myFree Developer Tools
24 calculators
Free online developer tools covering JSON formatting and validation, Base64 encoding, regex testing, JWT decoding, UUID generation, QR code creation, hash generation (MD5, SHA), SQL formatting, URL encoding, cron builder and more. 24 tools that every developer should have bookmarked.
Base64 Encode / Decode
Encode text to Base64 or decode Base64 strings.
Cron Expression Builder
Build cron schedules visually — see plain-English translation.
CSV to JSON
Convert CSV files to JSON arrays with one click.
CSV to Table
Drop a CSV file or paste data — renders as a sortable table.
Hash Generator
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes.
HTML Minifier
Strip comments and collapse whitespace from HTML.
HTML to Markdown
Convert HTML snippets to clean Markdown.
Image to Base64
Convert images to Base64 data URIs for embedding.
JS & CSS Minifier
Remove whitespace and comments from JS and CSS.
JSON Formatter
Prettify, minify and validate JSON with error highlighting.
JSON to CSV
Paste a JSON array, preview as a table and download as CSV.
JSON ↔ YAML
Convert between JSON and YAML formats.
JWT Decoder
Decode any JWT — view header, payload and expiry.
Password Generator
Generate strong, cryptographically secure passwords.
PHP Unserializer
Decode PHP serialized strings, JSON and Base64.
Privacy Blur
Draw blur or black-box redactions over sensitive image areas.
QR Code Generator
Generate QR codes for URLs, text or contact cards.
Regex Tester
Write a pattern, test it against text — matches highlighted live.
SQL Formatter
Format messy SQL into readable, indented queries.
Timestamp Converter
Convert Unix timestamps to readable dates and back.
URL Encoder / Decoder
Encode special characters for URLs or decode them.
URL Slug Generator
Convert any title or text to a clean URL-safe slug.
UUID Generator
Generate cryptographically random UUID v4 identifiers.
XML Formatter
Pretty-print and validate XML with syntax highlighting.
Browse other categories