UniFab supports the full library of mainstream video containers. MP4 for phones and social, MKV with multi-track audio and subtitles preserved (lossless remux when source is H.264/AAC), MOV for Apple workflows, plus AVI / WMV / FLV / M2TS / TS / WebM and 990+ more. Pick any output resolution from Full HD 1080p down to SD 480p, with full codec control on every job.
Any format you need, 1000+ supported
Extract crystal-clear audio from any video, or convert between audio formats. UniFab handles every common codec: universal MP3 for podcasts and audiobooks, AAC for Apple devices, lossless WAV and FLAC for studio archives, and Dolby AC3 5.1 surround for home cinema. UniFab preserves multi-track audio (EN / JP / KR / DE …) end-to-end so you never lose a language stream.
Don't know which codec or resolution your device wants? UniFab's device profiles auto-pick the right settings for the exact phone, tablet, smart TV or streaming box you own. Choose the brand and model, hit Convert, and you're done. No spec sheets, no guesswork.
Every platform has its own preferred codec, bitrate and aspect ratio. UniFab's one-click presets meet them out of the box, so your uploads pass each platform's auto-encoder cleanly without quality loss. We built these presets around the platforms that account for most of the world's video uploads.
Why UniFab free video converter
Free should never mean compromised. UniFab delivers lossless quality, lightning-fast GPU encoding, and 1000+ format support, without a single paywall, watermark, or hidden cap.
100% free forever
This free video converter software was once $89.99 lifetime — now free for everyone, with no paywall, upsell or hidden tier.
Supports 1000+ formats
MP4, MKV, AVI, MOV, WMV, FLV, M2TS, MPEG and 990+ more video and audio codecs.
Up to 50× faster conversion
Hardware-accelerated conversion runs up to 50× faster than CPU-only tools, saving hours of waiting on every batch.
99.99% success rate
Smart auto-recovery handles corrupt or unusual source frames, so conversions almost never fail, even on damaged files.
Lossless quality
Pixel-perfect output preserves every detail. Remux MKV to MP4 without re-encoding, or use the High Quality preset for visually lossless results.
Change video format for any device or platform
A complete video format converter for every screen you own — one video format converter that handles MP4, MKV, AVI, MOV, MP3 and 1000+ codecs, with 100+ ready-made device presets so your output just plays.
- One-click format conversion for all major video and audio formats.
- Device-ready presets for phones, tablets, TVs, game consoles, and more.
- Platform-optimized exports for YouTube, TikTok, Instagram, and more.
HD video converter: convert videos without quality loss
A true HD video converter for 720p and 1080p Full HD sources. UniFab preserves every pixel of picture and every audio channel, through lossless remux when the source allows, or high-bitrate re-encoding when format conversion is required.
- Preserve quality during format conversion for supported sources.
- Multiple resolution presets from SD to Full HD.
- Flexible codec and bitrate settings for quality & file size control.
Up to 50× faster conversion with GPU acceleration
UniFab taps your GPU's dedicated encode block (NVIDIA NVENC, Intel Quick Sync, AMD VCE), not just the CPU like most other free converters. The result: lightning-fast conversion at up to 50× the speed of CPU-only tools, with zero compromise on output quality.
- Hardware-accelerated H.264 and H.265 encoding.
- Supports NVIDIA, Intel, and AMD GPUs.
- Automatic fallback for unsupported codecs.
Efficient batch processing for large workloads
Drop an entire folder, pick one output format, and let UniFab batch convert every file in a single job. Built for content creators, podcasters and archivists with backlogs of video to process. Turn an overnight queue into a few minutes of work.
- Add entire folders in one click.
- Apply the same settings across all files.
- Process multiple files simultaneously for faster results.
Free online video converter — no download required
No install, no sign-up, no credit card. Run UniFab's online video converter in any modern browser — Chrome, Safari, Firefox or Edge — on Windows, Mac, Linux or Chromebook. Your uploads are processed securely and auto-deleted after conversion, so nothing lingers on the server.
- Convert files online in just a few clicks.
- Secure uploads with automatic file deletion.
- No watermark, no daily limits.
More than a video converter: six built-in editing tools
Trim, crop, watermark, subtitle, color-grade, speed-ramp, without opening a separate editor.
Trim, crop and rotate
Multi-point trimming on the timeline, 16:9 / 9:16 / 1:1 / 4:3 aspect crop, four-direction rotation.
Color and effects
Brightness, contrast, saturation, gamma sliders. Real-time preview built in.
Watermark
Text or image watermark, anchor position, opacity slider. Or strip one from the input.
Subtitles
Burn-in, soft-mux, or external SRT. Custom font, color, size, outline.
Audio
Volume curve, fade-in/out, audio track swap, multi-channel passthrough.
Speed
0.25× slow-motion to 4× time-lapse. Keyframe-based speed ramps for cinematic pacing.
How to convert video for free in three steps
Same UniFab app, 20+ AI tools beyond free conversion
Trusted by
"UniFab's GPU acceleration is the real deal. Anyone used to CPU-only converters will be shocked at how fast a Full HD job finishes."
"One of the most generous free tiers on the market. No time limit, no watermark, all formats. A clear winner among free Windows video converters."
"Editor's Pick for free Windows video tools. Subtitle handling, multi-track audio support and format breadth are above the field."
"Lossless remux on MKV to MP4 just works, no transcode penalty. Hard to beat the value when it costs nothing."
"UniFab takes the friction out of free converters. No nag screens, no upsells, no surprise watermarks. Just convert and go."
YouTech
Youtuber with 1.71M followers
"For a free product this is unfair. UniFab's lossless MKV → MP4 remux just works, GPU acceleration is on by default, and I haven't found a single format it can't handle. Replaced my paid converter in one afternoon."
Converting my entire family-trip Full HD MKV archive for the smart TV. UniFab nailed it without re-encoding. Saved a full weekend of waiting on the old converter.
Eric
Photographer
As a teacher I turn MKV class recordings into MP4s every day. UniFab is 3× faster than the free tool I used before, and the batch mode is a lifesaver.
Sophia
Vlogger
Extracted MP3 audio from 200 podcast videos in one overnight batch. Zero failures, no babysitting, MP3 quality identical to source. Free should never feel this premium.
Jackson
Videographer
FAQs about free video converter
Learn more through our YouTube channel, guidebook, or community discussion.
Yes. 100% free forever. Originally sold for $89.99 lifetime or $59.99 yearly, now permanently free for everyone, personal and commercial use.
No watermark, ever. Output is identical to the source at any format, any resolution, any duration. Long videos get the same clean output as 30-second clips.
1000+ video and audio formats. Common containers: MP4, MKV, AVI, MOV, WMV, FLV, M2TS, TS, MPEG, 3GP, ASF. Audio output: MP3, AAC, WAV, FLAC, OGG, AC3. Resolutions: Same as Source · Full HD 1080p · HD 720p · SD 540p · SD 480p.
Download UniFab → Open Video Converter → drag-drop your MKV file → click Output → pick MP4 (or any of 1000+ formats) → click Start. For H.264 / AAC sources, UniFab does a lossless remux in seconds, with no re-encoding and original quality intact.
Add the video → Output → Choose other format → Audio tab → MP3 → set bitrate (default 320 kbps) → Start. Works for batch jobs too. Extract MP3s from a whole folder of videos in one run.
UniFab Video Converter
Originally $89.99 lifetime, now 100% free forever, with batch processing and a built-in editor.
Tips & Resources About Video Converter
5 Ways to Convert MKV to MP4 Without Quality Guesswork
A 2026 hands-on guide to converting MKV (Matroska) to MP4 the right way. We benchmarked five tools on a 3.2 GB 4K H.265 source — UniFab Video Converter, CloudConvert, VLC, HandBrake, and FFmpeg — and unpack the container-vs-codec basics that make the difference between visually lossless remuxing and a degraded re-encode. Includes step-by-step workflows for every tool, troubleshooting for five common errors, and FAQs covering 4K, mobile, batch, and subtitle handling.
YouTube to WAV: 3 Methods for Files and Playlists (2026)
Tested 2026 guide to extracting YouTube audio as WAV — the lossless audio format used by audio engineers and DAW users (Ableton, FL Studio, Logic Pro). Three working methods covered: online YouTube to WAV converters for quick one-clip jobs, UniFab Video Converter for highest quality on Windows and Mac, and yt-dlp + FFmpeg command-line for batch and headless workflows. Plus an honest 'true lossless or not?' answer because YouTube doesn't actually stream lossless audio, sample rate / bit depth picks for DAWs, common pitfalls, and 10 FAQs.
7 Free Video Converters Tested in 2026: Limits and Watermarks Compared
This guide compares seven free video converters by watermark rules, platform, processing location, format support, and practical limits. It provides a three-step MP4 workflow, focused comparison tables, and scenario-based recommendations for local, cross-platform, and browser conversion.
How to Upscale 480p to 1080p in 2026: 5 Best Upscalers Tested (Step-by-Step Guide)
This 2026 guide shows you how to upscale 480p to 1080p with five tested tools, starting with a hands-on UniFab Video Upscaler AI tutorial that runs on any modern PC. Compare AI upscalers (UniFab, AVCLabs), editors (DaVinci Resolve, Premiere Pro), and a free online converter (ANYMP4), see real benchmark timings on four GPUs, and find the right workflow whether you have one home video or a full DVD archive to convert from 480p to 1080p.
"Exactly what a free video converter should be: fast, watermark-free, and respects your privacy. The GPU acceleration alone is worth the download."