All tools

The complete ToolHubNest directory: 225 local AI, file, finance, everyday and crypto tools. Every one runs in your browser, no upload, no fee.

Local AI Tools 17

AI Background Removal

Cut subjects out of photos with clean, hair-level edges.

AI Text Summarizer

Condense articles and long documents into clear, faithful summaries.

Translate text between English, Spanish, Portuguese and Indonesian right in your browser.

AI Grammar Checker

Find grammar mistakes and explain why they're wrong.

AI Speech to Text

Transcribe audio recordings in 99 languages.

AI Image Captioner

Describe any image with accurate, accessible alt-text.

Rewrite text in 7 different writing styles.

AI Sentiment & Tone Analyzer

Analyze text tone and detect 28 emotions at a glance.

AI Object Detector

Detect 80 object classes in images with bounding boxes.

AI Content Detector

Score paragraphs for AI-generated vs human-written text.

AI Entity Extractor

Pull out people, organizations and places from text.

Turn photos into anime art in 3 distinct styles.

AI Image Upscaler

Upscale low-resolution images 2x or 4x with AI detail recovery.

AI Image Classifier

Identify what's in any image with top-5 predictions.

AI Subtitle Generator

Generate SRT and WebVTT subtitles from any video or audio.

AI Text to Speech

Convert text into natural-sounding speech, ready to export.

Image OCR — Text from Photos

Pull text out of photos and screenshots with a WASM OCR engine that runs entirely in your browser.

Privacy File Tools 59

Image Format Converter

WebP · PNG · JPG · HEIC. Batch drag & drop, no upload.

Image Compressor

Quality slider, before/after size. Avg 62% reduction.

PDF Merge & Split

Drag to reorder pages, extract pages. All local.

PDF to Image Converter

PNG · JPG · DPI picker · ZIP download. All local.

Base64 Encoder & Decoder

Text + files · URL-safe mode · Auto MIME detect.

CSV ↔ JSON Converter

CSV to JSON and JSON to CSV · typed values · all in-browser.

Markdown to HTML

Render Markdown to clean HTML · live preview · in-browser.

Color Converter

HEX ↔ RGB ↔ HSL · picker + CSS copy · in-browser.

SHA-1 / 256 / 384 / 512 · text + files · in-browser.

Resize images by pixels or % · preserve aspect · PNG/JPG/WebP · in-browser.

Side-by-side & inline · word/line level · in-browser.

Decode header & payload · no verification · in-browser.

CSS Gradient Generator

Linear & radial · color stops · copy CSS · in-browser.

Color Contrast Checker

WCAG AA/AAA · ratio · live preview · in-browser.

Favicon Generator

One image → all sizes · PNG + ICO · in-browser.

Image to Base64 Converter

Convert images to Base64 data URIs. HTML/CSS snippets, 100% local.

Color Palette Generator

Pick a base color, get a 6-step palette with HEX. In-browser.

Minify JavaScript, CSS and HTML by stripping comments and whitespace. See original vs minified size and savings. In-browser, no uploads, no tracking.

Image to WebP Converter

PNG/JPG/GIF → WebP · quality slider · instant size comparison · 100% in-browser.

PDF Text Extractor

Extract the text layer from any PDF file, page by page. Copy or download the text as .txt. The PDF is processed locally in your browser — it never leaves your device.

HEIC to JPG Converter

Convert iPhone HEIC photos to JPG or PNG in your browser · batch, quality slider, ZIP download. Nothing uploaded.

Split PDF into separate files · extract page ranges · chunk every N pages · pdf-lib, no upload.

Image to PDF Converter

Combine JPG, PNG, WebP or GIF images into one PDF in your browser · reorder, page size, margins. Fully offline.

Shrink PDF files in your browser with three quality presets and before and after size readouts — no upload.

Add text watermarks or page numbers to PDFs right in your browser — size, opacity, rotation, tiling, no upload.

Crop any image by dragging a selection box and export at full native resolution as PNG, JPEG, or WebP — no uploads.

SVG to PNG Converter

Turn an SVG file or pasted markup into a PNG at 1×, 2×, 4× or an exact width, with a transparent background.

Excel to JSON Converter

Convert XLSX, XLS, ODS, CSV or TSV spreadsheets into JSON objects or arrays right in your browser.

EXIF Viewer & Stripper

Inspect every EXIF tag hidden in a JPEG — camera, exposure, GPS — and download a cleaned copy, right in your browser.

Rotate PDF pages in 90° steps and remove unwanted ones in your browser — original quality, no upload.

Image Flip & Rotate

Rotate photos 90/180/270 degrees and mirror them horizontally or vertically in batch, right in your browser.

Image Watermark

Stamp text or copyright watermarks on photos with font, opacity and position controls plus a live preview.

Compress Image to Size

Hit an exact KB target: the tool searches JPEG quality and, if you allow it, downscales until your image fits.

Beautify and validate XML with 2- or 4-space indent and CDATA kept. Parse errors show the exact line, offline.

Convert XML to JSON and back with one documented, stable mapping. Attributes, arrays and text round-trip.

Minify HTML safely: cut comments and whitespace, keep script, style and pre blocks byte-for-byte, no upload.

Format SQL for MySQL, PostgreSQL, SQLite, BigQuery and standard dialects with your case and indent, offline.

curl to JavaScript

Paste a curl command and get runnable fetch or axios code, with dropped flags kept visible as honest comments.

Base64 to Image

Decode a base64 string or data URI back into an image with format sniffing, live preview, size stats and download.

HEX to RGB Converter

Convert colors between hex, RGB and HSL with a live picker, four CSS output formats and copy buttons on each.

Color Blindness Simulator

Preview an image or palette through deuteranopia, protanopia, tritanopia and achromatopsia, right in your browser.

Aspect Ratio Calculator

Reduce any size to its simplest ratio, fit images to 16:9 or 9:16 targets, and check common resolutions.

Barcode Generator

Create scannable CODE128, EAN, UPC, CODE39, ITF or Codabar barcodes as SVG or PNG, right in your browser.

Generate the WPA QR code guests scan to join your Wi-Fi. Supports hidden networks and special characters.

Build a contact card as a scannable vCard 3.0 QR code with live preview, PNG and .vcf export, in your browser.

Count PDF pages instantly in your browser and see the file size, every distinct page size, and the title.

PDF Page Numbers

Stamp page numbers on a PDF in your browser: pick the position, the Page n of N format, start number, cover skip.

Draw a signature, drop a PDF and stamp it on any page by millimetre position — right in your browser.

PDF Metadata Editor

View and rewrite a PDF's document info — title, author, subject, keywords, creator, producer — right in your browser.

Convert Word .docx to a printable PDF in your browser with mammoth: images and tables kept, no upload.

Convert Excel or ODS spreadsheets to clean CSV with a choice of delimiter and RFC-style quoting. Nothing uploads.

Turn CSV or TSV text into a real .xlsx workbook with a named sheet, preview and offline parsing. Nothing uploads.

Convert AVIF photos to JPG or PNG in batches with your browser’s own decoder. Quality control, ZIP download, no uploads.

Image Color Picker

Pick exact pixel colors from any image with a magnifier loupe or the eyedropper API, then copy or export the palette.

Hide faces, plates or documents behind strong pixelation or Gaussian blur boxes, then export PNG or JPEG offline.

Trace PNG or JPG into scalable SVG vector paths in your browser — presets for logos, icons and photos.

Passport Photo Maker

Crop any photo to official passport sizes like 2×2 in or 35×45 mm with a face guide and 4×6 print sheet.

Signature Generator

Draw or type your signature and export a transparent PNG or vector SVG at up to 3× scale. Runs fully in your browser.

Invoice Generator

Build a clean A4 invoice PDF with logo, line items, tax and totals in your browser. Draft stays on this device.

Cross-border Finance 30

Cross-border Mortgage

US APR · EU nominal · Brazil TAXA. Full amortization, CSV export.

Multi-Currency Converter

16+ currencies, live rates with offline cache, fee breakdown.

Cross-border Tax Estimator

US Sales Tax · EU VAT · Brazil ICMS. Adjustable rates.

EMI Loan Calculator

Equal Monthly Installment vs principal-only plan comparison.

Compound Interest Calculator

Monthly · Quarterly · Yearly · Continuous compounding + APY.

Salary PPP Adjuster

Brazil BRL · US USD · Portugal EUR purchasing power comparison.

FIRE Retirement Calculator

Nest egg target with 4% rule and year-by-year projections.

VAT Reverse Calculator

Tax-inclusive ↔ tax-exclusive with multi-country default rates.

Inflation Calculator

Past and future purchasing power · custom rates · in-browser.

Salary Converter

Hourly ↔ monthly ↔ yearly · work hours · in-browser.

Discount Calculator

Final price, savings, % off · stack discounts · in-browser.

Dollar-Cost Averaging (SIP) Calculator

Investment value over time · monthly contribution · in-browser.

Loan Prepayment Calculator

Interest saved & term reduced · extra payments · in-browser.

Credit Card Payment Calculator

Min vs full payoff · total interest · payoff time · in-browser.

US Income Tax Calculator

Estimate your 2024 US federal income tax with full bracket breakdown, average and marginal rates. Supports single, married filing jointly and head of household with standard deduction. 100% in-browser.

Car Loan Calculator

Calculate your monthly car payment, total interest and payoff schedule from price, down payment, APR and term. Compare extra payments to save interest. 100% in-browser, no sign-up.

Property Tax Calculator

US property tax · annual & monthly · rate comparison · in-browser.

401k Calculator

401k retirement projection · employer match · compound growth · in-browser.

Mortgage Refinance Calculator

Compare your current mortgage against a refinance: new payment, total interest savings, break-even month and closing costs. 100% in-browser.

Debt Payoff Calculator

Plan paying off multiple debts with the Snowball or Avalanche strategy. See total payoff time, total interest and the order debts get cleared. 100% in-browser.

Savings Goal Calculator

Find out exactly how much to save each month to hit your goal by a target date, with interest growth factored in. 100% in-browser, no sign-up.

Calculate your return on investment: total ROI, annualized ROI (simple and compound) and profit multiple from cost and final value. 100% in-browser.

Break-Even Calculator

Find the exact number of units (or dollars) you need to sell to cover your costs, with a simple revenue-vs-cost chart and profit margin. 100% in-browser.

Estimate a lump-sum bank deposit: maturity amount, interest earned, effective yield and date. Offline.

Rent Affordability

Reverse the 30% rule: turn gross income into a maximum rent, or a rent into the income you would need.

Set your safety-net target at 3–12 months of essential expenses and get the monthly savings plan.

Price a trip's fuel in L/100 km, km/L or US MPG: total cost, litres or gallons needed, and cost per mile.

Electricity Cost

Estimate appliance kWh and what they cost you monthly and yearly at your tariff, up to five devices.

FIRE Calculator

Estimate your FIRE number, years to financial independence and the Coast-FIRE point with a monthly simulation.

House Affordability

See the home price your income supports with the 28/36 DTI rules, PMI costs, and down-payment savings limits.

Daily Tools 87

WHO vs Asia standard — side by side comparison.

Metric · Imperial · Indonesian local units like tumbak.

Word & Character Counter

CJK chars vs English words — accurate per-language count.

QR Code Generator

Custom colors · sizes · vCard · WiFi — all in your browser.

Time Zone Converter

Instant DST-aware conversion between 9 major time zones.

Percentage Calculator

Four percentage modes — X% of Y, reverse, margin, mark-up.

Date Difference Calculator

Days, weeks, months, years between any two dates, plus age.

Exact age, days lived, next birthday, Chinese and Western zodiac.

JSON Formatter & Validator

Pretty print, minify, validate JSON with line+column error detection.

Password Generator

Cryptographically secure · length + charset options · in-browser.

Number Base Converter

Binary · octal · decimal · hex, convert both ways · in-browser.

RFC 4122 v4 · batch generate · cryptographically random · in-browser.

Tip % · split bill · 15/18/20/25% quick buttons · in-browser.

Scientific Calculator

Trig, log, powers, constants · degree/radian · in-browser.

Countdown Timer

Days/hours/minutes/seconds to a date · live · in-browser.

4.0 scale · weighted by credits · in-browser.

Focus sprints · break cycles · auto-cycles · in-browser.

Regular Expression Tester

Live match highlighting · groups · flags · in-browser.

Unix Timestamp Converter

Unix ↔ human date · multiple formats · live · in-browser.

Stopwatch Timer

Millisecond-precision stopwatch with laps. Start, pause, reset — all in your browser.

Text Case Converter

Convert any text to UPPERCASE, lowercase, Title Case, sentence case, camelCase, snake_case, kebab-case and PascalCase. Instant, in-browser, no uploads.

Lorem Ipsum Generator

Placeholder text by paragraphs, sentences or words. In-browser, no uploads.

Turn any title into a clean URL slug. Live, in-browser, no uploads.

IP Address Tool

Analyze any IPv4 or IPv6 address: validity, private/public, binary, subnet mask and CIDR range. Pure in-browser parsing, no network requests, no tracking.

Random Number Generator

Generate true random numbers in any range, with deduplication and multiple output formats. Uses your browser's crypto engine — no uploads, no tracking.

Unique Word Counter

Total, unique and repeated word counts · top-20 frequency chart · in-browser.

Roman Numeral Converter

1–3999 ↔ Roman numerals · two-way · symbol breakdown · in-browser.

Markdown Live Editor

Write Markdown and see the rendered HTML live in a split view. Zero-dependency parser, word/line stats, copy HTML or download the file. In-browser, no uploads.

Text Cipher Tool

Encode and decode text with Caesar shift, ROT13, Atbash, reverse, Base64 and Hex. Instant encryption/decryption in your browser — no uploads, no tracking.

Text Whitespace Cleaner

Clean up messy text: collapse multiple spaces, trim lines, merge blank lines, normalize line endings. See before/after stats. Instant, in-browser, no uploads.

Readability Calculator

Analyze the readability of any English text with Flesch Reading Ease, Flesch-Kincaid grade, Gunning Fog and SMOG. Instant scoring in your browser.

Duplicate Line Remover

Remove duplicate lines from any text. Ignore case and whitespace, keep the first or last occurrence, and see exactly which lines were repeated. Instant, in-browser.

Date & Time Formatter

Format any date into ISO, RFC 2822, 12/24h, Unix and custom token templates. Copy any format in one click. Instant, in-browser, no uploads.

QR Code Scanner

Read QR codes with your camera or from an image file · jsQR decoding runs offline on-device · no upload.

URL Encoder/Decoder

Encode or decode URLs with percent encoding, space-as-plus form style and instant error checks. Nothing uploads.

HTML Entity Encoder/Decoder

Escape or unescape the five dangerous HTML characters and decode named or numeric entities instantly. Runs offline.

Cron Expression Parser

Explain a 5-field crontab expression in plain English and list the next 10 run times in your own timezone, offline.

JSON to YAML Converter

Convert JSON to YAML and back instantly in your browser — paste or load a file, then copy or download the result.

Search 850+ emoji by name or keyword and copy with one tap. Group tabs and a recent list, fully offline.

Random Wheel Picker

Spin a customisable name wheel with crypto-random winners, raffle mode and a history. Draws entirely offline.

Roll d4–d100 or custom dice with modifiers and history, plus a coin flip. Provably uniform crypto rolls, offline.

Typing Speed Test

Take a 60-second or free-form WPM test against a built-in bank of English passages — scored in your browser.

Reaction Time Test

Test your reflexes in five rounds: median, average and best reaction time in milliseconds — no account, no uploads.

Click Speed Test

Test your clicks-per-second over 5, 10, or 60 seconds: total clicks, average CPS, and your best single second.

Morse Code Translator

Translate text to Morse code and back, with adjustable audio playback at 10–30 WPM — runs fully offline.

Word Frequency Counter

Count word frequencies in any text or .txt file: top words, percentages, chart and CSV export — all offline.

Mock JSON Data Generator

Generate fake JSON records for dev and testing with 13 toggleable fields, seeded data and test emails.

Random Team Generator

Split names into random teams with a fair Fisher-Yates crypto shuffle, two deal modes, per-team copy.

UUID v7 Generator

Create time-ordered UUIDv7 identifiers (RFC 9562) with Web Crypto, or random v4s for comparison.

HTTP Status Codes

Search 46 HTTP status codes with one-line summaries and fix notes — causes, retries, redirects.

Record your mic to a WebM/MP4 file with live level meter and timer. Nothing uploads — it stays local.

A drift-free browser metronome from 40 to 208 BPM with accented downbeats, subdivisions and tap tempo.

Grade Average Calculator

Weighted course grade calculator with editable rows, automatic weight normalization and US, UK or numeric letter scales.

Unit Price Calculator

Compare grocery prices per gram, litre or piece and spot the real best value with unit-price math. Works fully offline.

Add or subtract days, weeks, months or years from any date, count workdays and see the weekday of each result, offline.

Compare two JSON docs with a per-path diff tree: equal, changed, added or removed. No upload.

Open CSV, TSV or Excel as a sortable table with filters, pagination and cleaned CSV re-export. No upload.

Markdown Table Formatter

Align ragged markdown tables into padded columns, compact form, or HTML table markup. Alignment kept. Local.

Data Size Converter

Convert sizes across SI and IEC units, see both ladders, transfer time at your Mbps speed. No upload.

Split a URL into scheme, host, port, path, decoded params, fragment and userinfo. Raw and decoded views.

Robots.txt Generator

Build a robots.txt file visually: per-crawler rules, Allow and Disallow paths, sitemap lines and a live preview.

Sitemap.xml Generator

Turn a list of URLs into a valid sitemap.xml with lastmod dates and global hints, previewed live in-browser.

Meta Tag Generator

Build title, description, robots, Open Graph and Twitter Card tags with live character counters — right in your browser.

UTM Link Builder

Tag any URL with the five UTM parameters for campaign tracking, with live preview, a QR code and saved links on-device.

App Icon Generator

Turn one square PNG into every iOS, Android, PWA and macOS icon size, packed in a ZIP. Resizing happens in-browser.

Flexbox Generator

Build flexbox layouts visually: set container and per-child flex values on a live stage, then copy the CSS.

CSS Grid Generator

Build CSS grid layouts visually: paint named areas, set tracks and gaps, then copy the generated grid CSS.

Box Shadow Generator

Stack layered CSS box-shadows visually: offset, blur, spread, color and inset sliders, live preview, one-click copy.

Border Radius Generator

Dial in CSS rounded corners and blobs with one, four, or eight radius sliders, live preview, copy-ready CSS.

Keyboard Tester

Test every key on your keyboard in the browser: per-key hit counters, stuck-key alerts and a last-key readout.

Screen Resolution Checker

Check your screen resolution, viewport size, pixel ratio, refresh rate estimate and pointer type, live in the browser.

Dead Pixel Test

Flash solid colors, gradients and moving bars full screen to find dead or stuck pixels on any monitor or phone.

Camera & Mic Test

Check your webcam and mic before a meeting: live preview, device picker, level meter and a 440 Hz speaker beep.

Play test tones from 20 to 20,000 Hz with sine, square, triangle or saw waves, frequency sweeps, and left-right balance.

White, pink and brown noise generated in your browser, with volume, a low-pass filter, fades and a sleep timer.

Trim MP3, WAV, M4A or OGG clips in your browser: drag waveform handles, preview fades, and export lossless WAV.

X Character Counter

Live X character counter for tweets, bios and names: links cost 23, emoji count as 2, like the app.

Company Name Generator

Brainstorm brand names from one keyword across six proven naming styles, heart a shortlist and copy it. Fully offline.

Passphrase Generator

Build memorable diceware-style passphrases with crypto randomness from a 1,143-word list, with entropy readout. Offline.

Password Strength Checker

Score a password on length, classes, common-list and sequence checks with entropy math — nothing typed ever leaves.

Add top and bottom captions to any image in the classic Impact meme style and export a PNG right in your browser.

Turn short text into big figlet-style ASCII art banners with three classic fonts, fully offline in browser.

Fraction Calculator

Add, subtract, multiply or divide fractions and simplify any one, with exact reduced answers and every step shown.

Exponent Calculator

Compute powers, roots, e^x and ln(x) with exact big integers where possible, scientific notation, and honest edge notes.

Prime Factorization Calculator

Split numbers up to 10^14 into primes, with the divisor list and count, a primality badge, and division-ladder steps.

LCM & HCF Calculator

Least common multiple and greatest common factor for up to 10 numbers, with three worked methods and a check.

Standard Deviation Calculator

Get mean, median, mode, variance, sample and population standard deviation, MAD, CV%, and a histogram from any data set.

Health Tools 16

Calorie Calculator

Daily calorie estimate with the Mifflin-St Jeor equation: BMR, activity-adjusted TDEE, goal target and macros.

Body Fat Calculator

Body fat percentage from tape measurements with the US Navy formula: fat and lean mass plus ACE categories.

Sleep Cycle Calculator

Work out the best bedtime from your alarm, or a wake time from your bedtime, with 90-minute sleep cycles.

Pregnancy Due Date Calculator

Estimate your due date from your last period or conception date, with today's gestational age and trimester.

Heart Rate Zone Calculator

Calculate your five heart-rate training zones from age and resting pulse, with % of max and Karvonen targets.

Running Pace Calculator

Turn a goal time into pace per km or mile with a cumulative split table, or predict a finish time from pace.

Water Intake Calculator

Daily water target in liters, cups and 500 ml bottles by weight, activity and climate. Runs in your browser.

Ideal Weight Calculator

Ideal weight ranges from four published formulas plus a BMI screening band, in kg and lb. Runs fully in your browser.

Height Predictor

Predict a child's adult height with the mid-parental method from the parents' heights, with an honest range.

Ovulation Calculator

Estimate your ovulation day and fertile window from your last period start and average cycle length, offline.

Breathing Timer

Guided breathing pacer with Box, 4-7-8, Calm and custom patterns, following one expanding circle. Silent, offline.

Steps Calculator

Turn daily steps into distance and calorie estimates from height, weight and pace. Runs fully in your browser.

Weight Gain in Pregnancy

Check the Institute of Medicine reference range for total pregnancy weight gain and weekly pace from your BMI.

One Rep Max Calculator

Estimate your 1RM with three published formulas plus a percentage table for training. Runs in your browser.

Dog Age Calculator

Convert dog years to human years with the vets' size-curve model, not the old multiply-by-7 rule.

Chinese Zodiac Calculator

Find your Chinese zodiac animal and element by exact birth date, using real New Year boundary dates.

Crypto Tools 16

Brazil Crypto Tax Calculator

Crypto profit · BRL 35k exemption · 15% IRPF · loss carry-forward.

Exchange Fee Calculator

Spot + futures taker/maker fees · multiple exchanges · in-browser.

Crypto P&L Calculator

Buy/sell history · average cost · realized + unrealized · in-browser.

Grid Trading Calculator

Grid levels, per-grid profit & total · spot grid · in-browser.

Staking APR Calculator

Simple & compound staking rewards · lockup · in-browser.

Impermanent Loss Calculator

LP position IL · price ratio · in-browser.

Bitcoin Halving Countdown

Next halving · block reward · supply · in-browser.

Ethereum Gas Fee Calculator

Estimate your Ethereum transaction gas fee from gas price (Gwei) and gas limit. See the cost in ETH and USD. Pure in-browser math, no RPC calls.

DeFi Loan Health Calculator

LTV, health factor & liquidation price · DeFi loan safety · in-browser.

Staking vs Holding Calculator

Staking APR vs holding over 1-10 years · price-growth scenario · in-browser.

Crypto Unit Converter

BTC ↔ sats · ETH ↔ gwei ↔ wei · exact in-browser math · no upload.

Simulate dollar-cost averaging on eight major coins with real CoinGecko price history, compared to a lump-sum buy.

Position Size Calculator

Size crypto and futures trades from your risk percent: position size, quantity, margin, liquidation.

Vesting Schedule Calculator

Model a token grant with cliff and monthly vesting: unlocked and locked amounts plus the next unlock event date.

Market Cap to Price

Convert between market cap, token price and circulating supply: fill two fields and the missing value appears.

Leverage Calculator

Estimate the isolated-margin liquidation price with fees, position size and the distance to liquidation offline.