Free online tools that run in your browser
BrowserTools is a growing collection of 158 focused utilities, converters, validators, encoders, calculators, networking helpers and a few classic games. Each one does a single job well, with no signup and no clutter.
Whenever a task can run on your own machine, it does: the file you paste, drop or type never leaves your browser, and there is nothing to install. The handful of tools that genuinely need a server (DNS, ping, WHOIS) call a small backend that does only what you ask and stores nothing about you.
- 158 tools
- 100% in your browser
- No signup
- No tracking
- Free & open in spirit
AI 8
AI Image Metadata Viewer
See the prompt and settings saved inside an AI-generated image, check whether it carries an AI label, and remove that data if you want.
Audio to Text
Turn a recording or video into text and subtitles, right in your browser, without uploading it anywhere.
Background Remover
Cut out the subject of a photo and get a transparent PNG, right in your browser, without uploading it.
ChatGPT Export Viewer
Open the data export you downloaded from ChatGPT or Claude, search your old conversations and save any of them as a document.
Image Upscaler
Make a small or blurry image bigger and sharper with AI, right in your browser.
AI API Cost Calculator
Find out what an AI model will cost you per request, per day and per month, and compare the main providers side by side.
llms.txt & AI Robots.txt Generator
Create an llms.txt file that tells AI assistants what your site is about, and robots.txt rules to allow or block AI crawlers.
Token Counter
See how many tokens your text uses in ChatGPT and other AI models, plus an estimate for Claude. Nothing leaves your browser.
Audio 7
Audio Compressor
Make audio files smaller by saving them as a lighter MP3, right in your browser.
Audio Converter
Convert audio files between MP3, WAV, OGG, M4A and FLAC, right in your browser.
Audio Joiner
Join several audio files into one track, in the order you choose.
Audio Trimmer
Cut out the part of an audio file you want to keep, quickly and without losing quality.
Guitar Tuner
Tune your guitar, bass or ukulele with your microphone, or any instrument in chromatic mode.
Metronome
A steady click to practise with: set the tempo, tap it in or pick a time signature.
Tone Generator
Play a pure tone at any frequency, for tuning, testing speakers or checking your hearing.
Calculators 14
Aspect Ratio Calculator
Resize an image or video without stretching it: enter a ratio and one side to get the other.
BMI Calculator
Work out your body mass index in metric or imperial units and see which weight range you are in.
Chmod Calculator
Work out Unix file permissions as numbers like 755 or letters like rwxr-xr-x, and see what they allow.
Compound Interest Calculator
See how your savings grow over time with regular deposits, with and without inflation.
Date Calculator
Work out someone's age, the time between two dates, or the date a number of days from now.
Discount Calculator
Work out the sale price after a discount, or the discount between two prices.
Golden Hour Calculator
Find the best light for photos: golden hour, blue hour, sunrise and sunset for any place and date.
Loan Comparison
Compare up to three loans side by side: monthly payment, total interest and total cost.
Mortgage Calculator
Work out your monthly mortgage or loan payment and see how the debt goes down over time.
Pace Calculator
Work out your running pace, finish time or distance, and see the split times for each kilometre or mile.
Percentage Calculator
Answer any percentage question: X% of Y, what percent X is of Y, or the change between two numbers.
Scientific Calculator
A full scientific calculator with trigonometry, logarithms, powers and a history of your results.
Tip Calculator
Work out the tip and split the bill between any number of people.
VAT Calculator
Add VAT to a price or take it out of a total, with the common EU rates ready to pick.
Converters 21
3D Model Viewer
Open 3D and CAD files (STEP, STL, OBJ and more) in your browser and save them in another format.
Binary Translator
Turn text into binary code and binary code back into readable text.
Bytes Converter
Convert file sizes between bytes, KB, MB, GB and TB, in both the decimal and the binary system.
Color Converter
Convert a color between HEX, RGB and HSL, and check whether two colors are readable together.
Cooking Converter
Convert cups, spoons and ounces to grams for flour, sugar, butter and other common ingredients.
CSV to JSON
Turn a CSV spreadsheet into JSON data, or JSON back into CSV.
Docker Run to Compose
Turn a docker run command into a ready-to-use docker-compose.yml file.
EV Efficiency Converter
Convert electric car efficiency between units like kWh/100km and mi/kWh, and estimate range and charging cost.
Fuel Consumption Converter
Convert fuel use between L/100km, MPG and km/L, and estimate what a trip will cost.
JSON to CSV
Turn JSON data into a CSV file you can open in Excel or Google Sheets.
JSON to TypeScript
Paste an example of your JSON data and get TypeScript types that describe it.
JSON to YAML
Convert data between JSON and YAML, in either direction.
Morse Code Translator
Turn text into Morse code and back, and hear it played as sound.
Number Base Converter
Convert a number between binary, octal, decimal, hexadecimal and other bases.
Number to Words
Write any number out in English words, including amounts of money for cheques.
Roman Numerals Converter
Turn numbers into Roman numerals and Roman numerals back into numbers.
Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin.
Text Case Converter
Change text to UPPERCASE, lowercase, Title Case and the formats programmers use.
Timestamp Converter
Turn a Unix timestamp into a readable date, or a date into a timestamp.
Time Zone Converter
See what time it will be in other cities for any date and time you pick.
Unit Converter
Convert everyday units of length, weight, temperature, time and data.
Encoders 10
Base64 Encoder & Decoder
Encode text or files to Base64, or decode Base64 back to text.
Base64 to File
Paste a Base64 string and download it as the real file it contains, with the file type detected for you.
Basic Auth Generator
Create or decode the login header that HTTP Basic authentication uses.
Bcrypt Generator
Create a bcrypt hash of a password, or check whether a password matches a hash.
Escape & Unescape
Make text safe to paste into HTML, JSON, XML, JavaScript, CSV or a URL, or undo it.
Hash Generator
Create a SHA fingerprint of any text or file to check that it has not changed.
JWT Decoder
See what is inside a JSON Web Token: its header, its data and when it expires.
JWT Generator
Create a signed JSON Web Token from your own data and secret key.
Text Encryption
Lock a message with a password so only someone who knows it can read it.
URL Encoder & Decoder
Make text safe to use inside a web address, or turn an encoded address back into plain text.
Entertainment 16
2048
Slide the tiles, merge equal numbers and try to reach the 2048 tile.
Aim Trainer
Click the targets as fast as you can to measure and improve your mouse accuracy.
Breakout
Bounce the ball, break every brick and clear the levels.
Connect Four
Line up four discs in a row against the computer or a friend.
CPS Test
Find out how many times per second you can click.
Retro Game Emulator
Load a ROM file and play classic console games like NES, SNES and Game Boy Advance.
FreeCell
The solitaire game where every card is face up and almost every deal can be won.
Minesweeper
Clear the board without hitting a mine, using the numbers as clues.
Reaction Time Test
Click as soon as the screen turns green and see how fast your reflexes are.
Simon
Watch the sequence of lights and sounds, repeat it, and see how far you can go.
Snake
Eat, grow longer and avoid hitting the walls or your own tail.
Solitaire
The classic Klondike card game, with Draw 1 or Draw 3.
Spider Solitaire
Build full suits from King to Ace, with one, two or four suits.
Sudoku
Fill the grid so every row, column and box has the numbers 1 to 9.
Tetris
Rotate the falling blocks, complete lines and beat your high score.
Typing Speed Test
See how many words per minute you type, and how accurately.
Generators 13
Barcode Generator
Create a barcode (EAN, UPC, Code 128 and others) and download it as an image.
Border Radius Generator
Round the corners of a box visually and copy the CSS.
Box Shadow Generator
Design a CSS shadow visually and copy the code.
Color Palette Generator
Get a set of colors that go well together, starting from any color you pick.
Cron Expression Generator
Build a cron schedule, or paste one to read it in plain English.
Cubic Bezier Generator
Shape a CSS animation curve by dragging two points and copy the code.
Gradient Generator
Create a CSS color gradient visually and copy the code.
Lorem Ipsum Generator
Get placeholder text to fill a design: paragraphs, sentences, words or lists.
Password Generator
Create a strong random password, or an easy-to-remember passphrase.
QR Code Generator
Create a QR code for a link, text, Wi-Fi network or contact card.
QR Code Scanner
Read a QR code with your camera or from an image.
SPF & DMARC Generator
Create the DNS records that stop others from sending email in your name, or check one you already have.
UUID Generator
Create unique IDs (UUIDs), one at a time or in bulk.
Images 12
EXIF Viewer & Remover
See the hidden data in a photo, like the camera and GPS location, and save a copy without it.
Favicon Generator
Turn any image into the small website icons browsers need, in every size.
HEIC to JPG
Turn iPhone HEIC photos into JPG, PNG or WebP pictures that open everywhere, without uploading them.
Image Color Picker
Pick any color from a photo and get its code, or the main colors of the whole image.
Image Compressor
Make images smaller in file size and compare the result with the original.
Image Converter
Convert images between PNG, JPG and WebP, right in your browser.
Image Cropper
Cut an image to the area you want, freely or to a set shape like square or 16:9.
Image Resizer
Change the size of an image in pixels or by percentage, without stretching it.
Image to ASCII Art
Turn a photo into a picture made of text characters.
Image to Text (OCR)
Copy the text out of screenshots, scans and photos, right in your browser.
Placeholder Image Generator
Create a dummy image of any size, color and text to use while designing.
SVG Optimizer
Make SVG files smaller by removing the extra data editors leave behind.
Misc 15
Countdown Timer
Count down the days, hours and minutes to any date.
Diff Checker
Compare two texts and see exactly what was added, removed or changed.
Gamepad Tester
Check that every button, stick and trigger on your controller works.
Keyboard Tester
Press any key to check that it works and find dead or stuck keys.
Mic Test
Check that your microphone works, see its level and hear a recording of your voice.
Notepad
Write notes that save automatically in your browser, no account needed.
Pomodoro Timer
Work in focused blocks with short breaks in between, with sound alerts.
Random Picker
Pick a random name from a list, flip a coin, roll dice or draw a number.
Screen Resolution Checker
See your screen resolution, window size, pixel density and refresh rate.
Stopwatch & Timer
A stopwatch with lap times and a countdown timer with an alarm.
Text Sorter
Sort a list alphabetically, remove duplicates, shuffle or number the lines.
Text to Speech
Paste any text and hear it read aloud, with a choice of voice and speed.
Webcam Test
Check that your camera works and see its resolution and frame rate.
Word Counter
Count the words, characters and paragraphs in a text, and how long it takes to read.
World Clock
See the current time in cities around the world at a glance.
Networking 8
DNS Lookup
See the DNS records of any domain, like its IP address, mail servers and TXT records.
IP Subnet Calculator
Enter an IPv4 range like 192.168.1.0/24 and get its mask, first and last address and number of hosts.
IPv6 Expander & Compressor
Write an IPv6 address out in full, or in its shortest standard form.
What's My IP
See your public IP address and what your browser tells the websites you visit.
Port Checker
Check whether a port on a server is open and how fast it answers.
URL Parser
Split a web address into its parts: domain, path, query parameters and more.
User-Agent Parser
Find out which browser, operating system and device a user-agent string describes.
WHOIS Lookup
See who registered a domain, when it expires and which registrar it uses.
PDF 14
Images to PDF
Put several images together into one PDF file, right in your browser.
Markdown to PDF
Turn Markdown text into a clean PDF, with a live preview as you write.
Compress PDF
Make a PDF file smaller, right in your browser, without uploading it.
Delete PDF Pages
Remove the pages you don't want from a PDF and download the rest.
PDF to Text
Copy all the text out of a PDF, or save it as a text file.
Merge PDF
Combine several PDF files into one, in the order you choose.
PDF Metadata Editor
Change or remove a PDF's hidden details, like its title, author and dates.
Add Page Numbers to PDF
Add page numbers to every page of a PDF, in the corner you choose.
Redact PDF
Black out private details in a PDF so they are really deleted, not just hidden under a box.
Rotate PDF
Turn all or some pages of a PDF the right way round.
Sign PDF
Draw, type or add a photo of your signature and put it on any page of a PDF, right in your browser.
Split PDF
Split a PDF into separate pages, or pull out just the pages you need.
PDF to Images
Save each page of a PDF as a PNG or JPG image.
Add Watermark to PDF
Stamp a text like CONFIDENTIAL across every page of a PDF.
Validators 9
Code Beautifier
Tidy up messy HTML, CSS or JavaScript, or squeeze it into as little space as possible.
IBAN Validator
Check whether an IBAN is written correctly and see what it is made of.
JSON Validator
Check whether JSON is valid, see exactly where it breaks, and format it neatly.
Password Strength Checker
See how strong a password is and roughly how long it would take to crack.
Regex Tester
Try out a regular expression on your own text and see what it matches.
Robots.txt Tester
Check whether a crawler like Googlebot or GPTBot may visit a page, and which line of robots.txt decides it.
Link Preview
See how a link to your page will look when shared on social apps and in search, and fix the missing tags.
SQL Formatter
Tidy up an SQL query so it is easy to read, or compress it onto one line.
XML Validator
Check whether XML is valid, see where it breaks, and format it neatly.
Video 11
GIF to Video
Turn an animated GIF into a much smaller MP4 or WebM video.
Subtitle Editor
Fix subtitles that appear too early, too late or drift away from the video, and convert them between SRT, VTT and ASS.
Extract Audio from Video
Save the sound of a video as an MP3 or other audio file.
Video Compressor
Make video files smaller, right in your browser, without uploading them.
Video Converter
Convert videos between MP4, WebM, MOV, MKV and other formats.
Mute Video
Remove the sound from a video without touching the picture.
Video Resizer
Lower a video's resolution, for example to 720p, to make it smaller.
Rotate Video
Turn a video the right way round, or flip it like a mirror.
Video Speed Changer
Speed up or slow down a video, with the sound adjusted to match.
Video to GIF
Turn a video clip into an animated GIF.
Video Trimmer
Cut out the part of a video you want to keep, quickly and without losing quality.
How these tools work
Most utilities here are client-side: the logic ships as a small JavaScript module that runs in your browser, so your text and files are processed locally and never uploaded. That keeps things fast, works offline once the page has loaded, and means a sensitive document (a PDF you need to split, an image you want to resize) stays on your device.
Every tool page includes a short explanation of what the tool does, worked context, and answers to common questions, so you can understand the format or technique, not just click a button. If a tool can ever give a wrong or surprising result for a particular input, we try to say so on the page.
Have an idea for a tool, spotted a bug, or got a result that looks off? Tell us on the contact page, feedback is how the catalogue improves. You can also read about who runs BrowserTools and our privacy approach.