Fast Client-Side Utilities
Free, fast, and completely secure web tools. We protect your data by processing everything directly in your browser.
555 Timer Calculator
Calculate astable frequency, duty cycle, charge and discharge time, or monostable pulse width for a 555 timer.
Audio Analyzer
Audio Analyzer helps you work precisely with levels, loudness, and stereo analysis in the browser.
MP3 to WAV / WAV to MP3
Local audio conversion between MP3 and WAV directly in the browser without downloading to the server.
Audio Key Detector
Estimate the musical key of an uploaded audio file with local browser analysis.
Merge Audio
Combine multiple audio files into one track right in the browser quickly and confidentially.
Audio Normalizer
Equalize the volume level of audio files to the optimal standard without losing quality.
Audio Scale Converter
Audio Scale Converter helps you work precisely with levels, loudness, and stereo analysis in the browser.
Audio File Spectrogram
Audio File Spectrogram shows the frequency content of sound directly in the browser without uploading it to a server.
Audio Speed and Pitch
Flexibly change playback speed and audio pitch locally in the browser.
Trim Audio
Cut desired fragments from audio files instantly and safely right in the browser.
Base64 / Hex / Binary Multi-Coder
Convert text or binary files to Base64, Hexadecimal, Binary representation and back.
Calculator
A convenient web calculator for quick mathematical calculations in a stylish design.
Tap BPM Counter
Determine the tempo of music (BPM) in real time with simple keystrokes.
Case Converter
Instant text case conversion: uppercase, lowercase, transliteration and URL slug generation.
Chord Key Finder
Find likely major or minor keys from a typed chord progression with scale-degree labels.
Photo in Circle
Create beautiful round avatars with frames and gradient backgrounds completely offline.
Code Formatter
Fast alignment and formatting of HTML, CSS, JavaScript and TypeScript code offline.
Collage Maker
Place images on standard paper sizes (A4, A3, Letter) for printing.
Color Palette Generator
Create harmonious color palettes from a base color and export CSS codes.
Color Code Translator & Contrast Matrix
Convert color models between HEX, RGB, HSL, CMYK, and LCH, check WCAG contrast compliance, and blend colors in LCH space.
Countdown Timer
Simple and stylish countdown timer with completion sound.
Cron Validator
Offline syntax checking of Cron expressions with human-language interpretation of the schedule.
CSV Validator
Quickly check CSV files for integrity, delimiters and column matching offline.
JSON / YAML / TOML / XML Serialization Converter
Bidirectional conversion between JSON, XML, YAML, and CSV config serialization formats fully client-side.
Dice Roller
Roll multiple 3D dice, set each die color, and reroll only selected dice.
Dockerfile Validator
Syntax validation and best practices for writing Dockerfiles locally in the browser.
Elden Ring Runes Calculator
Calculate the total Runes needed to reach your target level in Elden Ring, and estimate runs on popular farming spots.
AES-GCM Secure Encrypted Notepad
Author, encrypt, and decrypt custom text files locally using secure AES-GCM 256-bit password-based encryption.
ENV Validator
Analyze .env files for syntax correctness, open quotes and duplicate keys offline.
Genshin Impact XP Calculator
Calculate the Adventure Rank (AR) experience points, days, and daily commissions required to reach your target rank in Genshin Impact.
Cryptographic Checksum Hash Generator
Generate and compare multiple cryptographic hash checksums (MD5, SHA-1, SHA-256, SHA-512) for text and large files locally.
HTML & URL Encoder / Decoder
Escape HTML entities and encode URL percent strings safely.
HTML Validator
Analyze HTML code for open tags, nesting correctness and markup validity offline.
Image Compressor
Reduce the size of images (PNG, JPEG, WebP) locally in the browser without losing quality.
Image Converter
Quickly convert images between PNG, JPEG, WebP, GIF, BMP offline in the browser.
Image Cropper
Crop images with a handy selection box locally in the browser.
Image Resizer
Change the width and height of images in pixels or percentages locally and securely.
Steganography Hidden Image Encoder
Hide confidential text messages inside image pixels using LSB encoding or recover data from encoded PNG files offline.
INI Validator
Validation of INI configuration files for correct sections, keys and values offline.
Guitar and Ukulele Tuner
Tune guitar, ukulele, bass, violin, and mandolin with live microphone pitch detection.
JSON Formatter
Beautifully format, validate, compress and sort JSON data locally.
JSON Schema Validator
Validation of JSON documents against a given JSON Schema locally.
JSON Validator
Check JSON structure and configurations for errors offline in the browser.
JWT Token Debugger
Decode, inspect and verify the signatures of JSON Web Tokens fully client-side.
Key Chord Builder
Build the diatonic chords of a selected key and label every degree with its harmonic role.
LC Resonance Calculator
Calculate LC resonant frequency, reactance, optional Q factor, and bandwidth from inductor and capacitor values.
LED Resistor Calculator
Choose a series resistor for one or more LEDs and estimate resistor power dissipation.
Magic Bytes & Binary Header Doctor
Inspect file magic signatures, view raw hex/ASCII headers, and repair corrupted binary file headers client-side.
Markdown Converter
Instant two-way conversion between Markdown markup and plain HTML.
Metronome
Professional online metronome with selection of tempo and sound accents for rehearsals.
Minecraft XP Calculator
Calculate the exact experience points, levels, and farm activities needed to reach your target level in Minecraft.
Random Fake Data & Mock API Generator
Produce realistic mock datasets including names, emails, addresses, companies, and credit cards fully offline.
Morse Code & Cipher Playbook
Translate to Morse code with audio player and decode classic Caesar, Rot13 and Vigenere ciphers.
Mouse Sensitivity Converter
Convert mouse sensitivity settings between popular games, calculate eDPI, and find physical cm/360 rotation distance.
Notepad Calculator
Write notes along with mathematical expressions - the tool will calculate everything line by line.
Numbers to Words
Converting numbers and monetary amounts into text with correct cases and currencies.
Office Table Converter
Convert data between CSV, TSV, HTML, Markdown and JSON without uploading to the server.
Ohm's Law Calculator
Find voltage, current, resistance, and power from any two known electrical values.
Op-Amp Gain Calculator
Calculate inverting and non-inverting op-amp gain, dB gain, and expected output voltage.
Password Hasher & Key Derivator
Hash passwords and derive cryptographic keys client-side using PBKDF2 and Scrypt KDF algorithms.
PCB Trace Width Calculator
Estimate PCB trace width from current, temperature rise, copper thickness, layer location, and trace length.
PDF Compressor
Reduce the size of PDF files by optimizing images and fonts locally.
Preferred RC Filter Designer
Find practical E12, E24, or E96 resistor and capacitor pairs for a target RC filter cutoff.
QR Code Generator
Create custom QR codes from links, texts and Wi-Fi networks locally in the browser.
QR Code Scanner
Scan QR codes from files or your webcam instantly and privately in your browser.
RC High-Pass Calculator
Calculate RC high-pass cutoff, impedance, gain, phase, and response at a test frequency.
RC Low-Pass Calculator
Calculate RC low-pass cutoff, impedance, gain, phase, and response at a test frequency.
Realtime Spectrum Analyzer
Realtime Spectrum Analyzer shows the frequency content of sound directly in the browser without uploading it to a server.
Replace in Text
Convenient replacement of text or regular expressions (Regex) with case saving locally in the browser.
RLC Q Calculator
Calculate resonance, Q factor, and bandwidth for series or parallel RLC circuits.
Find in Text
Quickly search text using keywords or regular expressions (Regex) right in your browser.
Developer Secrets & Token Generator
Bulk generate cryptographically secure API keys, salts, tokens, and decode precise millisecond timestamps from UUIDv7.
Remove Silence from Audio
Automatically find and cut silence and long pauses from your audio recordings.
Stopwatch
Time yourself to the millisecond by recording laps, locally in your browser.
Text to Speech
Speak your written text using natural browser voices and save the audio.
TOML Validator
Check the syntax and structure of TOML configuration files locally and securely.
Tone Generator
Generate a clean audio tone of a given frequency and waveform locally in the browser.
TSV Validator
Validate TSV (Tab Separated Value) files for integrity and structure offline.
URL Parser & Query Inspector
Deconstruct complex URLs, manage deep queries, and decode URL parameters cleanly fully client-side.
Voice Recorder
Record sound from the microphone directly in the browser with instant download.
Voltage Divider Calculator
Calculate ideal and loaded voltage divider output, current, resistor power, and effective resistance.
WASM Disassembler & Demangler
Decompile WebAssembly binary modules into readable WAT S-expressions and demangle compiler function symbols client-side.
Audio Waveform Visualizer
Visualize the structure of an audio file as a detailed sound wave locally.
Wheatstone Bridge Calculator
Calculate Wheatstone bridge differential output, balance point, and excitation-relative error.
Wheel Spinner
Spin a weighted decision wheel locally in your browser.
Words to Numbers
Conversion of capital letter numerals back into numerical figures and monetary amounts.
XML Validator
Validate XML code and configuration files for syntax and closed tags offline.
YAML Validator
Check YAML configurations (Kubernetes, CI/CD) for correct indentation offline.
Why Choose Invistools?
Invistools is a comprehensive collection of fast, free, and secure web tools designed for your daily micro-tasks. Whether you need to edit text, optimize images, convert PDFs, or process audio files, everything is available in one convenient place.
Security & Anonymity: All operations are executed entirely client-side. This means your files, documents, and texts never leave your browser, are never uploaded to any external servers, and remain 100% private and secure.
Save Time & Keep It Simple: No installations, no registrations, and no limits. Just open the utility you need and get instant results. Save your time and safeguard your privacy with our offline-capable tools.