Offline File Converter for Windows
Just Converter
Just Converter is a free Windows app for local file conversion, HEIC to JPG exports, media conversion, and PDF merge/split workflows. It is best for users who want private conversion work without uploads, subscriptions, browser size limits, or cloud processing. It runs on Windows 10 version 19041.0 or higher and Windows 11, and it is available through the Microsoft Store plus installer and Portable ZIP downloads.
It is built for private file handling such as HEIC to JPG exports, PDF page extraction, audio or video format changes, and document conversion work that is faster when everything stays local. The trust signal is simple: your files remain on your Windows machine, and the app is distributed by Osenpa through the Microsoft Store and direct download links on this page.
Just Converter Screenshots & Interface
What is Just Converter?
Just Converter is a free local file converter for Windows 10 and Windows 11 from Osenpa. It converts video, audio, images, HEIC photos, and PDF documents entirely on your own device, so standard workflows do not require uploads or an internet connection. The app combines everyday format conversion with practical PDF tools, batch processing, and a straightforward desktop interface that is easier to use than command-line tools.
Best for: Windows users handling private file conversion, HEIC photo exports, PDF tasks, office documents, and mixed media batches that are easier to manage locally than in an online converter.
Common tasks: Converting HEIC to JPG, exporting PDF pages as images, merging or splitting PDFs, changing video or audio formats, and processing groups of files in one session with custom output naming.
Just Converter vs. Other File Converters
| Feature | Just Converter | CloudConvert | SmallPDF | HandBrake | FFmpeg (CLI) |
|---|---|---|---|---|---|
| Local processing (no uploads) | Yes — 100% offline | No — cloud-based | No — cloud-based | Yes | Yes |
| Graphical interface (no CLI) | Yes | Yes (web UI) | Yes (web UI) | Yes | No — command line only |
| Video conversion | Yes (MP4, AVI, MKV, MOV, WEBM, WMV) | Yes | No | Yes | Yes |
| Image conversion (incl. HEIC, AVIF) | Yes | Yes | No | No | Partial |
| PDF tools (merge, split, export) | Yes | Yes | Yes | No | No |
| Batch conversion | Yes | Yes (paid plan for large batches) | Limited (free tier) | Yes | Yes (via scripting) |
| File size limits | None (limited only by your hardware) | Yes (free plan: 1 GB) | Yes (free plan: 2 MB PDF) | None | None |
| Free to use | Yes — fully free | Freemium (limited free tier) | Freemium (limited free tier) | Yes — fully free | Yes — fully free |
Why Choose Just Converter Instead of Online Converters
Online converters can be convenient, but they also bring upload queues, size limits, and privacy tradeoffs. Just Converter is built for Windows users who want local processing, batch control, and broad format support in a dedicated desktop app that runs on their own machine.
Why users choose it: Compared with upload-based tools, Just Converter removes waiting time, file-size anxiety, and unnecessary exposure of personal documents. Within the Osenpa software portfolio, it is the app dedicated to private local file work, especially for HEIC, PDF, and mixed media conversion on Windows.
Core Features
- Fully Local Processing: Every conversion runs on your own device. Files are never uploaded to any server. Just Converter does not require an internet connection for ordinary conversion workflows.
- Video Conversion: Convert between MP4, AVI, MKV, MOV, WMV, and WEBM. Export animated GIF output. Extract audio from video files. Remuxing is used where possible to preserve quality without re-encoding.
- Audio Conversion: Convert between MP3, WAV, FLAC, AAC, OGG, WMA, M4A, and OPUS. Audio can also be exported directly from supported video inputs.
- Image Conversion: Convert between JPG, PNG, WEBP, AVIF, BMP, TIFF, GIF, ICO, and HEIC. Convert individual images to PDF or combine multiple images into a single PDF.
- Document & PDF Tools: Convert across TXT, DOCX, PDF, HTML, EPUB, MD, CSV, XLSX, and PPTX. Merge multiple PDFs into one file. Split a PDF into separate pages. Export PDF pages as JPG, PNG, or WEBP. Multi-page output can be saved as separate files or packed into a ZIP archive.
- Batch Productivity: Convert multiple files in one run. Reorder files with drag-and-drop or move up/down controls. Add more files after the initial selection. Use custom naming patterns for batch output. Recent output folders and last-used settings are remembered between sessions.
- 16-Language Support: Natively available in English, Türkçe, Deutsch, Français, Español, Português, Italiano, العربية, 中文, 日本語, 한국어, हिन्दी, Bahasa Indonesia, Русский, עברית, and Tiếng Việt — with automatic system language detection.
Frequently Asked Questions
- Is Just Converter completely free?
- Yes. Just Converter is free to download and use on Windows. There are no paid tiers, subscriptions, or premium features, and it is available through the Microsoft Store and direct download links on this page.
- Who is Just Converter for?
- Just Converter is for Windows users who want private everyday file conversion, including people handling HEIC photos, PDF tasks, media conversion, batch exports, and office or support workflows where uploading files is inconvenient or inappropriate.
- What tasks is Just Converter best for?
- Just Converter is best for HEIC to JPG conversions, batch image exports, audio and video format changes, PDF merge and split jobs, and other local file workflows that benefit from staying on the same Windows PC.
- Does Just Converter upload my files to the cloud?
- No. Just Converter processes everything locally on your device. Files are never sent to any server. All conversion happens on your own machine without an internet connection.
- What's new in Just Converter 1.1.0?
- Version 1.1.0 adds an About page with version and update status details, manual update checks, website and email buttons, a Supporters page, background update checks, toolbar and layout polish, refreshed Help and translations, safer external link handling, install-specific data paths, and a Magick.NET security update.
- What file formats does Just Converter support?
- Just Converter supports video formats (MP4, AVI, MKV, MOV, WMV, WEBM, GIF), audio formats (MP3, WAV, FLAC, AAC, OGG, WMA, M4A, OPUS), image formats (JPG, PNG, WEBP, AVIF, BMP, TIFF, GIF, ICO, HEIC), and document/PDF workflows (TXT, DOCX, PDF, HTML, EPUB, MD, CSV, XLSX, PPTX).
- What Windows versions does Just Converter support?
- Just Converter supports Windows 10 version 19041.0 or higher and Windows 11. It is a native WPF desktop application built on .NET 8.
- What PDF tools are included in Just Converter?
- Just Converter includes dedicated PDF tools: merge multiple PDFs into a single file, split a PDF into separate pages, export PDF pages as JPG/PNG/WEBP images, and create a PDF from multiple images. Multi-page output can be exported as separate files or as a ZIP archive.
- Can Just Converter convert HEIC to JPG without uploading the file?
- Yes. Just Converter converts HEIC images (from iPhone and iPad) to JPG, PNG, WEBP, and other formats entirely on your Windows device. The file never leaves your computer. There are no file size limits, no upload wait times, and no account required.
- How is Just Converter different from online converters like CloudConvert or SmallPDF?
- Online converters require you to upload your files to a server, which introduces privacy concerns, file size limits, and upload/download wait times. Just Converter processes every file locally on your own machine using FFmpeg and libvips. There are no size limits (only your hardware), no cloud dependency, no account, and your files stay on your device at all times.
- Does Just Converter support converting video to animated GIF?
- Yes. Just Converter can export video files as animated GIF. Select any supported video input (MP4, AVI, MKV, MOV, WMV, WEBM), choose GIF as the output format, and the entire conversion runs locally without any upload.
