Kits
step-by-step workflowsQuickly check duration/bitrate and prep audio or video before sending it to clients or editors.
Detect the delimiter, find broken rows, and sanity-check CSV structure without uploading anything.
Parse campaign URLs, label parameters by platform, and export a neat CSV for QA and reporting.
Make links look natural and privacy-friendly by removing tracking parameters before sharing.
Pick a timer based on your workflow: focus blocks, intervals, EMOM/AMRAP, or fixed HIIT sessions.
Tune by pitch, find tempo by tapping, and practice with a clean click track.
Timers & Workout
Minimal timers for focus and training.
Simple Hourglass
Just an hourglass. 3, 5, 15, 30, 60 min.
Pomodoro Timer
25 min work / 5 min break productivity timer.
EMOM Timer
Every Minute On the Minute timer with beep cues each minute for conditioning rounds.
AMRAP Timer
As Many Rounds As Possible timer with countdown and finish beep. Set minutes 1-90.
Interval Timer
Simple Work/Rest loop. No rounds limit.
Simple Tabata Timer
4-minute Tabata workout (20s/10s). No setup.
Simple HIIT Timer
10-minute HIIT workout (30s/30s). No setup.
Date Calculators
Quickly calculate dates and times.
Everyday Calculators
Quick converters for daily life.
PDF & Document Tools
Manipulate documents in your browser.
Media Tools
Process audio and video files locally.
Image Responsive Preview
Preview how one image scales on smartphone and tablet viewports.
Image + Audio to Video
Create a video from an image and audio file (max 5 min).
Media Duration Analyzer
Check audio & video length instantly. No upload.
Media Bitrate Checker
Check codec, bitrate, sample rate, resolution, and FPS locally.
Audio Trim (Simple Cut)
Cut audio locally. No upload. No effects.
Video to Audio Extractor
Extract audio from video locally. No upload.
Mosaic Image Tool
Apply uniform mosaic/pixelation to images. Batch process up to 10 files.
AI Image Detector (AI画像フォレンジック分析)
Upload an image to analyze forensic clues and detect AI generation. All in-browser.
Music Tools
Simple tools for musicians and audio.
Text & Data Utilities
Clean, inspect, and transform text and data.
Remove ChatGPT UTM
Remove utm_source=chatgpt.com and other AI tracking params.
File Size Unit Converter
Convert file sizes between KB, MB, GB, and more instantly.
AI Text Cleaner
Clean up AI output for Slack, Teams, and email.
Revision Review
Accept or reject edits to finalize a revised document.
Text Diff
Compare two texts with line/word/char diff modes. Side-by-side or unified view.
Base64 Tool
Encode text or files to Base64, or decode Base64 back to text.
URL Parameter Cleaner
Remove tracking parameters from shared links.
Ad URL to CSV Parser
Extract tracking parameters from ad URLs to CSV.
Markdown Table to Image
Convert Markdown tables into PNG/JPG images or CSV for spreadsheets. Preview before download.
Markdown to PDF
Export Markdown with footnotes, themes, and fonts from a local live preview.
SVG Preview & Download
Preview SVG and download it instantly as SVG, PNG, or JPG.
CSV Column Count
Count rows and columns in CSV data instantly.
CSV Delimiter Detector
Detect the delimiter (comma, tab, semicolon, pipe) in CSV data.
CSV to ICS Converter
Convert schedule CSV files into calendar .ics files with validation.
CSV/TSV Batch Converter
Batch-convert CSV/TSV with delimiter/newline/BOM presets and ZIP output.
SQLite Viewer (Local)
Open a local SQLite DB, run SELECT queries, and export CSV/JSON.
Broken CSV Checker
Find rows with incorrect column counts.
JSON Shape Inspector
Validate JSON syntax and inspect structure details.
OpenCode DeepSeek Flash
Generate OpenCode config and CLI commands for DeepSeek V4 Flash.
Financial Calculators
Investment and retirement planning calculators.
Compound Interest Calculator (複利計算)
Calculate future value with monthly contributions and compound interest.
Rule of 72 Calculator (72の法則)
Estimate years to double your money or rate needed. Quick mental math.
Investment Growth Calculator (投資リターン計算)
Project nominal and inflation-adjusted real returns side by side.
DCA vs Lump Sum (積立vs一括)
Compare dollar-cost averaging vs lump sum investing. See which wins.
Withdrawal Simulator (資産取崩しシミュレーション)
Monte Carlo simulation of retirement withdrawals. See success rate.
Loan Calculator (ローン計算)
Calculate monthly payments, total interest, and amortization schedule.
Savings Goal Calculator (貯蓄目標計算)
See how many years to reach your savings target with regular contributions.
Discount Calculator (割引計算)
Calculate sale price and savings from any percentage discount instantly.
Debt Payoff Strategy (借金返済戦略)
Compare snowball vs avalanche debt payoff strategies. See total interest and payoff time.
Emergency Fund Runway (緊急資金計算)
See how many months your savings would last if you lost your income.
Japanese Calendar / 暦ツール
Auspicious day calendar based on traditional Japanese almanac.
Japanese Text Tools / 日本語テキスト
Small utilities for cleaning Japanese text.
Text Cleaner (改行・空白・タブ削除)
Remove newlines/spaces/tabs and view diffs (browser-only).
Login-Free Tategaki Editor (ログイン不要縦書きエディタ)
SaaS風トップからエディタ本体へ。縦書きプレビュー付きで、入力をブラウザ内に自動保存できます。
Daily Report Time Calculator (日報用 時間計算)
作業と移動時間を合計して、終了時刻（順算）や必要な開始時刻（逆算）を計算します。
D'Hondt Calculator (ドント方式)
ドント方式・Sainte-Lague法・Hare余り方式の議席配分を並列比較できます。
Lean Canvas Planner (リーンキャンバス作成ツール)
9ブロックで事業計画を整理し、ブラウザ保存・JSON保存ができます。
UTM & Marketing / マーケティングツール
UTM parameter tools and QR code generator in Japanese.