📝 Text & Data Tools

Beautify, minify and validate JSON in your browser, with error messages that point at the character that broke it rather than just saying invalid.

Encode text to Base64 or decode it back, with full Unicode support — and a clear explanation of why Base64 is not encryption.

Percent-encode text for use in a URL, or decode an encoded URL back to readable text, with separate handling for full URLs and individual parameters.

Convert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and kebab-case, with the naming conventions each one belongs to.

Count words, characters, sentences and paragraphs with an estimated reading time, plus the character limits for the places text usually has to fit.

Test regular expressions against your text in real time with live match highlighting, capture groups, and an explanation of what each part of the pattern does.

Test your typing speed and accuracy in words per minute with a timed test, and see how the standard WPM figure is actually calculated.

Turn any title into a clean URL-friendly slug, handling accents, punctuation and non-Latin script — with the reasons short, stable slugs matter.

Write Markdown and see the formatted result live, side by side, with a syntax reference and support for tables, code blocks and task lists.

Sort lines alphabetically or numerically, reverse them, shuffle them, or remove duplicates — with natural sort for text containing numbers.

Remove, find or count duplicate lines in a list, with options to ignore case, trim whitespace and keep either the first or last occurrence.

Convert JSON to YAML and YAML to JSON in your browser, with formatting, error checking, and the gotchas that make YAML trickier than it looks.

Beautify messy XML with clean indentation or minify it to one line, validated in your browser — with well-formed versus valid explained.

Encode text to HTML entities or decode entities back to plain text, covering the five characters that matter for safety and the many that matter for display.

Encode and decode Caesar-shift ciphers and ROT13, with a brute-force view of all 25 shifts — which is exactly why the cipher offers no real security.

Spell out any number in English words, including a cheque-writing format with the cents as a fraction, and handle the British and American differences.

Compare two blocks of text and highlight what was added, removed and changed, with word-level and character-level views for small edits.

Decode a JSON Web Token to inspect its header, payload and expiry in your browser — with a clear warning that decoding is not the same as verifying.

Beautify or minify HTML, CSS and JavaScript in one tool, with structural re-indenting and an honest account of what an automatic formatter can and cannot fix.

Turn code into a crisp share-card PNG with syntax highlighting, window chrome and line numbers — with a note on when not to use one.

Unwrap PDF and email text into clean paragraphs, strip every break, or join lines with a custom separator — with real paragraph detection.

Hard-wrap text at any column, prefix lines for email quoting or code comments, and convert straight quotes to typographic ones — for plain-text formatting.

Convert Markdown to HTML or HTML back to Markdown, with a live rendered preview and notes on where the flavours of Markdown disagree.

Lint a .env file for the classic silent bugs, then format, sort or blank it into an example file — entirely in your browser, because these files hold secrets.

Format messy SQL into readable indented clauses or minify it to one line, with keyword casing options and support for the common dialects.

Turn CSV data into a clean Markdown or HTML table with column alignment and a live preview, handling quoted fields and pipes that would break the table.

Sort, filter, dedupe, transpose and convert CSV data in one place, entirely in your browser, with proper handling of quoted fields and embedded commas.

Run JSONPath queries against a JSON document and see every match instantly, with the syntax reference and the implementation differences that cause surprises.

Turn sample JSON into TypeScript interfaces, Go structs or Python dataclasses, with sensible naming and nullable handling for uncertain fields.

Generate a JSON Schema from a sample document, or validate JSON against a schema, with readable explanations of exactly which rule failed and where.

Break text into code points, spot invisible and confusable characters, and generate escape sequences — for debugging text that looks right and behaves wrong.

Encode and decode classic ciphers — ROT13, Caesar, Vigenere, Atbash, rail fence and more — for puzzles, teaching and understanding why none of them are secure.

Score how hard your writing is to read with six standard readability formulas, and see which sentences are dragging the score down.

Strip HTML tags to get clean plain text, with options for decoding entities, preserving line breaks, and keeping link addresses rather than losing them.

Turn a curl command into JavaScript fetch, axios, Node.js or Python requests code, preserving headers, body and authentication.

Count word, character and phrase frequency in text with a ranked chart, stop-word filtering, and the caveats that make raw counts misleading.

Add numbering to each line of text or strip existing numbers back off, with control over the start value, padding, separator and whether blank lines count.

Test glob patterns against file paths and see the regular expression they become, covering the differences between shell globbing and library implementations.

Pull a table out of HTML and convert it to CSV, TSV, JSON or Markdown, keeping nested tables separate and showing where merged cells break the grid.

Strip whitespace from JSON to make it as small as possible, with optional key sorting and a byte-count comparison showing what you saved.

Compare two JSON documents and see exactly which keys were added, removed or changed, structurally rather than as lines of text.

Compare two semantic versions and sort a list into correct semver order, including the pre-release rules that trip up ordinary string sorting.

Find and replace text in bulk with optional regular expressions, whole-word matching and case sensitivity — with a preview before anything is changed.

Reverse text by characters, words or lines, or flip letters inside each word — handling the emoji and accents that naive reversal corrupts.

Clean up messy text by trimming lines, collapsing repeated spaces, removing blank lines and stripping the invisible characters that survive a copy and paste.

Repeat any text as many times as you like, with a separator, optional numbering and line breaks between copies — useful for test data and templates.

Upload two text files and see the differences highlighted line by line, entirely in your browser, with whitespace and case options for noisy comparisons.

Scan a QR code with your camera or from an image file and read its contents in your browser, with a look at the destination before you decide to follow it.

Encrypt and decrypt a message with a password using AES-GCM in your browser, with an honest account of what this does and does not protect you from.

Convert coordinates to a geohash and back, plus why cells alternate shape and why two points metres apart can share no prefix at all.

Convert between octal and symbolic permissions, plus why umask 022 gives 644 for a file and 755 for a directory — and why it is not subtraction.

Turn an uptime percentage into real downtime, plus why 99.9% means 43 minutes a month or 8.8 hours a year depending on nothing but the window.

Distance and bearing between two coordinates on both a sphere and the real ellipsoid, plus why the bearing home is not the reverse of the bearing out.

Find where a bearing and a distance take you, plus why holding that heading lands you 3,000 km from where the great circle would.

Work out a subnet’s range, mask and hosts, plus why “addresses minus two” returns zero at a /31 and minus one at a /32.

Turn any address range into the fewest CIDR blocks that cover it exactly, plus why trimming a /24’s two ends turns it into fourteen.

Expand or compress any IPv6 address to the RFC 5952 canonical form, plus the two compression rules that implementations get wrong.

Paste HTML and see where the outline breaks, plus why skipping down is a fault and jumping back up never was.

Decode any xn-- domain and see which characters are not what they look like, plus why mixed-script detection misses the dangerous case.

See how any language pluralises any number, plus why “n === 1 ? singular : plural” is wrong in most of them and why Russian treats 21 as singular.

Compare how locales write dates and numbers, plus why “1.234” means two different numbers and why a three-digit grouping regex is wrong.