u/jancekbancek7 — reddlx

In-browser dataset workbench / converter — completely FREE, no upload, no signup

Built a simple browser-based tool for quickly opening and exploring data files.

No signup, no account, no backend. Everything runs locally in your browser with DuckDB-WASM, so your data never leaves the tab.

It supports Parquet, CSV, TSV, JSON, NDJSON, Arrow, and Excel.

You can:

browse millions of rows
profile columns
filter, sort, rename, cast, dedupe, and transform data
edit cells with undo/redo
run SQL
export to CSV, Parquet, Excel, JSON, and more

parquetbay.com

Free, no ads. If a file in your workflow breaks it, tell me and I'll fix it — that's most of why I'm posting. All suggestions/critique is welcomed!

u/jancekbancek7 — 2 days ago

▲ 2 r/SideProject

Built a serverless P2P file transfer tool that runs entirely in the browser

I built a small browser-based P2P file transfer tool after getting tired of moving large files through cloud storage first.

It’s called Pairchute. The whole thing is just a static page with no accounts, backend, or file relay.

The connection setup is intentionally manual:

A creates an invite and sends the generated text to B.
B pastes it in, generates a response, and sends that text back.
A pastes the response and the peers connect.

That copy-paste exchange replaces a traditional signaling server.

Once connected, the actual file transfer happens directly over WebRTC. Transfers are DTLS encrypted, streamed to disk instead of being held in browser memory, split into chunks, hash-verified, and can use up to eight parallel lanes to transfer file faster.

The only external network request used for establishing the connection is a public STUN lookup. If both machines are on the same LAN, the actual file data stays on the local network.

The largest transfer I’ve tested so far was around 630 GB.

I put it at pairchute.com if anyone wants to try it. Mostly posting because I’d like to find edge cases I haven’t run into yet. If something breaks, or if you see something that could be designed better, I’d be interested in the feedback.

reddit.com

u/jancekbancek7 — 3 days ago

▲ 7 r/sysadmin+1 crossposts

Free to use windows .dmp reader

Windows creates a minidump every time it blue-screens. It usually tells you exactly what crashed, but reading it means installing WinDbg and digging through the output.

I built a simpler option.

Drop the .dmp file into dumpreader.com and it shows:

the stop code in plain English
the driver most likely responsible
the relevant call stack

Free, no ads, no account.

The dump is uploaded for parsing because the parser runs server-side. It’s processed in memory and discarded immediately. Nothing is stored.

All suggestions/critique is welcomed!

u/jancekbancek7 — 3 days ago

▲ 9 r/3DPrintingTools

Made a browser 3D converter because I was tired of uploading STEP files to random sites

Every time I needed a STEP turned into an STL, or any other conversion, I ended up on some converter site that wants an email address and keeps your file on their server for a day. So I built one with no server at all.

It's OpenCascade compiled to WASM running in the tab. Drop a file, look at it (shaded / wireframe / edges / x-ray, per-part visibility for assemblies), convert it. 34 formats read, 16 written, every combination works. The options that actually decide whether the output is usable are all exposed: binary vs ASCII, output units, Z-up vs Y-up, tessellation quality, recentre, weld, flip normals. Drop several files at once and you get a ZIP back.

No backend, no account, no size limit, no upload. The page is served with `default-src 'self'` and no external connect-src, so it can't phone home even if I wanted it to. Works offline once loaded.

There's a Benchy on the landing page if you want to poke at it without hunting for a file: cadverter.net

Free, no ads. If a file in your workflow breaks it, tell me and I'll fix it — that's most of why I'm posting.

u/jancekbancek7 — 3 days ago