Directory
All Tools
Complete directory of 134 free browser-based utilities. Every tool runs locally — no uploads, no registration, no telemetry.
Hardware
4 toolsCalculators for power supply sizing, electrical cost estimations, and system balance analysis.
PSU Calculator
Estimate total system wattage and find the optimal Power Supply Unit (PSU) rating for stability.
PC Power Consumption Calculator
Calculate active electrical draw, daily/monthly kWh consumption, and electricity bill costs.
PC Hardware Balance Calculator
Evaluate architectural balance between CPU and GPU across resolutions and workloads with transparent, responsible performance guidelines.
PPI Calculator (Pixel Density)
Enter any resolution and diagonal screen size to get PPI, total pixels, aspect ratio, dot pitch, and the viewing distance beyond which individual pixels disappear.
Networking
5 toolsSubnet, CIDR, IP range, and IPv4/IPv6 notation tools for systems and network engineers.
IPv4 Subnet Calculator
Bitwise IPv4 subnetting calculations with full network, broadcast, wildcard, and binary breakdowns.
CIDR to Subnet Mask Calculator
Bidirectional converter between CIDR prefix notation (/24) and dotted-decimal subnet masks.
IP Range Calculator
Calculate span and total quantity of addresses between start and end IPv4 addresses.
IPv4 Address Converter
Transform IPv4 addresses into raw 32-bit decimal, binary octets, and hex notation.
IPv6 Validator & Notation Tool
Validate IPv6 syntax, expand collapsed colons, and inspect address scopes.
Converters
13 toolsExact digital storage and transmission rate conversions using decimal and binary standards.
Storage Capacity Calculator
Comprehensive multi-unit data storage converter covering 12 standard SI decimal and IEC binary units with simultaneous real-time conversion.
Mbps to MB/s Converter
Convert network bandwidth (Mbps) to operating system file download rates (MB/s).
MB/s to Mbps Converter
Convert file transfer metrics into required network bandwidth.
Length & Distance Converter
Convert between all common metric and imperial length units with exact, internationally agreed conversion factors — every unit shown at once.
Weight & Mass Converter
Convert between kilograms, grams, pounds, ounces, stone, and tons with exact definitions — all units displayed simultaneously.
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin in every direction with the formulas displayed, plus practical reference points.
Speed Converter
Convert between km/h, mph, m/s, knots, and ft/s simultaneously with exact, standards-based factors.
Area Converter
Convert between m², km², hectares, acres, ft², and square miles — with practical size comparisons for land and property.
Volume Converter
Convert liters, milliliters, cubic meters, US and imperial gallons, quarts, pints, cups, and fluid ounces — with the US/UK gallon distinction handled.
Energy & Power Converter
Convert joules, kWh, calories/kilocalories, BTU, and foot-pounds — connect electricity bills, food labels, and physics units.
Power Converter
Convert watts, kilowatts, mechanical and metric horsepower, and BTU/h — the units used across engines, PCs, and HVAC.
Pressure Converter
Convert between pascals, bar, PSI, atmospheres, mmHg, and mmH₂O — for tire pressures, weather reports, diving, and engineering.
Time Unit Converter
Convert between milliseconds, seconds, minutes, hours, days, weeks, and years — with exact multiples and decimal breakdowns.
Security
7 toolsCryptographic generators, hash digest creators, and encoders running strictly client-side.
Secure Password Generator
Generate cryptographically secure passwords locally via crypto.getRandomValues() with accurate real-time entropy scoring and zero server transmissions.
UUID Generator (v4 & v7)
Generate random UUID v4 and time-ordered UUID v7 identifiers locally using native browser crypto primitives with bulk and case options.
Cryptographic Hash Generator
Compute secure cryptographic message digests client-side using native window.crypto.subtle and pure JS MD5 with legacy safety indicators.
Base64 Encoder & Decoder
Encode or decode text to Base64 ASCII strings with full multi-byte Unicode UTF-8 handling.
URL Encoder & Decoder
Convert special characters to percent-encoded hex sequences (%20) and decode URI strings.
Random String Generator
Generate cryptographically secure random strings for tokens, IDs, and keys — with full control over length and character sets.
Text Entropy Analyzer
Measure the Shannon entropy of any text or password — bits per character, total bits, and a plain-language strength assessment.
Gaming
5 toolsPrecise mouse sensitivity, eDPI, display frame time, and field-of-view conversion tools.
eDPI Calculator
Calculate your effective sensitivity (eDPI) by combining mouse DPI with in-game sensitivity.
Mouse Sensitivity & cm/360 Converter
Convert your exact mouse sensitivity across game engines using verified angular yaw constants with cm/360 rotation metrics.
Field of View (FOV) Converter
Convert between Horizontal and Vertical Field of View across display aspect ratios.
FPS & Refresh Rate Calculator
Calculate exact frame presentation intervals in milliseconds for any framerate (FPS) or Hz.
Screen Resolution & Aspect Ratio Calculator
Analyze display resolutions, calculate lowest-term aspect ratios via GCD, and scale dimensions.
Video
2 toolsBitrate calculators, transmission speed estimations, and digital media container size predictors.
Video File Size & Bitrate Calculator
Comprehensive video calculator: estimate file sizes from bitrates, compute bitrates for upload file size targets, and calculate transfer times.
Download & Upload Time Calculator
Calculate download and upload times for any file size — covering game downloads, video uploads, and cloud backups — with real-world protocol overhead.
Image Tools
11 toolsCompress, resize, crop, convert, compare, and clean image files locally in your browser.
Image Compressor
Reduce image file size in your browser with adjustable quality, format, and a download-ready preview.
Image Resizer
Set exact image dimensions with a ratio lock and export a resized copy without uploading your image.
Image Cropper
Select a crop area with pointer or touch input, choose a ratio, and download the cropped image.
Image Pixelator
Paint over sensitive regions with adjustable pixelation. Pointer and touch input are supported and the source stays local.
Image Blur Tool
Apply a reversible blur brush to selected regions of a photo using mouse, touch, or stylus input.
Image Format Converter
Convert common raster images locally to JPG, PNG, or WebP and download the new format.
Image Metadata and EXIF Viewer
Review basic image metadata and dimensions before publishing or sharing a file.
EXIF Metadata Remover
Re-encode an image to remove common embedded metadata before sharing it online.
Image Compare
Load two images and inspect their differences with side-by-side, overlay, and slider views.
Favicon Generator
Turn any image or logo into standard multi-resolution PNG favicons, Apple Touch Icons, and web manifests with ready-to-paste HTML code.
Image Dimensions & Info Viewer
Instantly see any image’s exact pixel dimensions, aspect ratio, file size, and type — locally, with a live preview.
File Tools
7 toolsInspect, hash, rename, and convert common files without uploading them.
File Hash & Checksum Generator
Generate cryptographic checksums (SHA-256, SHA-384, SHA-512, SHA-1, MD5) and verify file integrity by comparing expected vendor hashes locally.
File Analyzer / File Information
Comprehensive browser-native file analyzer to inspect MIME types, dimensions, media streams, character counts, and cryptographic hashes without server uploads.
CSV to JSON Converter
Convert tabular data between CSV and JSON with quoted-field handling, validation, copy, and download.
XML Formatter & Validator
Pretty-print and minify XML documents with clear indentation and instant parsererror line/column syntax diagnostics.
JSON to YAML Converter
Move configuration data between JSON and a practical YAML subset without uploading content.
Batch File Rename Preview
Preview exactly how a batch of file names would look after your rename rules — a planning step; nothing is modified or downloaded automatically.
CSV Delimiter Converter
Re-delimit CSV/TSV data between comma, semicolon, tab, and pipe — with RFC-correct quoting so embedded separators never break fields.
Developer Tools
16 toolsFast local utilities for JSON, XML, regex, JWT, timestamps, colors, and code cleanup.
JSON Formatter & Validator
Professional developer utility to format, validate, and minify JSON with precise line/column syntax error detection and payload size statistics.
Regex Tester & Debugger
Experiment with regular expressions, inspect every matched occurrence and named capture group, and test replacements with zero server transmission.
JWT Decoder
Read a JSON Web Token header and payload locally. Decoding does not verify the signature.
HTML Formatter & Minifier
Beautify or minify HTML markup with before/after payload reduction metrics and client-side privacy.
CSS Formatter & Minifier
Format or minify CSS stylesheets in your browser with payload reduction statistics and zero server processing.
Unix Timestamp Converter
Translate epoch timestamps and ISO dates while showing UTC and local browser time.
Color Converter
Inspect and convert colors across all major web and print formats (HEX, RGB, RGBA, HSL, HSLA, HSV, CMYK) in real time with interactive preview.
Lorem Ipsum Generator
Generate predictable placeholder copy for layouts, prototypes, and content testing.
SQL Keyword Line-Breaker
Split dense one-line SQL into one clause per line with uppercase keywords — a readability pass, not a full syntax formatter.
JSON Diff Checker
Compare two JSON objects or arrays and get a clear, path-addressed report of added, removed, and changed values.
JSON Minifier
Validate and compress JSON into a single line, with exact before/after byte counts and an optional key-sorting step.
XML to JSON Converter
Convert XML to JSON and JSON to XML in your browser, mapping attributes and text nodes with predictable, documented rules.
CSV Formatter & Validator
Parse, validate, and reformat CSV with RFC 4180-correct quoting, custom delimiters, column consistency checks, and TSV output.
HTML Entity Encoder & Decoder
Escape text for safe embedding in HTML, and decode named or numeric entities (&, ', ©) back into plain text.
Image to Base64 Converter
Encode any image into a Base64 data URI entirely in your browser — ready for CSS, HTML, or JSON payloads.
Cron Expression Generator & Explainer
Generate a cron expression from a plain schedule picker, or paste an existing one to get a plain-English explanation and a field-by-field breakdown.
Creator Tools
8 toolsPrepare images and subtitles for social platforms and publishing workflows.
SRT and VTT Converter
Convert subtitle timing files between SRT and WebVTT while preserving cues and text.
Social Media Image Resizer
Resize and crop images to exact dimensions for Instagram, TikTok, YouTube, X, Facebook, LinkedIn, Pinterest, and Twitch locally in your browser.
QR Code Generator
Create QR codes for URLs, plain text, WiFi networks, and more — generated locally with adjustable size and error correction, downloadable as PNG.
YouTube Money Calculator
Estimate what your YouTube channel earns from ads: enter monthly views and an RPM (or CPM with monetized playback rate) and get daily, monthly, and yearly revenue ranges.
YouTube Watch Time Calculator
Work out exactly how many views (or videos) you need to hit the 4,000 public watch hours YouTube requires for monetization, based on your real average view duration.
YouTube Thumbnail Downloader
Paste a YouTube video URL or ID and get every thumbnail resolution YouTube stores for that video — from tiny 120×90 up to full 1280×720 maxres — ready to open or download.
Video Crop Ratio Calculator
Convert footage between aspect ratios without guessing: enter your source resolution and target ratio and see the exact crop window, safe-area percentages, and what remains visible.
Words to Time Calculator
Paste a script or enter a word count to estimate how long it takes to read silently, read aloud, or record as narration — with pace presets from slow documentary voice-over to fast speech.
Text Tools
13 toolsInteractive font tester, typography previewers, and text utility tools.
Font Tester
Professional online typography tool with 120+ fonts across 8 categories to test, preview, compare side-by-side, and customize typography in real-time with responsive controls, color palettes, and CSS or image export.
Text Case Converter
Convert any text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case in one click.
Remove Duplicate Lines
Strip duplicate lines from any list or text with optional case-insensitive comparison, whitespace trimming, and sorting.
Line Sorter
Sort any list of lines alphabetically, numerically, by length, in reverse, or shuffled randomly — with optional deduplication.
Text Diff Checker
Compare two blocks of text line by line with highlighted additions and removals — perfect for comparing drafts, config files, or code.
Find and Replace Text
Replace text across large bodies of content with literal or regular-expression matching, case control, and a live result preview.
Whitespace Remover & Text Cleaner
Clean pasted text in one pass: collapse multiple spaces, remove tabs, strip blank lines, join broken lines, and trim edges.
Reverse Text Generator
Flip text backwards character by character, reverse word order, or reverse the order of lines — instantly and locally.
URL Slug Generator
Convert any headline into a clean, lowercase, hyphen-separated URL slug with accent transliteration and optional stop-word removal.
Word & Character Counter
Live counts of words, characters (with and without spaces), lines, sentences, and paragraphs, plus an estimated reading time.
Text to Binary Converter
Encode text into UTF-8 binary bytes and decode binary strings back into readable text, with full Unicode support.
Text to ASCII Codes Converter
Show the ASCII/Unicode code point of every character in decimal, hexadecimal, or binary — and convert code lists back into text.
Unicode Character Inspector
Break any text into its Unicode characters with U+ code points, UTF-8/UTF-16 encodings, and flags for invisible or confusable characters.
SEO & Web
10 toolsMeta tag, Open Graph, robots.txt, sitemap, and URL utilities for webmasters.
Meta Tag Generator
Generate copy-paste-ready meta tags for your pages with a live Google-style search result preview and length guidance.
Open Graph & Twitter Card Generator
Generate Open Graph and Twitter/X Card tags so your links unfurl with the right title, description, and image on every social platform.
SERP Snippet Preview
Simulate the Google search result for your title, URL, and description — with truncation warnings based on real display limits.
Robots.txt Generator
Build a correct robots.txt file from presets and rules — including crawl-delay, sitemap declaration, and per-bot policies — ready to upload.
XML Sitemap Generator
Turn a list of URLs into a valid XML sitemap with per-URL priority, changefreq, and lastmod — validated and downloadable.
Canonical URL Generator
Normalize any URL into its canonical form and generate the matching <link rel="canonical"> tag with your preferred www/HTTPS/slash policy.
Structured Data (Schema.org) Generator
Generate valid JSON-LD structured data for six common schema types — FAQ, Article, Product, Organization, Local Business, and Breadcrumbs.
URL Parser & Inspector
Split any URL into its components — protocol, host, port, path, query parameters, and fragment — with every parameter decoded.
UTM Campaign URL Builder
Create properly formatted UTM tracking links for Google Analytics — with naming-convention hints and a live preview of the final URL.
Twitter/X Card Preview
See how a link will render as a card on X, Facebook, and LinkedIn before you publish — based on your OG and Twitter meta tags.
Calculators
19 toolsEveryday calculators for percentages, discounts, averages, ratios, and more.
Percentage Calculator
Three percentage calculations in one place: X% of a number, what percentage X is of Y, and the percentage change between two values.
Percentage Change Calculator
Measure the percentage increase or decrease between two numbers, or work backwards: what was the original value before a known change?
Discount Calculator
Compute the final sale price after one or two stacked percentage discounts, showing the total saved at every step.
Tip Calculator
Calculate the tip for any bill at any percentage and split the total evenly between any number of people, with per-person amounts.
Average, Median & Mode Calculator
Paste a list of numbers and get mean, median, mode, range, count, sum, and standard deviation with the formulas shown.
Ratio Calculator & Simplifier
Simplify ratios to lowest terms, scale one side of a ratio to a new value, and solve proportions for the missing number.
Rule of Three Calculator
Solve direct and inverse proportion problems — the classic rule of three — with every step shown so you can verify the reasoning.
Fraction Calculator
Add, subtract, multiply, and divide fractions — results are simplified automatically and shown as improper fractions and mixed numbers.
Random Number Generator
Generate one or many random numbers in any range using the browser’s cryptographic random source — with unique-only and sort options.
Odds Ratio Calculator
Compute the odds ratio from a 2×2 contingency table with 95% confidence interval and p-value — the standard measure of association for case-control studies.
Relative Risk Calculator
Compute relative risk from a 2×2 table with 95% confidence interval and p-value — the natural measure of association for cohort studies and randomized trials.
Sample Size Calculator
Find the minimum sample size for a survey or experiment: one-proportion studies with a margin of error, or two-group comparisons powered at 80% with α = 0.05.
Confidence Interval Calculator (Proportion)
Build a confidence interval for a proportion from successes and trials — with the Wilson interval that stays accurate for small samples and 0% or 100% results.
Confidence Interval Calculator (Mean)
Compute a confidence interval for a population mean from raw data or summary statistics, using the t-distribution — correct for the small samples the normal formula gets wrong.
RMSE & MAE Calculator
Paste paired predictions and observations to get RMSE, MAE, MAPE, bias, and R² — the standard error metrics for evaluating forecasts, models, and measurements.
Z-Score Calculator
Turn a raw value into a z-score — how many standard deviations it sits from the mean — and convert any z into a percentile rank and one/two-tailed probability.
P-Value Calculator
Convert a test statistic (z, t, or χ²) into its p-value — one- and two-sided — with plain-language guidance on what the number does and does not mean.
BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units, with the WHO category and the weight range that would land you in the healthy band.
Macronutrient Calculator
Turn a daily calorie target into gram targets for protein, carbs, and fat — using goal-based presets or a custom split, with the math shown so you can adjust it.
Date & Time
8 toolsDate difference, age, business days, week numbers, and time zone tools.
Date Difference Calculator
Find the exact duration between two dates in days, weeks, months, and years — with leap years and month lengths handled correctly.
Age Calculator
Compute exact age in years, months, and days from a birth date — plus total days lived and a countdown to the next birthday.
Business Days Calculator
Count working days between two dates, or find the date N business days from today — with configurable weekends and holiday exclusion.
Add or Subtract Days from Date
Add or subtract days, weeks, months, or years from any date — with correct end-of-month clamping (Jan 31 + 1 month = Feb 28/29).
Week Number Calculator
Get the ISO-8601 week number for any date, plus the quarter and day of year — or list every week of a year with start dates.
Time Zone Converter
Convert times between any IANA time zones with full daylight-saving awareness, plus a side-by-side world clock for scheduling calls.
Time Card Calculator
Enter a week of clock-in and clock-out times with unpaid breaks and get daily totals, overtime split, and decimal hours formatted for payroll.
Decimal Hours Calculator
Convert clock times (7:45) to payroll decimals (7.75) and back, with a reference table of the minute values that trip people up most often.
Colors
6 toolsContrast checkers, palette generators, gradients, and color harmonies.
WCAG Color Contrast Checker
Test foreground/background color pairs against WCAG 2.1 AA and AAA contrast requirements with a live text preview.
Color Palette Generator
Turn one base color into a full design-ready palette: tints, shades, and harmonic variations, each with HEX/RGB/HSL values.
CSS Gradient Generator
Design linear and radial CSS gradients with multiple stops and full angle control — previewed live, exported as clean CSS.
Color Mixer & Blender
Blend any two colors at any ratio with RGB and HSL mixing modes, showing the full gradient of intermediate steps.
Color Shades & Tints Generator
Expand any color into tints, shades, and tones in controlled steps — the systematic way to build scales for UI states.
HTML Color Codes Reference
Browse the named HTML/CSS color chart with hex, RGB, and HSL values side by side, or convert any custom color between the three formats with a live picker.