MD5, SHA-1, SHA-256, SHA-512 checksums and verify file integrity. Free, fast, and works entirely in your browser with no sign-up required.

Free TOTP / Authenticator Code Generator

Generate TOTP 2FA codes from a secret key. Compatible with Google Authenticator. Free, fast, and works entirely in your browser with no sign-up required.

Free Flashcard Generator & Study Tool

Create, study, and review flashcards from your notes. Interactive flip cards with spaced repetition-style review. Free, fast, and works entirely in your browser with no sign-up required.

Free Quiz Maker from Notes

Convert your study notes into a multiple choice quiz. Auto-generate questions and answers from any text. Free, fast, and works entirely in your browser with no sign-up required.

Free Chemistry Equation Balancer

Balance chemical equations automatically. Get step-by-step solutions with element count verification. Free, fast, and works entirely in your browser with no sign-up required.

Free Language Learning Flashcards

Learn vocabulary in Spanish, French, German, Japanese, and more with interactive language flashcards. Free, fast, and works entirely in your browser with no sign-up required.

Free 3-Way Diff Viewer

Compare two or three versions of text side by side. Visualize additions, deletions, and conflicts with color highlighting.

Free CSV to Chart Generator

Convert CSV data to beautiful charts online. Create bar, line, pie, scatter, and area charts from your data. Free, fast, and works entirely in your browser with no sign-up required.

Free SQLite Online Viewer

View SQLite database files in your browser. Browse tables, run SQL queries, and export results without any software. Free, fast, and works entirely in your browser with no sign-up required.

Free Parquet File Viewer

Inspect Apache Parquet file metadata in your browser. View schema, row counts, column statistics, and file structure. Free, fast, and works entirely in your browser with no sign-up required.

Free Crypto Portfolio Tracker

Track your cryptocurrency holdings with live prices from CoinGecko. Monitor P&L, total value, and export your portfolio as CSV.

Free ENS Name Lookup Tool

Resolve ENS (.eth) names to Ethereum addresses and perform reverse lookups. View avatars and open records in the ENS app or Etherscan.

Free RSA Key Pair Generator

Generate RSA public/private key pairs (1024, 2048, or 4096-bit) in your browser using the Web Crypto API. Nothing is transmitted to any server.

Free TLS Cipher Suite Reference

Browse 25+ TLS cipher suites with security ratings (Recommended/Secure/Weak/Insecure), PFS support, and TLS version filters. Check your site with SSL Labs.

Free Live Crypto Price Tracker

Track real-time cryptocurrency prices for 15+ coins using CoinGecko API. View 24h change, market cap, and volume. Auto-refreshes every 60 seconds.

Free Ethereum Gas Fee Estimator

Check current Ethereum network gas prices using public RPC. Estimates fees for common operations (ETH transfer, ERC-20 swap, NFT mint) in USD.

Free Ethereum Address Validator

Validate Ethereum addresses, convert to EIP-55 checksum format, and view raw bytes. Link directly to Etherscan for any valid address.

Free Crypto Wallet Balance Checker

Check Ethereum wallet balances on Ethereum, BSC, Polygon, Arbitrum, and Optimism using public RPC endpoints. View balance in ETH and USD.

Free Multi-Chain Block Explorer

Open any transaction hash, block number, wallet address, or contract in 15+ blockchain explorers at once. Supports Ethereum, BSC, Polygon, Solana, Bitcoin, and more.

Free Ethereum ABI Decoder

Decode Ethereum smart contract call data using an ABI JSON. Parse function selectors, decode uint256, address, bool, string, and bytes32 parameters.

Free NFT Metadata Viewer

View NFT metadata by contract address and token ID. Fetches token URI via JSON-RPC, resolves IPFS links, and displays image, traits, and collection info.

Free Bitcoin Units Converter

Convert between BTC, mBTC, μBTC, Bits, and Satoshis in real-time. Includes USD equivalent via live price and transaction fee calculator in sat/vbyte.

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Free Cron Expression Parser & Generator

Parse any cron expression to plain English and see the next 5 run times. Or build a cron expression visually with dropdowns, presets, and field reference. Supports */n, ranges, lists.

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Free Bitcoin Address Generator (Educational)

Educational Bitcoin key generator. Generates a random private key, WIF encoding, and a simulated P2PKH Bitcoin address. Learn how Bitcoin addresses are derived with step-by-step explanation.

Argon2 Password Hash Format Explorer

Understand the Argon2 PHC string format, parameter meanings (time cost, memory cost, parallelism), and how Argon2 compares to bcrypt, scrypt, and PBKDF2. Educational tool with simulated hash output.

Free SSH Key Pair Generator

Generate RSA SSH key pairs (2048 or 4096-bit) in your browser using the Web Crypto API. Produces a private key (PEM format), public key (OpenSSH authorized_keys format), and SHA-256 fingerprint.

Barcode Generator

Generate barcodes in various formats including Code128, EAN, UPC. Free, fast, and works entirely in your browser with no sign-up required.

Border Radius Generator

Generate CSS border-radius values with visual preview. Free, fast, and works entirely in your browser with no sign-up required.

Box Shadow Generator

Create CSS box shadows with visual controls and code output. Free, fast, and works entirely in your browser with no sign-up required.

Color Blindness Simulator

Simulate different types of color blindness on images and colors. Free, fast, and works entirely in your browser with no sign-up required.

Countdown Creator

Create countdowns to important dates and events. Free, fast, and works entirely in your browser with no sign-up required.

Crypto Converter

Convert between cryptocurrencies and fiat currencies. Free, fast, and works entirely in your browser with no sign-up required.

CSS Unit Converter

Convert between CSS units like px, rem, em, vh, vw. Free, fast, and works entirely in your browser with no sign-up required.

CSV JSON Converter

Convert between CSV and JSON data formats. Free, fast, and works entirely in your browser with no sign-up required.

Data URL Converter

Convert files and text to data URLs and back. Free, fast, and works entirely in your browser with no sign-up required.

Gradient Generator

Create CSS gradients with visual controls and code output. Free, fast, and works entirely in your browser with no sign-up required.

HTTP Status Codes

Reference guide for HTTP status codes with descriptions. Free, fast, and works entirely in your browser with no sign-up required.

Image to Base64

Convert images to Base64 encoded strings and data URLs. Free, fast, and works entirely in your browser with no sign-up required.

IP Info Lookup

Look up IP address information including location and ISP details. Free, fast, and works entirely in your browser with no sign-up required.

JSON YAML Converter

Convert between JSON and YAML data formats. Free, fast, and works entirely in your browser with no sign-up required.

JWT Generator

Generate and decode JSON Web Tokens for authentication. Free, fast, and works entirely in your browser with no sign-up required.

Lorem Picsum

Generate placeholder images with customizable dimensions. Free, fast, and works entirely in your browser with no sign-up required.

Markdown Preview

Preview and edit Markdown with live rendering. Free, fast, and works entirely in your browser with no sign-up required.

Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal. Free, fast, and works entirely in your browser with no sign-up required.

Password Strength Checker

Check password strength and get improvement suggestions. Free, fast, and works entirely in your browser with no sign-up required.

Placeholder Image Generator

Generate placeholder images with custom size, color, and text. Free, fast, and works entirely in your browser with no sign-up required.

Random String Generator

Generate random strings with customizable length and characters. Free, fast, and works entirely in your browser with no sign-up required.

Regex Tester

Test and debug regular expressions with real-time matching. Free, fast, and works entirely in your browser with no sign-up required.

Online Stopwatch

Online stopwatch with lap times and split tracking. Free, fast, and works entirely in your browser with no sign-up required.

String Escape Tool

Escape and unescape strings for various programming languages. Free, fast, and works entirely in your browser with no sign-up required.

Timezone Converter

Convert times between different time zones worldwide. Free, fast, and works entirely in your browser with no sign-up required.

URL Encoder Decoder

Encode and decode URLs and URL components. Free, fast, and works entirely in your browser with no sign-up required.

User Agent Parser

Parse user agent strings to identify browser, OS, and device. Free, fast, and works entirely in your browser with no sign-up required.

Guides & tutorials

Step-by-step guides to get the most out of these tools.

How to Create a QR Code for Free How to Generate a Strong Password How to Decode a JWT (JSON Web Token)

About Utility Tools

Our Utility Tools are the everyday essentials you reach for again and again. Generate strong passwords and QR codes, pick and convert colors, format and validate JSON, encode Base64 and URLs, run timers and stopwatches, create random data, and dozens more — a genuinely useful grab-bag that loads instantly.

They help developers, students, and professionals across every workflow. Everything runs locally with no signup. Explore our Developer Tools for build-focused utilities, our Security Tools for encryption and hashing, and our Calculator Tools for quick math.

Related categories

Developer Tools Security Tools Calculator Tools