Tools
Audio
- Audio SeparatorSplit a song into vocals, drums, bass and other parts.
- Silence CutterFind the silent stretches in a recording and close them up.
- Audio ConverterConvert audio between MP3, WAV, M4A and more.
- BPM DetectorDetect a track's BPM by analyzing a file, or tap it out by hand.
- Audio MasteringAdjust a mix to streaming loudness and export it.
- Key & Tempo ChangerChange key and tempo independently.
- Audio CutterCut the part you need out of an audio file, or join several into one.
- Key & BPM analysisAnalyze a track’s key, BPM and quality.
- Voice recorderRecord from your microphone, play it back, save as WAV or MP3.
- Tuner & metronomeMeasure pitch from the microphone in cents, with a metronome on the same page.
- Volume & level matchRaise or lower audio by dB, or match peak or loudness across several files.
Images
- Image CompressorCompress images and video for their destination.
- Image ConverterConvert images between HEIC, PNG, JPG, WebP and more.
- Background RemoverPick a color and export a transparent PNG with that background removed.
- Image ResizerResize images to an exact dimension, aspect ratio kept, in your browser.
- QR code generatorBuild QR codes for links, Wi-Fi and contacts, then save PNG or SVG.
- Image metadata removerView and remove the capture date, camera and GPS data embedded in a photo.
- Colour converter & contrastConvert between HEX, RGB and HSL, and check the contrast of two colours.
Files
- File ConverterConvert images, audio and video to other formats.
- ZIP ExtractorOpen a ZIP file and save its contents individually or all at once.
- Video CompressorCompress a video to fit a target size.
- Device-to-device transferSend files straight to another device on your Wi-Fi. No upload, no expiry.
- Cast screenShow this computer's screen on another device's browser. No app to install.
- BenchKeep files on this device and reach them from any tool.
Text & Data
- JSON FormatterPretty-print, minify, sort keys — and point at the exact line that broke.
- CSV ConverterCSV and JSON, both ways — quoted commas and line breaks included.
- Text FormatterClean up letter case, extra whitespace, repeated blank lines, and line endings.
- Word CounterCharacters, words, lines and reading time, counted as you type.
- Base64 encode & decodeText and files to Base64 and back, data URLs included.
- Text diffCompare two texts and see which lines changed — and what changed inside them.
- Full-width / half-width converterConvert Japanese text between full-width and half-width, one character class at a time.
- Line toolsRemove duplicate and blank lines, sort, trim and number a list — in one pass.
- Unix time converterEpoch seconds and milliseconds to dates and back, local and UTC together.
- Regex testerTest a pattern against text: highlights, capture groups and a replace preview.
- UUID generatorGenerate UUID v4 (random) and v7 (time-ordered) in bulk.
- JWT decoderRead the contents of a JWT and check its expiry. Signature not verified.
- URL encoder / decoderPercent-encode text for URLs and decode %XX back to readable characters.
- Vertical text (tategaki)Lay Japanese text out vertically: on screen, as pasteable text, or as a PNG.
- Mojibake decoderRecover the original Japanese from garbled text like 譁�蟄怜喧縺� or 日本語.
Document
Network
Calculation
- Date calculatorThe span between two dates, and the date N days before or after one.
- Sales tax & discount calculatorConvert between tax-inclusive and tax-exclusive prices, with discounts.
- Bill splitterSplit a total between people, with rounding and an organiser tilt.
- Japanese era converterConvert between Western years and Japanese eras (Meiji to Reiwa), with zodiac and age.
- Age calculatorExact age, days lived, traditional Japanese count and days to the next birthday.
- Weekday finderThe weekday of any date, days from today, day of year and ISO week number.
- Percentage calculatorB% of A, A as a percent of B, percent change and percent off, each with the formula.
- Wage calculatorMonthly and yearly income from an hourly wage, salary to hourly, and overtime pay.
- Unit converterLength, mass, area, volume, temperature, speed and data, all units at once.
Other
- Falling blocksRotate and stack seven shapes, clear full rows. Scores stay on your device.
- Block puzzlePlace three shapes on an 8x8 board and clear full rows and columns. No timer.
- Merge the numbersSlide a 4x4 board and add equal numbers together. Reach 2048.
- MinesweeperUse the numbers to avoid the mines. The first click is always safe.
- SudokuFill a 9x9 grid with 1-9. Every puzzle has exactly one solution.
- Chain puzzleDrop pairs of coloured beads, link four of a colour, and watch the gaps fall into the next clear.
- Match threeSwap neighbours to line up three of a mark. Thirty moves, no clock.
- Tile matchClear 84 stacked tiles two at a time. Every deal is guaranteed solvable.
- Sliding puzzleSlide the tiles back into order. Every shuffle is solvable. 3x3 up to 5x5.
- Password generatorStrong passwords and passphrases, made entirely in your browser.
- Hash & checksumCompute SHA-256, MD5 and more for text or files, and compare against a published value.
- Weather forecastJapan Meteorological Agency forecasts, today through the week.
- Recent earthquakesJMA earthquake reports, updating automatically, with intensity by prefecture.
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