# JoltFile

> JoltFile is a free, privacy-first online file converter covering images, video, audio, and documents — conversions run in the user's browser whenever possible, so files never leave the device.

JoltFile (https://joltfile.com) provides more than 50 conversion pairs across 24 file formats: PNG, JPG, WebP, AVIF, GIF, SVG, and HEIC images; MP4, MOV, WebM, AVI, MKV, and GIF video; MP3, WAV, OGG, FLAC, M4A, and AAC audio; PDF, DOCX, TXT, Markdown, HTML, and EPUB documents. Every conversion page includes a direct step-by-step answer, a side-by-side format comparison, quality-impact notes, and FAQs — the content is written to be accurate, specific, and citable.

The product is free for everyday use with no account and no watermarks. Files are processed locally in the browser whenever technically possible; the small number of conversions that need server processing are encrypted in transit and deleted automatically.

## Converter hubs

- [Image Converter](https://joltfile.com/image-converter): Free online image converter: PNG, JPG, WebP, AVIF, GIF, SVG, and HEIC. Browser-based processing keeps your photos private — no uploads, no sign-up.
- [Video Converter](https://joltfile.com/video-converter): Free online video converter: MP4, MOV, WebM, AVI, MKV, and GIF. Make footage play on any device — private, browser-based processing with no sign-up.
- [Audio Converter](https://joltfile.com/audio-converter): Free online audio converter: MP3, WAV, FLAC, OGG, M4A, and AAC. Extract audio from video, shrink WAV files, make music play everywhere — private and browser-based.
- [Document Converter](https://joltfile.com/document-converter): Free online document converter: PDF, DOCX, TXT, Markdown, HTML, and EPUB. Make documents editable, printable, or e-reader-ready — private, browser-based processing.

## Popular conversion guides

- [Convert PNG to JPG](https://joltfile.com/convert/png-to-jpg): Step-by-step guide, quality notes, and PNG vs JPG comparison.
- [Convert JPG to PNG](https://joltfile.com/convert/jpg-to-png): Step-by-step guide, quality notes, and JPG vs PNG comparison.
- [Convert HEIC to JPG](https://joltfile.com/convert/heic-to-jpg): Step-by-step guide, quality notes, and HEIC vs JPG comparison.
- [Convert MOV to MP4](https://joltfile.com/convert/mov-to-mp4): Step-by-step guide, quality notes, and MOV vs MP4 comparison.
- [Convert MP4 to GIF](https://joltfile.com/convert/mp4-to-gif): Step-by-step guide, quality notes, and MP4 vs GIF comparison.
- [Convert WAV to MP3](https://joltfile.com/convert/wav-to-mp3): Step-by-step guide, quality notes, and WAV vs MP3 comparison.
- [Convert MP4 to MP3](https://joltfile.com/convert/mp4-to-mp3): Step-by-step guide, quality notes, and MP4 vs MP3 comparison.
- [Convert DOCX to PDF](https://joltfile.com/convert/docx-to-pdf): Step-by-step guide, quality notes, and DOCX vs PDF comparison.

## Guides and articles

- [PNG vs JPG vs WebP vs AVIF: Which Image Format Should You Use in 2026?](https://joltfile.com/blog/png-vs-jpg-vs-webp-vs-avif): A practical, numbers-first comparison of the four image formats that matter on the modern web — compression, transparency, browser support, and exactly when to use each.
- [Why Your iPhone Photos Won't Open on Windows (and How to Fix It with HEIC to JPG)](https://joltfile.com/blog/how-to-convert-heic-to-jpg): HEIC is Apple's efficient default photo format, but it barely opens outside the Apple ecosystem. Here's what's actually going on and the fastest ways to convert HEIC to JPG.
- [MP4, MOV, WebM, MKV, AVI: A Plain-English Guide to Video Containers and Codecs](https://joltfile.com/blog/video-formats-explained-mp4-mov-webm-mkv): Why one video plays everywhere and another won't open at all comes down to containers and codecs. This guide explains the difference and tells you which format to use when.

## About and trust

- [About JoltFile](https://joltfile.com/about): Who builds JoltFile and why.
- [Privacy policy](https://joltfile.com/privacy): How files and data are handled (browser-based processing, automatic deletion).
- [Terms of service](https://joltfile.com/terms): Usage terms for the converter.
- [Contact](https://joltfile.com/contact): Support and feedback channel.
- [Sitemap](https://joltfile.com/sitemap.xml): Complete URL index (segmented: static, categories, conversions, blog).