HelperCrate: 101 tools that never upload your files
Most online utilities ask you to upload a file to a server you cannot see. HelperCrate takes the opposite approach: every tool runs in the browser, on the device, with no upload step at all. The result is a 101-tool platform that is faster, cheaper to run and easier to trust.
A utility platform with a privacy constraint
The brief was not “build another tools site”. It was to build a platform where the privacy claim is structural, not a policy promise.
STACK
The brief
Small online utilities are usually thin wrappers around a server. You upload a file, wait, download the result. That model creates a privacy problem, a hosting bill and a performance ceiling. HelperCrate was designed around a single rule: the file stays on the device.
What shipped
The platform now contains 101 tools across media, images, PDFs, text, developer utilities and everyday conversions. Some are simple; some — like the FFmpeg/WASM media pipeline and Whisper transcription — are substantial pieces of engineering. All of them sit behind one consistent interface.
The technical core
Media processing runs through WebAssembly, including an FFmpeg build compiled for the browser. Background removal runs an on-device model rather than sending an image to an API. OCR handles multiple languages locally. PDF tooling and developer utilities follow the same pattern: load the file into browser memory, process it there, hand back the result.
Why it holds up
Browser-side processing removes the upload round trip, which makes the tools feel immediate. It removes the server-side storage requirement, which keeps running costs low. And it makes the privacy claim easy to verify: open the network tab and watch no file leave the device.
Design and maintenance
A 101-tool platform fails if every tool looks and behaves differently. Shared layout, shared controls and shared output handling keep the experience coherent. DaltSync continues to maintain the platform, add tools and keep dependencies current.
Four tools, one system
On-device background removal, multi-language OCR, FFmpeg video trimming and Whisper subtitles — all processing locally.
A live product, not a proof of concept
HelperCrate is used as a working platform and maintained by DaltSync.
The platform demonstrates the harder side of front-end engineering: memory management, WebAssembly, large-file handling, on-device inference and a consistent UI across a hundred separate tools. It is also a useful answer to the question “can a browser actually do this?” — often, yes, and without sending your files anywhere.
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Need a platform with a hard constraint?
Privacy, performance, offline use, large files, a workflow no product covers — tell us the constraint and we will tell you what is possible in a browser.