Guides & How-tos
Convert GIF or APNG to MP4 and WebM Without Losing the Animation
Turn animated GIF and APNG files into modern MP4 or WebM video locally, with smaller-file strategies, honest transparency limits, and no uploads.
More from the blog
Guides, format comparisons, and privacy explainers on private, browser-first file conversion.
Privacy & Security
Extract and Convert Archives (RAR, 7Z, ZIP) Safely in the Browser
Open and repackage RAR, 7-Zip, and ZIP archives locally with real WebAssembly engines — with traversal and expansion protections and no uploads.
Format Deep-Dives
Convert EPUB, MOBI, and Kindle Ebooks Between Formats Privately
Move your DRM-free ebooks between EPUB, MOBI, and plain formats locally in the browser — reading-order preserved, nothing uploaded.
Privacy & Security
How to Compress Video and Images Without Uploading Them Anywhere
Shrink photos and video on your own device with adjustable quality and measured savings — a private alternative to upload-based compressors.
Format Deep-Dives
Convert 3D Models (STL, OBJ, GLB, STEP) for Printing and the Web
Convert between STL, OBJ, 3MF, GLB, glTF, PLY, and STEP CAD geometry locally with Open CASCADE and mesh tools — ready for 3D printing or web viewers.
Guides & How-tos
Convert DOCX and Markdown to PDF or EPUB in Your Browser
Turn Word documents and Markdown into shareable PDFs or reflowable EPUB ebooks locally, with honest notes on what layout survives the conversion.
Guides & How-tos
CSV, JSON, and Excel: Convert Structured Data Safely in the Browser
Move tabular data between CSV, JSON, TSV, and Excel/ODS locally — no uploading spreadsheets full of sensitive rows to a stranger’s server.
Guides & How-tos
Convert Camera RAW (CR2, NEF, ARW) to JPG Without Desktop Software
Develop Canon, Nikon, and Sony RAW files into shareable JPGs locally with a LibRaw WebAssembly decoder — no Lightroom, no cloud, no uploads.
Guides & How-tos
Extract Audio From Video: Convert MP4 and MKV to MP3 Locally
Pull the soundtrack out of a video file into MP3 or other audio formats entirely in your browser — perfect for talks, music, and podcasts, with no upload.
Guides & How-tos
How to Convert MOV to MP4 in Your Browser (iPhone Video, No Upload)
Make iPhone .mov clips play everywhere by converting them to .mp4 locally with a WebAssembly FFmpeg engine — private, watermark-free, and validated.
Guides & How-tos
Convert PDF to Images (and Images to PDF) Privately in Your Browser
Turn PDF pages into PNG or JPG snapshots, or combine images into a PDF — all processed locally with pdf.js and pdf-lib, with nothing uploaded.
Comparisons
AVIF vs WebP vs JPG: Which Modern Image Format Should You Ship?
A practical comparison of AVIF, WebP, and JPG — compression, quality, browser support, and transparency — so you can pick the right format for the web.