Online tools

Place each revealed candidate in ranks 1–5. Once placed, a candidate cannot move.

Find a percentage of a number, a part-to-whole ratio or a percentage change.

Check that your microphone works, read its level in dBFS and hear a 5 second recording.

Make JPEG, PNG, WebP and HEIC images smaller right in your browser.

Measure your typing speed and accuracy in English or Korean.

Measure how fast you react to a visual signal over 5 rounds.

Add text or images, assign tiers, then save your ranking as a PNG.

Create a 3×3, 4×4 or 5×5 card, mark matching squares and share the result.

Spin a wheel, draw names without repeats or divide a list into random teams.

Add top and bottom captions or a clean caption panel to your own image.

Build a head-to-head tournament from your own list and play through to a winner.

Answer eight travel questions to get a result card based on your choices.

Play original question decks or write your own pairs for friends and gatherings.

Take four photos with your camera or arrange your own photos into a strip.

Turn books, songs, foods or memories into a typographic receipt.

Organize a topic into five levels of knowledge and export your chart.

Draw a circle or a straight line in one stroke and compare your own attempts.

Create pixelated, grayscale or ordered-dither art from your own image.

Combine images or a short video segment into a looping GIF.

Create QR codes for text, links, Wi-Fi and contact details, with PNG and SVG export.

Count Unicode characters and UTF-8 bytes, remove duplicate lines and tidy whitespace.

Build a knockout bracket for 2 to 32 players and record winners round by round.

Estimate five angles and compare each answer with the actual angle.

Calculate two successive discounts, savings and a final total including shipping.

Preview your camera, check its real resolution and frame rate, and save a snapshot.

Convert images between JPG, PNG and WebP, including HEIC photos.

A focus timer with short and long breaks, a task label and a daily session count.

Stop a hidden stopwatch at exactly 5, 10 or 30 seconds.

Create 2–12 shuffled bingo cards from one prompt list.

Roll d4, d6, d8, d10, d12, d20 or d100 dice and see their sum.

Place two images side by side with editable labels.

Split a bill and optional tip fairly in whole currency units or cents, with an exact total.

Create a word-search grid from your own words and export a puzzle or solution image.

Turn an image into a plain-text drawing with adjustable width and brightness.

Turn up to 50 text lines into individual QR code PNGs and download a ZIP bundle.

Validate JSON and switch between readable indentation and compact output.

Make a schedule where every pair of 2–20 players meets once.

Estimate the coloured bar length as a percentage of the reference line.

Convert length, mass, area, volume, speed and temperature using explicit units.

Press every key to see it light up, read its key code and check for dead keys or ghosting.

Change image dimensions by pixels or percentage, for one image or many.

Mix rain, waves, wind, fire, a fan and colored noise into your own background sound.

Spot the one tile with a slightly different shade as the grid grows.

Flip one or many virtual coins and count heads and tails.

Arrange your own words and attribution on a light or dark card and save a PNG.

Generate a random maze with a connected route and download the puzzle or its solution.

Compare two HEX colors and check WCAG AA and AAA text contrast thresholds.

Compare up to 200 lines per side and highlight added and removed lines.

Adjust red, green and blue to match a hidden target colour.

Reduce an integer ratio and find a proportional value for a new first term.

Fill the screen with solid colors to find dead, stuck and hot pixels.

Turn iPhone HEIC photos into JPG files that open everywhere.

Follow an animated circle for box breathing, 4-7-8 or coherent breathing.

Remember a number that grows by one digit every round.

Draw integers within inclusive bounds, optionally without repeats.

Preview a linear or radial gradient and copy a CSS background declaration.

Encode UTF-8 text as Base64 or decode Base64 back into text.

Choose items from a fixed list and spend a fictional ten-billion-won budget.

Find count, sum, average, median, minimum, maximum and population standard deviation.

Tune any instrument with your microphone, with presets for guitar, bass and ukulele.

Combine JPG, PNG and other images into one PDF, one image per page.

Measure elapsed time, pause and resume, and export lap records as CSV.

Hit 30 targets as fast and as accurately as you can.

Preview a box shadow and copy CSS with offsets, blur, spread, colour and opacity.

Encode or decode a URL parameter using percent encoding.

Edit a phrase to satisfy ten rules that are revealed one at a time.

Add, subtract, multiply or divide fractions and return an exact reduced fraction.

Keep steady time from 20 to 300 BPM with accents, subdivisions and tap tempo.

Combine several PDF files into one, in the order you choose.

Set a duration from one second to 24 hours and count down with pause and resume.

Count clicks over 5, 10 or 15 seconds and calculate clicks per second.

Adjust the four corner radii separately and copy the resulting CSS.

Calculate SHA-256, SHA-384 or SHA-512 for UTF-8 text.

Find four distinct hidden digits using strike and ball clues.

Evaluate arithmetic, powers, roots, logarithms and trigonometry with degrees or radians.

Check left, middle, right, double-click and wheel events in one pad.

Extract page ranges into a new PDF, or split every page into its own file.

Alternate work and rest periods for a chosen number of rounds.

Watch a growing tile sequence and repeat it in order.

Generate a fluid CSS clamp value between two sizes at chosen viewport widths.

Generate a password using browser cryptographic randomness and chosen character groups.

Play the Monty Hall game and compare keeping or switching your choice.

Calculate completed years and total elapsed days between a birth date and reference date.

Play a short test tone through the left, right or both channels.

Crop an exact rectangle using percentage controls, then save a PNG.

Estimate reading time with separate word and Korean/CJK character speeds.

Remember highlighted squares on a 4×4 board and find them after they disappear.

Convert HEX, comma-separated RGB and HSL colours, including alpha transparency.

Convert CSV with quoted fields into JSON objects, or a JSON object array into CSV.

Convert distance and duration to pace per kilometre, per mile, speed and a same-pace marathon time.

Read your browser viewport, screen dimensions, pixel ratio and current orientation.

Rotate a photo by 90, 180 or 270 degrees and mirror it horizontally or vertically.

Compare current local times across selected cities, including their UTC offsets.

Play a local two-player game of tic tac toe, undo moves and save the board as an image.

Escape HTML-sensitive characters or decode entity references into text.

Scale every ingredient quantity when changing the number of servings.

Check whether browser APIs for media, storage, canvas and file handling are available.

Add a text watermark with adjustable position, size and opacity.

Count calendar days between two dates, optionally including both the start and end date.

Drop pieces into a seven-column board and connect four marks with another player on the same device.

Inspect code points and UTF-8 bytes, including combining marks and emoji.

Convert bits, bytes, decimal kB–TB and binary KiB–TiB without mixing their scales.

Cover a selected rectangle with solid black pixels before sharing a screenshot.

Find the ISO week year, week number and Monday-to-Sunday range for a date.

Generate up to 50 random UUID v4 identifiers and copy or save the list.

Add time durations or subtract two durations and convert the result to seconds and decimal hours.

Arrange up to 20 images in a labeled thumbnail sheet.

Track days, hours, minutes and seconds until a date in your device’s local timezone.

Convert Unix seconds or milliseconds to ISO time, or convert an ISO date back to Unix.

Encode an image as a data URL for embedding or save the encoded text locally.

Convert signed integers between binary, octal, decimal and hexadecimal without precision loss.

Rasterize an SVG image into a PNG with a chosen width and preserved aspect ratio.

Read a JWT header and payload locally without claiming to verify its signature.

Extract common opaque colors from an image and export their HEX values as CSS variables.

Test a JavaScript regular expression and inspect match text, positions and capture groups.

Create favicon.ico, PNG icons and a starter web manifest in one ZIP file.

Generate Latin-style placeholder paragraphs with a chosen paragraph and word count.

Add a solid-color border around an image and export a new PNG.

Convert a phrase or identifier to camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.

Round an image’s corners and save a PNG with transparent corner areas.

Count repeated words with optional case folding and show the 200 most frequent terms.

Split an image into numbered PNG tiles and download the complete grid as a ZIP.

Infer a TypeScript type from a JSON example, including nested objects, arrays and null values.

Rotate all or selected PDF pages by 90, 180 or 270 degrees in your browser.

Format valid XML with readable indentation while preserving mixed text content.

Save a PDF with all pages in the order you specify.

Turn spreadsheet cells copied as tab-separated rows into a Markdown table.

Remove selected pages from a PDF and download a new copy.

Compare JSON values while ignoring object key order and preserving array order.

Add page numbers to the bottom left, centre or right of every PDF page.

Read a specific JSON value with a slash-separated JSON Pointer, including array indexes.

Read and edit the title, author, subject and keyword fields stored in a PDF.

Separate a web URL into protocol, host, port, path, repeated query values and fragment.

Inspect each PDF page size in millimetres and export a CSV report.

Build campaign URLs with source, medium, campaign, term and content parameters.

Create readable hyphenated URL slugs, with Unicode or ASCII-only output.

Sort lines naturally, reverse the order and optionally remove exact duplicates.

Find shared items, A-only items, a union or a symmetric difference of two lists.