Free online tools that respect your time and your data.

How do word counters count words? Differently, and almost none of them say how. These text tools print their rules so you can see the disagreements.

• Word CounterCount words, characters, sentences and paragraphs as you type — and see exactly which rules were used, so you know where other counters will disagree.
• Character CounterSoonCheck text against character limits for social posts, meta descriptions, and form fields.
• Case ConverterSoonConvert text between sentence case, title case, UPPERCASE, lowercase, camelCase, and snake_case.
• Text CleanerSoonStrip extra spaces, line breaks, and invisible characters pasted in from other documents.

Is it safe to paste JSON into an online tool? Only if it never sends your payload anywhere. These do not, and you can verify that yourself.

• JSON FormatterFormat and validate JSON, with errors that name the exact line, column and likely cause instead of repeating what the parser said.
• JSON ValidatorSoonCheck whether JSON is valid and get the line and column of the first syntax error.
• JSON MinifierSoonStrip whitespace from JSON to reduce payload size before shipping it over the wire.
• Base64 EncoderSoonEncode text or files to Base64 without uploading anything to a server.
• Base64 DecoderSoonDecode Base64 back to readable text or a downloadable file, entirely in the browser.
• UUID GeneratorSoonGenerate v4 UUIDs in bulk using the browser's built-in cryptographic randomness.
• JWT DecoderSoonInspect the header and payload of a JSON Web Token locally — tokens are never transmitted.

Do online image tools upload your photos? Four of the six I checked do, and one keeps them for thirty days. Everything here runs in your browser.

• Image Text EditorReplace the text already in a picture, matched to its colour, size and weight, or add text of your own. Runs in your browser, so nothing is uploaded.
• Image CompressorCompress an image to a target size in KB, and see the quality it cost. Runs in your browser, so nothing is uploaded.
• Image ResizerSoonResize images to exact pixel dimensions or a percentage, with aspect ratio locking.
• Image CropperSoonCrop images to a freeform selection or a fixed ratio for avatars, thumbnails, and banners.
• JPG to PNG ConverterSoonConvert JPG images to PNG when you need lossless output or transparency support.

Convert between units, timestamps, and colour formats without hunting for the right formula.

• Unit ConverterSoonConvert length, weight, temperature, and volume between metric and imperial units.
• Timestamp ConverterSoonConvert Unix timestamps to human-readable dates and back, across time zones.
• Color ConverterSoonConvert colours between HEX, RGB, HSL, and OKLCH with a live preview of each value.

Straightforward calculators for everyday percentages, dates, and quantities — with the working shown.

• Percentage CalculatorSoonWork out percentages, percentage change, and reverse percentages with the formula shown.
• Age CalculatorSoonCalculate an exact age or the duration between two dates in years, months, and days.

Are SEO character counters accurate? Not when counting characters. Google truncates on pixel width, and 155 characters of prose is already too wide.

• Meta Description CheckerCount characters and measure the pixel width Google actually truncates on, with a preview of where your snippet gets cut.
• URL Slug GeneratorSoonTurn a title into a clean, readable URL slug with accents and punctuation handled correctly.
• Robots.txt GeneratorSoonBuild a valid robots.txt with the crawl rules you actually intend, and understand each line.