Calculator
Evaluate expressions, track history, and handle quick arithmetic without leaving the page.
- Expression input
- Recent history
- Copy result
Fast client-side utilities for text, numbers, dates, images, PDFs, and developer workflows. Everything runs in your browser.
Routes, navigation, RSS, and sitemap are generated from a single tool registry.
33 browser utilities, ready for more.
Evaluate expressions, track history, and handle quick arithmetic without leaving the page.
Convert between common length, weight, area, volume, speed, and temperature units.
Convert major currencies using a local offline rate snapshot you can edit and store in the browser.
Compare dates, count days, and add or subtract precise offsets from a base date.
Compare two time zones and preview meeting times across major cities.
Convert Unix timestamps into local or UTC time and turn readable dates back into seconds or milliseconds.
Build, validate, and explain 5-field cron expressions with upcoming run previews.
Create QR codes locally with custom size, colors, margin, and downloadable SVG or PNG output.
Generate multiple strong passwords with configurable character sets and instant strength hints.
Decode JWT header and payload locally, inspect common claims, and preview token timing without verification.
Generate single or batched UUID v4 values and copy them in the format you need.
Hash text or files locally with standard SHA algorithms and compare against an expected digest.
Test regular expressions against sample text with flags, group capture details, and replace previews.
Validate, format, minify, and recursively sort JSON while tracking payload stats.
Format SQL locally, switch keyword casing, preview structure, and inspect query metadata without sending queries anywhere.
Convert CSV or TSV rows into JSON objects locally with header-based keys and copy-ready output.
Compare two text blocks line by line, spot additions or removals, and copy the filtered output you need.
Encode or decode UTF-8 text and files, with optional URL-safe output and data URL support.
Encode, decode, and inspect URL query parameters without sending data anywhere.
Split pasted values, clean and deduplicate them, then export lines, CSV, JSON arrays, or SQL IN lists locally.
Transform text into common writing and developer naming styles with one click.
Build Markdown tables visually, paste CSV or TSV, and import JSON rows without leaving the browser.
Generate placeholder paragraphs, sentences, or words locally for mockups, docs, and content drafts.
Count words, lines, characters, reading time, and repeated keywords as you type.
Calculate BMI in metric or imperial units and view healthy weight guidance for the same height.
Handle percentage-of, ratio, and percent-change calculations from one page.
Convert HEX, RGB, and HSL values instantly with a live preview and copy-ready output.
Resize images locally with aspect-ratio controls, format selection, quality tuning, and download output.
Convert images between PNG, JPEG, and WebP locally with optional resizing and quality controls.
Check dead pixels, stuck pixels, backlight bleed, gradients, uniformity, sharpness, and color patterns in fullscreen.
Run a local moving target test for monitor response speed, ghosting, blur, and inverse ghosting checks.
Combine multiple PDF files in the browser, reorder them, and download one merged document.
Extract selected page ranges from a PDF into a new document without uploading the file.