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Konvertio — Free Developer Tools
135+ free online developer tools — JSON formatter, Base64 encoder, password generator, regex tester, UUID generator, and more. Instant, private, browser-based.
135+ tools5 categoriesNo server-side data processing
Quick access
Base64 Encoder / Decoder
Encode & decode Base64 strings
PopularJWT Decoder & Verifier
Decode & verify JWT tokens with signature check
PopularAES Encrypt / Decrypt
Encrypt & decrypt text with AES-256-GCM
PopularJSON Formatter
Format, validate & minify JSON
PopularDiff Checker
Compare two texts, highlight changes
PopularPassword Generator
Strong, random, secure passwords
PopularQR Code Generator
Generate QR codes from text or URLs
PopularToken / API Key Generator
Generate random tokens & API keys
PopularMore tools to explore
Browse categories →URL Encoder / Decoder
Encode & decode URL components
HTML Entity Encoder
Encode & decode HTML entities
Hash Generator
MD5, SHA-1, SHA-256 & SHA-512 hashes
Base64 Image Encoder
Convert images to Base64 data URIs
Base64 Image Decoder
Decode Base64 strings back into images
GZIP Compress / Decompress
Compress & decompress text with GZIP
Text Escape / Unescape
Escape & unescape JSON, HTML, URL, XML & more
Backslash Escape / Unescape
Escape & unescape backslash sequences per language