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Free Developer Tools

Format JSON, encode Base64, generate SHA-256 hashes, create UUIDs, and more. All developer tools run locally in your browser. Fast, free, and private.

No Uploads Lightning Fast 100% Free

All Free Developer Tools

{ }

JSON Formatter

Beautify and format JSON with syntax highlighting

json
✅

JSON Validator

Validate JSON syntax and report errors instantly

json
🔤

Base64 Encode

Encode text or files to Base64 in your browser

textbinary
🔓

Base64 Decode

Decode Base64 strings back to text or binary

base64
#

SHA-256 Generator

Generate SHA-256 hashes of text or files

textbinary
##

SHA-512 Generator

Generate SHA-512 hashes of text or files

textbinary
MD5

MD5 Generator

Generate MD5 checksums for text or files

textbinary
🆔

UUID Generator

Generate RFC-compliant UUIDs in bulk

text
🔗

URL Encoder

Percent-encode strings for safe URL inclusion

text
🔓

URL Decoder

Decode percent-encoded URLs and query strings

text

About FileCraft Free Developer Tools

FileCraft's developer toolkit is designed for engineers who need quick, reliable utilities without context-switching to a browser tab that phones home. Format and validate JSON, decode JWTs to inspect payloads, generate SHA-256 hashes for verification, encode and decode Base64 strings, create UUIDs for database records, or test regular expressions against real data — all from a clean interface with keyboard shortcuts and zero telemetry.

Common Use Cases

  • 1Format and syntax-check a JSON API response during development
  • 2Decode a JWT token to verify claims and expiry without a server call
  • 3Generate SHA-256 file hashes for integrity verification
  • 4Encode binary data or secrets to Base64 for HTTP headers
  • 5Create bulk UUIDs for seeding a test database

Technical Note

All tools run in a sandboxed browser context — no data ever reaches FileCraft's servers

Frequently Asked Questions

Are API keys or tokens I paste here ever transmitted?

No. Every developer tool runs fully in your browser with no network requests. Pasting a JWT, API key, or secret here is safe.

Can I use these tools offline?

Yes. Once the page loads, all developer tools work without an internet connection. They're ideal for air-gapped environments.

Does the JSON formatter support large files?

Yes. The formatter handles large JSON files (10MB+) without freezing by processing in a Web Worker thread.