PivaBox - Free Online Browser Tools

265+ free online tools. All processing runs locally in your browser. Privacy-first, no upload required.

All Tools

• AI Config Hub — Configuration guides for Claude Code, OpenRouter, MCP, etc.
• API Builder — Build API request payloads for Claude/GPT
• ASCII Art Generator — Convert images to ASCII art with customizable character sets, color modes, and live preview. All processing happens locally in your browser.
• ASCII Table Builder — Convert CSV or JSON data into a formatted ASCII table
• Audio Effects — Voice changer and audio effects — pitch shift, reverb, echo, distortion, EQ, robot voice. Process in your browser with Web Audio API
• Audio Recorder — Record audio directly in your browser — visualize waveform and download as WebM
• Audio Trimmer — Trim audio files, add fade effects, and export — all in your browser
• Audio Visualizer — Real-time music visualization with multiple styles — bars, waveform, particles, and fireworks
• Barcode Generator — Generate barcodes in multiple formats (Code 128, EAN-13, EAN-8, UPC-A, Code 39, ITF) using pure Canvas rendering
• Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal
• Base32 Encoder/Decoder — Encode and decode text with Base32 — RFC 4648, Base32Hex, and Crockford variants
• Base58 Encoder/Decoder — Encode and decode text with Base58 — the Bitcoin-friendly encoding without ambiguous characters
• Base64 Encoder / Decoder — Encode text to Base64 or decode Base64 back to text
• BaseN Encoder — Custom base encoding with any alphabet — Base36, Base62, Base64url, or define your own
• Batch Image Resizer — Resize multiple images at once — set dimensions, format, and quality for all
• Bcrypt Generator — Hash passwords with bcrypt — industry-standard adaptive hashing with configurable cost factor
• JS Benchmark Runner — Compare JavaScript code performance — measure execution speed of different implementations side by side
• Blood Pressure Tracker — Log and track your blood pressure readings, view trends and statistics with color-coded classifications
• BMI Calculator — Calculate Body Mass Index and determine weight category with height and weight inputs
• Body Fat Calculator — Estimate body fat percentage using the U.S. Navy circumference method
• BPM Detector — Detect BPM (beats per minute) from audio — onset detection algorithm with tap tempo mode. All processing in your browser
• Bracket Matcher — Check brace, bracket, and parenthesis matching in code
• Browser Fingerprint Viewer — See what your browser reveals — canvas, WebGL, fonts, hardware, and 25+ fingerprint vectors tracked by websites
• Case Converter — Convert text between uppercase, lowercase, title case, and more
• SSL Certificate Viewer — Check SSL/TLS certificate status for any domain — HTTPS verification, security headers, HSTS, CT logs, and openssl command generation
• ChaCha20 Encrypt/Decrypt — Encrypt and decrypt data using ChaCha20-Poly1305 — the modern AEAD cipher used in TLS 1.3 and WireGuard
• Chart Builder — Create beautiful bar, line, pie, and doughnut charts — customize data, colors, and export as PNG
• File Integrity Checker — Calculate and verify file checksums — MD5, SHA-1, SHA-256, SHA-384, SHA-512, CRC32
• Chinese to Pinyin — Convert Chinese characters to Pinyin with tone marks — supports common characters
• Vertical Text Converter — Display text in traditional vertical layout — right-to-left with punctuation rotation
• Chmod Calculator — Calculate Unix file permissions with visual checkbox selection and numeric output
• CIDR Aggregator — Merge multiple CIDR ranges into minimal supernets — optimize firewall rules and routing tables
• Color Blindness Simulator — Simulate how images appear to people with different types of color vision deficiency
• Color Converter — Convert colors between HEX, RGB, HSL formats
• Color Palette Generator — Generate harmonious color palettes with complementary, analogous, triadic, and monochromatic schemes
• Color Picker — Pick colors from images and get HEX, RGB, HSL values
• Commit Message Generator — Generate Conventional Commit messages from git diff — auto-detect type, scope, and breaking changes
• Compound Interest Calculator — Calculate compound interest growth over time — see how your investments grow with regular contributions and different compounding frequencies
• Context Window Simulator — Simulate and visualize LLM context window usage — track tokens, conversation turns, and stay within limits
• Countdown Timer — Count down to important events with live updating days, hours, minutes, and seconds
• Cron Parser — Parse and explain cron expressions in human-readable format
• Crontab Builder — Build cron expressions visually with dropdown selects and human-readable explanations
• CSS Animation Builder — Visually build and preview CSS animations with presets, duration, delay, and easing controls
• CSS Generator — Generate CSS code for box shadows, gradients, and more
• CSS Minifier — Minify CSS by removing whitespace, comments, and redundant rules to reduce file size
• CSS Specificity Calculator — Calculate CSS selector specificity — visual (a, b, c) breakdown with compare mode and selector explanation
• CSV to Markdown — Convert CSV data into a Markdown table with preview
• cURL Command Builder — Visually build curl commands — choose method, headers, auth, body, and get the ready-to-run curl command
• Mock Data Generator — Generate realistic fake data for testing — names, emails, phones, addresses, UUIDs, and more
• Data Anonymizer — Detect and redact sensitive information — emails, phones, credit cards, SSNs, IPs, and more
• Data Size Converter — Convert between data size units (B, KB, MB, GB, TB) with instant conversion
• Dataset Cleaner — Clean and normalize JSON/JSONL datasets for AI training — remove duplicates, normalize whitespace, strip HTML tags, standardize dates, and more
• Date Calculator — Calculate dates by adding or subtracting days, weeks, months, or years
• Dead Link Checker — Check multiple URLs for broken links — detect 404s, server errors, and redirects in bulk
• Duplicate Line Remover — Find and remove duplicate lines from your text with fuzzy matching support
• Diff Checker — Compare two texts side by side with added and removed lines highlighted
• Name — Query DNS records using DNS-over-HTTPS — check A, AAAA, CNAME, MX, TXT, NS, SOA records
• Dockerfile Generator — Generate optimized Dockerfiles for Node.js, Python, Go, Rust, Nginx, and more with best practices built-in
• Dominant Color — Extract the top 5 dominant colors from an image with HEX and RGB values
• Dot Grid Paper — Generate printable dot grid and graph paper with customizable dot size and spacing
• Email Spam Score Analyzer — Analyze your email for spam triggers — get a spam score and actionable improvement suggestions
• Text Similarity Comparator — Compare two texts using Jaccard, Cosine TF, and Levenshtein methods — visualize word overlap, frequency, and similarity scores
• Emoji Search — Search and find emojis by name or keyword with one-click copy
• Emoji to PNG — Render emoji to high-resolution PNG images with custom size and background
• Encoding Detector — Detect character encoding of text/files — BOM detection, UTF-8 validation, byte analysis, convert to UTF-8/ASCII/Base64/Hex, and mojibake fixer
• Encrypt / Decrypt — Encrypt and decrypt text using AES-256-GCM with password-based key derivation
• Password Entropy Meter — Calculate password entropy and estimate crack time — understand what makes a password strong
• .env File Generator — Generate .env files for Node.js, React, Next.js, Django, Rails, Laravel, Spring Boot, Go, and more with framework-specific variables
• Equation Solver — Solve linear, quadratic, and systems of equations with step-by-step solutions and interactive parabola graphing
• Excel to JSON — Convert Excel and CSV files to JSON — upload and get structured data
• EXIF Viewer — View photo metadata including camera settings, GPS location, and date information
• Email & URL Extractor — Extract emails, URLs, phone numbers, IP addresses and more from any text
• Favicon Generator — Generate favicons from emoji, text, or images — get all standard sizes from 16x16 to 256x256
• Flowchart Maker — Create professional flowcharts with shapes, connectors, and drag-and-drop editing. All processing happens locally in your browser.
• Font Preview — Preview and compare local system fonts with customizable sample text
• Fraction Calculator — Calculate with fractions — add, subtract, multiply, divide, simplify, and convert decimals to fractions
• Fuel Consumption Calculator — Calculate fuel consumption in L/100km, km/L, MPG and estimate trip/yearly fuel costs
• Full/Half Width Converter — Convert between full-width and half-width characters for punctuation, letters, and numbers
• Function Calling Designer — Visually design function calling / tool use schemas — export to OpenAI, Anthropic, or Generic JSON Schema format
• GIF Maker — Create animated GIFs from multiple images — adjust timing, order, and size
• GIF Frame Splitter — Extract individual frames from animated GIFs — download each frame as PNG
• Gitignore Generator — Generate .gitignore files by selecting technologies and patterns — live preview, copy, and download
• Gradient Generator — Create beautiful CSS gradients visually with linear and radial options
• 2D Graph Plotter — Plot mathematical functions on a 2D canvas — multiple functions, zoom, pan, and download as PNG
• GraphQL Formatter — Format, validate, and minify GraphQL queries with syntax highlighting, query depth analysis, and field counting
• Handwriting Generator — Create handwritten-style text images with various fonts and paper backgrounds
• Hash Checker — Compute SHA-256 hashes and compare against expected values for file verification
• Hash Generator — Compute SHA-1, SHA-256, SHA-384, SHA-512 hashes using browser Crypto API
• Security Headers Analyzer — Analyze HTTP security headers for any URL — check CSP, HSTS, X-Frame-Options and more
• HKDF Key Derivation — Derive cryptographic keys using HKDF (RFC 5869) — extract-then-expand with configurable salt and info
• HMAC Generator — Generate HMAC signatures using SHA-1, SHA-256, SHA-384, SHA-512 with a secret key
• HTML Encoder — Encode or decode HTML entities for safe web use
• HTML Formatter — Format and beautify HTML code with proper indentation and structure
• HTML Live Preview — Write HTML, CSS, and JavaScript and see the result in real-time — live sandbox in your browser
• HTML to Markdown — Convert HTML content to clean Markdown format automatically
• HTTP Status Codes — Quick reference for HTTP status codes with descriptions grouped by category
• Icon Generator — Generate simple icons from text and emoji
• Image Blur — Apply Gaussian blur to images with an adjustable radius slider
• Image Border — Add borders to images with configurable width, color, and line style
• Image Compressor — Compress images online with quality control and resize options, privacy safe
• Image Converter — Convert images between PNG, JPEG, WebP, and AVIF formats directly in your browser
• Image Crop — Crop images with an interactive selection tool
• Image Diff — Compare two images pixel by pixel and highlight the differences
• Image DPI Changer — Change image DPI metadata — adjust print resolution without affecting pixels
• Image Filter — Apply filters: grayscale, sepia, invert, blur, brightness, contrast
• Image Flip & Rotate — Flip images horizontally or vertically and rotate 90, 180, or 270 degrees
• Image Grayscale — Convert images to grayscale with adjustable RGB channel mixing weights
• Image Metadata Editor — View and edit EXIF metadata — change date, location, camera settings and more
• Oil Painting Effect — Transform photos into oil painting style — adjustable brush size and color intensity
• Image Pixelate — Create pixel art and mosaic effects — adjustable block size
• Image Placeholder — Generate placeholder images with custom dimensions, text, and background color
• Image Sharpen — Sharpen blurry images or reduce noise with adjustable strength
• Image to Sketch — Convert photos into pencil sketch drawings — edge detection with adjustable strength
• Image to Base64 — Convert uploaded images to Base64 data URIs for CSS, HTML, or raw format
• Image Watermark — Add text or image watermarks to your photos with position, opacity, and tiling controls
• Quick Translator — Translate words and common phrases between 20 languages using a built-in glossary — all processing happens in your browser
• IP Subnet Calculator — Calculate network address, broadcast, host range, and usable hosts from CIDR notation
• JS Minifier — Minify JavaScript by stripping comments and unnecessary whitespace
• JSON ↔ CSV — Convert between JSON and CSV formats
• JSON Diff — Compare two JSON objects and find differences — visual tree with color-coded changes
• JSON Formatter — Format, validate, and minify JSON data with syntax highlighting
• Random JSON Generator — Generate random JSON data from JSON Schema or template placeholders
• JSON Schema Generator — Generate JSON Schema from JSON data — auto-detects types, formats, and nested structures
• JSON to Excel — Convert JSON data to Excel (.xlsx) or CSV — download with one click
• JSON to Table — Convert a JSON array into an HTML table and copy as Markdown
• JSON to TypeScript — Generate TypeScript interface definitions from JSON objects automatically
• JSONL Converter — Convert JSON array or CSV to JSONL format
• JSONPath Tester — Test JSONPath expressions against JSON data with real-time result display
• JWT Decoder — Decode JWT tokens to view header, payload, and signature info
• Karaoke Maker — Remove vocals from songs using phase cancellation — create instrumental and vocal tracks. All processing in your browser
• Keyboard Event Viewer — Inspect keyboard events — key, code, keyCode, modifiers in real-time
• Keyword Extractor — Extract keywords from text with frequency scoring
• LaTeX Editor — Write LaTeX formulas with live KaTeX preview — symbol toolbar, presets, and export to PNG or SVG
• Life Calendar — Visualize your life in weeks with color-coded weekly blocks for each year
• Loan Calculator — Calculate mortgage and loan payments with equal installment or equal principal repayment — compare total costs and generate amortization schedules
• Lorem Ipsum — Generate placeholder text in various lengths
• Chinese Lorem Ipsum — Generate Chinese placeholder text using classical and modern Chinese phrases
• Markdown Preview — Write Markdown and see rendered HTML preview in real time
• Matrix Calculator — Perform matrix operations: addition, subtraction, multiplication, determinant, inverse, transpose, and scalar multiplication
• Maze Generator — Generate mazes using different algorithms (DFS, Kruskal, Prim) with customizable size and solution path
• MCP Config Builder — Visually build MCP server configurations for Claude Code — add servers, set commands, and export as JSON
• Meme Generator — Add text captions to images to create memes
• Mermaid Live Editor — Create diagrams from text — flowcharts, sequence diagrams, class diagrams and more using Mermaid syntax
• MessagePack Converter — Convert between JSON and MessagePack — a compact binary serialization format
• MIME Types Reference — Quick reference for common MIME types — search by extension or content type
• Mind Map — Create interactive mind maps with drag-and-drop nodes, auto-layout, and export options. All processing happens locally in your browser.
• Device Mockup Generator — Place screenshots into realistic device frames — iPhone, Android, iPad, MacBook, iMac, Apple Watch
• AI Model Comparator — Compare AI model outputs side by side — paste a prompt and responses to analyze differences
• Morse Code — Convert text to Morse code and decode Morse back to text
• Multi-Line Editor — Edit multiple lines at once — add prefix/suffix, number lines, sort, reverse, wrap, find & replace, and more
• Nano ID Generator — Generate compact unique IDs — faster and shorter than UUID, URL-safe
• NPM Package Analyzer — Description
• Number Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal bases
• Image to Text (OCR) — Extract text from images using browser-based OCR
• OpenAPI / Swagger Viewer — Description
• OTP Generator — Generate time-based one-time passwords (TOTP) with countdown timer for 2FA
• Password Generator — Generate strong random passwords with custom options
• Password Policy Tester — Test passwords against custom policies — length, character types, patterns, and common word checks
• Password Strength Checker — Analyze password strength with scoring, character analysis, and improvement tips
• Pattern Generator — Create seamless repeating patterns with customizable colors, scale, and rotation
• PBKDF2 Key Derivation — Derive cryptographic keys from passwords using PBKDF2 — configurable iterations, salt, and hash algorithm
• PDF Compressor — Compress PDF files — reduce file size by optimizing streams and removing unused objects
• PDF Image Extractor — Extract all embedded images from PDF files with preview and batch download
• PDF Form Filler — Fill in PDF forms directly in your browser — edit text fields, checkboxes, and dropdowns
• PDF Merger — Merge multiple PDF files into one document
• PDF Metadata — View PDF document metadata: title, author, pages, and more
• PDF Page Numberer — Add page numbers to PDF documents at customizable positions
• PDF Page Reorder — Reorder, remove, and rearrange PDF pages with drag and drop
• PDF Rotator — Rotate all pages of a PDF by 90, 180, or 270 degrees
• PDF Signer — Sign PDF documents with your handwritten signature — draw or type, then place on any page
• PDF Splitter — Split a PDF into separate pages or extract a page range
• PDF to Image — Convert PDF pages to PNG or JPEG images — set resolution and quality
• PDF to Text — Extract text content from PDF files
• PDF Unlocker — Remove password protection from PDF files
• PDF Watermark — Add text watermarks to PDF pages — customize position, opacity, rotation and tiling
• Percentage Calculator — Calculate percentages, proportions, and percentage changes with multiple modes
• Perpetual Calendar — Chinese perpetual calendar with lunar dates, zodiac signs, and heavenly stems & earthly branches
• PGP Key Generator — Generate PGP key pairs in your browser — RSA 2048/4096 or ECC P-256/P-384, export as PEM
• Photo Collage Maker — Combine multiple photos into a beautiful collage with customizable layout and spacing
• Pixel Art Editor — Draw pixel art with a color palette, pencil, eraser, flood fill, undo/redo, and export as PNG
• Pomodoro Timer — Stay focused with a customizable pomodoro timer — work in intervals with automatic break reminders and audio notifications
• Due Date Calculator — Estimate your pregnancy due date based on last menstrual period, conception date, or ultrasound date
• AI Pricing Calculator — Calculate API costs for popular AI models
• Prime Number Tools — Prime number toolkit — check primality, find factors, nearest primes, count primes in range
• Prompt Builder — Build multi-turn prompts with role assignment
• Prompt Diff — Compare two prompt versions side-by-side with word/character/line diff — track iterations and see what changed
• Prompt Library — 12 curated system prompt templates
• Prompt Optimizer — Optimize AI prompts with role, constraints, chain-of-thought, and more — compare before/after with character diff
• Prompt Template — Create reusable prompt templates with variables like [name] — fill, preview, save, and export
• Protocol Buffers Converter — Encode and decode Protocol Buffers messages with a .proto schema
• Punycode Converter — Convert between Unicode domain names and Punycode (RFC 3492) — essential for international domain names
• QR Code — Generate QR codes from text or URLs, and decode QR codes from images
• RAG Document Processor — Prepare documents for RAG pipelines — chunk text with configurable strategies, overlap, and metadata
• Random File Generator — Generate random test files in TXT, CSV, JSON, or binary format
• Random Generator — Generate random numbers and random strings with customizable character sets
• Reaction Time Test — Test your reaction speed — click when the box turns green
• Readability Analyzer — Analyze text readability with Flesch-Kincaid, Gunning Fog, SMOG and more
• README Generator — Description
• Regex Builder — Build regular expressions visually using checkboxes and selection controls
• Regex Escape / Unescape — Escape or unescape special regex characters in text
• Regex Explainer — Understand any regular expression — breaks down patterns into plain English explanations token by token
• Regex Golf — A puzzle game where you write the shortest regex to match target strings — beat the par score across 10 levels!
• Regex Tester — Test regular expressions in real-time with match highlighting
• Regex Visualizer — Visualize regular expressions as syntax diagrams — see the structure of your pattern
• Background Remover — Remove image background by clicking the color to make transparent
• Sankey Diagram — Create interactive Sankey (flow) diagrams to visualize energy, material, or data flows between nodes
• Schema Validator — Validate JSON against JSON Schema rules
• Scientific Calculator — Advanced scientific calculator with trig functions, logarithms, powers, and angle mode toggle — all in your browser
• Screen Recorder — Record your screen, window, or browser tab — preview, playback, and download as WebM
• Screenshot Beautifier — Make screenshots look beautiful — add shadows, rounded corners, backgrounds and browser frames in one click
• Scrypt Key Derivation — Derive keys using scrypt — a memory-hard KDF resistant to GPU and ASIC attacks
• Seal Generator — Create traditional Chinese seal stamps — customizable text, shape, and color
• Search and Replace — Search and replace text with optional regex support and match counting
• Semver Comparator — Compare semantic version numbers to determine which is newer, older, or equal
• Simplified/Traditional Chinese — Convert between Simplified and Traditional Chinese at character level
• Skeleton Loader Generator — Generate CSS skeleton loading placeholders with pulse and shimmer animations — Card, List, Text, Avatar, Table, Dashboard layouts
• Sleep Cycle Calculator — Calculate optimal sleep and wake times based on 90-minute sleep cycles to wake up refreshed
• Slug Generator — Convert text to URL-friendly slugs
• SM2 Encrypt/Decrypt — Encrypt and decrypt using SM2 — Chinese national standard for elliptic curve public-key cryptography
• SM4 Encrypt/Decrypt — Encrypt and decrypt data using SM4 — Chinese national standard block cipher (GB/T 32907)
• Social Media Resizer — Resize images to perfect dimensions for Instagram, Twitter, Facebook, LinkedIn, YouTube, TikTok and more
• Speech to Text — Convert speech to text using your microphone — supports 19 languages. All processing via browser Web Speech API
• Bill Splitter — Split a bill with friends — supports even split, percentage split, and item-by-item splitting with tip and tax
• SQL Formatter — Format and beautify SQL queries with keyword capitalization and indentation
• SSL Checker — Check SSL/TLS configuration for any domain — verify HTTPS, HTTP redirect, and HSTS headers
• Statistics Calculator — Calculate statistical measures including mean, median, mode, variance, and standard deviation
• String Escape — Escape and unescape strings for JSON, JavaScript, HTML, XML, URL, CSV and more
• String Inspector — Analyze strings: length, word count, character categories, Unicode code points, encoding
• Subtitle Editor — Create and edit SRT subtitle files — sync with video, export to SRT or WebVTT
• SVG to PNG — Convert SVG vector graphics to PNG images
• System Prompt Tester — Design test cases for system prompts — generate message variations, fill expected outputs, and export for API testing
• Table Visual Builder — Build and style tables visually with WYSIWYG editing, export to Markdown, HTML, CSV. All processing happens locally in your browser.
• Text Aligner — Align text to left, center, right, or justify with configurable width and padding
• Text Chunker — Split text into chunks for RAG preprocessing
• Text Cleaner — Normalize and clean text for AI preprocessing
• Text Diff — Compare two texts side by side and highlight differences
• Text Sorter — Sort, deduplicate, reverse, and shuffle text lines
• Text Summarizer — Auto-summarize text using TF-IDF extractive sentence scoring — keep the most important sentences
• Text to Speech — Convert text to natural-sounding speech using your browser's built-in voice engine
• Timeline Maker — Create beautiful horizontal or vertical timelines with custom events, color themes, and templates. All processing happens locally in your browser.
• Timestamp Converter — Convert Unix timestamps to readable dates and vice versa
• Time Zone Converter — Compare time zones, view live clocks for major cities, and find meeting overlap with a visual planner
• AI Token Counter — Count tokens, estimate costs for AI models
• Token Generator — Generate cryptographically secure random tokens in hex or base64 format
• TOML ↔ JSON — Convert between TOML configuration files and JSON format
• Pinyin / Romaji Converter — Convert Chinese characters to Pinyin, Japanese kana to Romaji, Cyrillic to Latin, and Arabic to Latin — all in your browser
• TSV ↔ CSV — Convert between TSV (tab-separated) and CSV (comma-separated) formats
• Typing Speed Test — Test your typing speed and accuracy with real-time WPM measurement
• User Agent Parser — Parse User-Agent strings to identify browser, engine, operating system, and device
• ULID Generator — Generate sortable unique identifiers — ULIDs are time-based and lexicographically ordered
• Unit Circle Explorer — Interactive unit circle — explore sine, cosine, tangent, common angles, and quadrant relationships with live visualization
• Unit Converter — Convert between units of length, weight, temperature, area, volume
• URL Encoder / Decoder — Encode or decode URL strings for safe web usage
• URL Parser — Parse URLs into individual components including protocol, host, path, and query parameters
• UUID Generator — Generate UUID v4 identifiers in bulk, copy to clipboard
• Vector Search Explainer — Interactive visualization of vector semantic search — see how words map to 2D space and find nearest neighbors by cosine similarity
• Venn Diagram — Create beautiful Venn diagrams with 2-3 circles, custom labels, colors, and downloadable PNG/SVG output. All processing happens locally in your browser.
• Video Metadata Viewer — Inspect video file metadata — resolution, codec, bitrate, and more — all in your browser
• Video to GIF — Convert video segments to animated WebM or extract individual frames — all in your browser
• WebSocket Tester — Test WebSocket connections — connect to any endpoint, send and receive messages in real-time
• Word Cloud Generator — Create beautiful word clouds from text with custom shapes, colors, fonts and layout options. All processing happens locally in your browser.
• Word Counter — Count characters, words, sentences, lines, and paragraphs
• XML Formatter — Format and beautify XML documents with proper indentation and structure
• XML ↔ JSON — Convert between XML and JSON formats bidirectionally
• YAML ↔ JSON — Convert between YAML and JSON formats in real-time