Free online tools
A growing set of fast, free, privacy-friendly tools that run entirely in your browser — nothing is uploaded and nothing is stored. Pick a tool below, or browse the unit converters and developer conversions.
Developer tools
JSON, encoding, hashing, timestamps and IDs — accurate, in-browser developer utilities.
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text instantly — runs entirely in your browser, nothing is uploaded.
DeveloperJSON Formatter & Validator
Format, validate and minify JSON in your browser. Pretty-print with 2/4-space or tab indent, catch errors with the exact line and column, then copy or download — nothing is uploaded.
DeveloperUnix Timestamp Converter
Convert a Unix timestamp (epoch) to a human date and back — seconds or milliseconds, UTC / ISO 8601 / local / relative output, with a live current-epoch clock. Runs in your browser.
DeveloperURL Encode / Decode
Percent-encode or decode URLs and URL components in your browser, with component vs full-URI mode and correct UTF-8 handling — nothing is uploaded.
DeveloperSHA Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text live, using the browser’s native Web Crypto API — accurate, private, nothing uploaded.
DeveloperUUID Generator
Generate RFC-compliant UUIDs — random (v4), time-ordered (v7), time-based (v1) and name-based (v5) — in bulk, with uppercase / no-hyphen / braces options and a UUID inspector. Runs entirely in your browser.
Text tools
Count, transform and compare text live as you type — no upload, no sign-up.
Word Counter
Count words, characters (with and without spaces), sentences, paragraphs and reading time live as you type. Includes platform character-limit bars for X, Instagram, LinkedIn and Meta descriptions.
TextCase Converter
Convert text between UPPER CASE, lower case, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case, SCREAMING_SNAKE_CASE and more — click any result to copy.
TextText Diff Checker
Compare two texts and instantly see what changed — added lines green, removed lines red, unchanged lines grey. Line-by-line diff using the LCS algorithm, runs in your browser. Nothing is uploaded.
More on Internet Tool Wizard
Every tool here works offline once loaded: the processing happens locally in your browser, so your text, JSON, hashes and IDs are never sent to a server.