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Engineering tools, without the friction.
Fast, free and privacy-first utilities for developers and engineers. Format JSON, decode a token, plan a subnet, build a cron schedule — all in your browser, none of it on our servers.
Opens the command palette. Works from any page.
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Starred and recently used tools, remembered only in this browser.
Browse by category
Eleven categories, growing towards full coverage of the engineering toolbox.
Most used tools
The ones people come back for.
JSON Formatter
JSON
Pretty-print JSON with configurable indentation and sorted keys.
Runs in your browser
Base64 Encoder
Encoding
Encode text or files to Base64, with URL-safe and MIME options.
Runs in your browser
JWT Decoder
API
Decode a JWT header and payload, and check expiry and standard claims.
Runs in your browser
Base64 Decoder
Encoding
Decode Base64 back to text or download it as a file.
Runs in your browser
JSON Validator
JSON
Check JSON syntax and get the exact line and column of any error.
Runs in your browser
Unix Timestamp Converter
Developer
Convert a Unix timestamp to a human date and back, in any time zone.
Runs in your browser
UUID Generator
Developer
Generate cryptographically random UUIDs in bulk (v4, v7 and nil).
Runs in your browser
Hash Generator
Developer
Hash text or files with MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32.
Runs in your browser
Recently added
New tools ship regularly. These are the newest.
- XML Formatter Pretty-print XML with configurable indentation and well-formedness checks.
- Subnet Calculator Split a network into evenly sized subnets and plan address allocation.
- CIDR Calculator Expand an IPv4 CIDR block into its network, range, mask and host count.
- SQL to JSON Turn INSERT statements into JSON rows for fixtures, seeds and tests.
- SQL Minifier Collapse SQL to a single line for embedding in code or config.
- SQL Formatter Format SQL into a consistent, reviewable shape with keyword casing options.
Why use Engineering Utility Platform?
Most online utilities pay for themselves with your attention or your data. This one is built the other way round.
Fast
Pages are server-rendered and the tools run locally, so there is no round trip between typing and seeing a result.
Privacy-first
Client-side tools never send your input anywhere. Where that is true, the page says so — and where it is not, it says that too.
No registration
No account, no email, no paywall in front of a text box. Favourites and preferences live in your browser, not in our database.
Works everywhere
Every tool is laid out for small screens as a first-class case, not as a shrunken desktop UI.
Keyboard-driven
Ctrl/Cmd + K to find anything, Ctrl/Cmd + Enter to run, and full keyboard navigation throughout.
Free
Every tool in the catalog is free to use, with no per-day limits and no watermarked output.