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Developer tools, no clutter.

JSON, Base64, hashing, JWT, encoders and formatters. Instant, exact, and private — nothing leaves your browser.

19 live toolsUpdated weekly

All tools

New tools added every week
JSON
JSON Formatter
Free online JSON formatter and validator. Beautify, indent and validate JSON instantly in your browser.
B64
Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 to text online for free. UTF-8 safe, runs entirely in your browser.
URL
URL Encoder / Decoder
Percent-encode or decode URLs and query strings online for free. UTF-8 safe, runs entirely in your browser.
UUID
UUID Generator
Generate random version 4 UUIDs in bulk online for free. Copy or download them — generated locally in your browser.
HASH
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from text online for free. Fast, private, and runs entirely in your browser.
FCC
File Checksum Calculator
Free online file checksum calculator. Get the SHA-256, SHA-512, SHA-1, MD5 or CRC-32 of any file and check it against the published one — in your browser, nothing uploaded.
HG
HMAC Generator
Free HMAC generator. Sign a message with a secret key using HMAC-SHA256, SHA-1, SHA-384, SHA-512 or MD5, and check a webhook signature — all in your browser.
JWT
JWT Decoder
Decode JWT tokens online for free. Inspect the header, payload, issued and expiry times of any JSON Web Token — in your browser, nothing uploaded.
SQL
SQL Formatter
Format and beautify SQL queries online for free. Indent clauses, uppercase keywords and make messy SQL readable — instant and fully in your browser.
HTML
HTML Minifier
Minify HTML online for free. Collapse whitespace, strip comments and shrink markup to load faster — instant, private, and fully in your browser.
HB
HTML Beautifier
Free HTML beautifier. Indent messy or minified HTML without changing how the page renders — tags, attributes and text are copied exactly, in your browser.
XF
XML Formatter
Format XML online free — pretty-print or minify, with well-formedness checking. Keeps mixed content, entities and CDATA exactly as written, all in your browser.
QCG
QR Code Generator
Free QR code generator with no expiry and no scan limits. Codes for a link, Wi-Fi, UPI, email or phone, made in your browser and saved as PNG or SVG.
TC
Token Counter
Free LLM token counter. Count GPT-5, GPT-4o and GPT-4 tokens exactly with OpenAI's tiktoken tables — in your browser, nothing uploaded.
SE
String Escaper
Free string escaper and unescaper for JSON, JavaScript, HTML, XML, CSV, SQL, regex and shell. Escapes to the exact rules of each format, in your browser.
HEE
HTML Entity Encoder
Free HTML entity encoder and decoder. Convert & < > and any character to named, decimal or hex references, decode them back, and search the full entity table — in your browser.
CEG
Cron Expression Generator
Free cron expression generator and explainer. Translate any crontab, Quartz or 6-field schedule into plain English, see the next run times in any time zone, and build one from a dropdown.
ITB
Image to Base64
Convert an image to a Base64 data URI, or decode one back to a file. Get it as a data URI, CSS background, img tag or Markdown, with the real size cost measured. Free and fully in your browser.
JTT
JSON to TypeScript
Generate TypeScript interfaces from JSON online free. Reads every record, marks missing fields optional and null values nullable, and runs entirely in your browser.