Tools

Password-based AES-256-GCM demo via Web Crypto.

Age in years, months, and days between two dates.

Convert area units like acres, hectares, and m².

Convert text to character codes and back.

Simplify a ratio and scale to a target dimension.

Unicode-safe Base64 encode/decode for text and files locally.

Convert text to binary and binary to text.

BMI and weight category in metric or imperial.

Adjustable-shift Caesar cipher, encode and decode.

Client-side canonical URL heuristics (no crawl).

Convert naming cases locally with smart word splitting.

Sorted character frequency report with percentages.

Flip virtual coins with fair, local randomness.

Convert HEX, RGB, and HSL locally with a live swatch.

Blend two HEX colors with a mix ratio.

Sample image colors and copy hex/rgb locally.

Find complementary and split-complementary colors.

Future value and interest earned from compounding.

Check WCAG AA/AAA contrast ratios for text colors.

Count down from a duration or to a target time.

Turn cron expressions into readable schedules.

Map CSS color names to HEX and back.

Convert bytes, KB, MB, GB, TB, and binary units.

Roll virtual dice with fair, local randomness.

Line-level text diff with inline and side-by-side views.

Final price and savings from a percent-off discount.

Pull deduplicated email addresses from text.

Find and replace text with optional regex support.

Weighted 4.0-scale GPA from grades and credits.

Build CSS linear-gradient strings with a live preview.

SHA-256/512 hashing for text and files via Web Crypto.

Convert text to hex and hex to text.

HMAC-SHA256/384/512 signing via Web Crypto.

Tune hue, saturation, and lightness from a base HEX.

HTML entity encode/decode for markup and text locally.

Parse raw HTTP headers into a structured list.

Compress images locally with quality and size controls.

Crop images with accessible numeric controls.

Convert images to PNG, JPEG, or WebP locally.

Resize images by size or percent, locally.

Convert JSON arrays to CSV and back locally.

Format, validate, and minify JSON locally in your browser.

Minify JSON locally into a compact single-line string.

Validate JSON locally with clear syntax error messages.

Convert JSON and YAML both ways in your browser.

Inspect JWT header and payload locally—no signature verify.

Local text stats and keyword density (no snake oil).

Convert length units instantly in your browser.

Remove duplicate lines from a list instantly.

Sort lines A–Z or Z–A instantly.

Shuffle or pick unique random entries from a list.

Amortized monthly loan payment and total interest.

Autosaving notepad that stays on your device.

Local lorem ipsum by paragraphs, words, or bytes.

Live GFM preview with sanitized, XSS-safe rendering.

SERP-style meta title and description preview.

Convert bin/oct/dec/hex locally with BigInt.

OG card layout mocks and meta tag export.

Generate complementary, analogous, and triadic palettes from a base HEX.

Secure local password generator with strength meter.

Local entropy and checklist-based password strength check.

Merge PDFs locally with full order control.

View and edit basic PDF metadata locally.

Extract PDF page ranges locally with validation.

Inspect PEM structure and Base64 body locally.

Percent of, percent-of-total, and percent change.

Focus with automatic Pomodoro work/break cycles.

Check primality and list primes up to a limit.

Create PNG/SVG QR codes locally—no API.

Parse and build URL query strings safely, client-side.

Generate random HEX colors with crypto randomness.

Generate random integers in any range, locally.

Generate random strings with custom character sets.

Estimate minutes-to-read from word count and WPM.

Test regex patterns with flags, highlights, and safe timeout protection.

Strip blank and whitespace-only lines instantly.

Join wrapped lines into flowing paragraphs.

Form-based robots.txt builder with download.

Convert numbers to and from Roman numerals.

Classic ROT13 letter-shift cipher, encode = decode.

Check for missing common security response headers.

Build basic sitemap XML from a URL list.

URL slugify with diacritic stripping, locally.

Convert speed units like mph, km/h, and knots.

Count, mean, median, mode, and stdev from a list.

Time tasks with a start/stop/lap stopwatch.

Sanitize, preview, and clean SVG locally.

Convert Celsius, Fahrenheit, and Kelvin instantly.

Repeat text N times with an optional separator.

Reverse text, lines, or words instantly.

Convert Unix timestamps and dates with timezone display.

Generate tints and shades from a base HEX color.

Tip amount, total, and per-person bill split.

Approximate prompt tokens locally without calling an AI API.

Build unsigned JWTs for learning—never for production.

URL percent-encoding with component and URI modes locally.

Generate UUID v4 and v7 IDs locally with bulk output.

Add or remove VAT and see net/gross amounts.

Convert volume units for cooking, science, and more.

Convert weight and mass units locally.

Trim and normalize whitespace in text instantly.

Live word, character, sentence, and line counts.

Get a weighted random Yes or No answer.