Text and data tools that run entirely in the browser: diff and compare, format and validate, encode and decode, convert between formats — nothing is uploaded.
Working tools for people who handle text and data all day: compare two versions line by line, format and validate structured data, encode and decode, convert one format into another. Every tool processes the input on your own machine — large files never leave the browser — and shows exactly what it did, so the output can be trusted and checked. One task per page, no sign-in, no limits on size beyond what your browser can hold.
Compare two texts line by line, by word or by character: added, removed and unchanged counts, a similarity score and a unified diff — all in your browser.
You get: A side-by-side view of what changed between two versions with line numbers, the exact number of additions and removals, a similarity percentage, and a unified diff you can copy or download.
Open Text Diff & CompareEvery case at once: UPPER, lower, Title, Sentence, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case and more, with the rule each follows.
You get: Your text in thirteen cases side by side, each with a copy button and a one-line rule, so the programming and editorial forms are one paste away.
Open Case ConverterWords, characters with and without spaces, sentences, paragraphs, lines, unique words, reading and speaking time at the rate you set, most frequent words.
You get: Live counts as you type — words, characters, sentences, paragraphs — plus reading and speaking time from your own words-per-minute figure and a frequency table, all counted on your machine.
Open Word & Character CounterFormat, minify and validate JSON in the browser: errors with line and column and a plain hint, 2/4-space or tab indent, sorted keys, size and structure counts.
You get: Pretty-printed or minified JSON ready to copy or download, or the exact line and column of the first error with the reason — plus key, object, array and depth counts and a warning when a number would be rounded.
Open JSON Formatter & ValidatorEncode text to Base64 or decode Base64 to text in the browser: UTF-8 made explicit, standard or URL-safe alphabet, padding, MIME wrapping, errors with position.
You get: The Base64 string for any text (or the text for any Base64), byte and character counts, the alphabet and padding used, and — when the data is not text — a hex view instead of garbled characters.
Open Base64 Encode & DecodeDecode a JWT in the browser: header, payload and claims explained, exp/nbf/iat as UTC dates with expiry status; verify HS/RS/PS/ES signatures with your own key.
You get: The algorithm, the claims with their meaning and readable times, whether the token is valid, expired or not yet valid, and — with a secret or public key you keep on your machine — whether the signature checks out.
Open JWT Decoder & VerifierUnix epoch ↔ human date: seconds, milliseconds, microseconds or nanoseconds detected and stated; UTC, your zone and any IANA zone; ISO 8601, RFC 2822, ISO week.
You get: The date and time for any Unix timestamp (or the timestamp for any date) in UTC, your own zone and a zone you choose, with weekday, day of year, ISO week and how far from now — and the unit made explicit.
Open Unix Timestamp Converter