One place for privacy-first browser tools.

Calculator

Evaluate expressions, track history, and handle quick arithmetic without leaving the page.

Expression input
Recent history
Copy result

Unit Converter

Convert between common length, weight, area, volume, speed, and temperature units.

Six categories
Swap units
Formula hint

Currency Converter

Convert major currencies using a local offline rate snapshot you can edit and store in the browser.

Offline rates
Editable snapshot
Reverse rate

Time

Date Calculator

Compare dates, count days, and add or subtract precise offsets from a base date.

Date difference
Offset planner
Weekday count

Time

Timezone Converter

Compare two time zones and preview meeting times across major cities.

Zone conversion
World clock
Browser local time

Time

Timestamp Converter

Convert Unix timestamps into local or UTC time and turn readable dates back into seconds or milliseconds.

Auto detect units
UTC and local output
Now shortcut

Cron Expression Builder

Build, validate, and explain 5-field cron expressions with upcoming run previews.

5-field validation
Upcoming run preview
Preset schedules

QR Generator

Create QR codes locally with custom size, colors, margin, and downloadable SVG or PNG output.

SVG export
PNG export
Color controls

Security

Password Generator

Generate multiple strong passwords with configurable character sets and instant strength hints.

Crypto RNG
Batch suggestions
Entropy estimate

Security

JWT Decoder

Decode JWT header and payload locally, inspect common claims, and preview token timing without verification.

Header and payload decode
Claim timing preview
Bearer token cleanup

UUID Generator

Generate single or batched UUID v4 values and copy them in the format you need.

Batch generation
Uppercase option
Hyphen toggle

Hash Generator

Hash text or files locally with standard SHA algorithms and compare against an expected digest.

Text and file input
Digest compare
Multiple SHA variants

Regex Tester

Test regular expressions against sample text with flags, group capture details, and replace previews.

Live test run
Group capture table
Replace preview

JSON Formatter

Validate, format, minify, and recursively sort JSON while tracking payload stats.

Pretty print
Minify
Sort keys

SQL Formatter

Format SQL locally, switch keyword casing, preview structure, and inspect query metadata without sending queries anywhere.

Multi-statement formatting
Keyword and identifier casing
Statement and table insights

CSV to JSON

Convert CSV or TSV rows into JSON objects locally with header-based keys and copy-ready output.

CSV or TSV input
Header-based objects
Pretty or minified export

Text Diff Checker

Compare two text blocks line by line, spot additions or removals, and copy the filtered output you need.

Line-by-line compare
Change counters
Copy filtered output

Base64

Encode or decode UTF-8 text and files, with optional URL-safe output and data URL support.

UTF-8 safe
File encode
URL-safe mode

URL Encoder

Encode, decode, and inspect URL query parameters without sending data anywhere.

Encode/decode
Parameter parser
Query preview

Delimiter Studio

Split pasted values, clean and deduplicate them, then export lines, CSV, JSON arrays, or SQL IN lists locally.

Auto delimiter detection
Deduplicate and sort
SQL and JSON export

Text Case Converter

Transform text into common writing and developer naming styles with one click.

Prose styles
Dev naming styles
Copy any result

Markdown Table Generator

Build Markdown tables visually, paste CSV or TSV, and import JSON rows without leaving the browser.

Visual editor
CSV or TSV paste
JSON rows import

Lorem Ipsum Generator

Generate placeholder paragraphs, sentences, or words locally for mockups, docs, and content drafts.

Paragraph, sentence, or word mode
Classic opening toggle
Copy or TXT download

Word Counter

Count words, lines, characters, reading time, and repeated keywords as you type.

Live stats
Reading time
Top keywords

Health

BMI Calculator

Calculate BMI in metric or imperial units and view healthy weight guidance for the same height.

Metric and imperial
Range label
Healthy span

Percentage Calculator

Handle percentage-of, ratio, and percent-change calculations from one page.

Three modes
Percent change
Quick answers

Color Converter

Convert HEX, RGB, and HSL values instantly with a live preview and copy-ready output.

HEX RGB HSL
Live preview
Quick palette

Image Resizer

Resize images locally with aspect-ratio controls, format selection, quality tuning, and download output.

Aspect lock
Format export
Preview

Image Converter

Convert images between PNG, JPEG, and WebP locally with optional resizing and quality controls.

Format conversion
Optional resize
Quality control

Screen Defect Test

Check dead pixels, stuck pixels, backlight bleed, gradients, uniformity, sharpness, and color patterns in fullscreen.

Fullscreen color cycle
Bleed and uniformity checks
Stuck-pixel flasher