Free Online Tools for Developers and Creators

Free browser-based utilities for JSON, Base64, Regex, PDFs, images, SEO previews, text editing, colors, calculators, and technical references. No sign-up required.

Visual Tools

Free online image tools: compress, convert, extract colors, and download YouTube thumbnails with browser-friendly workflows.

Image Compressor - Compress JPG and PNG images with a quality slider from 10 to 100 percent. See the size you save before you download. Images are not uploaded to a server.
Format Converter - Convert an image to JPG, PNG or WebP in your browser. Set the quality for JPG and WebP output. PNG output keeps transparency, and files stay on your device.
Color Extractor - Upload an image to get its 5 dominant colors and the share of each. Copy any color as a HEX or RGB code. The image is analyzed in your browser, not uploaded.
YouTube Thumbnail - Paste a YouTube video or Shorts link, or a video ID, to get its thumbnail in 4 sizes from 320x180 up to 1280x720. Open any size as a JPG image to save it.
Image Resizer KB - Set a target size in KB and compress a JPG, PNG or WebP image to fit it. The tool lowers quality first, then dimensions if needed, and keeps the format.
PNG to ICO - Convert a PNG image into one multi-size ICO file. Pick any of 6 sizes from 16x16 to 256x256 pixels. The file is built in your browser and downloads directly.
Image Cropper - Crop an image by dragging the crop box, freely or at 1:1, 4:3, 16:9 or 3:2. Save the result as a PNG or JPEG file. The image is processed in your browser.
HEIC Converter - Convert several iPhone HEIC or HEIF photos at once to JPG or PNG. Set the JPG quality from 10 to 100 percent and download each file. Photos are not uploaded.
OCR Text - Extract text from a JPG, PNG, BMP or WebP image with Tesseract.js. Choose from 14 languages, including English and Turkish, then copy or download the text.
TeamSpeak Avatar Resizer - Resize an image so its longest side is 320 pixels, the TeamSpeak avatar limit, and keep its aspect ratio. Compare the file sizes before you download it.

Dev Tools

Free developer tools: JSON formatter, Base64 encoder, regex tester, QR code generator, and password generator. All browser-based.

JSON Formatter - Format, validate and minify JSON in your browser. Choose 2 or 4 space indentation, see the parser error for invalid JSON and copy the result.
Base64 - Encode text to Base64 or decode Base64 back to text as you type. UTF-8 support handles accented letters and non-Latin scripts. It runs in your browser.
Regex Tester - Test JavaScript regular expressions against your own text. Toggle the g, i, m and s flags and see each match highlighted, with a match count, as you type.
QR Code - Create a QR code from a URL or text. Set the colors, a size from 128 to 512 pixels and the error correction level, then download the code as a PNG image.
Password Generator - Generate 1 to 20 random passwords of 6 to 64 characters with letters, numbers and symbols. They come from crypto.getRandomValues and stay in your browser.
URL Encoder - Encode text for URLs and see the encodeURIComponent and encodeURI results side by side. Decode percent-encoded strings and get a warning for invalid input.
HTML Entity - Encode the characters & < > " and ' as HTML entities, or decode named and numeric entities back to text. A reference table lists 28 common entities.
Hash Generator - Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes from text as you type. Switch between upper and lower case hex output and copy any hash in one click.
JWT Decoder - Paste a JWT to see its header and payload as formatted JSON, the algorithm and whether it has expired. It decodes only and does not verify signatures.
Code Minifier - Paste HTML, CSS or JavaScript to remove comments and extra whitespace. See the bytes saved as a percentage, then copy the code or download the minified file.
cURL Builder - Build a cURL command with GET, POST, PUT, PATCH or DELETE, custom headers, Bearer or Basic auth and a request body. Add the -k, -L or -v flags and copy it.
SQL Formatter - Format SQL queries with upper or lower case keywords, 2 or 4 space indents and optional line breaks before AND and OR. Strings and comments stay untouched.
CSV to JSON Converter - Convert CSV to JSON or JSON back to CSV. Detect the delimiter or choose comma, semicolon or tab, use the first row as headers and download the result.
Cron Expression Parser - Paste a 5-field cron expression to get a plain English description and the next 5 run times in your local time. Lists, ranges and step values are supported.
Color Code Converter - Paste a list of colors, one per line, in HEX, RGB or HSL format. Get HEX, RGB, HSL, RGBA and HSLA values with a swatch for each, and copy one or all of them.

Text & PDF

Free text and PDF tools: merge, split, compress PDFs; text case converter, markdown editor, diff checker, and lorem ipsum generator.

PDF Tools - Merge several PDF files in the order you choose, or extract a page range such as 1-3, 5 into a new PDF. Files are processed in your browser with pdf-lib.
Text Tools - Count characters, words, sentences and paragraphs, and see the read time. Convert text to upper, lower or title case, remove duplicate lines or trim spaces.
Markdown Editor - Write GitHub Flavored Markdown and see the rendered preview next to it. Switch between split, editor and preview modes, and copy the Markdown or the HTML.
Text Diff - Paste two versions of a text to compare them line by line. Added and removed lines are highlighted and counted, and you can copy the changes as a list.
Lorem Ipsum - Generate 1 to 10 paragraphs of Lorem Ipsum placeholder text with 10 to 150 words each. Copy the text in one click for mockups, wireframes and page layouts.
Bold Text Generator - Convert letters to 8 Unicode styles, including bold, italic, monospace, double-struck, script and Fraktur. Copy any style to paste into bios, posts and chats.
Small Caps Generator - Convert text to 6 Unicode styles: small caps, superscript, subscript, circled, squared and fullwidth. Each style updates as you type and copies in one click.
Upside Down Text - Flip text upside down, reverse its order, or add strikethrough and underline marks. Generate Zalgo text at low, medium or high intensity and copy each result.
Morse Code - Translate text to Morse code and Morse back to text. It covers letters, digits and 18 punctuation marks, plays the code as a 600 Hz tone and has a chart.
Online Notepad - Write plain text notes that save to your browser as you type. See character, word and line counts, use fullscreen mode and download the note as a .txt file.
Writing Analyzer - Paste English text to get Flesch Reading Ease and Flesch-Kincaid grade scores, word and sentence counts, reading and speaking time and the top 10 words.

Design Tools

Free design tools: color palette generator, color converter, CSS gradient builder, and box shadow generator. No installation needed.

Color Palette - Pick a base color and build a palette from 6 schemes, such as complementary, triadic, analogous and tetradic. Lock colors and copy HEX codes or CSS variables.
Color Converter - Convert colors between HEX, RGB and HSL with a color picker and sliders. All values update together with a live preview, and you can copy each format.
CSS Gradient - Build linear, radial or conic CSS gradients. Set the angle, add color stops at any position from 0 to 100 percent and copy the background CSS line.
Box Shadow - Design a CSS box-shadow with offset, blur, spread, color, opacity and inset controls. Stack several layers, check the live preview and copy the CSS code.
Font Pairer - Pick heading and body fonts from 18 Google Fonts or start from 4 suggested pairs. Preview them together and copy the CSS font-family and @import code.
Contrast Checker - Enter text and background colors to get the WCAG contrast ratio. See pass or fail for AA and AAA at normal and large text sizes, with a live preview.
SVG Editor - Paste SVG code to preview it live. Find and replace a color, then copy the SVG or download it as a file. Scripts and event handlers are removed for safety.
Border Radius Generator - Set each corner radius from 0 to 100 px or link all four corners. Start from the pill, circle, leaf or ticket preset and copy the border-radius CSS.
Glassmorphism Generator - Adjust opacity, blur, saturation and tint color to create a frosted glass effect. Preview it over 6 gradient backgrounds and copy CSS with the webkit prefix.
Text Shadow Generator - Stack text-shadow layers with X and Y offset, blur and color for each. Start from neon, emboss, retro, fire or 3D presets, edit the preview and copy the CSS.

Finance Tools

Free finance calculators: severance pay, fuel cost, VAT, meeting cost, car rental, and more. Quick, accurate, browser-based.

Severance Pay - Convert gross salary to net and get severance pay from your start and end dates. Presets cover Turkey, Germany, Spain and Italy, with Turkish notice pay.
Fuel Cost - Enter distance, fuel use and price to get the fuel needed and the total cost. Use km and L/100km or miles and mpg, and split the cost among up to 5 people.
Percent & VAT - Calculate discounts, add or remove VAT at 1, 10 or 20 percent, and solve 5 percentage formulas such as X percent of Y and percent change between two values.
VP / Robux - Convert Valorant VP, Roblox Robux, LoL RP, Fortnite V-Bucks and PUBG UC to TRY, EUR or USD with package prices. Prices are built in, so check the store first.
Meeting Cost - Enter the average monthly salary and 1 to 30 attendees, then start the timer to watch the meeting cost grow. It also shows the cost per hour, day and year.
Car Rental Glossary - Search common car rental contract terms such as CDW, damage form marks and pickup rules. Each entry has a plain explanation, with tips and warnings.
Farm Chemical Calc - Enter tank size, water per decare and product dose to get the amount of chemical per tank, the area each tank covers and the number of tanks for your field.
Tile & Floor Calc - Add rooms by length and width, pick a tile size from 30x30 to 120x120 cm and set a waste rate. Get tile and box counts, cost, grout and adhesive amounts.

Health Tools

Free health tools: macro calculator, BMI calculator, unit converter, and eye break timer (20-20-20 rule). Privacy-first.

Macro & Calorie - Get BMR from the Harris-Benedict formula and daily calories for 5 activity levels. See protein, carb and fat targets in grams to lose, keep or gain weight.
BMI Calculator - Enter your height in cm and weight in kg to get your BMI and its category, from underweight to obese. Extra tabs calculate your exact age and percentages.
Unit Converter - Convert length, weight, temperature, area and speed units. Enter a value once and see the result in every unit of that category, both metric and imperial.
Eye Break 20-20-20 - Work for 20 minutes, then look away for 20 seconds. The timer plays a beep at each switch and runs for 4 to 16 cycles in a browser tab, with no install.
Calorie Calculator - Calculate BMR with the Mifflin-St Jeor equation and daily calories for 5 activity levels. See maintenance calories plus 500 below and above for weight goals.
Water Intake Calculator - Estimate daily water intake from your weight, activity level and climate. See the result in liters, 250 ml glasses and milliliters per hour over 16 hours.
Sleep Calculator - Find bedtimes or wake-up times based on 90-minute sleep cycles plus 14 minutes to fall asleep. See options for 3 to 6 cycles with a rating for each one.
Heart Rate Zone Calculator - Enter your age to get 5 heart rate training zones from 50 to 100 percent of your maximum. Add your resting heart rate to use the Karvonen method.
Body Fat Calculator - Estimate body fat percentage from height, neck, waist and, for women, hip measurements in cm. See your fat mass, lean mass and body fat category.
Pregnancy Calculator - Enter the first day of your last period to estimate your due date and conception date. See your current week, trimester, days remaining and key milestones.

Fun Tools

Free fun tools: AI prompt builder, decision wheel, CPS test, keyboard tester, nickname generator, countdown timer, and more.

AI Prompt Architect - Build image prompts from a subject, style, quality level and aspect ratio. Copy versions for Midjourney, DALL-E 3 and Stable Diffusion with a negative prompt.
Decision Wheel - Add 2 to 20 options to the wheel and spin it to pick one at random. Each option gets its own colored segment, and the result appears after a 4-second spin.
CPS Test - Click as fast as you can for 5, 10, 15 or 30 seconds. The test shows your live click count, your clicks per second and a rank that goes up to 15 or more CPS.
Keyboard Test - Press keys to light them up on an on-screen QWERTY layout. The test counts the keys you tested and the most keys held at once, which helps you spot ghosting.
Nick Generator - Type a nickname of up to 40 characters and see it in 16 Unicode styles, such as bold, script, Fraktur, circled and framed. Copy any style in one click.
Countdown Timer - Create several countdowns that show days, hours, minutes and seconds. Timers are saved in your browser, and a share link lets others open the same countdown.
Gacha Habit Machine - Complete daily tasks to earn tokens, then spend them on card pulls. Collect 17 cards in common, rare, epic and legendary tiers. Progress saves locally.
Tinder Task Cleaner - Add your tasks and swipe each card right to do it or left to skip it. At the end you see how many you kept and get a numbered list of the tasks to do.

Social Tools

Free social and productivity tools: white noise generator, hashtag finder, invisible character, date calculator, and Pomodoro timer.

White Noise - Mix 8 sounds, including rain, wind, ocean, fireplace and white noise, with a volume slider for each. Start from 4 presets for sleep, focus, relax or storm.
Hashtag Bank - Browse 8 categories with 30 hashtags each, plus caption templates. Copy a full set or click a single tag to copy it. Most tags and captions are in Turkish.
Invisible Character - Copy 6 invisible Unicode characters, including the zero-width space U+200B. Repeat a blank character up to 100 times, or repeat your own text line by line.
Date Difference - Find the time between two dates in years, months, weeks and days, plus the total days, hours, minutes and seconds. Presets include today to New Year.
Pomodoro Timer - Run focus sessions with short and long breaks. Set work time from 5 to 90 minutes and a long break every 2 to 8 sessions. The countdown shows in the tab.

Expert Guides

Free visual reference guides: traffic signs, dashboard warning lights, laundry symbols, AC remote symbols, and plastic recycling numbers.

Traffic Signs - Look up 52 traffic signs in 4 groups: warning, prohibitory, information and priority. Search by name to read what each sign means before your driving test.
Dashboard Lights - Look up 20 common dashboard warning lights grouped by color: red, yellow, blue and green. Filter by urgency, search by name and read what to do for each.
Laundry Symbols - Read the meaning of 33 care label symbols for washing, bleaching, drying, ironing and dry cleaning. Each symbol has a short name and a plain description.
AC Remote Symbols - Learn 22 air conditioner remote symbols for cool and heat modes, fan speed, air direction and special functions. Each symbol has a short explanation and tips.
Plastic Numbers - See what resin codes 1 to 7 mean, from PET to other plastics. Each code shows microwave, heat and dishwasher safety, recyclability and common uses.

SEO Tools

Free SEO tools: slug generator, meta tag generator, robots.txt builder, OG tag previewer, Twitter Card generator, keyword density analyzer, and .htaccess generator.

Slug Generator - Turn a title into a URL slug. Accented letters, such as Turkish and German characters, become plain letters. Use a hyphen, underscore or dot as the separator.
Meta Tag Generator - Generate title, description, canonical, Open Graph and Twitter Card meta tags. Length counters and a Google result preview help you check them before copying.
Robots.txt Generator - Build a robots.txt file with allow and disallow rules per user agent, crawl delay and a sitemap URL. Presets allow all bots, block all or block 4 AI crawlers.
OG Tag Previewer - Enter an Open Graph title, description, image URL and site name to preview the share card on Facebook, LinkedIn and Discord. Then copy the og meta tags.
Twitter Card Generator - Create Twitter Card meta tags for summary, large image, app and player cards. Add site and creator handles, preview the card and copy the escaped meta tags.
Keyword Density - Paste text to see the top 20 keywords as single words or 2-word and 3-word phrases, with counts and density. A stop word filter covers 5 languages.
.htaccess Generator - Generate Apache .htaccess rules for HTTPS, www redirects, 301 and 302 redirects, GZIP, browser caching, custom error pages and hotlink and IP blocking.
Rank Tracker - Log keyword positions by hand with a date, URL and notes. See the current position, highest position and change since the last check. Data stays local.
Keyword Research - Enter a seed keyword to get up to 21 long-tail ideas built from common prefixes and suffixes. Add your own search volumes, then copy the list or export CSV.
Site Audit - Work through a 20-item SEO checklist for crawlability, indexing, performance and security. Your checkmarks are saved in your browser and give a percent score.
Backlink Monitor - Log backlinks with source, target, anchor text, link type, DR and status. Filter and sort the list, view stats and export CSV. Data is saved in your browser.
Site Explorer - Enter a domain to get 14 ready links for index checks, Wayback, WHOIS, DNS, SSL tests and page speed tools. Your last 10 domains are saved in your browser.
Competitor Insights - Record competitors with domain, estimated traffic, top keywords, backlinks and notes. The list is saved in your browser, and you can export it as a CSV file.
Traffic Overview - Log monthly sessions, users, pageviews, bounce rate and session duration. Compare the latest month with the previous one and export the data as a CSV file.
AI Search Visibility - Score your site on a 16-item checklist for content, structure, technical setup and authority. Copy 6 prompt templates to test how AI assistants describe it.
SEO Checker - Check a page against 19 on-page, technical and content items for a percent score. Preview your title, description and URL as a Google result with limits.

Jewel Crash - Swap jewels to match 3 or more on an 8x8 board. Reach each level goal within limited moves, earn up to 3 stars and use row, column, bomb and rainbow gems.
2048 - Slide tiles on a 4x4 grid with arrow keys, WASD or swipes. Equal numbers merge until you reach 2048, and you can keep playing after. Your high score is saved.
Snake - Steer the snake on a 20x20 grid with arrow keys, WASD or swipes. It speeds up every 5 foods, and wrap mode lets you pass through walls. High score is saved.
Minesweeper - Play Minesweeper on Easy 9x9, Medium 16x16 or Hard 16x30 boards. The first click is always safe, and you flag mines with a right-click or a long press.
Block Stacker - Rotate and drop 7 block shapes on a 10x20 board to clear full lines. Use hold, a ghost piece and the next piece preview. The speed rises every 10 lines.
Sky Hopper - Tap, click or press Space to flap through the gaps between pipes. The gaps narrow as your score climbs, and medals start at 10 points. High score is saved.
Breakout - Move the paddle with the mouse, touch or arrow keys to bounce the ball into 80 bricks. You have 3 lives, and the ball gets 10 percent faster each level.
Memory Match - Flip cards to find matching pairs on a 4x4, 6x4 or 6x6 grid with 8 to 18 pairs. A move counter and timer track each game, and your record time is saved.
Word Guess - Guess a random 5-letter English word in 6 tries. Colored tiles show correct and misplaced letters, and your streak and guess distribution are saved.
Hangman - Guess the hidden word one letter at a time before 6 wrong guesses. Words come from 5 categories: animals, countries, foods, sports and colors.
Sudoku - Solve generated 9x9 Sudoku puzzles that each have one solution. Use notes mode, undo and conflict highlighting, and play with the keyboard or a number pad.
Nonogram - Solve 15 picture logic puzzles at 5x5, 10x10 and 15x15. Fill cells from the row and column clues or mark them with an X. Your record times are saved.
Solitaire - Play Klondike Solitaire with draw-1 from the stock. Double-click to send cards to the foundations, undo moves and track your score, wins and time.
Tower Defense - Place arrow, cannon, ice and zap towers along the path to stop 20 waves of enemies. Upgrade towers up to level 4 or sell them for 60 percent of the cost.
Arena Duel - Create a gladiator with 5 stats, buy gear and potions, and fight 10 arena opponents in turn-based battles. Unlock 5 abilities. Progress saves in your browser.
Maze Chase - Eat every dot in the maze while 4 ghosts chase you. Power pellets let you eat the ghosts for points. Play with arrow keys, WASD or swipes, with 3 lives.
Alien Defense - Move your cannon and shoot down an 11 by 5 alien swarm before it lands. Hide behind shields that wear down, hit the bonus UFO and survive with 3 lives.
Paddle Ball - Play a two-paddle ball game against a computer opponent with 3 difficulty levels. Move your paddle with arrow keys, the mouse or touch. First to 7 wins.
Sketch Jump - Jump from platform to platform and climb as high as you can. Watch for moving and breaking platforms, use springs, and shoot or stomp monsters.
Fruit Slicer - Swipe with the mouse or a finger to slice flying fruit. Classic mode has 3 lives and bombs. Zen mode gives you 60 seconds with no bombs. Combos add points.
Cookie Tapper - Click the cookie to bake, then buy 8 building types that bake for you. Catch golden cookies for bonuses and prestige after a trillion cookies.
Piano Tiles - Tap the black tiles in 4 lanes with touch or the D, F, J and K keys. Play Classic with 50 tiles against the clock, endless Arcade or a 30-second Zen mode.
Four in a Row - Drop discs into a 7 by 6 grid and line up four before the computer does. Choose Easy, Medium or Hard, and play with the mouse, touch or arrow keys.
Checkers - Play checkers on an 8x8 board against a computer opponent at Easy, Medium or Hard. Captures are forced, multi-jumps are allowed and pieces become kings.
Tic Tac Toe - Play X against the computer on a 3x3 grid. Easy and Medium make random mistakes, and Hard plays perfect moves. Wins, losses and draws are saved per level.
Bubble Shooter - Aim and shoot bubbles to pop groups of 3 or more of the same color. An aim line guides each shot, and the ceiling drops every 6 shots until you clear it.
Cube Dash - Jump over spikes with one button across 3 levels. Pass gravity and speed portals, and use practice mode with checkpoints. Progress is saved per level.
Color Gate - Tap to bounce your ball through the part of each obstacle that matches its color. Collect stars for points and touch color orbs that switch your ball color.
Mole Smash - Hit moles as they pop out of 9 holes in 60-second rounds. Golden moles give bonus points, helmet moles need two hits and bomb moles cost you a life.
Road Hopper - Hop across roads, rivers and railroads without getting hit. Ride logs over the water and watch for train warnings. Play with arrow keys, WASD, taps or swipes.
Tower Bounce - Rotate the tower to drop a bouncing ball through the gaps. Avoid danger segments, smash through after a 3-combo and grab shield, slow-motion and x2 power-ups.
Stack - Tap to drop each sliding block on the tower. Overhanging parts are cut off, and 3 perfect drops in a row widen the block again. Speed rises with each block.
Knife Throw - Throw knives into a spinning log without hitting the knives already in it. The log changes speed and direction, and every fifth level is a boss level.
Water Sort - Pour colored water between tubes until each tube holds one color. Levels start with 3 colors and grow to 8. Use undo, restart and 3 hints on each level.
Tall Man Run - Run through gates that add, multiply, subtract or divide your height. Avoid walls and gaps, collect coins and power-ups, and beat the boss at the end.
Parking Jam - Slide cars in their lanes to clear a path for the red car to exit. Play 25 levels on 6x6 to 8x8 grids with undo, 3 hints and stars based on your move count.
Balloon Guard - Drag a shield to push blocks, bars and spikes away from a rising balloon. One hit ends the game. Freeze, slow and double shield power-ups help you last.
City Hole - Move a hole through the city and swallow people, cars and buildings to grow. Compete with 3 computer holes in a 2-minute round and finish with the top score.
Gladiator Quest RPG - Build a gladiator with 7 stats and 8 gear slots. Fight in the arena, clear 3 expeditions of 4 stages each and unlock talents. Progress saves in your browser.
Zigzag - Tap or press Space to switch the ball between two diagonal directions and stay on the isometric path. The speed rises with every tile you pass.
Bouncy Ball - Bounce a ball upward on normal, moving and breakable platforms. Tap to boost in mid-air, steer with the arrow keys and wrap around the edges of the screen.
Color Match - Tap to drop the ball into a spinning color wheel when the matching section lines up. The wheel grows from 4 to 8 sections and spins faster as you score.
Basket Dunk - Drag and release to shoot with a dotted trajectory guide. A swish scores 3 points, the hoop moves after each basket and the rim shrinks. One miss ends it.
Drift Pro - Tap to switch your drift direction and keep the car on a winding road. The road narrows and the car speeds up as you go. Your score is the distance you drive.
Pizza Chef - Read each order, tap the right toppings and serve the pizza before the timer runs out. Orders grow to 4 toppings from 8 options, and the timer gets shorter.
Hopscotch - Tap left or right to hop onto the next tile before time runs out. The hop timer shrinks from 2 seconds to 0.6 seconds, and crumbling fake tiles appear later.
Color Road - Steer your ball across 3 lanes and collect only the balls that match its color. Your color changes every 8 pickups, and the road keeps getting faster.
Merge Link - Tap two nearby bubbles with the same number to merge them into double the value. New bubbles keep spawning, and the game ends when the board fills up.
Neon Maze - Find the exit of each maze before time runs out. Mazes grow larger every level, up to 12 by 10 cells, and the seconds you have left add to your score.
Wall Breaker - Aim and fire a volley of balls at numbered blocks on a 7-column grid. Blocks gain more hit points each round, and the game ends when they reach the bottom.