Technology cluster
Developer Tools & Converters
Encoders, decoders, format converters, and generators for developers: base64, hex, JSON, hashes, ciphers, UUIDs, plus API and software cost calculators.
Top calculators
A short starting set for the most common developer tools & converters workflows.
XML Formatter & Validator - Pretty Print and Check XML
Format, pretty print, and validate XML online in your browser. Indent messy XML, check well‑formedness, see parser error messages, and debug XML safely with...
NATO Phonetic Alphabet Converter - Text ↔ Code Words
Interactive NATO phonetic alphabet converter. Turn text into NATO code words and decode NATO words back to plain text for radio, aviation, and clear spelling.
Braille Translator - Text to Braille and Braille to Text Converter
Convert plain text to Unicode Braille and decode Braille back to text with this browser-based Braille translator. Learn how Braille cells, capital signs, number signs, punctuation, and Unicode patterns work.
Data Storage Converter: Bits, Bytes, KB, MB, GB & More
Convert data storage units between bits, bytes, KB, MB, GB, TB and their binary counterparts (KiB, MiB, GiB, TiB) with clear formulas, tables, and worked exa...
Keyboard Keycode Viewer (JavaScript Keyboard Event Inspector)
Press any key to instantly inspect JavaScript KeyboardEvent values such as event.key, event.code, and legacy event.keyCode. Includes copy-to-clipboard help, worked examples, and an optional mini-game.
.gitignore Builder Tool - Create Custom Ignore Files
Generate tailored.gitignore files for your projects by selecting common templates and combining them with ease.
Audio Spectrum Analyzer and Recorder | Real-Time Microphone Frequency Visualizer
Use this browser-based audio spectrum analyzer and recorder to view your microphone frequency spectrum in real time, understand FFT-style visualization, and download a short 5-second recording.
Barcode Generator Tool - Create UPC-A, EAN-13, and Code-128 Barcodes
Generate UPC-A, EAN-13, and Code-128 barcodes directly in your browser. Enter your data, choose a barcode type, preview the result, and download a printable PNG for labels, inventory, and shipping.
All calculators in this cluster
Browse 19 calculators matched to this topic, or return to the Technology category.
.gitignore Builder Tool - Create Custom Ignore Files
Generate tailored.gitignore files for your projects by selecting common templates and combining them with ease.
API Rate Limit Planner - Avoid Throttling with Smart Scheduling
Plan your request schedule based on provider rate limits. Calculate optimal delay and time to complete large batches.
API Security Risk Estimator - Assess Exposure
Estimate potential API security risk based on endpoint count, data sensitivity, and authentication strength.
API Usage Cost Calculator - Estimate Monthly API Request Expenses
Estimate monthly and multi-month API expenses from price per 1,000 requests, daily request volume, active days, and growth rate. Use this calculator to forecast API bills and compare usage scenarios.
Audio Spectrum Analyzer and Recorder | Real-Time Microphone Frequency Visualizer
Use this browser-based audio spectrum analyzer and recorder to view your microphone frequency spectrum in real time, understand FFT-style visualization, and download a short 5-second recording.
Barcode Generator Tool - Create UPC-A, EAN-13, and Code-128 Barcodes
Generate UPC-A, EAN-13, and Code-128 barcodes directly in your browser. Enter your data, choose a barcode type, preview the result, and download a printable PNG for labels, inventory, and shipping.
Base-N Number Converter (Bases 2–36)
Convert integers between bases 2 and 36 with an in-browser base-N number converter. Learn positional notation, review formulas and examples, and practice with an optional radix mini-game.
Braille Translator - Text to Braille and Braille to Text Converter
Convert plain text to Unicode Braille and decode Braille back to text with this browser-based Braille translator. Learn how Braille cells, capital signs, number signs, punctuation, and Unicode patterns work.
Bug Fix Priority Score Calculator – Data-Driven Issue Triage for En...
Calculate a bug fix priority score using severity, affected users, and estimated effort. Help engineering managers, product owners, and QA teams decide which...
Data Storage Converter: Bits, Bytes, KB, MB, GB & More
Convert data storage units between bits, bytes, KB, MB, GB, TB and their binary counterparts (KiB, MiB, GiB, TiB) with clear formulas, tables, and worked exa...
Hash Collision Probability Calculator - Estimate Risks in Cryptographic Hashing
Enter the number of hashes you plan to generate and the bit size of the hash to approximate the probability of a collision using the birthday bound.
International Clothing Size Converter - US, UK, EU
Convert chest and waist measurements into US, UK, and EU clothing sizes with letter equivalents.
Keyboard Keycode Viewer (JavaScript Keyboard Event Inspector)
Press any key to instantly inspect JavaScript KeyboardEvent values such as event.key, event.code, and legacy event.keyCode. Includes copy-to-clipboard help, worked examples, and an optional mini-game.
Lottery Number Generator - Random Picks for Popular Games
Create random lottery ticket numbers for Powerball, Mega Millions, and EuroMillions. Learn about odds, combinations, and responsible play.
NATO Phonetic Alphabet Converter - Text ↔ Code Words
Interactive NATO phonetic alphabet converter. Turn text into NATO code words and decode NATO words back to plain text for radio, aviation, and clear spelling.
Open Source License Compatibility Calculator - Check Project and Dependency Licenses
Determine whether two open source licenses can be combined in the same project using a simplified compatibility matrix.
Shoe Size Converter - US, UK, EU, and Japan Size Chart
Convert shoe sizes between US, UK, EU, and Japan measurements. Enter a known size to see the nearest international equivalent and learn how shoe sizing charts actually work.
Torque Converter Efficiency Calculator | Slip, Speed Ratio & Lock-Up
Estimate torque converter efficiency from engine RPM, turbine/output RPM, and slip percentage. Compare implied slip, see how lock-up changes the estimate, and review the limits of the calculator.
XML Formatter & Validator - Pretty Print and Check XML
Format, pretty print, and validate XML online in your browser. Indent messy XML, check well‑formedness, see parser error messages, and debug XML safely with...