Free converters that work in your browser
Last updated: September 14, 2026
What is Super File Converter?
Super File Converter is a collection of 63 file converters that run entirely in your web browser. Pick the format you have, pick the format you want, drop the file in, and download the result. Nothing you drop in is ever sent to a server.
The goal is simple: give people fast, clean converters that just work, without accounts, paywalls, upload queues, or watermarks. You open a page, convert, and leave.
Who runs it?
Super File Converter is built and maintained by Velovid, an independent web development studio. If you have a suggestion for a converter or find something that is broken, you can reach us at velovid.net/contact.
What can I convert?
Image Converters
Every image converter runs on the Canvas API right in your browser. Drop in a whole folder of photos, convert them all at once, and download a ZIP. Nothing is uploaded. PNG to JPG, JPG to PNG, WebP to JPG, WebP to PNG, PNG to WebP, JPG to WebP, GIF to PNG, GIF to JPG, BMP to PNG, BMP to JPG, SVG to PNG, SVG to JPG, AVIF to JPG, AVIF to PNG, ICO to PNG, HEIC to JPG, HEIC to PNG.
Video Converters
These converters load a WebAssembly build of FFmpeg into your browser the first time you use one, then run entirely on your own machine. Large files stay on your device. MOV to MP4, MKV to MP4, AVI to MP4, WebM to MP4, FLV to MP4, WMV to MP4, M4V to MP4, 3GP to MP4, MPG to MP4, TS to MP4, GIF to MP4, MP4 to WebM, MOV to WebM, MP4 to MOV, MP4 to MKV, MP4 to AVI, MP4 to GIF, MOV to GIF, WebM to GIF.
Audio Converters
Audio is encoded with FFmpeg running in your browser. Convert a whole batch to the same format in one pass, or pull the soundtrack out of a video as MP3. Video to MP3, MP4 to MP3, MOV to MP3, Audio to Any, OGG to MP3, WAV to MP3, M4A to MP3, FLAC to MP3, AAC to MP3, WMA to MP3, OPUS to MP3, AIFF to MP3, MP3 to WAV, MP3 to OGG, MP3 to M4A, MP3 to FLAC, WAV to FLAC, M4A to WAV, OGG to WAV.
PDF Converters
PDF pages are rendered with PDF.js and photos are embedded with pdf-lib, both running locally. Your documents never leave your device. PDF to JPG, PDF to PNG, JPG to PDF, PNG to PDF, WebP to PDF.
CAD Converters
DXF files are written in AutoCAD R12 format, the most widely supported flavour, and open in AutoCAD, LibreCAD, QCAD, Fusion 360, Inkscape and LightBurn. JPG to DXF, PNG to DXF, PDF to DXF.
How does it work without a server?
Image conversion uses the Canvas API built into every browser. Video and audio conversion load a WebAssembly build of FFmpeg (about 31 MB, downloaded once and cached) and run it on your own machine. PDF pages are rendered with PDF.js and photos are combined into PDFs with pdf-lib. HEIC photos are decoded with libheif. DXF files are traced and written in plain JavaScript. All of that executes on your device, which is why there is nothing to upload.
Privacy by design
Because there is no upload step, your files cannot be stored, scanned, or leaked by us. There are no user accounts and no session tracking beyond standard analytics. The site uses Google Analytics to understand which converters are popular and third-party advertising networks to display ads, both only with your consent. Full details are in the Privacy Policy.
Is it free?
Every converter is free to use with no sign-up required. The site is supported by display advertising. There are no file size limits enforced by a paywall and no watermarks added to your downloads.
Contact
For questions, bug reports, or converter suggestions, contact us through velovid.net/contact. We read every message.