Free Online Developer, Encoding & Security Tools
317+ tools — Runs 100% in your browser — your data never leaves your device.
Free online developer tools. No registration, no uploads.
Categories
Text Tools31Encoding Tools19Decoding Tools12Hash Tools13Cryptography Tools6JSON Tools12XML Tools4HTML Tools3CSS Tools5JavaScript Tools2Developer Tools16Network Tools6IP Tools6URL Tools4Timestamp Tools6Date & Time Tools7Number Tools10Binary Tools5Hex Tools2Regex Tools3Image Tools6File Tools6Compression Tools4Data Conversion Tools27Security Tools11UUID Tools5Color Tools9Web Tools10Unit Converters22Math & Statistics12Validators & Checksums11QR Code Tools22
Popular
Base64 EncoderEncode text, JSON, URLs or files to Base64, standard or URL-safe.URL EncoderPercent-encode URLs or single query components.Base64 DecoderDecode Base64 (standard or URL-safe) back to text or bytes.SHA-256 Hash GeneratorCompute the SHA-256 digest — the standard for modern integrity checks.AES EncryptPassword-based AES-GCM/CBC encryption using the Web Crypto API.JSON Formatter & BeautifierPretty-print JSON with configurable indentation.CSV to JSON ConverterTurn CSV (or any delimited file) into a JSON array.Cron Expression ParserExplain cron syntax and compute the next 10 run times.DNS LookupQuery A, AAAA, MX, TXT, NS, CNAME and SOA records over DNS-over-HTTPS.IPv4 Subnet / CIDR CalculatorNetwork address, broadcast, wildcard, mask and host range from any CIDR.Unix Timestamp ConverterConvert Unix time to human dates and back, in any timezone.Number Base ConverterConvert integers between bases 2–36.
Featured
Base64 EncoderEncode text, JSON, URLs or files to Base64, standard or URL-safe.JSON Formatter & BeautifierPretty-print JSON with configurable indentation.DNS LookupQuery A, AAAA, MX, TXT, NS, CNAME and SOA records over DNS-over-HTTPS.Unix Timestamp ConverterConvert Unix time to human dates and back, in any timezone.Regex TesterLive JavaScript regex testing with match groups highlighted.Strong Password GeneratorCrypto-random passwords with full policy control.JWT DecoderInspect JWT header, payload and signature metadata.UUID GeneratorRandom RFC 4122 v4 UUIDs, bulk generation included.
Recently Added
QR Code Scan TestRender your QR settings and then decode the result locally, comparing it to the original payload, plus quiet zone, contrast, density and capacity checks with a Good / Warning / Risk verdict.QR Payload FormatterBuild a correct standard payload string from JSON fields, applying the escaping rules each format requires.QR Payload ParserSplit a raw QR payload into its component fields — Wi-Fi SSID and encryption, vCard name and phone, geo coordinates, URI query parameters.QR Code ValidatorCheck a payload before you print it: capacity at the chosen error correction level, URL/email/Wi-Fi/vCard/geo/Bitcoin/Ethereum/UPI/JSON format, unsafe schemes and scannability risks.QR Payload Type DetectorIdentify what a decoded QR payload actually is — URL, Wi-Fi, vCard, MECARD, geo, calendar, email, phone, SMS, Bitcoin, Ethereum, UPI, WhatsApp, Telegram, JSON, XML or plain text — and split it into fields.QR Code DecoderUpload a PNG, JPG, WebP or GIF and decode the QR code locally with jsQR, then identify the payload type and parse its fields.JSON QR Code GeneratorValidate and minify JSON before encoding it, so the payload fits in the smallest possible QR version.UPI Payment QR Code GeneratorBuild a upi://pay QR code with payee VPA, name, amount, note and currency, validating the VPA and amount formats.Ethereum Payment QR Code GeneratorGenerate an EIP-681 ethereum: URI QR code with address, value and gas limit, validating the 0x + 40 hex format.Bitcoin Payment QR Code GeneratorBuild a BIP-21 bitcoin: URI QR code with address, amount, label and message, and check the address shape.Telegram QR Code GeneratorCreate a t.me link QR code that opens a Telegram chat or channel.WhatsApp QR Code GeneratorBuild a wa.me link QR code with an optional prefilled message, normalising the phone number to digits with country code.
Recently Added · SEO
Convert String To Pascalcase — Free Online Tool | PascalCase Converter 26173ToolsConvert Camelcase To Kebab Case — Free Online Tool | kebab-case Converter 26173ToolsConvert Camelcase To Snake Case — Free Online Tool | snake_case Converter 26173ToolsAes 256 Encrypt Text Online — Free Online Tool | AES Encrypt 26173ToolsDegrees To Radians — Free Online Tool | Angle Converter 26173ToolsDecode Base64 To String — Free Online Tool | Base64 Decoder 26173ToolsSha256 Hash Online — Free Online Tool | SHA-256 Hash Generator 26173ToolsGenerate Uuid Online — Free Online Tool | UUID Generator 26173Tools
Guides
JWT Anatomy: Header, Payload, Signature — and Why Decoding Is Not VerifyingCIDR and Subnet Masks Explained with Worked ExamplesJSON vs YAML vs TOML: Configuration Formats ComparedURL Encoding Rules: Reserved Characters and Percent-EncodingUUIDs Explained: v4 vs v7 vs ULID for Database KeysMD5 vs SHA-1 vs SHA-256: Choosing a Hash Function