All Tools
46 free tools across 6 categories — no sign-up required.
String Tools
Case conversion, encoding, find & replace, word counting and text generation.
- Case ConverterConvert text between camelCase, PascalCase, snake_case, kebab-case and more.
- Find & ReplaceFind and replace text with plain string or regex mode.
- Base64 EncoderEncode text or file content to Base64.
- Base64 DecoderDecode Base64 back to readable text.
- URL EncoderPercent-encode a URL or query string.
- URL DecoderDecode a percent-encoded URL back to plain text.
- Word CounterCount words, characters, sentences and paragraphs in any text.
- Lorem Ipsum GeneratorGenerate placeholder Lorem Ipsum text for designs and prototypes.
- Diff CheckerCompare two blocks of text side-by-side and highlight differences.
Number Conversion
Convert between binary, octal, decimal, hexadecimal and ASCII.
- Binary ConverterConvert binary to decimal, hexadecimal, octal and ASCII.
- Octal ConverterConvert octal to binary, decimal, hex and ASCII.
- Decimal ConverterConvert decimal to binary, octal, hex and ASCII.
- Hex ConverterConvert hexadecimal to binary, octal, decimal and ASCII.
- ASCII / String ConverterConvert ASCII strings to and from all number bases.
- Bitwise CalculatorPerform AND, OR, XOR, NOT and bit shift operations.
- Bit Length CalculatorDetermine how many bits are needed to represent a number.
Cryptography
Hash generators, key pair generation, encryption and password utilities.
- SHA Hash GeneratorGenerate SHA-1, SHA-256, SHA-384 and SHA-512 hashes.
- MD5 Hash GeneratorGenerate MD5 hashes for checksums and legacy use cases.
- HMAC GeneratorGenerate HMAC signatures using SHA-256 or SHA-512.
- RSA Key Pair GeneratorGenerate 1024, 2048 or 4096-bit RSA public/private key pairs.
- AES Encrypt / DecryptEncrypt and decrypt text using AES-256-CBC.
- Password GeneratorGenerate secure, configurable random passwords.
- Hash IdentifierIdentify the type of an unknown hash by its format and length.
Generators
UUID, QR codes, colour codes, timestamps and CRON expressions.
- UUID GeneratorGenerate UUID v1, v4 and v5 — single or in bulk.
- QR Code GeneratorGenerate a downloadable QR code from any text or URL.
- Colour Code ConverterConvert colours between HEX, RGB, HSL and HSV formats.
- Timestamp ConverterConvert Unix timestamps to human-readable dates and back.
- CRON Expression BuilderBuild and explain CRON schedule expressions visually.
Web & Dev
JSON formatter, JWT decoder, regex tester and HTML entity tools.
- JSON Formatter & ValidatorValidate, format and minify JSON — with syntax error highlighting.
- JWT DecoderDecode and inspect JWT token headers, payloads and signatures.
- Regex TesterTest regular expressions live with match and group highlighting.
- HTML Entity EncoderEncode and decode HTML entities for safe use in markup.
- HTTP Status CodesReference list of all HTTP status codes with explanations.
- CSS Specificity CalculatorCalculate and compare the specificity of CSS selectors.
Electronics
Ohm's law, voltage dividers, resistor codes, LED and PCB calculators.
- Ohm's Law CalculatorSolve for voltage, current, resistance or power given any two values.
- Voltage Divider CalculatorCalculate output voltage from two resistors and an input voltage.
- Current Divider CalculatorCalculate branch currents through parallel resistors.
- Resistor Colour Code DecoderDecode 4, 5 and 6-band resistor colour codes to resistance values.
- LED Resistor CalculatorCalculate the correct series resistor value for an LED circuit.
- Capacitor Charge CalculatorCalculate RC circuit charge and discharge times.
- PCB Trace Width CalculatorCalculate minimum PCB trace width for a given current (IPC-2221).
- Frequency / Period ConverterConvert between frequency (Hz, kHz, MHz, GHz) and period.
- dB (Decibel) CalculatorCalculate power and voltage gain or loss in decibels.
- ADC CalculatorCalculate ADC LSB size, scaling factor and max voltage. Chip presets for Arduino, ESP32, ADS1115 and more.
- DAC CalculatorCalculate DAC output voltage and LSB size from resolution, Vref and output code.
- Wye ↔ Delta CalculatorConvert resistor networks between Wye (Y / star) and Delta (Δ / triangle) configurations.