What do you need to do?
31 tools live, 693 in the catalog. Most run entirely in your browser — no upload, no account, no watermark.
Try “compress image”, “json”, “base64” or “how old am I”.
Popular tools
Image Compressor
Reduce image file size with an adjustable quality setting and an instant before/after comparison.
JSON Formatter
Format, validate and minify JSON with clear error messages that point at the exact position.
Word Counter
Count words, characters, sentences, paragraphs and estimated reading time as you type.
Secure Password Generator
Generate strong random passwords using the browser's cryptographic random number generator.
Image Resizer
Resize an image to exact pixel dimensions or a percentage, with the aspect ratio locked by default.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 back to text, with UTF-8 and URL-safe support.
Unix Timestamp Converter
Convert Unix timestamps to human dates and back, in local time and UTC, with ISO 8601 output.
Percentage Calculator
Work out a percentage of a number, what percentage one number is of another, and percentage change.
Browse by category
Image
Compress, resize, convert and inspect images
Merge, split, convert and secure PDF files
Video
Trim, convert and extract from video
Audio
Cut, convert and clean up audio
Developer
Format, validate and inspect code and data
Text
Count, clean, convert and compare text
Converters
Units, formats and data structures
Calculators
Maths, money, health and everyday sums
Generators
Create codes, keys, placeholders and assets
Business
Invoices, quotes and business maths
SEO
Metadata, structured data and previews
Security
Hashes, encoding, tokens and keys
Productivity
Timers, lists, notes and device checks
Student
Grades, study timing and citations
Web
URLs, CSS, HTTP and browser info
Recently added
Age Calculator
Calculate exact age in years, months and days, plus total days and the next birthday.
BMI Calculator
Calculate body mass index from height and weight, in metric or imperial units.
Loan & EMI Calculator
Calculate the monthly repayment, total interest and total cost of a loan from amount, rate and term.
Percentage Calculator
Work out a percentage of a number, what percentage one number is of another, and percentage change.
Temperature Converter
Convert between Celsius, Fahrenheit and Kelvin with the formulas shown.
Unix Timestamp Converter
Convert Unix timestamps to human dates and back, in local time and UTC, with ISO 8601 output.
Browse A–Z
How WebKitool works
Your files stay with you
Image, text and code tools here process data in the page using browser APIs. Where a tool needs a server, its page says so before you start.
No account, no watermark
Every published tool is usable immediately and in full. There is no sign-up wall and no degraded free tier.
Built in order of usefulness
A tool gets a page once it works and has been tested — not before. The rest of the catalog is listed as planned.