Free online developer tools that keep your data private
Format JSON, decode JWTs, hash files, merge PDFs, build IAM policies, and more. SnapUtilsPro runs locally in your browser — your files and text never upload to our servers.
- 250+
- Developer tools
- 17
- Categories
- 0
- Server uploads
- 100%
- Client-side
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Best free online developer tools
Popular privacy-first utilities — keyword-rich picks for everyday coding work.
Free JSON Formatter online
Format, validate, minify, and sort JSON in your browser. Privacy-first — nothing leaves your device.
Free Diff Checker online
Online code compare and difference checker with side-by-side additions and deletions.
Free Swagger / OpenAPI Editor online
Free Swagger editor and OpenAPI 3.0 editor — edit and validate API specs in your browser.
Free JWT Decoder online
Decode JWT header and payload, inspect claims and expiry. Decode only — no verification or cracking.
Free Hash Generator online
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes using Web Crypto in your browser.
Free Base64 Encoder / Decoder online
Encode and decode Base64 for text, URLs, and images entirely client-side.
Simple workflow
How SnapUtilsPro works
Pick from encoding, security, PDF, cloud IAM, and API utilities — no account wall.
JavaScript in your browser formats, hashes, merges, or converts. Heavy libraries load only when you open that tool.
Take results back to your editor or download files. Close the tab and the data is gone from our site.
Trust & privacy built in
Static site. Client-side processing. No account required. Your payloads stay on your device.
Full catalog
All developer tools
Search by keyword or filter by category. Popular picks: JSON formatter, code compare / diff checker, Swagger editor, JWT decoder, and API tester.
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From the blog
About our privacy model
SnapUtilsPro is a static site. File and text processing for these tools happens in your browser with client-side libraries. We do not require an account. Optional ads (when configured) are provided by Google AdSense and subject to their policies. The API Tester sends requests only from your browser to URLs you enter — use it only on systems you own or have permission to test.
Privacy policy · About · Contact · Blog · Canonical: snaputilspro.com