About Zeraku

Most online tools require you to upload your files to a remote server. You trust that the server is secure. You trust that your data is deleted afterward. You hope nothing goes wrong in transit.

We built Zeraku to remove that trust requirement entirely. Every tool on Zeraku runs 100% inside your browser. Your images, audio files, spreadsheets, and documents never leave your device. Not partially — never. This isn't a marketing claim; it's a technical constraint we deliberately designed around.

Client-side processing is made possible by modern web technologies: WebAssembly, Web Workers, the Canvas API, and the Web Audio API. These standards let us run sophisticated AI models and data transformations directly in your browser — without any server round-trip.

No account required. No email address. No password. Open the tool, use it, get your result. That's the entire user journey.

We currently provide 12 free tools across four categories: Image, Audio, Data, and Document. Tools include AI-powered image forensics, image compression, audio transcription, JSON formatting, CSV profiling, photo colorization, color palette extraction, social media asset generation, and subtitle conversion.

We are actively building more tools and will continue to offer them for free. Our goal is to make powerful utilities accessible to everyone — regardless of budget or technical background.

Zeraku is developed and operated by Triengage Inc. (incorporation in progress, Tokyo, Japan). We were frustrated by the lack of trustworthy, privacy-respecting online tools. Too many "free" services monetize user data, store uploaded files indefinitely, or require unnecessary account creation.

We believe useful tools don't need to compromise your privacy. Zeraku is proof of that.