Free Online Tools for Everyone

Format, beautify, validate and minify JSON with instant error checking.

Encode text to Base64 or decode it back — UTF-8 safe, instant.

Convert an image to a Base64 data URL or raw Base64 string — no upload.

Generate cryptographically secure UUID v4 identifiers, in bulk.

Convert Unix timestamps to dates and back, with a live epoch clock.

Percent-encode or decode URLs and query parameters correctly.

Generate MD5, SHA-1 and SHA-256 hashes from any text instantly.

Live word, character, sentence and reading-time counts as you type.

Test regex patterns with live highlighting and capture groups.

Convert colors between HEX, RGB and HSL with live preview.

Compare two texts and see added/removed lines highlighted.

Text to Morse code and back, live — with audio playback.

Turn plain text into glitchy, corrupted-looking Zalgo text.

Turn text into large block-letter ASCII art banners.

Encode or decode ROT13 text — the same button does both.

Turn text into strikethrough or underlined Unicode text you can paste anywhere.

Flip text upside down using real Unicode lookalike characters.

Convert text into leetspeak (1337) with adjustable substitution level.

Turn text into circled bubble-style letters using real Unicode characters.

Convert lowercase text into small capital Unicode letters.

Check if a password has appeared in a known data breach — without sending the password anywhere.

Generate strong random passwords with custom length and characters.

Create QR codes with live preview and PNG download — no watermark.

A ready-to-print QR code that rickrolls whoever scans it.

Your exact age in years, months, days — plus next-birthday countdown.

Body Mass Index from your height and weight, plotted on a visual scale.

Daily calorie needs (TDEE) from age, height, weight and activity level, with targets for losing, maintaining or gaining weight.

Basal metabolic rate from two standard formulas (Mifflin-St Jeor and Harris-Benedict), side by side.

Body fat percentage from tape measurements using the U.S. Navy method, with your ACE category.

Recommended daily water intake from body weight and activity level, in liters and glasses.

Find the best time to go to bed or wake up based on 90-minute sleep cycles.

Ideal weight range from height and sex, comparing five classic formulas at once.

Count the days until any future date, or the days since a past one.

Average your grades — simple or weighted — and find the final exam score you need.

Sunrise, sunset, solar noon and day length for any date and location.

Estimated due date, current pregnancy week and trimester from your last period.

Ovulation day, fertile window and next period from your cycle dates.

Start and end dates of your next 6 periods, from your cycle history.

X% of a number, what percent X is of Y, and percentage change.

Find the days between two dates, or add/subtract days, weeks, months and years.

Monthly payment and total interest for a fixed-rate loan.

Calculate a tip and split the bill — presets or custom percentage, instant.

Find your zodiac sign, its date range and a short trait from your birth date.

Weighted or unweighted GPA from letter grades — semester and cumulative.

Length, weight, temperature, area, volume and speed conversions.

Inches to centimeters and back — with screen-size charts for phones, laptops and TVs.

Miles to kilometers and back, plus nautical miles and running-distance charts.

Liters to milliliters and back — with a chart of bottles, cartons and kitchen volumes.

Work out fuel used and total cost for any trip from distance, consumption and fuel price.

Calculate the area of rectangles, circles, triangles and trapezoids, in m² or ft².

Calculate the final price, amount saved, or discount rate — including stacked discounts.

Calculate hours worked from clock-in/out times, deduct breaks, and total a week's hours and pay.

Solve A:B = C:X with cross multiplication. Supports direct and inverse proportion.

Compare current time across cities, see time differences, and convert a custom time between time zones.

Calculate running pace, predict a finish time, or find distance covered. Km/mile toggle, common race distances built in.

Find the GCD (greatest common divisor) and LCM (least common multiple) of two or more numbers, with step-by-step working.

Calculate the volume of cylinders, spheres, cubes, boxes and cones, in m³, cm³ or ft³.

Type two names and get a fun, instant love compatibility percentage. For entertainment only.

Daily protein, carb and fat targets in grams, based on your TDEE and your goal — cut, maintain or bulk.

Convert cups, tablespoons and teaspoons to ml or liters, and back — for cooking and baking.

Kilograms to grams and back — with a cooking chart of common recipe weights.

Bytes, KB, MB, GB and TB both ways, in decimal (1000) or binary (1024) base.

Convert text to UPPER, lower, Title, camelCase, snake_case and more.

Random numbers in any range — bulk, unique draws, sorting.

Generate CODE128, EAN-13, UPC-A and CODE39 barcodes with live preview and PNG download.

Shuffle a list fairly or pick N random winners — one item per line.

Compress JPG/PNG/WebP images locally — no upload, no limits.

Convert PNG images to JPG locally, with batch support.

Convert JPG images to lossless PNG locally, batch supported.

Convert WebP images to universally compatible JPG, locally.

Convert iPhone HEIC photos to JPG — private, on your device.

Resize images by pixel width or percent — aspect ratio kept.

Shrink JPG/JPEG files with adjustable quality — no upload.

Compress PNGs via palette quantization — transparency preserved.

Rasterize SVG vectors to PNG/JPG at any resolution, locally.

Turn an SVG into a real favicon.ico plus PNG icons at every standard size.

Shrink animated GIFs: colors, scale, frame-drop — no upload.

Convert a photo or image into shaded ASCII text art.

Convert a photo of a book or textbook page to text — auto-corrects crooked camera angles before recognizing.

Categorized AI prompts for students — one-click copy, ready to use.

Categorized AI prompts for teachers — one-click copy, ready to use.

AI prompts for principals, HR, counselors, compliance, facilities and more — one-click copy.

AI prompts for essays, exams, research, time management and career prep — one-click copy.

Decode a JWT's header and payload, with expiry status — instant, local, free.

Convert a JSON array to CSV — auto headers, proper escaping, copy or download.

Exact token count for GPT-4o or GPT-4/3.5 — real tokenizer, not an estimate.

Estimate and compare GPT, Claude, Gemini, DeepSeek, Qwen, Kimi, GLM and Grok API costs from your token counts.

Remove duplicate lines, blank lines and extra spaces — all in one tool.

Convert Simplified/Traditional Chinese with regional standard support.

Chinese to Pinyin, 4 formats, smart multi-reading detection.

Decode a QR code from an uploaded image — local, no app needed.

Generate robots.txt — presets for AI crawlers, custom paths, sitemap.

Convert numeric amounts to Chinese uppercase currency format.

Convert a numeric amount into the words format required on a check.

Drag sliders to round each corner and copy the border-radius CSS.

Adjust sliders for offset, blur, spread and color, then copy the box-shadow CSS.

Shrink HTML for production or beautify it for readability — no upload, size savings shown.

Shrink CSS for production or beautify it for readability — no upload, size savings shown.

Shrink JavaScript for production or beautify minified code for readability — no upload, size savings shown.

Combine multiple PDFs into one, in any order — no upload.

Extract page ranges from a PDF, or split into single pages — no upload.

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text at once.

Design a fake iMessage conversation and export it as a PNG — for mockups and memes only.

Design a fake WhatsApp conversation and export it as a PNG image, entirely in your browser.

Black-box, pixelate or blur faces, ID numbers and license plates in a photo, entirely in your browser.

Explore JSON as a collapsible tree with search, built for large and deeply nested structures.

Final balance and total interest from principal, rate, term and monthly deposits, with a yearly breakdown.

Drag a selection box to crop any image, with free or fixed aspect ratios, and download as PNG or JPG.

Pick any color visually or sample it from an uploaded image, with HEX, RGB and HSL output and copy buttons.

Turn text into cursive, gothic and outline Unicode styles you can paste anywhere.

Generate elf, dwarf, orc and other fantasy names for D&D, games and fiction.

Generate cool, cute or gaming username ideas from your keyword.