All JustKit tools and articles
Every developer utility on JustKit - encoders, validators, formatters, generators.
Encode
- Base64 - Encode/decode Base64; URL-safe variant.
- HTML entities - Encode & to & or back; full named-entity table.
- Image to Base64 - Convert images to Base64 data URIs.
- JSON formatter - Format, validate and minify JSON; live errors with line/column.
- JWT decoder - Decode header and payload of a JSON Web Token.
- Markdown to HTML - Live preview Markdown as HTML.
- Regex tester - Live regex tester with match highlights.
- URL encode - percent-encode and decode URL components.
- YAML / JSON convert - Convert between YAML and JSON.
Generate
- Favicon generator - Convert text/emoji/image to all favicon sizes + manifest.
- Hash (SHA/MD5) - SHA-1/256/512 + MD5 hashing in your browser.
- Lorem ipsum - Generate placeholder text in paragraphs/words/list.
- Password strength tester - Estimate password strength (zxcvbn-style).
- Token / API key generator - Cryptographically secure random tokens.
- UUID generator - Generate v1, v4, v7 UUIDs in bulk.
Articles
- Base64 Explained
- Cidr Explained
- Jwt Explained
- Learn index - All editorial articles and explainers.
- Regex By Example
- Uuid Versions
About
Other
Color
- Color converter - Convert between HEX, RGB, HSL, OKLCH, etc.
- CSS gradient - Build linear/radial CSS gradients.
Compare
- Text diff - Side-by-side text diff with highlights.
Home
- Homepage - Site index.
Network
- CIDR / subnet - IPv4 subnet calculator: range, mask, broadcast.
- QR code generator - Generate QR codes for text or URLs.
Time
- Cron expression - Build and explain cron schedules in plain English.
- Unix timestamp - Convert Unix timestamps to dates and back.