often.cloud

Encode or decode text with UTF-8 safe Base64.

Percent-encode strings or decode them back.

Encode text as HTML entities or decode them back. Supports named, decimal, and hex formats.

Encode text to binary, hex, or octal byte values — and decode back. Handles full UTF-8.

Convert text to Unicode codepoints (U+XXXX, \uXXXX, &#xHH;, or decimal) and back. Surrogate-pair safe with per-character breakdown.

Convert integers between any bases from 2 to 36 — binary, octal, decimal, hex, and custom. Arbitrary precision via BigInt.

Convert between integers and Roman numerals (1–3999) with a per-symbol breakdown.

Encode any file to base64 or decode base64 back to a file. Auto-detects file type, previews images, and outputs data URIs ready to embed.

Generate an HTTP Basic Authorization header from a username and password.

Pretty-print, minify, and validate JSON.

Inspect a JSON Web Token's header and payload.

Flatten an array of objects (or a single object) to CSV with custom delimiter.

Round-trip JSON into YAML with 2-space indent.

Parse YAML and emit pretty JSON.

Parse YAML, show as a collapsible tree, and offer the JSON equivalent.

Convert JSON to TOML, supporting tables and arrays.

Parse TOML and emit pretty JSON.

Parse TOML and re-emit as YAML.

Parse YAML and re-emit as TOML.

Pretty-print or minify XML, with validation via DOMParser.

Convert XML to JSON; attributes are prefixed with @ and text with #text.

Emit XML from a JSON tree (use @attr keys for attributes, #text for body).

Render GitHub-flavored Markdown with a live HTML preview.

Pretty-print SQL for MySQL, Postgres, SQLite, BigQuery, Snowflake, and more.

Compare two JSON values structurally and list added, removed, and changed paths.

Rich-text editor backed by contenteditable. Edit, get clean HTML out.

Generate v4 UUIDs in batches.

Strong random passwords with configurable charset.

Placeholder text by paragraphs, sentences, or words.

Generate a RFC 4193 Unique Local Address (fd00::/8) with random Global ID.

Random MAC addresses with separator, case, unicast, and local-admin options.

Pick a random TCP/UDP port from ephemeral, registered, or unrestricted ranges.

Sortable 128-bit identifiers (timestamp + randomness, Crockford Base32).

Generate a sized SVG placeholder image with custom colors and label.

Random tokens in base62, URL-safe, hex, or digits with an optional prefix.

Generate a QR code with custom size, error correction, and colors. Download SVG or PNG.

Generate a Wi-Fi QR code that auto-connects iOS and Android devices.

Fill a form → ready-to-paste <title>, Open Graph, Twitter, and theme-color meta tags.

Compute SHA-1, SHA-256, SHA-384, or SHA-512 digests.

Sign a message with HMAC-SHA-1/256/384/512. Output as hex or base64.

Password-encrypt text with AES-256-GCM + PBKDF2. Symmetric, in your browser.

Compute a Google-Authenticator-compatible TOTP code from a Base32 secret.

Generate an RSA key pair (2048/3072/4096) and export both keys as PEM.

Estimate password entropy and brute-force time; flag common, repeated, and sequence patterns.

Hash a password with bcrypt and verify against an existing hash.

Picker + hex, RGB, HSL, HSV, HWB, CMYK, OKLCh, CSS names, WCAG contrast.

Test a JavaScript regex against a string with live matches.

Extract the real URL from Microsoft SafeLinks and ProofPoint URLDefense wrapped links — all decoding happens in your browser.

Break a URL into protocol, host, port, path, search params, and hash.

Canonicalize an address by stripping +tags and (for Gmail) dots.

Searchable reference for every HTTP status code in the IANA registry.

Searchable reference for common file extensions and their IANA media types.

Round-trip IPv4 between dotted decimal, decimal, hex, and binary.

CIDR → network, broadcast, mask, wildcard, usable range, and class.

Expand a CIDR or A.B.C.D – W.X.Y.Z range into every address in between.

Translate Unix file permissions between octal and rwx symbolic.

Validate an IBAN against the ISO 13616 registry and break it into country and BBAN.

Parse a UA string into browser, engine, OS, device, and CPU details.

Translate a `docker run …` command into a docker-compose service block.

Searchable reference for JavaScript regular expressions.

Searchable reference for everyday git commands.

Press any key to see its `key`, `code`, modifier flags, and legacy keyCode.

Read everything the browser exposes: UA, viewport, cores, memory, network, locale.

Look up the vendor for an OUI prefix from a curated subset of the IEEE registry.

Normalize to E.164 and detect the country from the ITU-T country code.

Convert between epoch seconds/ms and ISO dates.

Convert between Celsius, Fahrenheit, Kelvin, and Rankine.

X% of Y · X is what % of Y · % change from old to new.

Stopwatch with start/stop, lap, and reset.

Given a start time and progress, estimate when work will finish.

Paste timings (one series per line) → mean, median, σ, min, max, p95.

Build a cron expression with presets and see a human-readable description.

Evaluate math expressions with functions (sin, log, sqrt…) and constants (pi, e).

Convert text between camel, snake, kebab, and more.

Mask a string's middle characters while keeping a visible prefix and suffix. Useful for safely displaying passwords, tokens, or emails.

Convert text to NATO phonetic words (Alpha, Bravo, Charlie…). Includes digit pronunciation and aviation variants.

Turn any string into a URL-safe slug. Configurable separator, lowercase, strict ASCII.

Abbreviate long words with first+count+last (internationalization → i18n).

Sort, dedupe, reverse, trim, and rejoin a list of lines with any separator.

Counts (chars, words, sentences, lines, bytes) + reading and speaking time.

Line-by-line diff with unified or side-by-side view and add/remove counts.

Render text as a chunky ASCII banner with block, dot, or star fills.

Searchable emoji grid — click to copy. Curated ~150 most-used emojis.