Offline developer utilities
Dev Toolbox
Fast, local tools for encoding, security, and daily engineering workflows.
Tool Registry
Search by name, capability, or tag.
Productivity
Time management and focus
Cryptography
Encoding, hashing, and verification
Levenshtein Distance Calculator
Compare strings and compute edit distance.
Input: text pair | Output: distance
URI Encoder / Decoder
Encode or decode URI components safely.
Input: text | Output: URI
HTML Encoder / Decoder
Escape or decode HTML entities.
Input: text | Output: encoded HTML
Base64 Encoder / Decoder
Convert text or binary to base64 and back.
Input: text/file | Output: base64
MD5 Hasher
Generate MD5 hashes for strings or files.
Input: text/file | Output: hash
SHA1 Hasher
Compute SHA-1 digests.
Input: text/file | Output: hash
SHA256 Hasher
Compute SHA-256 digests.
Input: text/file | Output: hash
SHA512 Hasher
Compute SHA-512 digests.
Input: text/file | Output: hash
RIPEMD-160 Hasher
Compute RIPEMD-160 digests.
Input: text/file | Output: hash
JWT Helper
Validate tokens, import JWKs, and manage clock skew.
Input: JWT | Output: claims
Hash Verifier
Check hashes against known values.
Input: text/hash | Output: match
HMAC Generator
Generate HMAC signatures with SHA-256/SHA-512.
Input: text/key | Output: signature
SSH Key Fingerprint
Compute MD5 or SHA-256 fingerprints for SSH keys.
Input: public key | Output: fingerprint
TLS Certificate Decoder
Decode PEM certificates locally.
Input: PEM | Output: certificate data
Time
Dates, timestamps, and zones
Number
Bases, bits, and permissions
Change Base Helper
Convert numbers between bases.
Input: number/base | Output: converted
IPv4 Helper
Work with IPv4 addresses and CIDR.
Input: IPv4 | Output: analysis
Binary Helper
Convert and inspect binary values.
Input: number | Output: binary
Unix Permission Calculator
Translate chmod values to symbolic permissions.
Input: octal | Output: rwx
Graphics
Images, colors, and QR
Image Helper
Resize, compress, and convert images.
Input: image | Output: transformed image
Color Picker
Pick colors and copy values.
Output: color values
Color Shades Generator
Generate tints and shades for a palette.
Output: color scale
QR Code Generator + Reader
Create or scan QR codes.
Input: text/image | Output: QR
Color Contrast Checker
Check WCAG contrast ratios.
Input: colors | Output: contrast
Image Metadata Viewer
Read EXIF/IPTC metadata from images.
Input: image | Output: metadata
Network
Requests and API tooling
Misc
Grab bag utilities
ASCII Reference Table
Lookup ASCII codes and characters.
Output: table
Help me I'm stuck in Vim!
Quick exit cheatsheet for Vim.
Output: instructions
File Diff + Patch Viewer
Compare files and preview patch application.
Input: files | Output: diff
Lorem Ipsum Generator
Generate placeholder text blocks.
Output: text
JSON Formatter/Minifier + JSONPath
Format JSON, minify, and query with JSONPath.
Input: JSON | Output: formatted JSON
YAML ↔ JSON Converter
Convert YAML to JSON and back.
Input: YAML/JSON | Output: converted
CSV ↔ JSON Converter
Convert CSV to JSON and back.
Input: CSV/JSON | Output: converted
XML Formatter + XPath Tester
Format XML and evaluate XPath queries.
Input: XML | Output: formatted XML
UUID/ULID/KSUID Generator
Generate sortable and random IDs.
Output: identifiers
Regex Tester + Explainer
Test regex patterns and explain matches.
Input: regex/text | Output: matches
Text Case Converter + Slugify
Convert text case and generate slugs.
Input: text | Output: transformed text
Base-N Encoders
Encode data in Base32, Base58, or Base85.
Input: text | Output: encoded