gotool.app · Privacy-first micro-utilities
Completely client-side, privacy-first developer and business tools running at the edge.
No sign-up · No uploads · No tracking
Knowledge base
Long-form, no-fluff explainers on the algorithms, standards and engineering decisions behind everyday utility software. Written to be read — not skimmed.
Image Optimization
How VP8 intra-frame prediction and entropy coding shave 25–35% off image weight — and why the entire pipeline can run inside your browser tab. A practical tour for developers.
Read GuideQR Codes
Reed–Solomon parity codes let a QR symbol survive up to 30% damage and still scan instantly. We break down the four ECC levels — and when each one earns its keep.
Read GuideDeveloper Tools
One stray trailing comma can bring an entire integration down. Learn how JSON parsers actually work, which errors they catch, and how schema validation enforces structure.
Read GuideUnit Conversion
A $125-million Mars spacecraft was lost to a unit mix-up. From SI base units to IEEE 754 rounding artefacts — here is what correct conversion actually takes.
Read GuideDocument Security
A digital signature proves who signed a document and that not a single byte has changed since. Hashing, key pairs and PKI trust chains — minus the maths degree.
Read GuidePrivacy Engineering
The safest database is the one that never receives your data. The engineering case for moving computation to the edge — and the honest limits of the approach.
Read GuideTool ecosystem directory
Each Gotool utility ships as its own lightweight subdomain with a single job done exceptionally well. They share one design system, one privacy protocol and one promise: your files stay on your machine.
Roadmap status is published openly. Every chip becomes a standalone app — under the same zero-upload guarantee.
Core privacy protocol
Every Gotool utility is compiled to run exclusively inside your browser engine using client-side JavaScript and WebAssembly. Files are read into memory, transformed locally, and handed straight back to you.
The full contract is in our Privacy Policy and Cookie Policy.
About Gotool
Gotool exists because most “free” web utilities quietly ship your data to a server: your screenshots, your contracts, your JSON payloads. We invert that model. The software travels to your data — never the other way round.
Alongside every tool we publish the theory behind it, so you understand exactly what happens to your files and why the results are trustworthy. No dark patterns, no sign-up walls, no surprises.