Convert Any File at the Edge.
Private. Instant. Free.
100% in-browser WebAssembly conversions with zero server retention and zero file size tracking. Powered by compiled Rust SIMD kernels and ephemeral Cloudflare Worker isolates.
How OpenFileConverter Works
By compiling native Rust codecs to WebAssembly with SIMD acceleration, conversions execute directly inside your browser's V8 isolate — eliminating network roundtrips and cloud storage costs.
Instant MIME Sniffing
Magic byte inspection verifies file headers locally in milliseconds before processing begins. Corrupt files and decompression bombs are trapped immediately.
Local In-Browser WASM
Multithreaded WebAssembly workers execute transformation loops in client RAM with 0 bytes sent across the network. Zero data leaks, zero server queues.
Instant Direct Save
Resulting Blobs are written directly to your local file system via File System Access API. RAM buffers are zeroed immediately upon download completion.
Live Edge Savings & Performance Calculator
Calculate how much time, cloud egress bandwidth, and subscription cost your team saves by eliminating centralized cloud converter hops.
Supported Conversions Matrix
Instant zero-latency conversion across 500+ document, audio, video, CAD, geospatial, and data formats.
PDF to Word (DOCX)
Converts native & scanned PDFs to editable Word documents with full OCR layout recovery.
HEIC to JPG (iPhone Photos)
Converts Apple iOS Live Photos and HEIF bursts into universal JPEG with EXIF intact.
MP4 to MP3 (Audio Extraction)
Fast audio stream demuxing at 320 kbps with automatic peak loudness normalization.
STEP to STL (3D CAD Mesh)
Converts precision B-Rep solid models to watertight triangular STL meshes for 3D printing.
Parquet to CSV (Data Engineering)
Columnar binary analytics tables converted into RFC-4180 CSV without memory bloat.
DWG to PDF (Blueprints)
AutoCAD 2D/3D engineering drawings exported to high-resolution vector architectural PDFs.
Zero-Retention Architecture by Design
We believe your documents, financial spreadsheets, medical scans, and source code belong exclusively on your hardware.
Your Local Device & Browser
Files read into ephemeral Uint8Array RAM buffers via HTML5 File API.
Ephemeral Worker Isolate (<128MB)
Dedicated V8 execution context strictly used for heavy video & CAD transcode.
SOC2 Type II & HIPAA Aligned
Zero electronic Protected Health Information (ePHI) or personal financial records ever touch centralized database tables or persistent object storage buckets.
Cryptographic Memory Shredding
Once bytes are downloaded, client memory buffers are overwritten with pseudorandom cryptosecure noise via Web Crypto API before garbage collection.
Zero Third-Party Trackers
No Google Analytics, no Facebook pixels, no ad retargeting cookies. We use privacy-preserving self-hosted telemetry with client IP anonymization.
Transparent Pricing for Any Scale
Start converting completely free in your browser. Upgrade to Pro for heavy gigabyte files, priority edge workers, and developer APIs.
Starter / Guest
Ideal for quick one-off personal conversions with 100% private client-side execution.
- Up to 50 MB per file
- 10 conversions per day
- 100% client-side WebAssembly engine
- Standard formats (PDF, JPG, PNG, WEBP)
- Zero file tracking or account requirement
Pro Edge
For heavy creators converting large batches all day. Cancel anytime from Stripe.
- Up to 50 MB per file
- 500 daily conversions on standard pairs
- Zero ads anywhere in the product
- All format pairs, incl. server-side engines as they ship
- Email support
Team & API
Automated conversion pipelines over the REST API and MCP tools. Priced to your workload — reach us at mgmt@adstim.net.
- Everything in Pro, for automated pipelines
- REST API with per-session quota reporting
- MCP tools for AI agent integration
- Volume pricing tailored to your workload
Need Pro Features for Just One Batch?
No credit card required. Unlock a 24-Hour Full Pro Pass instantly by watching a 15-second sponsored clip or completing a 2-minute market research survey.
Frequently Asked Questions
Detailed architecture, security guarantees, and developer runtime specifications.
How do client-side WebAssembly conversions work without uploading to a server?
We compile high-performance native Rust libraries (such as image-rs, resvg, symphonia, and tesseract-ocr) into WebAssembly binaries using wasm-pack and SIMD vector instructions. Your browser spins up dedicated Web Workers that read your file into RAM via File API and execute bytecode entirely inside your device's V8 isolate. Exactly zero bytes leave your local network.
What happens if my file is too large for browser RAM (>2GB)?
For files that exceed browser isolate memory limits or require heavyweight compute (such as 4K video transcoding or multi-gigabyte STEP 3D CAD meshes), OpenFileConverter seamlessly routes the job to an ephemeral Cloudflare Worker isolate. The Worker processes the stream in memory with a hard 30-second execution ceiling and purges all byte arrays immediately.
Are my files stored on Cloudflare, AWS, or any database?
Never. OpenFileConverter has no persistent disk storage attached to conversion nodes. Cloudflare D1 stores only rate-limiting tokens and ephemeral job UUIDs (with zero filename or content metadata). We maintain a cryptographic shredding log that proves RAM zeroing upon request completion.
What is the difference between client-side Rust WASM and edge remuxing?
WASM transforms file formats that require pixel or token mutation (e.g. converting a PNG raster to SVG vectors, or running OCR on a PDF). Remuxing is container repacking (e.g. moving an H.264 stream from an MKV container into an MP4 container) which copies packet streams directly without re-encoding, finishing in under 15 milliseconds.
How does the 24-Hour Value-Exchange Pass work?
Users who hit free tier rate limits (10 files/day) can choose between subscribing to Pro Edge for $12/mo or unlocking a full 24-hour pass by watching a 15-second rewarded video ad or taking a brief survey. Our edge worker cryptographically signs an HMAC token stored in client localStorage that grants Pro rate limits for 86,400 seconds.
“OpenFileConverter replaced our $3,000/mo centralized converter bill while guaranteeing zero customer medical records ever touch an external disk under HIPAA. The in-browser WebAssembly speed is unreal.”