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Toolbin, the Online Developer Toolbox
Toolbin brings together dozens of developer tools right in your browser: encoding, encryption, conversion, JSON formatting, network utilities, text, colors and much more. Nothing is sent to a server, everything runs locally for complete privacy. Free, no sign-up required, and available in English and French.
Encrypt and decrypt text with AES-GCM using a password, in your browser.
Generate API keys with a custom prefix (sk_live_, pk_…), cryptographically secure.
Generate a bcrypt hash of a password and verify a password against a hash, in your browser.
Encrypt and decrypt with the Caesar, ROT13 and Vigenère ciphers (educational).
Compute the CRC32 checksum of a text (hexadecimal).
Generate valid TEST card numbers per Luhn (Visa, Mastercard…), for development.
Encode and decode text to and from Base32 (RFC 4648) in your browser.
Encode and decode text in Base58 (Bitcoin, IPFS) right in your browser.
Encode and decode text to and from Base64 (UTF-8), right in your browser.
Convert text to binary (ASCII/UTF-8) and back.
Translate a cron expression into plain language (e.g. “every day at 9am”).
Convert CSV to JSON (array of objects) with header detection, in your browser.
Format, indent, minify and validate JSON. 100% client-side.
Minify JSON (strip whitespace and line breaks) to reduce its size.
Generate a TypeScript interface from a JSON object, including nested types.
Check whether your JSON is valid and pinpoint the first error precisely.
Convert Markdown to HTML with a live preview, in your browser.
Test a regular expression against text and inspect the matches.
Generate the HTTP Authorization: Basic header from a username and password.
Generate the HTTP Authorization: Bearer header and extract a token from a header.
Break down a Cookie or Set-Cookie header into readable key/value pairs.
Generate CORS headers (Access-Control-Allow-*) for your server.
Build a cron expression from simple options (frequency, minute, hour), in your browser.
Build a Content-Security-Policy header.
Compute Unix permissions (octal ↔ symbolic): read, write, execute.
Convert an IPv4 address range (start–end) into the minimal CIDR blocks.
Convert an IPv4 address to a decimal integer, binary and hexadecimal.
Calculate an IPv4 / CIDR subnet: mask, range, broadcast and host count.
Expand an IPv6 address to full form and compress it (::).
Look up a network port number and its associated service (common ports reference), in your browser.
Searchable ASCII reference table (decimal, hex, octal, character), in your browser.
Turn text into large ASCII letters (figlet banner style), right in your browser.
Bold the start of each word to read faster (bionic reading), in your browser.
Convert text to camelCase, snake_case, kebab-case, CONSTANT_CASE, and more.
Extract all email addresses from a text, deduplicated and sorted, in your browser.
Extract all URLs from a text, deduplicated and sorted, right in your browser.
Calculate an aspect ratio (16:9…) and derive a missing proportional dimension.
Generate a barcode (EAN-13, Code128, UPC) from a value, downloadable, in your browser.
Decode a data URI or Base64 into a viewable, downloadable image, in your browser.
Create CSS rounded corners (border-radius) with a live preview and copy-ready code.
Generate a CSS box-shadow with a live preview and copy-ready code.
Convert a color between HEX, RGB and HSL, with a live preview.
Validate a card number with the Luhn algorithm and detect the network.
Convert a CSV into SQL INSERT statements (custom table name), in your browser.
Check a CSV for consistency: constant column count and well-formed rows.
Check an email address format (syntax, domain) right in your browser.
Validate an IBAN with the mod-97 checksum and show the country code.
Check an .ics file structure: VCALENDAR, VEVENT and required fields.
Why Toolbin?
- ▸Total privacy: 100% in-browser, your data never leaves your device
- ▸Works offline once the page is loaded, no server dependency
- ▸Free and no sign-up: instant access to every tool
- ▸Bilingual English / French interface
- ▸A growing catalog: crypto, converters, formatters, network, text, color, validators, generators
Frequently asked questions
Which developer tools are available on Toolbin?
Toolbin offers tools organized into categories: crypto and security (hashing, Base64, JWT), converters, formatters and validators (JSON, XML), web and network utilities, text manipulation, colors and media, plus generators (UUID, passwords, keys).
Are Toolbin tools free?
Yes, all tools are completely free and unlimited. There is no subscription, no payment and no account needed.
Is my data safe with Toolbin?
Absolutely. Everything is processed locally in your browser, so your data is never sent to or stored on a server. Ideal for handling text, keys or sensitive information.
Do I need to sign up to use Toolbin?
No, no sign-up is required. Just open the page, pick a tool and start right away, with no account or email.