60 tools · no sign-up · no uploads
The developer tools you keep googling, in one fast place.
Format JSON, decode a JWT, generate an app icon set. Every tool runs entirely in your browser — your data never touches a server, because there isn't one.
Popular tools
- JSON Formatter Format, validate and minify JSON.
- UUID Generator Generate v4 and v7 UUIDs in bulk.
- Base64 Encoder / Decoder Encode and decode Base64, including URL-safe.
- JWT Decoder Inspect JWT headers, claims and expiry.
- App Icon Generator One image to every iOS, Android and web size.
- Password Generator Strong, random passwords from crypto.getRandomValues.
- QR Code Generator Text or URLs to a downloadable QR PNG.
- Time Zone Converter Compare times across zones, past or future.
Formatters
Pretty-print, minify and validate structured data.
- JSON Formatter Format, validate and minify JSON.
- Text Diff Compare two blocks of text line by line.
- YAML Formatter Validate, pretty-print and inspect YAML.
- SQL Formatter Beautify SQL across 12 dialects.
- Markdown Previewer Render GitHub-flavored Markdown live.
- CSS Formatter Beautify or minify CSS.
- JS / JSON5 Beautifier Format and minify JavaScript and JSON5.
- HTML Formatter / Minifier Format and compress HTML markup.
- XML Formatter Format XML and convert to JSON.
- JSON Diff Compare two JSON structures side by side.
Generators
Produce IDs, hashes, assets and other artifacts.
- UUID Generator Generate v4 and v7 UUIDs in bulk.
- Hash Generator SHA-1, SHA-256, SHA-384 and SHA-512 digests.
- Lorem Ipsum Generator Placeholder text in words, sentences or paragraphs.
- Password Generator Strong, random passwords from crypto.getRandomValues.
- QR Code Generator Text or URLs to a downloadable QR PNG.
- Cron Explainer Translate a cron expression to plain English.
- File Checksum SHA digests of any file, in-browser.
- ULID & Nano ID Generator Sortable ULIDs and compact Nano IDs.
- Cron Builder Point, click, get a cron expression.
- HMAC Generator Keyed hashes for webhook signatures.
- TOTP Generator 2FA codes from a Base32 secret.
- Slug Generator Titles to URL-safe slugs in bulk.
- Meta Tag Generator SEO and social <head> tags from a form.
- Barcode Generator CODE128, EAN-13, UPC and more.
- htpasswd Generator Basic-auth lines with bcrypt.
- RSA / EC Key Generator Generate RSA and EC key pairs in-browser.
- Bcrypt Generator Hash and verify passwords with bcrypt.
- Tailwind Palette Generator Generate a full Tailwind color scale from one hex.
Encoders & Decoders
Translate between encodings and inspect tokens.
- Base64 Encoder / Decoder Encode and decode Base64, including URL-safe.
- JWT Decoder Inspect JWT headers, claims and expiry.
- URL Encoder / Decoder Percent-encode URLs and parse query strings.
- Regex Tester Test regex with live matches and groups.
- HTML Entity Encoder Escape and unescape HTML entities.
- Unicode Inspector Code points, UTF-8 bytes and hidden characters.
- X.509 Certificate Decoder Inspect PEM or DER X.509 certificates.
- Data URI Decoder Decode Base64 and URI-encoded data URIs.
Converters
Move values between units, formats and representations.
- Timestamp Converter Unix time to dates, and back.
- Color Converter HEX, RGB, HSL and OKLCH in sync.
- Number Base Converter Binary, octal, decimal, hex and any radix.
- JSON → TypeScript Infer TypeScript interfaces from JSON.
- Case Converter camelCase, snake_case, kebab-case and more.
- JSON ↔ CSV Converter Turn JSON arrays into CSV, and back.
- Chmod Calculator Permissions to octal and back.
- TOML Converter TOML to JSON, YAML and back.
- List Converter Lines to CSV, JSON arrays and SQL IN lists.
- JSON → Zod & JSON Schema Infer Zod schemas and JSON Schema from JSON.
- Subnet Calculator CIDR to netmask, range and hosts.
- Time Zone Converter Compare times across zones, past or future.
- IPv6 Subnet Calculator IPv6 CIDR to network range and hosts.
- systemd Timer ↔ Cron Converter Convert between systemd OnCalendar and cron.
Images
Generate and transform image assets in the browser.
- App Icon Generator One image to every iOS, Android and web size.
- Image to Base64 Images to data URIs for embedding.
- SVG to PNG Rasterize SVG at any size.
- EXIF Viewer & Stripper See what your photos leak, then clean them.
- SVG Optimizer Shrink SVGs with SVGO, client-side.
- Image Resizer & Converter Resize images and switch format.
Reference
Quick lookups for codes, keys and content types.
Nothing leaves your browser
Every tool is client-side JavaScript. It makes no API calls, so what you paste is never uploaded, logged or measured.
Fast by construction
Static pages with a single interactive island each. Tools load instantly and work offline once cached.
No accounts, no limits
No sign-up wall, no rate limits, no “upgrade to unlock”. Bookmark the tool you use and get on with it.