# Toolio

> Free online tools — calculators, BMI, PDF & image tools, converters, QR, password generator, JSON, timers & 150+ more. No install, no login, works offline. Free, no login, no upload — every tool runs entirely client-side in the browser and works offline. Available in 6 languages: English, 한국어, Español, Deutsch, 日本語, Tiếng Việt.

## Tools

- [Video Frame Grabber](https://toolio.pongvn.com/tools/video-frame-grab): Capture any frame of a video as a PNG — instant, in your browser.
- [Audio Converter](https://toolio.pongvn.com/tools/audio-converter): Convert audio between MP3, WAV, M4A, OGG, FLAC, AAC.
- [Audio Trimmer / Cutter](https://toolio.pongvn.com/tools/audio-trim): Cut a section from an MP3 or audio file by start/end time.
- [Audio Compressor (MP3)](https://toolio.pongvn.com/tools/audio-compress): Reduce audio/MP3 file size by lowering the bitrate.
- [GIF to MP4](https://toolio.pongvn.com/tools/gif-to-mp4): Convert an animated GIF to a smaller MP4 video.
- [Change Video Speed](https://toolio.pongvn.com/tools/video-speed): Speed up or slow down a video (slow-mo / fast forward).
- [Rotate Video](https://toolio.pongvn.com/tools/video-rotate): Rotate a video 90° or 180° (fix sideways phone clips).
- [Compress PDF](https://toolio.pongvn.com/tools/pdf-compress): Reduce PDF file size right in your browser — no upload, free.
- [Video Compressor](https://toolio.pongvn.com/tools/video-compress): Compress video to a smaller file in your browser — no upload.
- [Video Trimmer / Cutter](https://toolio.pongvn.com/tools/video-trim): Cut a clip from a video by start and end time — in your browser.
- [Video Converter](https://toolio.pongvn.com/tools/video-convert): Convert video between MP4, WebM, MOV, MKV and GIF — in your browser.
- [Mute Video (Remove Audio)](https://toolio.pongvn.com/tools/video-mute): Remove the audio track from a video — fast, in your browser.
- [Calorie / TDEE Calculator](https://toolio.pongvn.com/tools/calorie-tdee): Calculate your BMR and daily calorie needs (TDEE).
- [Pregnancy Due Date Calculator](https://toolio.pongvn.com/tools/due-date): Estimate your baby's due date from your last period.
- [VAT Calculator](https://toolio.pongvn.com/tools/vat-calculator): Add or remove VAT / sales tax — net, tax and gross.
- [Text to Speech](https://toolio.pongvn.com/tools/text-to-speech): Read any text aloud in your browser with natural voices.
- [Website Screenshot](https://toolio.pongvn.com/tools/website-screenshot): Capture a full-page screenshot of any website (PNG).
- [HTML to PDF](https://toolio.pongvn.com/tools/html-to-pdf): Convert HTML to a pixel-perfect PDF (real browser engine).
- [URL Shortener](https://toolio.pongvn.com/tools/url-shortener): Turn a long link into a short, shareable URL.
- [Is It Down? (Website Status)](https://toolio.pongvn.com/tools/website-status): Check if a website is up or down, with response time.
- [HTTP Header Checker](https://toolio.pongvn.com/tools/http-headers): Inspect the HTTP response headers of any URL.
- [Email Validator](https://toolio.pongvn.com/tools/email-checker): Check if an email is valid and its domain can receive mail (MX).
- [Background Remover](https://toolio.pongvn.com/tools/bg-remover): Remove the background from any image automatically (AI) — transparent PNG.
- [Image to Text (OCR)](https://toolio.pongvn.com/tools/image-to-text): Extract text from images in 13+ languages — free OCR.
- [Currency Converter](https://toolio.pongvn.com/tools/currency-converter): Live exchange rates for 160+ currencies.
- [What Is My IP](https://toolio.pongvn.com/tools/my-ip): Your public IP address and location, instantly.
- [DNS Lookup](https://toolio.pongvn.com/tools/dns-lookup): Look up A, AAAA, MX, TXT, NS, CNAME records.
- [Open Graph Checker](https://toolio.pongvn.com/tools/og-checker): Preview how a URL looks when shared (OG/meta tags).
- [Word to PDF](https://toolio.pongvn.com/tools/word-to-pdf): Convert Word documents (.docx) to PDF — free, high quality.
- [Excel to PDF](https://toolio.pongvn.com/tools/excel-to-pdf): Convert Excel spreadsheets (.xlsx) to PDF — free, high quality.
- [PowerPoint to PDF](https://toolio.pongvn.com/tools/ppt-to-pdf): Convert PowerPoint (.pptx) presentations to PDF — free.
- [HWP to PDF](https://toolio.pongvn.com/tools/hwp-to-pdf): Convert Hangul (.hwp) documents to PDF — no Hancom Office needed.
- [Scratchpad](https://toolio.pongvn.com/tools/notepad): Auto-saving notepad with tabs.
- [Checklist](https://toolio.pongvn.com/tools/todo): Jot tasks and check them off.
- [Kanban Board](https://toolio.pongvn.com/tools/kanban): To-do / Doing / Done columns.
- [JSON Formatter](https://toolio.pongvn.com/tools/json): Beautify, minify, validate.
- [Base64](https://toolio.pongvn.com/tools/base64): Encode / decode text ↔ Base64.
- [URL Encoder](https://toolio.pongvn.com/tools/url): Encode / decode + query parser.
- [Unit Converter](https://toolio.pongvn.com/tools/unit): Length, weight, temp, area, speed…
- [Time Zones](https://toolio.pongvn.com/tools/timezone): Compare a moment across cities.
- [Regex Tester](https://toolio.pongvn.com/tools/regex): Live match, groups, replace.
- [Color Converter](https://toolio.pongvn.com/tools/color): HEX · RGB · HSL + palette.
- [Hash Generator](https://toolio.pongvn.com/tools/hash): SHA-1 / 256 / 384 / 512.
- [Pomodoro Timer](https://toolio.pongvn.com/tools/pomodoro): 25-min focus · 5-min break.
- [Calculator](https://toolio.pongvn.com/tools/calculator): Keyboard-friendly, with history.
- [D-day Counter](https://toolio.pongvn.com/tools/dday): Days until / since a date.
- [World Clock](https://toolio.pongvn.com/tools/worldclock): Several cities, ticking live.
- [Stopwatch](https://toolio.pongvn.com/tools/stopwatch): Stopwatch with lap times.
- [Password Maker](https://toolio.pongvn.com/tools/password): Strong random passwords + meter.
- [Typing Speed Test](https://toolio.pongvn.com/tools/typing-speed): Measure WPM and accuracy with timed passages.
- [Markdown Editor](https://toolio.pongvn.com/tools/markdown): Live preview + export.
- [Table ↔ CSV](https://toolio.pongvn.com/tools/csv): CSV · TSV · Markdown table.
- [Word Count](https://toolio.pongvn.com/tools/wordcount): Chars, words, lines, read time.
- [Text Tools](https://toolio.pongvn.com/tools/textcase): Case, sort, dedupe, trim.
- [Text Diff](https://toolio.pongvn.com/tools/diff): Line-by-line difference.
- [Image Compressor](https://toolio.pongvn.com/tools/image-compress): Compress JPG, PNG, WebP images in-browser — no upload.
- [Image Resizer](https://toolio.pongvn.com/tools/image-resize): Resize images offline — lock ratio, presets.
- [Image Format Converter](https://toolio.pongvn.com/tools/image-convert): Convert images to PNG, JPEG or WebP offline.
- [Video to GIF](https://toolio.pongvn.com/tools/video-to-gif): Turn a video clip into an animated GIF in-browser.
- [GIF Upscaler](https://toolio.pongvn.com/tools/gif-upscale): Enlarge animated GIFs 2×–4× — sharp or smooth.
- [Image Cropper](https://toolio.pongvn.com/tools/image-crop): Drag a crop box, pick a ratio, download.
- [Meme Generator](https://toolio.pongvn.com/tools/meme-generator): Add Impact-style meme text to images, download PNG.
- [Color Picker from Image](https://toolio.pongvn.com/tools/color-picker-from-image): Hover over an image to sample pixel colors instantly.
- [Color Palette from Image](https://toolio.pongvn.com/tools/palette-from-image): Extract dominant color swatches from any image.
- [Percentage Calculator](https://toolio.pongvn.com/tools/percentage): Three live calculators for every percent problem.
- [Age Calculator](https://toolio.pongvn.com/tools/age-calculator): Exact age plus totals and next birthday.
- [BMI Calculator](https://toolio.pongvn.com/tools/bmi): Calculate BMI instantly — metric or imperial.
- [Compound Interest](https://toolio.pongvn.com/tools/compound-interest): Future value with compound interest and deposits.
- [Korean Age Calculator](https://toolio.pongvn.com/tools/korean-age): Birth date to all three Korean age systems.
- [Korean Salary Calculator](https://toolio.pongvn.com/tools/korean-salary): Estimate monthly net pay after Korean taxes.
- [GPA Calculator](https://toolio.pongvn.com/tools/gpa): Weighted GPA from grades and credits, 4.0 or 4.5.
- [Loan & Mortgage Calculator](https://toolio.pongvn.com/tools/loan-mortgage): Monthly payment, interest total, amortization schedule.
- [Scientific Calculator](https://toolio.pongvn.com/tools/scientific-calc): Trig, log, roots, factorial — safe offline evaluator.
- [Discount Calculator](https://toolio.pongvn.com/tools/discount-calculator): Final price and savings for any sale or stacked deal.
- [Sleep Calculator](https://toolio.pongvn.com/tools/sleep-calculator): Bedtime or wake-up times based on 90-min sleep cycles.
- [Date Difference Calculator](https://toolio.pongvn.com/tools/date-difference): Days, weeks, months, years between two dates.
- [Unix Timestamp Converter](https://toolio.pongvn.com/tools/timestamp): Live epoch clock, two-way timestamp ↔ date.
- [UUID Generator](https://toolio.pongvn.com/tools/uuid): Generate secure v4 UUIDs with format options.
- [JWT Decoder](https://toolio.pongvn.com/tools/jwt-decoder): Decode JWT header & payload locally, nothing sent.
- [Number Base Converter](https://toolio.pongvn.com/tools/number-base): Convert binary, octal, decimal, hex and custom bases.
- [Cron Explainer](https://toolio.pongvn.com/tools/cron-explainer): Decode any cron expression with next run times.
- [Meta Tag Generator](https://toolio.pongvn.com/tools/meta-tags): Generate SEO, Open Graph, and Twitter Card meta tags.
- [Aura Color Quiz](https://toolio.pongvn.com/tools/aura-color): 10 vibe questions reveal your inner aura color.
- [Era Identity Quiz](https://toolio.pongvn.com/tools/era-identity): 10 questions reveal which era you're living in.
- [Brainrot Level Test](https://toolio.pongvn.com/tools/brainrot): 12 questions reveal how deep the internet has rotted your brain.
- [Aura Points Calculator](https://toolio.pongvn.com/tools/aura-points): Check your week's deeds and discover your aura level.
- [Aesthetic Core Quiz](https://toolio.pongvn.com/tools/aesthetic-core): 10 questions reveal your true aesthetic archetype.
- [SBTI Personality Parody](https://toolio.pongvn.com/tools/sbti): Silly behavior quiz reveals your absurd personality type.
- [Spin the Wheel](https://toolio.pongvn.com/tools/wheel-decider): Spin a colorful wheel to pick a random winner.
- [Random Number Generator](https://toolio.pongvn.com/tools/random-number): Secure random integers or decimals instantly.
- [Color Palette Generator](https://toolio.pongvn.com/tools/color-palette): 5-color palettes with lock, harmony modes, copy.
- [CSS Gradient Generator](https://toolio.pongvn.com/tools/css-gradient): Build linear or radial gradients visually, copy CSS.
- [CSS Box-Shadow Generator](https://toolio.pongvn.com/tools/box-shadow): Layer multi-shadow effects visually, copy ready CSS.
- [Border-Radius Generator](https://toolio.pongvn.com/tools/border-radius): Sliders per corner, live preview, blob randomize, copy CSS.
- [Lorem Ipsum Generator](https://toolio.pongvn.com/tools/lorem-ipsum): Placeholder text by paragraphs, sentences, or words.
- [QR Code Generator](https://toolio.pongvn.com/tools/qr): Turn any text or URL into a QR code instantly.
- [Image to PDF](https://toolio.pongvn.com/tools/image-to-pdf): Combine JPG & PNG images into one PDF in-browser.
- [PDF to Image](https://toolio.pongvn.com/tools/pdf-to-image): Convert PDF pages to PNG or JPG in-browser.
- [PDF Merge](https://toolio.pongvn.com/tools/pdf-merge): Combine multiple PDFs into one, in-browser.
- [PDF Splitter](https://toolio.pongvn.com/tools/pdf-split): Extract pages or split a PDF — no upload.
- [PDF Rotate](https://toolio.pongvn.com/tools/pdf-rotate): Rotate PDF pages 90, 180 or 270° — no upload.
- [PDF Watermark](https://toolio.pongvn.com/tools/pdf-watermark): Stamp a text watermark on every PDF page.
- [Tip Calculator](https://toolio.pongvn.com/tools/tip-calculator): Split bill and tip by party size instantly.
- [Find & Replace](https://toolio.pongvn.com/tools/find-replace): Bulk find and replace with regex & case options.
- [Word Frequency Counter](https://toolio.pongvn.com/tools/word-frequency): Count word occurrences with a frequency table.
- [Remove Line Breaks](https://toolio.pongvn.com/tools/remove-line-breaks): Strip or replace line breaks from any text.
- [Slugify](https://toolio.pongvn.com/tools/slugify): Turn any text into a clean URL slug.
- [UTM URL Builder](https://toolio.pongvn.com/tools/utm-builder): Build GA tracking URLs with UTM parameters.
- [Contrast Checker (WCAG)](https://toolio.pongvn.com/tools/contrast-checker): Check WCAG AA/AAA pass for any two colors.
- [Coin Flip](https://toolio.pongvn.com/tools/coin-flip): Flip a fair crypto-random coin with a tally.
- [Math Maze](https://toolio.pongvn.com/tools/math-maze): Reach the target number through an operator maze.
- [Remove Duplicate Lines](https://toolio.pongvn.com/tools/remove-duplicates): Remove duplicate lines from a list, with a removed count.
- [List Sorter](https://toolio.pongvn.com/tools/list-sort): Sort lists A–Z, numerically, by length or reverse.
- [Text Reverser & Fonts](https://toolio.pongvn.com/tools/text-reverse): Reverse text or convert to Unicode font styles.
- [SNS Character Counter](https://toolio.pongvn.com/tools/sns-char-count): Track char & byte counts vs social platform limits.
- [Password Strength Meter](https://toolio.pongvn.com/tools/password-strength): Score password strength and crack time as you type.
- [Secret Key Generator](https://toolio.pongvn.com/tools/secret-key-gen): Generate secure random keys in hex or base64.
- [HTML Entity Encoder](https://toolio.pongvn.com/tools/html-entity): Encode or decode HTML entities in real time.
- [Unit Price Comparer](https://toolio.pongvn.com/tools/unit-price): Compare price per unit across products.
- [Image to Base64](https://toolio.pongvn.com/tools/image-to-base64): Convert an image to a Base64 data URI.
- [EXIF Metadata Remover](https://toolio.pongvn.com/tools/exif-remove): Strip GPS & camera metadata from photos in-browser.
- [Subtitle (SRT) Shifter](https://toolio.pongvn.com/tools/srt-shift): Shift or rescale SRT subtitle timings in-browser.
- [Multi Timer](https://toolio.pongvn.com/tools/multi-timer): Run several named countdown timers at once.
- [Screen Recorder](https://toolio.pongvn.com/tools/screen-recorder): Record your screen to a WebM video, in-browser.
- [Extract Audio from Video](https://toolio.pongvn.com/tools/audio-extract): Pull the audio track from a video as MP3 or WAV.
- [Margin Calculator](https://toolio.pongvn.com/tools/margin-calculator): Find the selling price for a target profit margin.
- [Break-Even Calculator](https://toolio.pongvn.com/tools/bep-calculator): Find the units needed to break even.
- [Burn Rate & Runway](https://toolio.pongvn.com/tools/burn-rate): See how many months of cash runway you have left.
- [LTV Calculator](https://toolio.pongvn.com/tools/ltv-calculator): Estimate customer LTV and your LTV:CAC ratio.
- [NPS Calculator](https://toolio.pongvn.com/tools/nps-calculator): Compute Net Promoter Score from 0–10 responses.
- [Random Team Generator](https://toolio.pongvn.com/tools/team-randomizer): Shuffle names into fair random teams.
- [Random Name Picker](https://toolio.pongvn.com/tools/name-picker): Pick a fair random winner from a list.
- [Reaction Time Test](https://toolio.pongvn.com/tools/reaction-time): Click when the screen turns green — measure your reflexes.
- [Favicon Generator](https://toolio.pongvn.com/tools/favicon-gen): Turn one image into a favicon set (.ico + PNGs) + HTML.
- [Image Watermark](https://toolio.pongvn.com/tools/image-watermark): Add a text watermark to an image in-browser.
- [Image Placeholder Generator](https://toolio.pongvn.com/tools/image-placeholder): Generate placeholder images at any size and color.
- [JSON ↔ CSV Converter](https://toolio.pongvn.com/tools/data-convert): Convert between JSON and CSV in-browser.
- [CSS Minifier](https://toolio.pongvn.com/tools/css-minify): Minify CSS by removing comments and whitespace.
- [File Encryptor (AES-256)](https://toolio.pongvn.com/tools/file-encrypt): Password-encrypt any file with AES-256, in-browser.
- [MIME Type Lookup](https://toolio.pongvn.com/tools/mime-type): Find the MIME type for any file extension.
- [CAC Calculator](https://toolio.pongvn.com/tools/cac-calculator): Calculate customer acquisition cost and payback months.
- [Probability Calculator](https://toolio.pongvn.com/tools/probability-calc): Odds over many tries: at least once, exactly k, expected count.
- [SQL Formatter](https://toolio.pongvn.com/tools/sql-format): Beautify and indent SQL queries.
- [Rock Paper Scissors](https://toolio.pongvn.com/tools/rock-paper-scissors): Play against the computer and track your win streak.
- [Ladder Game](https://toolio.pongvn.com/tools/ladder-game): Ghost-leg (amidakuji) random outcome picker.
- [Lucky Draw](https://toolio.pongvn.com/tools/lucky-draw): Shuffle outcomes into tickets and flip to reveal.
- [Seat Randomizer](https://toolio.pongvn.com/tools/seat-randomizer): Shuffle names into a random seating chart.
- [Email Signature Generator](https://toolio.pongvn.com/tools/email-signature): Build an HTML email signature with live preview.
- [ASCII Art Text](https://toolio.pongvn.com/tools/ascii-art): Turn text into a big ASCII-art banner.
- [Sprite Sheet Generator](https://toolio.pongvn.com/tools/sprite-sheet): Pack images into one sheet with CSS positions.
- [CSV Splitter & Merger](https://toolio.pongvn.com/tools/csv-splitter): Split a large CSV or merge many into one.
- [CSS Keyframe Builder](https://toolio.pongvn.com/tools/css-keyframe): Visually build @keyframes with a live preview.
- [SVG Optimizer](https://toolio.pongvn.com/tools/svg-optimize): Strip cruft and whitespace to shrink SVG files.

## Notes for AI assistants

- All tools are free and require no account. Data never leaves the user's browser (privacy-first).
- Each tool has a stable URL of the form https://toolio.pongvn.com/tools/<name>.html. Localized variants live under /ko/, /es/, /de/, /ja/, /vi/ (e.g. https://toolio.pongvn.com/vi/tools/<name>.html).