Developer tools

Format JSON, decode JWTs, test regex, generate cron expressions, diff texts and convert data formats — free, instantly, entirely in your browser.

Format and validate JSONPretty-print, minify and validate JSON right in your browser. Live error messages, no sign-up, nothing ever sent to a server.

Decode a JWT tokenDecode JWT header and payload in your browser — base64url, exp status and algorithm shown live. Nothing is uploaded and signatures are never verified.

Test regular expressions liveTest regular expressions against live text in your browser: highlighted matches, capture groups, instant error messages. Free, nothing uploaded.

Cron expression generatorBuild standard 5-field cron expressions with presets and plain-English explanation. For crontab, GitHub Actions and CI schedulers. Free, in your browser.

Unix timestamp converterConvert Unix timestamps to dates and back — seconds or milliseconds, with ready-to-paste Discord timestamp markup. Free, runs in your browser.

Compare two texts line by lineCompare two texts or config files line by line in your browser — additions and removals highlighted live. Free, no sign-up, nothing uploaded.

Convert CSV to JSONPaste CSV, get clean JSON objects in your browser. Auto-detects comma, semicolon and tab separators and handles quoted fields — nothing is uploaded.

Convert JSON to CSVTurn JSON arrays into spreadsheet-ready CSV right in your browser. Choose comma, semicolon or tab output — proper quoting, nothing uploaded.

Convert YAML to JSONConvert YAML — GitHub Actions, Docker Compose, Kubernetes manifests — to JSON in your browser. Block scalars, flow collections and comments handled; nothing is uploaded.

Convert JSON to YAMLTurn JSON into clean block-style YAML in your browser — the readable form for docs, configs and code reviews. Nothing is uploaded.

Convert Excel to JSONDrop an .xlsx workbook and get JSON — every sheet, shared strings, real dates and sparse cells kept in place. Runs entirely in your browser.

Convert Excel to GSTR-1 JSONTurn an Excel invoice register into GSTR-1 JSON for the GSTN portal — B2B, B2CS and HSN summary, GSTIN checksum-checked, built in your browser.

Convert vCard (.vcf) to JSONConvert phone-exported .vcf contact files to clean JSON in your browser. Folded lines, quoted-printable and multi-values decoded — never uploaded.

Convert vCard (.vcf) to CSVConvert phone-exported .vcf contact files to CSV for Excel and CRM imports — one row per contact, Google-style Phone/Email columns, parsed in your browser.

Encode text to Base64Encode text to Base64 in your browser with correct UTF-8 handling and an optional URL-safe alphabet. Instant, offline-capable, nothing uploaded.

Decode Base64 to textDecode Base64 back to text in your browser. Whitespace and newlines ignored, UTF-8 handled correctly, clear errors on broken input — nothing uploaded.

Convert text to Unicode escapesConvert text to Unicode escape sequences in your browser — \uXXXX for JS and JSON, \u{...} for ES6, \UXXXXXXXX, compact \xXX. Printable ASCII can stay readable.

Convert emoji to Unicode code points Escape .properties files the native2ascii way Escape text with Python \u escapes

Decode Unicode escapes to textTurn \uXXXX, \u{...}, \UXXXXXXXX, \xXX and numeric character references back into readable text in your browser. Surrogate pairs handled — nothing uploaded.

Convert text to UTF-8 bytesSee the exact UTF-8 bytes behind any text — space-separated hex or decimal, in your browser. 中 becomes E4 B8 AD. Free, instant, nothing uploaded.

Decode UTF-8 bytes to text

Escape text to HTML entitiesEscape text for safe HTML output in your browser — & < > " ' become entities, with an option to armour every non-ASCII character as numeric references. Nothing uploaded.

Decode HTML entities to text

Remove emoji from textStrip every emoji from text in your browser — smileys, flags, keycaps and combined ZWJ sequences removed as whole units. Clean output, nothing uploaded.

Generate fancy textTurn any text into 𝐛𝐨𝐥𝐝, 𝑖𝑡𝑎𝑙𝑖𝑐, tiny, ⓑⓤⓑⓑⓛⓔ and 20 more Unicode styles — copy and paste into Instagram, Discord, Twitter and anywhere. Free, in your browser.

Generate bold Unicode text Generate small Unicode text Generate strikethrough text Generate upside-down text Generate mirror text Generate zalgo text

Copy invisible charactersOne click to copy an invisible character — zero width space, Hangul filler, Braille blank — for blank Discord names, empty messages and hidden separators. Free.

Repeat textRepeat any text N times with your choice of separator — new line, space or none — with honest limits so nothing freezes. Free, instant, in your browser.

Encode a URL or textPercent-encode text in your browser with the right mode: full URI, query-component or form encoding (+ for spaces). Instant and nothing uploaded.

Decode a URL or percent-encoded textTurn %XX percent-encoding back into readable text in your browser. Optional + as space for form values, honest errors on broken escapes — nothing uploaded.

Convert text caseConvert text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case and kebab-case — free, as you type, in your browser.

Convert UPPERCASE to lowercaseTurn ALL CAPS text into lowercase instantly — free, as you type, nothing uploaded. Fix caps-lock accidents, shouting emails and shouty headlines.

Convert lowercase to UPPERCASETurn lowercase text into ALL CAPS instantly — free, as you type, nothing uploaded. Headlines, constant names, shipping labels and form requirements.

Convert text to Title CaseCapitalize the first letter of every word — headlines, titles and names, converted as you type, free and entirely in your browser.

Convert text to Sentence caseRewrite any text in sentence case — first letter capitalised, the rest lower, new sentences and paragraphs handled. Free, as you type, in your browser.

The developer toolkit covers the chores between code: formatting and validating JSON, decoding JWTs, testing regex against live text, building cron expressions, converting CSV/YAML/Excel to and from JSON. Everything evaluates locally in your tab, so pasting production payloads, tokens or customer data is safe merely because there is nothing to paste into.

Every tool here is free and unlimited — Pro exists only for batch processing and oversized files.