Precision stopwatch with start, stop, lap recording, and reset functionality. Lap times are displayed in a table for easy comparison.
Configurable countdown timer with hours, minutes, and seconds input. Features start, pause, and reset controls with visual progress bar.
Calculate total work hours between start and end times with a configurable break. Essential for timesheets and payroll.
Bidirectional YAML to JSON and JSON to YAML conversion with auto-format detection and real-time preview. Perfect for configuration files, API payloads, and data migration.
Expression evaluator with keypad and history, ETA calculator with distance and speed, and a stopwatch/chronometer with lap recording.
Computes percentage values, percentage increases and decreases, and what-percent-of-what relationships with precise decimal arithmetic. Essential for everyday math — tips, discounts, tax rates, grade scores, and statistical comparisons where quick percentage answers are needed.
Stopwatch lets you precision stopwatch with start, stop, lap recording, and reset functionality. Lap times are displayed in a table for easy comparison.. Everything runs inside your browser — nothing is uploaded to a server. It works on any device with a modern web browser.
Precision stopwatch with start, stop, lap recording, and reset functionality. Lap times are displayed in a table for easy comparison. It's ideal for developers, designers, and anyone who needs to precision stopwatch with start, stop, lap recording, and reset functionality without installing software or sending data to external servers.
Direct text entry, file upload, or URL-based input — depending on the tool. Paste or type your content directly into the provided editor area.
Yes. After the initial page load, Stopwatch runs entirely on your device with no internet connection needed. All processing is done locally.
Tools cover JavaScript, CSS, HTML, SQL, Python, JSON, XML, CSV, and more. Check individual tool descriptions for specifics.
No. All code processing — formatting, minification, conversion, hashing — runs locally in your browser.
Yes. Since processing is local, performance depends on your device. Most operations handle large files without issue.
Yes. SQL uses sql-formatter, JSON uses native JSON.parse, and other formatters follow widely adopted formatting rules.
Yes. All developer tools work fully offline after the initial page load.
Time Converter
Convert between time units including seconds, minutes, hours, days, weeks, months, and years with precise decimal results.
Diff Checker
Compares two input texts side-by-side, highlighting inserted, deleted, and changed lines with distinct background colors.
Regex Tester
Provides an interactive environment where users can write a regular expression pattern, test it against sample strings, and view real-time match.
JSON Formatter
Pretty-prints raw JSON with configurable indent width, key sorting, and bracket collapsing options while flagging syntax errors with exact.
JS Minifier
Strips comments, whitespace, and shortens local variable names in JavaScript source without altering execution semantics.
Base64 Encode/Decode
Encodes text or small files into Base64 strings and decodes them back with automatic MIME-type detection for binary safety.