SUPER TOOLKIT ENGINEERING JOURNAL

Notes on Browser-Native WebAssembly & Local DSP

Architectural write-ups, codec benchmarks, and zero-upload engineering notes from the builders of Super ToolKit.

ENGINEERING DEEP DIVE·11 MIN READ

Why We Replaced Cloud FFmpeg Queues with In-Browser WebAssembly and OfflineAudioContext

When a user wants to extract a 4-minute MP3 soundtrack from a 650 MB MP4 screen recording, traditional conversion websites spend 95% of wall-clock time uploading the video over residential broadband. By demuxing the MP4 container inside a local ArrayBuffer and encoding via a compiled LAME WebAssembly module, total turnaround drops from 90 seconds to 3.4 seconds—with zero server bandwidth bills.

Even more importantly, keeping audio and video streams inside the browser’s volatile memory heap eliminates the single biggest privacy hazard on the web: unencrypted temporary S3 buckets storing user recordings for 24 hours.

Try the Local MP4-to-MP3 Engine →External Syndication Mirror

DOCUMENT SECURITY · 7 MIN READ

True PDF Redaction in Browser RAM vs. Vector Overlay Mistakes

Drawing a black rectangle over a Social Security Number in a PDF editor leaves the underlying ASCII string intact in the content stream. Here is how our /redact-pdf/ engine rasterizes redacted regions so sensitive text cannot be copy-pasted or recovered.

Open Redact PDF Studio →

DEVELOPER HYGIENE · 6 MIN READ

Stop Pasting Production JWTs and SQL Queries into Ad-Heavy Blogs

Server-rendered developer utilities often log query strings and POST bodies in reverse-proxy access logs. We built our JWT Debugger, SQL Formatter, and cURL-to-Code converter with strict client-side AST parsing and offline PWA support.

Open JWT Debugger →View Changelog →