Encoding & Developer Tools
Base64, URL encoding, JWT decoding, hash generation and UUIDs. The small developer utilities you reach for several times a week, all client-side.
Base64 Encoder & Decoder
Encode and decode Base64, including URL-safe and file input.
Open tool →URL Encoder & Decoder
Percent-encode and decode URLs and query parameters.
Open tool →JWT Decoder
Inspect a JSON Web Token's header, claims and expiry.
Open tool →Hash Generator
Generate cryptographic hashes for text or files.
Open tool →UUID Generator
Generate cryptographically random UUIDs in bulk.
Open tool →About Encoding & Developer Tools
These are the utilities that sit in a developer's muscle memory: decode this token, hash that string, encode a value so it survives a query parameter. Because they often involve secrets, every one of them runs entirely in your browser. Nothing you paste is transmitted anywhere.
Every tool in this category
- Base64 Encoder & Decoder — Encode and decode Base64, including URL-safe and file input.
- URL Encoder & Decoder — Percent-encode and decode URLs and query parameters.
- JWT Decoder — Inspect a JSON Web Token's header, claims and expiry.
- Hash Generator — Generate cryptographic hashes for text or files.
- UUID Generator — Generate cryptographically random UUIDs in bulk.
Other tool categories
- Data Format Converters — Convert between JSON, YAML, CSV, XML and TypeScript in your browser. Every converter validates as you type and nothing is uploaded to a server.
- AI & LLM Tools — Count tokens, estimate API costs, check context window limits and generate llms.txt. Practical utilities for anyone building on GPT, Claude or Gemini.
- SEO & Web Tools — Generate robots.txt, meta tags, schema markup and UTM links, preview your SERP snippet and validate an XML sitemap. Technical SEO essentials, free.
- Text & String Tools — Compare two texts, test regular expressions, build URL slugs, convert case and count words and characters. Fast, private, browser-based text utilities.
- Image & Asset Tools — Convert images to Base64 data URIs, inline SVGs, read EXIF metadata, generate favicons and extract colour palettes — all in the browser.