Every tool you need.
One tab, no fuss.
Free utilities for developers and curious humans - formatters, generators, encoders, security helpers. Most run in your browser; the few that need a server (DNS, WHOIS, OCR, conversions) process data in memory and discard it. No accounts, no signup, no nonsense.
Featured tools
316 tools from our most-used - pick one and go.
Solar Irradiance and PV Yield (PVGIS)
Annual PV yield for any point on the map, straight from the EU Commission's PVGIS service.
Price Tag Generator
Bulk price tags with barcodes. A4-ready PDF, print and cut, no signup needed.
Full name
Generate an OpenPGP keypair (Ed25519 or RSA) right in your browser. Armored ASCII format, ready to import.
Image Color Picker
Pull the exact color from any photo. HEX, RGB, OKLCH plus a saved palette.
Barcode Generator
Create EAN-13, UPC, Code 128, ITF and more. No signup, print-ready output.
ERC-20 / Token Info Lookup
Paste a contract address, pick a chain, get name, symbol, decimals, and total supply straight from the blockchain.
BMI Calculator
Check your BMI against the WHO healthy weight range in seconds.
Savings calculator
See how compound interest grows your money over time. Doubles as an FD and EPF calculator.
EAN, UPC, GTIN Validator
Verify the check digit of a barcode or compute it if the last digit is missing.
2FA Backup Codes Generator
One-time recovery codes to sign in when you lose your 2FA phone.
Loan calculator
Get your monthly payment (EMI), total interest, and full amortization schedule in seconds.
Running Pace Calculator
Running pace, time or distance, with per-kilometer splits and race predictions.
UPS Runtime Calculator
How long will your UPS hold your gear on a power outage? Honest math with Peukert effect.
HTTP/2 + HTTP/3 + QUIC Detector
Find out whether a site speaks HTTP/2 and HTTP/3 (QUIC). ALPN negotiation, Alt-Svc header, server-push hints and Early-Hints, all in one view.
Age Calculator
Find your exact age down to the day, plus total days, hours and minutes alive.
sed / awk Helper
Pick an action, get a ready sed or awk command with a live preview of the result. Substitute, delete, print, columns, sums, filters, plus a cookbook of 20 recipes.
Browse by category
Pick a topic and see every tool in one place.
Encrypted notes
Send a secret message that self-destructs after one read. The encryption key never leaves your browser.
QR codes
QR code generators: link, Wi-Fi, vCard, email, SMS, text.
Passwords and auth
Password generator, breach check, hash, bcrypt, PIN, TOTP, JWT decoder.
Colors
HEX/RGB/HSL/OKLCH converter, mixers, palettes, contrast, color-blindness, gradients.
Loans & credit
Loan, refinance, mortgage, debt payoff and credit card payoff calculators.
JSON & schemas
JSON formatter, JSON↔YAML↔TOML, JSONPath, JSON Schema, JSON→TypeScript, XLSX→JSON.
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