What can I do with the Text Studio?

The Text Studio is an all-in-one browser-based text workspace that combines a full-featured code editor with developer utilities reachable from one toolbar plus a Ctrl/Cmd+K command palette. You can format and minify JSON, XML, HTML, and CSS; encode and decode Base64, URLs, and HTML entities; decode JWT tokens; generate SHA-256 hashes; create UUIDs and Lorem Ipsum placeholder text; sort, deduplicate, and trim lines; convert text case (UPPERCASE, lowercase, Title Case); find and replace with regex including case-sensitive, whole-word, and capture groups in a draggable floating panel; convert colors (HEX ↔ RGB ↔ HSL) and number bases (binary, octal, decimal, hex); convert Unix timestamps to human-readable dates; calculate sums over selected numeric rows like Excel; and work with multiple documents in tabs. Everything runs in your browser — no uploads, no account, no tracking of content.

Is my text sent to a server?

No. The Text Studio runs entirely in your browser — all 22+ tools process text client-side using JavaScript and WebAssembly. Your content is never uploaded, stored on a server, or logged. Formatting, encoding, hashing, validation, and every other transformation happens in memory on your device and is released the moment you close the tab. This means you can safely paste sensitive data such as API keys, tokens, internal logs, proprietary JSON payloads, medical text, legal drafts, or private notes without that content ever leaving your computer. A small privacy badge is displayed whenever local-only processing is active so you always know where your data is.

How do I format or minify JSON?

Paste JSON into the editor — when the language is detected as JSON, the Format primary button in the toolbar pretty-prints it with 2-space indentation and one property per line. You can also open the Format dropdown and pick JSON Format or JSON Minify explicitly, or press Ctrl/Cmd+K and search "JSON". Minify collapses the document to a single line with no whitespace — useful for embedding in URLs, cURL commands, or configuration files with strict size limits. The formatter validates JSON syntax and highlights the exact line and column of the first error when a document is malformed, so you can jump to the problem and fix it without scrolling through a long file.

How do I format or minify XML?

Paste an XML document and the editor auto-detects the language (or pick XML manually from the status-bar language picker). The Format primary button in the toolbar then indents elements, aligns attributes, and adds newlines between nodes; XML Minify in the Format dropdown strips all non-significant whitespace for production use. Both also live in the Ctrl/Cmd+K palette. For deeper checks, pick XML Validate from the Format dropdown to open a resizable right-side panel that validates the document against a pasted XSD schema and shows inline squiggle underlines on the exact elements or attributes that violate the schema, along with copy-ready error messages that name the failing rule.

Can I format HTML and CSS?

Yes. Pick HTML or CSS as the language (auto-detected from document content or file extension) and click the Format primary button in the toolbar for consistently indented, readable markup or stylesheet. Explicit HTML Format / HTML Minify / CSS Format / CSS Minify entries also live in the Format dropdown and the Ctrl/Cmd+K palette. The formatter understands modern HTML5, self-closing tags, script and style blocks, CSS grid and flexbox properties, CSS variables, media queries, nested selectors, and @-rules. Minify HTML removes comments, collapses whitespace, and shortens attributes safely; Minify CSS removes whitespace, comments, and the last semicolon in each block — ideal for production bundles or embedded style tags.

How does Base64 encode and decode work?

Base64 is a text-safe encoding used to transport binary or non-ASCII data through systems that only understand plain text — HTTP headers, email bodies, JSON strings, JWT payloads, and data URLs. Put the text in the editor, then pick Base64 Encode from the Encode dropdown (or press Ctrl/Cmd+K and type "base64") to convert it — full Unicode including emoji and non-Latin scripts is handled correctly via UTF-8. Pick Base64 Decode on a Base64 string to recover the original text. Invalid Base64 input is reported with a clear error so you can see immediately if the string was truncated, padded incorrectly, or used the URL-safe variant.

How do I encode and decode URLs?

URL encoding (percent-encoding) replaces characters that have special meaning in a URL — spaces, slashes, question marks, ampersands, non-ASCII characters — with percent-hex sequences so the string can be safely used in a URL path, query string, or form body. Pick URL Encode from the Encode dropdown (or Ctrl/Cmd+K "url") to produce the encoded form, or URL Decode to reverse it. The Text Studio uses the standard encodeURIComponent algorithm, which handles full Unicode correctly, so you can encode international URLs, OAuth redirect parameters, search queries with quotes, and API endpoints that accept arbitrary user input.

What is HTML entity encoding?

HTML entity encoding converts characters that have special meaning in HTML — , &, ", ' — into their entity equivalents (<, >, &, ", ') so the text can be embedded in HTML without being interpreted as markup. This is essential for preventing XSS vulnerabilities when rendering user-generated content, and for displaying code snippets or XML fragments inside documentation pages. Pick HTML Entity Encode from the Encode dropdown (or Ctrl/Cmd+K "html entity") to transform raw text into safe HTML, and HTML Entity Decode to recover the original text from an HTML-encoded string. Named entities, numeric entities (decimal and hex), and Unicode code points are all handled.

How do I decode a JWT token?

Paste a JWT (three dot-separated Base64URL segments — header.payload.signature) into the editor and pick JWT Decode from the Encode dropdown, or press Ctrl/Cmd+K and type "jwt". The tool splits the token, Base64URL-decodes the header and payload, and pretty-prints both as JSON. You can inspect the algorithm (alg), key ID (kid), audience (aud), subject (sub), issuer (iss), expiration (exp), and any custom claims. The signature is shown but not verified — JWT signature verification requires the signing key, which should never be pasted into a browser tool. Use this for debugging, not for authenticating tokens in production.

What hash algorithms are supported?

The Tools dropdown (and Ctrl/Cmd+K palette) exposes four SHA-family hashes via the browser's native SubtleCrypto API: SHA-1 (160-bit, legacy compatibility — not for security), SHA-256 (256-bit, the default — used in TLS, git content addressing, Bitcoin, and most modern integrity checks), SHA-384 (384-bit, common in higher-security TLS cipher suites), and SHA-512 (512-bit, used when long-term collision resistance is required). Hashes are computed client-side and your input never leaves the browser. Because hashes are one-way, they are useful for checksums, fingerprinting, content addressing, and cache keys. MD5 and HMAC are not yet supported — track #414 for the addition.

How do I sort, deduplicate, or trim lines?

Line-based tools live in the Tools dropdown (and in the Ctrl/Cmd+K palette) and are ideal for cleaning up lists, CSV rows, log files, email address lists, and import files. Sort Lines (A→Z) and Sort Lines (Z→A) reorder the document alphabetically in either direction. Remove Duplicate Lines deletes exact duplicates while preserving the first occurrence. Trim Lines removes leading and trailing whitespace from every line. All transformations are undoable — press Ctrl/Cmd+Z to revert, or Ctrl/Cmd+Shift+Z to redo.

How do I convert text case?

Case conversion transforms the current document into a target case style. The Tools dropdown (and the Ctrl/Cmd+K palette) offers three styles: UPPERCASE (all caps), lowercase (all lowercase), and Title Case (first letter of every word capitalized). Useful when normalizing headings, standardizing imported data, or quickly flattening case differences before a diff.

How do I find and replace text?

Press Ctrl/Cmd+F to open the find window, or Ctrl/Cmd+H to open find and replace — it is a floating, draggable panel that sits on top of the editor so your text stays in view. Drag the panel by its header to reposition, and press Esc to close. Search runs incrementally as you type: every match is highlighted with a soft background and the current match gets a stronger outline, with a live "N of M" counter in the panel. Enter jumps to the next match, Shift+Enter to the previous; the up and down arrows do the same. Toggles cover case-sensitive mode (Aa), whole-word matching (W), and full JavaScript regular expressions (.*) with capture groups — in the replace field, use $1, $2, etc. for captured groups, $& for the full match, and $$ for a literal dollar sign. Replace swaps the current match and moves to the next; Replace All substitutes everywhere in a single action that can be undone with Ctrl/Cmd+Z, and the panel reports how many replacements were made. This is faster than running sed or grep for quick one-off transformations on pasted text.

How do I generate UUIDs or Lorem Ipsum?

Pick Generate UUID from the Tools dropdown (or Ctrl/Cmd+K "uuid") to insert an RFC 4122 version 4 UUID generated with the browser's cryptographically secure random number generator — the same one used for TLS keys and Web Crypto. UUIDs are useful as primary keys, idempotency keys, correlation IDs, and session tokens. Pick Lorem Ipsum from the same dropdown to insert a standard Lorem Ipsum paragraph as placeholder text for mockups and layout prototyping.

How do I convert Unix timestamps?

Paste a Unix timestamp (seconds or milliseconds since 1970-01-01 UTC) and the tool shows the corresponding ISO 8601 date, RFC 2822 date, and locale-formatted date in your browser's time zone and in UTC. Conversely, enter a human-readable date and get the Unix timestamp in both seconds and milliseconds. The current timestamp is updated live every second for reference. This is useful for debugging API payloads with epoch timestamps, log files that use epoch time, JWT exp/iat claims, and database TIMESTAMP columns that store seconds-since-epoch.

How do I convert colors and number bases?

The Color Converter accepts HEX (#RRGGBB or #RGB), RGB/RGBA (rgb(r, g, b) or rgb(r g b / a)), HSL/HSLA, and named CSS colors, and outputs all formats side by side along with a live color swatch preview. Useful for converting Figma/Sketch values into CSS, Tailwind color tokens, or design system values. The Number Base Converter accepts a number in binary, octal, decimal, or hexadecimal and displays it in all four bases simultaneously — handy for debugging bitmasks, memory addresses, file permissions, and character codes.

How does SUM calculation on row selection work?

Select any group of lines in the editor that contain numbers — one number per line, or numbers within mixed text — and the status bar displays the SUM, AVG, MIN, MAX, and COUNT of those numbers, automatically, like Excel. Numbers are extracted using a locale-aware parser that understands thousands separators and decimal points. This is ideal for quick calculations over log data, CSV columns, financial figures pasted from a spreadsheet, line items in an invoice, or any tabular text where you need aggregate statistics without switching to a spreadsheet application.

Can I work with multiple documents at once?

Yes. The Text Studio supports a multi-tab interface — each tab holds a separate document with its own language, undo/redo history, and scroll position. Open a new tab with Ctrl/Cmd+N or by clicking the + on the tab bar; click the × on a tab to close it. Tabs are useful for comparing two documents without closing either, keeping reference material open alongside the document you are editing, running different tools on different content in parallel, or simply staying organized when multitasking across API payloads, log snippets, code samples, and notes.

Can I open and save files?

Yes. Click Open in the toolbar to load any UTF-8 text file from your device into a new tab. Click Save to download the current tab back to disk — the browser prompts for a filename. All file operations are local — nothing is uploaded to a server — so even large log files or configuration dumps can be edited safely.

How does language detection work?

When you paste or open content, the Text Studio inspects the first few hundred characters and file extension to detect the language: JSON (starts with { or [), XML (starts with ), CSS (has selectors and braces), YAML (indented key-value pairs), Markdown (has #, * bullets, or code fences), JavaScript/TypeScript (has keywords, arrow functions), and more. Detection enables automatic syntax highlighting and targeted tool actions (Format runs the right formatter). You can always override the detected language manually via the status bar — useful when a file has an unusual extension or the content could be interpreted as more than one language.

Why does my JSON formatter say "Unexpected token"?

JSON is strict — common reasons for parse errors are: trailing commas after the last property or array element (allowed in JavaScript, illegal in JSON), single quotes instead of double quotes around strings or keys, unquoted property names, comments (JSON doesn't support // or /* */), or copy-paste artifacts like smart quotes from a word processor. The formatter highlights the exact line and column of the first error so you can jump straight to the problem and fix it. Replace smart quotes with straight quotes and remove trailing commas, and most JSON loads cleanly.

Can I customize the JSON indentation width?

JSON Format uses 2-space indentation by default — the de facto standard for web APIs, package.json, and most JavaScript codebases. Indentation is not configurable in the current build. If you need 4-space indentation for a specific style guide, copy the formatted output and replace double-spaces with quad-spaces in your editor of choice — JSON parses identically with any whitespace, so the result is still valid JSON.

What's the difference between Encode and Decode in Base64?

Encode converts plain text into a Base64 string — useful for embedding binary or non-ASCII data in URLs, JSON, JWT payloads, or HTTP headers that only accept ASCII. Decode reverses the process, turning a Base64 string back into the original text. If you paste Base64 and click Encode, you'll double-encode it; if you paste plain text and click Decode, you'll get an error. The auto-detection of which direction you want is not yet a feature — pick the right action in the Encode dropdown.

Why is my Base64 string longer than the original text?

Base64 encodes every 3 bytes of input as 4 ASCII characters of output, so the encoded form is always ~33 % longer than the original. The trailing == or = padding makes the length a multiple of 4. This overhead is the cost of fitting binary data through text-only channels — it's why email attachments and inline data URLs are larger than the underlying file. If size matters, prefer raw binary transports (HTTP file upload) over Base64 embedding.

What's the difference between encodeURI and encodeURIComponent?

URL Encode in the Text Studio uses encodeURIComponent, which escapes every reserved URL character including / and :. encodeURI escapes fewer characters (it preserves /, :, ?, &, # because they have meaning in a complete URL). Use encodeURIComponent for individual query parameter values, path segments, and form fields. Use encodeURI for entire URLs where you want to keep the structure visible. The Text Studio targets the first case because it's the right choice for ~95 % of dev workflows.

How do I check if a JWT is expired?

Decode the JWT, then look at the exp claim in the payload — it's a Unix timestamp (seconds since 1970-01-01 UTC). If exp is in the past, the token is expired. The Unix Timestamp tool can convert exp to a human-readable date if you paste the seconds value. The Text Studio doesn't auto-flag expiry because the decoder is for inspection, not authentication — production code should verify expiry plus signature on the server.

Can I decode a JWT issued by a third-party service?

Yes — JWT header and payload are just Base64URL-encoded JSON, public by design. Anyone with the token can decode them. The signature, however, can only be verified with the issuer's secret key. The JWT Decode tool inspects header and payload (algorithm, issuer, audience, subject, expiry, custom claims) but does not verify the signature — that requires the key, which should never be pasted into a browser tool. Use this for debugging, never for authentication.

What's the difference between SHA-256 and MD5?

SHA-256 produces a 256-bit (64 hex char) digest and is cryptographically secure for content integrity, file fingerprinting, and password hashing (with a salt). MD5 produces a 128-bit (32 hex char) digest, was broken for collision resistance years ago, and should not be used for security. The Text Studio currently ships SHA-256 only. MD5, SHA-1, SHA-384, SHA-512, and HMAC variants are tracked separately and will be added; in the meantime, use SHA-256 for any integrity check or fingerprint where output size doesn't matter.

Are UUIDs from this tool cryptographically secure?

Yes. The UUID generator uses crypto.getRandomValues — the same browser API that powers TLS key generation and Web Crypto. The output is RFC 4122 version 4 (random), with 122 bits of entropy. The probability of two independently generated UUIDs colliding is roughly 1 in 2^122 — astronomically small. Safe to use as primary keys, idempotency keys, correlation IDs, session tokens, and any other unique-identifier role you would normally need a UUID for.

How does the SUM calculation handle negative numbers and decimals?

Select lines containing numbers; the status bar parses each line for numeric values and aggregates them. Negative numbers (with a leading minus sign) are correctly summed. Decimals using a period separator (3.14) work; decimals using a comma separator (3,14) work in locales where that's the convention because the parser is locale-aware. Mixed text and numbers are also supported — "Invoice 42 for $1,234.50" contributes 42 and 1234.50 to the running aggregate.

How do I switch between dark and light themes?

The status bar at the bottom of the editor has a sun/moon toggle on the right side. Click it to flip between the two themes. The choice is remembered across sessions via system preference matching (prefers-color-scheme) plus an explicit override stored in localStorage. The editor uses the GitHub Light theme in light mode and One Dark in dark mode, which preserve syntax highlighting at high contrast in both.

What's the maximum text size the editor can handle?

CodeMirror 6 (the editor engine) handles documents up to several million lines without slowing down — internal data structures use a piece tree that scales sublinearly with size. In practice, performance degrades around 100 MB of text on most laptops because the browser has to keep the document and tokenization state in memory. For most workflows (logs, CSVs up to 50 MB, multi-megabyte JSON), the editor is responsive.

Is the editor slow on very large JSON files?

Most operations stay fast: typing, selection, find and replace, sort, dedupe, trim. JSON Format is the slowest because it parses the entire document, sorts keys (if enabled), and re-stringifies — for a 50 MB JSON, that's a few seconds of work. If you only need to read the document, skip Format and rely on syntax highlighting. If you need to edit specific paths, copy the slice you care about into a new tab and edit there.

What keyboard shortcuts does the Text Studio support?

Ctrl/Cmd+N opens a new tab, Ctrl/Cmd+S saves the current tab, Ctrl/Cmd+Z undoes, Ctrl/Cmd+Y or Ctrl/Cmd+Shift+Z redoes, Ctrl/Cmd+F opens find, Ctrl/Cmd+H opens find and replace, Ctrl/Cmd+K opens the command palette to search every action, Esc closes panels and clears search highlights, and the standard CodeMirror editor shortcuts work inside the editor (Ctrl/Cmd+/ to toggle a comment, Ctrl/Cmd+D to add a cursor at the next match, etc.).

How do I jump to a specific line in the document?

Open the find panel with Ctrl/Cmd+F and type the line content you're looking for, or use the editor's built-in keyboard navigation: Ctrl/Cmd+End jumps to the end of the document, Ctrl/Cmd+Home to the start. A go-to-line dialog (Ctrl+G) is provided by CodeMirror's default commands and works inside the editor — type a line number, press Enter, and the cursor moves there with the line scrolled into view.

Can I open multiple files in tabs at the same time?

Yes. Click the + on the tab bar (or press Ctrl/Cmd+N) to open a new tab. Each tab keeps its own document, language, undo/redo history, and scroll position. Click a tab to switch; click the × on a tab to close it. Useful for comparing two payloads, keeping reference material open beside the current document, or running different tools on different content in parallel.

Does the command palette search inside FAQ entries?

No — Ctrl/Cmd+K opens the action palette, which searches the 30+ tools the toolbar exposes (JSON Format, Base64 Encode, Hash, UUID, etc.). It does not search this FAQ. Use your browser's Ctrl/Cmd+F on this page to find specific FAQ topics, or scroll the accordion.

What's the difference between Sort Lines (A→Z) and Sort Lines (Z→A)?

Sort Lines (A→Z) reorders lines alphabetically ascending — A first, Z last, lowercase letters after uppercase by default. Sort Lines (Z→A) reverses the order — Z first, A last. Both are case-sensitive in the current build. For numeric sorting (1, 2, 10 instead of 1, 10, 2), parse the column as numbers in a separate tool first; the line sort treats every character as a string.

Can I sort lines numerically?

Sort Lines (A→Z and Z→A) sorts alphabetically — "10" comes before "2" because '1' < '2'. Numeric line sort is not yet a feature. Workaround: zero-pad your numbers ("002", "010") before sorting, or copy the column into a spreadsheet for numeric sort there. Add a feature request via GitHub Issues if you want native numeric sort.

What does Formatted Paste do?

Formatted Paste (the toolbar button or Ctrl/Cmd+Shift+V) reads your clipboard, detects whether it's JSON / XML / HTML / CSS, runs the right formatter, and inserts the result with proper indentation. Useful when you copy a minified JSON response from a browser DevTools panel and want to read it without first pasting and then formatting. If the clipboard isn't a recognized language, Formatted Paste behaves like a normal paste.

Why does the editor sometimes have squiggly underlines?

Squiggly red underlines mark validation errors — currently supported by XML Validate (when an XSD schema is loaded in the right-side panel). Hover the squiggle to see the error message and copy it. Other languages have syntax highlighting but not in-line linting; format errors surface as toast messages with the line and column number when you click Format.

Does the Text Studio work in Firefox and Safari?

Yes — all tools are built on web standards (Web Crypto, fetch, Blob, structured clone) that work in modern Chrome, Firefox, Safari, and Edge. Some features like the floating Find & Replace panel rely on PointerEvents and CSS transforms which are universally supported. Safari on iOS handles the editor well; on iPad, the keyboard shortcuts work with a connected hardware keyboard. If you find a browser-specific bug, please open a GitHub issue.

Why is the editor showing different line numbers than my file?

The editor uses 1-based line numbering — line 1 is the first line. Some file formats (older C compilers, Lua) use 1-based; others (JavaScript stack traces) use 0-based. Errors from the formatter and XML validator are 1-based, matching the gutter. If your external tool reports 0-based numbers, add 1 when cross-referencing.

How do I report a bug or suggest a feature?

Use the Contact page at /contact with steps to reproduce, the input that triggered the problem, and the expected output. For feature requests, describe the use case — "I want to convert XML to JSON because…" — rather than the implementation, so the right solution can be designed. Bug reports that mention the affected tool (json-format, xml-validate, etc.) help us route them quickly.

How do I generate a QR code?

Pick QR Code Generator from the Tools dropdown, or press Ctrl/Cmd+K and type "qr". A floating panel opens with a content field, size selector (256, 512, 1024 px), error-correction picker (L / M / Q / H), and foreground / background colour pickers. The preview updates live as you type. Hit Download PNG for a raster image or Download SVG for a scalable vector. Everything runs locally — your QR payload never leaves the browser, which matters when the content is a private URL, a one-time token, or anything else you would not want a third-party generator to log.

When should I use PNG vs SVG for the QR output?

Use PNG when you need a fixed-size raster image — embedding in a slide, a Word document, an email signature, or a social-media post. Use SVG when you need to scale without quality loss — printing on a poster, etching onto packaging, or embedding in a vector design tool like Figma or Illustrator. SVG files are also smaller for plain black-and-white codes (a few KB vs hundreds of KB at 1024 px PNG).

What error-correction level should I pick for my QR code?

Higher levels make the code more resilient to damage (smudges, partial covering, low scanner quality) at the cost of slightly higher density. L (low ~7%) is fine for a clean digital screen; M (~15%) is the standard default for most use cases; Q (~25%) suits printed materials that may get scuffed; H (~30%) is best when the code will be partially covered by a logo or used in harsh outdoor environments. The Text Studio defaults to M.

Why does my QR code look strange when I change colours?

QR scanners need enough contrast between the foreground (the dark modules) and the background to read the pattern. Aim for a contrast ratio of at least 3:1; black on white is ideal. Light foreground on dark background works too — most modern scanners auto-detect inverted codes. Avoid pairs that are similar in luminance (e.g., dark-blue on dark-purple) because the scanner will fail to find the finder patterns.

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How It Works

Paste or Open

Paste text directly into the editor, drop a file onto the canvas, or click Open to load a local file from your computer. The Text Studio accepts plain text, code, JSON, XML, HTML, CSS, Markdown, YAML, JavaScript, CSV, logs, and any other UTF-8 content — there is no file type restriction and no upload: everything is loaded into the browser and never leaves your device.

Pick a Tool

Every action lives in the toolbar above the editor. The most-used ones (New, Open, Save, Undo, Redo, Formatted Paste, Format) are primary icon buttons. Everything else is grouped into three dropdowns — Format (JSON / XML / HTML / CSS · format + minify, XML Validate), Encode (Base64 / URL / HTML entity · encode + decode, JWT Decode), and Tools (Find & Replace, Sort, Case, Dedupe, Trim, Hash, UUID, Lorem Ipsum, Timestamp, Color Convert, Number Base). Prefer the keyboard? Press Ctrl/Cmd+K to open the command palette and search any of the 30+ actions by name.

Edit and Preview

The active tool runs on the current document or selected range. Results appear inline in the editor or in a resizable side panel (XML Validate, Diff). Multi-tab support lets you keep several documents open at once. Syntax highlighting auto-detects the language and the editor remembers your caret position, theme, and recently used tools between sessions.

Copy or Save

Copy the result with one click or save the file back to your disk in the original or a new format. Everything you do stays in your browser — there is no account required, no upload, no server roundtrip, and no telemetry on content. Close the tab and your text is gone from the site.

Tools inside the Text Editor

JSON Format & Minify

Pretty-print JSON with 2-space indentation or collapse to one line. Validates syntax with line/column error messages.

XML Format & Minify

Indent elements and align attributes, or strip non-significant whitespace for production.

XML Validate

Validate XML against a pasted XSD schema with inline error squiggles in a resizable side panel.

HTML Format & Minify

Format HTML5 with consistent indentation, or minify by removing comments and whitespace.

CSS Format & Minify

Format CSS with consistent indentation. Understands grid, flexbox, variables, media queries, and @-rules.

Base64 Encode & Decode

Encode text to Base64 or decode back. Full Unicode support including emoji and non-Latin scripts.

URL Encode & Decode

Percent-encode strings for safe use in URL paths, query strings, and form bodies via encodeURIComponent.

HTML Entity Encode & Decode

Convert <, >, &, ", ' to their HTML entities to prevent XSS and display markup safely in documentation.

JWT Decode

Decode header.payload.signature locally. Inspect alg, kid, aud, sub, iss, exp, and custom claims.

Hash (SHA-1, SHA-256, SHA-384, SHA-512)

Compute SHA-1, SHA-256, SHA-384, or SHA-512 hex digests using the browser SubtleCrypto API. Useful for checksums, fingerprinting, content addressing, and cache keys.

UUID Generator

Generate RFC 4122 v4 UUIDs using the cryptographically secure random number generator.

Lorem Ipsum

Insert a Lorem Ipsum paragraph as placeholder text for mockups and layout prototyping.

Find & Replace

Floating draggable panel with case-sensitive, whole-word, and regex modes including capture groups ($1, $2).

Sort Lines

Reorder lines alphabetically (A→Z or Z→A). Ideal for cleaning up CSV columns, lists, and import files.

Case Conversion

Transform the document into UPPERCASE, lowercase, or Title Case for normalizing headings or imported data.

Remove Duplicate Lines

Delete exact duplicate lines while preserving the first occurrence — useful for de-duping email or import lists.

Trim Lines

Strip leading and trailing whitespace from every line in the document.

Unix Timestamp

Convert between Unix timestamps and human-readable dates. Shows ISO 8601, RFC 2822, locale, UTC, and live now.

Color Convert

Convert between HEX, RGB/RGBA, HSL/HSLA, and named CSS colors with a live swatch preview.

Number Base

Convert numbers between binary, octal, decimal, and hexadecimal in one view. Handy for bitmasks and char codes.

QR Code Generator

Generate QR codes from any URL or text. Pick size, error-correction level, foreground / background colours; download as PNG or SVG.

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