Refentra: browser-local image tools with App Router and Web Workers

[MarcoRysz]

Sharing Refentra, an App Router project for image operations that run locally in browser workers.

The quickest workflow to try is compressing an image below a chosen KB/MB limit. It checks the encoded byte count and reports whether the target was reached. JPEG, PNG and WebP input are supported; HEIC is not. Image bytes are not uploaded, and there is no account requirement.

It also includes batch WebP-to-JPG conversion with ZIP downloads and JPEG metadata removal. The processing core is shared across the tool routes rather than duplicated per page.

A deployment detail that may help other App Router users: headers() does not carry over to output: "export". For our static build, we generate the hosting headers from the rendered output, with per-page inline-script CSP hashes and a separate 404 fallback. Worker execution remains in the browser; changing the web host does not turn file processing into a server API.

I'd welcome concrete feedback on browser/worker behavior or upload requirements the existing workflow does not cover. Please describe the requirement or failure without sharing a private image.

Maintainer disclosure: Refentra is my project, developed with AI agents. This post is AI-generated and checked against the current implementation; no user or growth results are claimed.

Update September 8: the demo now opens at 200 KB. There is also a 2 MB preset. Both limits can still be edited. For the photo-privacy workflow, this guide explains local metadata removal, an ExifTool alternative, and how to verify the cleaned copy.

[NeoTim]

I'd suggest the following approach:

1. Check if you're using the latest version - many issues are resolved in recent releases.
2. Review the official documentation for any breaking changes.
3. Try clearing your cache/node_modules and reinstalling dependencies.

If none of these work, providing a minimal reproduction repo would help the maintainers diagnose the issue faster.