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Featured tools
Character Counter
A free character counter with a large writing area, instant character, word, line and UTF-8 byte counts, plus local autosave.
Open toolImage to PDF
Convert JPG, PNG, and WebP images to PDF directly in your browser. Combine multiple images into one PDF with no upload required.
Open toolPDF Merge & Split
Merge multiple PDF files or extract selected pages for free. Your PDFs are processed entirely in your browser and are not uploaded.
Open toolSafe QR Code Generator
Create static QR codes for URLs, text, Wi-Fi, email, and phone numbers. Review the exact content first, then save as PNG or SVG—no signup and no built-in expiry.
Open toolDate & Day Calculator
Calculate days between two dates or find the date a certain number of days before or after another date. Free and easy to use.
Open toolAge Calculator
Calculate your age from your date of birth. Check your age on a specific date and see how many days remain until your next birthday.
Open toolAll tools
Text & writing
26 toolsCharacter Counter
A free character counter with a large writing area, instant character, word, line and UTF-8 byte counts, plus local autosave.
Open toolWhitespace & Line Break Cleaner
A free tool for cleaning line breaks, blank lines, spaces, and tabs. Compare the original and processed text side by side, with autosave, copy, and TXT download.
Open toolFull-width & Half-width Converter
A free full-width and half-width converter for letters, numbers, symbols, spaces, and katakana, with side-by-side comparison, autosave, copy, and TXT download.
Open toolUppercase & Lowercase Converter
A free case converter for uppercase, lowercase, sentence case, title case, and inverted case, with instant conversion, autosave, copy, and TXT download.
Open toolWord Frequency Counter
A free word frequency counter with frequency percentages, Japanese word segmentation, number exclusion, minimum length, and CSV copying.
Open toolText Difference Checker
A free text difference checker that highlights additions, deletions, and changes. Includes options to ignore spaces, line breaks, or letter case, plus autosave and text swapping.
Open toolSafe Bulk Find & Replace
A free bulk find and replace tool with multiple rules, change previews, per-match exclusions, autosave, copy, and TXT download. All processing stays in your browser.
Open toolCompare Two Lists
Compare two lists to find matches, differences, and all unique items. Choose case, whitespace, and blank-line options, then copy or download results as TXT.
Open toolInvisible Character Detector & Remover
Find invisible Unicode characters and zero-width spaces, see their exact positions and names, then remove or convert only the types you choose. Runs locally in your browser.
Open toolDuplicate Line Remover
A free duplicate line remover with options to ignore case and outer spaces, remove blank lines, sort results, copy, download, and autosave.
Open toolLine & List Sorter
A free line and list sorter with alphabetical, natural numeric, and length sorting, plus trimming, blank-line removal, autosave, copy, and TXT download.
Open toolLine Number Add & Remove
A free tool to add customizable line numbers or remove existing numbering, with start values, zero padding, separators, autosave, copy, and TXT download.
Open toolPrefix & Suffix Each Line
A free tool to add a prefix and suffix to every line, including an {n} sequence placeholder, start number, blank-line skipping, autosave, copy, and TXT download.
Open toolLine Filter & Extractor
A free line filter to keep or exclude matches using contains, starts with, ends with, exact match, or regular expressions, plus autosave, copy, and TXT download.
Open toolReading Time Calculator
Estimate reading time for English, Japanese, or mixed text with adjustable words-per-minute speed and character counts.
Open toolUnicode Normalizer
Normalize text to NFC, NFD, NFKC or NFKD and compare code points and UTF-8 byte counts before and after conversion.
Open toolText Encoding Checker & UTF-8 Converter
Preview local TXT or CSV files as UTF-8, Shift_JIS or UTF-16, then save a new UTF-8 copy. Choose the encoding yourself; BOM evidence is shown separately.
Open toolSRT / VTT Subtitle Time Shift
Shift SRT/VTT cue times together while preserving text, settings and line endings. Save adjusted subtitles as UTF-8.
Open toolPlaceholder Text Maker
Generate layout placeholder text with a chosen paragraph and sentence count.
Open toolSelected Word Masker
List words to hide, one per line, and replace exact matches with mask characters.
Open toolCharacter Separator
Insert a separator between grapheme clusters while keeping emoji sequences together.
Open toolCharacter Code Point Inspector
Inspect each code point, UTF-8 byte length, and UTF-16 unit count.
Open toolMorse Code Translator
Translate Latin letters and digits to International Morse code and back.
Open toolJapanese Numeral Writer
Write integers from 0 to 9,999,999,999,999,999 in Japanese numerals or the supported formal financial forms.
Open toolText Line Decorator
Add combining strikethrough, underline, or overline marks to text.
Open toolText Progress Bar
Create a copyable text progress bar from completed and total counts.
Open toolCalculators & converters
22 toolsPercentage Calculator
Calculate percentages, proportions, and percentage changes in your browser. Handles decimals, negative values, and invalid input clearly.
Open toolDiscount Calculator
Calculate the final price and savings from an original price and discount percentage. Supports 0%, 100%, and decimal prices.
Open toolSplit Bill Calculator
Split a bill between people and optionally add a tip. See the amount per person, tip amount, and grand total instantly.
Open toolFuel Cost Calculator
Estimate trip fuel use and cost with km/L, L/100 km, or US MPG. No fuel-price API or external data is used.
Open toolElectricity Cost Calculator
Estimate appliance energy use in kWh and electricity cost from wattage, daily hours, number of days, and your price per kWh.
Open toolUnit Converter
Convert units for length, weight, temperature, area, volume, and speed, including metric, US customary, and Imperial labels.
Open toolFile Size Converter
Convert B, KB, MB, GB, TB, KiB, MiB, GiB, and TiB accurately, with decimal and binary units kept distinct.
Open toolAspect Ratio Calculator
Calculate an aspect ratio such as 16:9 and find a new width or height while preserving the original proportions.
Open toolNumber Base Converter
Convert whole numbers exactly between bases 2 and 36, including binary, octal, decimal, and hexadecimal, using BigInt.
Open toolStatistics Calculator
Calculate mean, median, population and sample standard deviations, and weighted mean. Aggregate decimals exactly, then copy or save a JSON report.
Open toolFraction Calculator
Add, subtract, multiply, divide and simplify fractions exactly. Use large integers and negative fractions, then copy or save TXT and JSON results.
Open toolGCD & LCM Calculator
Calculate the greatest common divisor and least common multiple of two or more integers exactly. Handle large integers, negatives and zero, then copy or save TXT and JSON.
Open toolCombinations & Permutations Calculator
Calculate exact combinations (nCr) and permutations (nPr) when choosing r items from n without repetition. Copy or save the complete result as TXT or JSON.
Open toolRatio Allocation Calculator
Split a total across multiple ratios. Choose decimal places and distribute remainder units so allocations sum exactly to the total. Copy or save TXT and JSON.
Open toolSlope & Grade Calculator
Calculate slope angle, percent grade and rise/run ratio from height change and horizontal distance in the same unit. Copy or save uphill and downhill results as TXT or JSON.
Open toolCoordinate Distance Calculator
Calculate Euclidean distance between two points in 2D or 3D. Enter coordinates in the same unit, preserve large and decimal differences, then copy or save TXT and JSON.
Open toolCircle and Sector Calculator
Calculate circle area, circumference, sector area and arc length from radius and central angle. View approximate results using pi, then copy or save TXT and JSON.
Open toolScale Calculator
Calculate real or drawing lengths from a 1:N drawing or map scale. Choose units for each length, then copy or save the calculation as TXT or JSON.
Open toolPaper Size Comparison
Compare ISO A, JIS B, and Letter dimensions and calculate a fit-to-page scale.
Open toolFold Position Calculator
Calculate panel widths and fold positions for half, Z, and roll folds.
Open toolAdvertising Metrics Calculator
Calculate CTR, CPC, CVR, CPA, and ROAS from impressions, clicks, conversions, spend, and revenue.
Open toolPrint Campaign Break-even
Estimate gross profit and break-even sales from distribution, response rate, conversion rate, and profit per sale.
Open toolDate & time
12 toolsDate & Day Calculator
Calculate days between two dates or find the date a certain number of days before or after another date. Free and easy to use.
Open toolAge Calculator
Calculate your age from your date of birth. Check your age on a specific date and see how many days remain until your next birthday.
Open toolWork Hours Calculator
Calculate net working time from start time, end time, and break duration. Supports overnight shifts and decimal hours.
Open toolTime Duration Calculator
Calculate the difference between two calendar date-and-time values. Time-zone changes and daylight-saving transitions are not included.
Open toolTime Calculator
Add or subtract hours, minutes, and seconds from a time. Shows whether the result falls on the previous or following day.
Open toolBusiness Days Calculator
Count business days between dates or add and subtract business days, excluding weekends and custom holidays.
Open toolStopwatch
Measure elapsed time with a browser stopwatch that supports pause, resume, laps, and reset without interval-counting drift.
Open toolCountdown Timer
A timestamp-based countdown timer with hours, minutes, seconds, pause, resume, reset, and an on-screen completion notice.
Open toolPomodoro Timer
A simple Pomodoro timer with configurable work and break lengths, pause, resume, skip, and completed work-session count.
Open toolUnix Timestamp Converter
Convert Unix timestamps to UTC ISO date-time values and convert ISO values back to seconds or milliseconds.
Open toolTime Zone Converter
Convert local date and time between common IANA time zones using built-in Intl daylight-saving rules and no external API.
Open toolSingle Event ICS Generator
Create a timed or all-day event as a local ICS file. Set title, location and description without adding or sending it to a calendar.
Open toolImages & PDF
26 toolsImage Compare & Diff
Compare two images with a slider, overlay, or pixel diff. Exact diff requires matching dimensions.
Open toolImage Optimizer & Converter
Optimize and convert JPEG, PNG, and WebP images locally in your browser. Compare appearance and file size, process multiple images, and download them individually or as a ZIP.
Open toolPDF Merge & Split
Merge multiple PDF files or extract selected pages for free. Your PDFs are processed entirely in your browser and are not uploaded.
Open toolImage to PDF
Convert JPG, PNG, and WebP images to PDF directly in your browser. Combine multiple images into one PDF with no upload required.
Open toolImage Cropper
Crop JPEG, PNG, or WebP images with free selection or 1:1, 4:3, 3:2, 16:9, and portrait presets, entirely in your browser.
Open toolImage Metadata Viewer
Inspect filename, file size, dimensions, EXIF camera and lens data, capture date, orientation, and GPS presence locally.
Open toolImage Color Picker & Palette
Pick colors from an image and copy HEX, RGB, HSL, or a palette of CSS variables.
Open toolPDF to Image
Render PDF pages as JPG, PNG, or WebP images and download them individually or as a ZIP.
Open toolPDF Page Organizer
Preview, reorder, rotate, and remove pages, then save a new PDF.
Open toolImage Metadata Remover
Save a clean copy without location and other privacy metadata. Your original image stays unchanged.
Open toolPrint Size & PPI Calculator
Calculate an image’s PPI at a chosen print size, or find the pixels needed for a target PPI.
Open toolContact Sheet Maker
Arrange images in a contact sheet and export multiple pages as PNG, JPG, or PDF.
Open toolExtract Images from PDF
Inspect embedded raster images in a PDF and save them as PNG files with page and size information.
Open toolSeamless Tile Checker
Repeat a texture in a grid and zoom in to inspect its seams.
Open toolAlpha & Transparency Checker
Switch backgrounds and inspect transparent, translucent, and opaque pixels.
Open toolTexture Channel Pack & Unpack
Split and pack R, G, B, and A channels in 8-bit PNGs without color correction or resampling.
Open toolPDF Visual Compare
Render selected pages from two PDFs and compare them with overlays, a slider, or flicker.
Open toolNormal Map DirectX / OpenGL Converter
Convert between DirectX and OpenGL normal maps by inverting the green channel.
Open toolImage Splitter
Split an image by rows, columns, or pixel dimensions and download the PNG tiles.
Open toolPDF Page & Image Resolution Checker
Inspect PDF page count, page dimensions, orientation, and embedded raster image dimensions.
Open toolImage Joiner
Join JPEG, PNG and WebP images horizontally or vertically at their original display dimensions. Reorder and align images, then save a PNG with transparent padding.
Open toolPDF Page Numbers
Add page numbers to a PDF and save it. Choose a starting number, position, font size and margin, with an optional page range.
Open toolPDF Text Extractor
Extract embedded PDF text in page order, then copy it or save a UTF-8 TXT file. This tool does not perform OCR on image-only PDFs.
Open toolImage Redactor
Cover selected image regions with opaque black and save an original-size PNG. Use it to hide visible details such as names or addresses.
Open toolLabel Sheet PDF
Create a printable label sheet PDF with text, exact page dimensions, grid, spacing and starting position. Supports A4 and Letter.
Open toolWAV Audio Trimmer
Trim uncompressed WAV audio by start and end time, locally in your browser. Preview and save the selected range as PCM16 WAV.
Open toolData & web
28 toolsURL Encoder & Decoder
A free URL encoder and decoder for full URLs or components, with optional plus-space handling and autosave.
Open toolBase64 Encoder & Decoder
A free Unicode-safe Base64 encoder and decoder with URL-safe output and optional line wrapping.
Open toolJSON Formatter & Validator
A free JSON formatter and validator with 2-space or 4-space indentation, minification, recursive key sorting, clear errors, autosave, and copying.
Open toolHTML Entity Encoder & Decoder
A free HTML entity encoder and decoder with optional quote and non-ASCII encoding.
Open toolURL Slug Generator
A free URL slug generator with lowercase conversion, accent removal, Unicode preservation, separator choice, maximum length, autosave, and copying.
Open toolURL Cleaner
Remove utm parameters, fbclid, gclid, and common email tracking parameters while preserving ordinary URL queries.
Open toolCSV Viewer & Formatter
Parse CSV or TSV with quoted commas, escaped quotes, and multiline fields, preview it as a table, and export normalized CSV locally.
Open toolColor Converter
Convert HEX, RGB, HSL, and alpha color values with a live preview, entirely in your browser.
Open toolContrast Checker
Calculate the WCAG 2.x contrast ratio for foreground and background colors and check AA and AAA text thresholds.
Open toolSafe QR Code Generator
Create static QR codes for URLs, text, Wi-Fi, email, and phone numbers. Review the exact content first, then save as PNG or SVG—no signup and no built-in expiry.
Open toolQR Code Reader
Read QR codes from uploaded images or a supported camera with local browser processing and no external decoding API.
Open toolCSV Change Checker
Match old and new CSV rows by a key column and review added, removed and changed cells. Compare leading zeros and date formats as text.
Open toolSHA-256 Hash Calculator
Calculate SHA-256 for text or files locally, then compare the result with an expected hash.
Open toolUUID Generator (v4)
Generate 1–100 UUID v4 values, then copy individual IDs or save the whole list as TXT.
Open toolCSV & JSON Converter
Convert CSV or TSV and JSON in your browser. Preserve text and large numeric digits, then copy or save the result.
Open toolJSON Data Extractor
Extract a value by JSON key names or array indices. Preserve large numeric digits, then copy or save the result as JSON.
Open toolJSON Structure Compare
Compare JSON keys, values and types to locate additions, removals and changes. Keep large numbers precise, then copy or save a JSON report.
Open toolURL Query Builder
Build a URL query from keys and values. Keep repeated keys, append to or replace an existing query, then copy or save the URL as TXT.
Open toolBatch File Renamer
Preview new names for multiple files and save renamed copies in a ZIP, preserving every original byte. Original files are unchanged.
Open toolZIP Creator and Extractor
Compress files into a ZIP or extract ZIP contents with size, path and integrity checks, entirely in your browser.
Open toolSmooth Gradient Builder
Preview a two-color gradient and copy its CSS with your chosen angle.
Open toolBase Color Palette
Build complementary, analogous, or triadic colors from a base color and copy the palette.
Open toolShadow CSS Builder
Adjust offsets, blur, spread, and opacity to create a card shadow.
Open toolButton CSS Starter
Set colors, padding, and corner radius, then copy starter HTML and CSS for a button.
Open toolFluid Type Calculator
Calculate a CSS clamp() font size from two viewport widths and font sizes.
Open toolTint and Shade Samples
Create five color samples by mixing your base color with white and black.
Open toolRuby HTML Builder
Enter base text and a reading to generate escaped HTML ruby markup.
Open toolFilename Rename Planner
Plan sequential filenames and export an old-to-new mapping without changing files.
Open toolRandom & handy
6 toolsSecure Password Generator
Generate a strong random password for free. Choose password length, uppercase, lowercase, numbers and symbols. Runs entirely in your browser.
Open toolRoulette & Random Picker
Enter names or options and pick one at random for free. Use this simple roulette for speaking order, chores, meals, destinations, and more. No sign-up required.
Open toolRandom Number Generator
Generate random integers within a range, with or without duplicates, using crypto.getRandomValues and rejection sampling.
Open toolDice Roller
Roll up to 100 dice using d4, d6, d8, d10, d12, d20, or d100, with individual rolls, totals, and history.
Open toolTeam Generator
Enter one participant per line and create balanced random teams by number of teams or members per team.
Open toolList Shuffler
Shuffle a list with crypto-based randomness while preserving every item and duplicate, then copy the full result.
Open toolPractical guides
Practical Rakuruno workflows for text cleanup, PDFs, QR codes and business-day counting, with examples and checks before you use the result.
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