“Every file converter online was broken. Not technically — technically they worked. They were broken in a more fundamental way: they treated your files as data to be uploaded, stored, and processed on infrastructure you had no visibility into. We got tired of it. So we built something different.”
43+
Format pairs
0
Server uploads
100%
In-browser
What we believe
Your files are yours. Full stop.
We mean this architecturally, not just as a policy. Our server has no file upload endpoint — it physically cannot receive your files. Every byte of your data stays in your browser's memory. Close the tab, it's gone.
Privacy is architecture, not marketing.
Anyone can write 'your files are private' on their landing page. We prove it by design. Open DevTools, go to the Network tab, convert a file. You will not see a single upload request. That's the standard we hold ourselves to.
Great tools don't ask for your email.
You should be able to convert a file without creating an account, entering a CAPTCHA, or watching a 30-second ad. We built a converter that respects your time. An account is optional — only if you want Pro features synced across devices.
What we actually built
FormatDrop is powered by WebAssembly — the same technology that lets desktop-grade software run in a browser tab. We compile real production conversion engines (ffmpeg, libvips, pdf-lib, heic2any) to WASM and ship them to your browser. When you drop a file, the engine runs locally on your machine. No round-trip, no latency, no upload.
The result: conversion speeds that rival native apps, privacy that no server-side tool can match, and a system that works entirely offline once the engine is cached.
Coverage
Images
HEIC, PNG, JPG, WebP, AVIF, SVG, GIF, TIFF, ICO, BMP
Video
MP4, MOV, AVI, MKV, WebM, WMV, GIF (animated)
Audio
MP3, WAV, OGG, FLAC, M4A, AAC, Opus, AIFF
Documents
PDF ↔ PNG, DOCX ↔ PDF, EPUB, SVG, PPTX, Pages
Try it — no account needed
Drop any file and see conversion happen entirely in your browser.