Free tools for developers and QA teams
30 tools, all client-side. No signup, no data sent anywhere. Everything runs in your browser.
Testing
10Random Address Generator
Realistic fake addresses from 45+ countries. Export to Playwright, Cypress, CSV, JSON, SQL.
Credit Card Generator
Luhn-valid test card numbers for Visa, MasterCard, Amex, Discover, JCB. CSV / JSON / Playwright.
Routing Number Generator
ABA-valid US routing numbers in bulk. 9 digits, valid checksum, ready for payment form tests.
IMEI Generator
Luhn-valid 15-digit IMEIs for QA. Form validation, device registry seeding, fixtures.
Fake Email Generator
Synthetic emails across public (Gmail, Outlook, Yahoo) and dev-safe domains. Bulk up to 100.
Fake Detail Generator
Full synthetic person profiles. Name, email, phone, address, DOB. JSON / CSV / SQL / Playwright export.
Random Letter Generator
Pick a letter A–Z or generate up to 100 at once. Export to CSV, JSON, JS array, Playwright.
Random Unicode Generator
Bulk Unicode characters from curated ranges. Latin, Greek, Cyrillic, symbols, emoji.
Reverse Text Generator
Transform text with 6 reversal modes. Reverse, words, upside-down, mirrored, and more.
UUID Generator
Bulk v4 (random) and v7 (time-ordered) UUIDs. RFC 9562, Web Crypto. Export to CSV, JSON, Playwright.
Development
19JSON Formatter
Format, validate, and minify JSON. Clean indentation, key sorting, and exact line/column errors.
JWT Decoder
Decode a JSON Web Token's header and payload. Readable claim timestamps and expiry status. Decode-only.
Text Compare
Side-by-side diff with line, word, and character granularity. Export as unified diff or .patch.
YAML Compare
Diff two YAML files. Normalize mode sorts keys so you only see real changes. Kubernetes, Helm, CI.
XML Compare
Diff two XML files with optional re-indentation. SOAP, RSS, sitemaps, Android layouts, POMs.
CSV Compare
Diff two CSV files. Normalize re-quotes cells so only real data changes show. ETL output, DB exports.
JSON Escape
Escape any string for embedding in JSON. Quotes, backslashes, newlines, control chars.
JSON Unescape
Decode JSON-escaped strings back to raw text. Reverses quotes, newlines, Unicode escapes.
Unstringify JSON
Decode a stringified JSON blob and pretty-print the inner document. Webhooks, log lines, double-encoding.
JSONPath Tester
Test JSONPath expressions against any JSON. Live evaluation, filter syntax, preset queries.
JSON to BSON
Serialize JSON to BSON. MongoDB's binary format. Hex, base64, byte count.
POJO to JSON
Java POJO class → JSON template with typed defaults. Seed API fixtures and Postman collections.
YAML Viewer
Parse, format, validate YAML. Optional alphabetical key sorting. Copy as JSON.
CSV Validator
Catch column drift, unterminated quoted cells, and stray quotes. RFC 4180 compliant.
PX to REM Converter
Convert between PX, REM, EM, %, PT. Real-time with adjustable base font size and code snippets.
Hex to Binary Converter
Convert hexadecimal to binary and back instantly. Real-time bidirectional with decimal values.
ASCII to Hex Converter
Convert ASCII text to hex and back. Real-time bidirectional with character count and byte size.
HTML Minifier
Minify HTML with 10+ options. Remove whitespace, comments, minify inline CSS/JS. Export to HTML, JS, JSX.
Image Size Finder
Pixel dimensions, aspect ratio, and file size of any image. Drop a file or paste a URL.
Need something else? support@bug0.com.
Test data is step one. Automate the rest.
A forward-deployed engineer builds your end-to-end tests on Bug0's AI engine; they auto-heal when your UI changes and run on every deploy. The engineer reviews every failure.
From $2,500/mo. Results in 7 days.