Uwarp

Output is MP4 (H.264 + AAC). Upscaling uses classic scale filters (Lanczos/bicubic), not neural AI. First run downloads FFmpeg (~25 MB) once in this browser.

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Free video upscaler — upscale video online

Free video upscaler online. Upscale video 2×–4× in your browser with Lanczos scaling — MP4 download, no signup, no server upload.

What is a video upscaler?

A video upscaler enlarges a clip’s pixel dimensions — for example upscale video from 720p toward 1080p or 4K-class sizes with a 2×, 3×, or 4× factor. This free video upscaler online tool runs in your browser with FFmpeg WebAssembly and high-quality scale filters (Lanczos or bicubic). It does not use neural AI super-resolution, so it cannot invent missing detail the way model-based “AI video upscaler” products claim. For changing height or aspect without a fixed multiplier, use the resize video tool. For a longer walkthrough of free upscale workflows, settings, and 4K expectations, see the how-to guide on /blog/how-to-upscale-video-free-online-guide.

Video upscaler features

Upscale video free in the browser and download a larger MP4.

  • Upscale video online

    Upload MP4, MOV, or WebM and enlarge to 2×, 3×, or 4× with a long-edge safety cap.

  • Free video upscaler

    No signup and no server upload — process stays on your device.

  • Lanczos / bicubic quality

    Pick Fast, Balanced, or Quality scaling and tune CRF for sharper upscaled exports.

  • 4K-oriented scale

    Push small clips toward larger frames when the factor and cap allow (up to 3840px on the long edge).

  • MP4 download

    Export web-ready H.264 + AAC MP4 after upscaling.

  • Honest limits

    Classic resampling sharpens enlargement; it will not restore lost faces or textures like neural SR.

How to upscale a video for free

Upscale video online in three steps.

  1. Upload video

    Drop an MP4, MOV, or WebM file (up to 200 MB).

  2. Choose factor and quality

    Select 2×–4×, Fast / Balanced / Quality, and optional CRF.

  3. Upscale and download

    Click Upscale video, then save the larger MP4.

Tips for better upscales

Practical guidance when you upscale video free on this page.
  • 01

    Start with 2×

    2× is usually enough; 4× on noisy sources exaggerates soft edges.

  • 02

    Use Quality + lower CRF

    When detail matters, choose Quality and keep CRF near 18–20.

  • 03

    Short clips first

    Browser upscaling is CPU-heavy — trim long files before a 3× or 4× pass.

  • 04

    Need exact height?

    If you need 1080p or 9:16 framing instead of a multiplier, use /resize-video.

  • 05

    Read the full free-upscale guide

    Settings, size math, and classic vs AI tradeoffs: /blog/how-to-upscale-video-free-online-guide.

Great for

Common free upscale-video scenarios.

  • Small camera clips

    Enlarge phone or webcam footage before editing or uploading.

  • Legacy SD / 720p files

    Bring older exports closer to modern timeline resolutions.

  • Social remasters

    Upscale a short clip when a platform expects a larger frame.

  • Private local work

    Keep sensitive footage on-device instead of cloud AI uploaders.

Sources & References

References on video scaling algorithms, H.264 encoding, and local browser file handling.
  • “Scale (resize) the input video, either to a required size or using an algorithm selected by flags such as lanczos.”
    — FFmpeg Filters Documentation — scale

    FFmpeg scale filter: This video upscaler enlarges frames with FFmpeg’s scale filter (Lanczos or bicubic), then re-encodes locally in the browser. ffmpeg.org/ffmpeg-filters.html#scale-1

  • “The FFmpeg rescaler provides high-quality software video scaling and pixel format conversion.”
    — FFmpeg Scaler Documentation

    FFmpeg scaler (libswscale): Lanczos and bicubic options here map to libswscale algorithms used when you upscale a video for free on this page. ffmpeg.org/ffmpeg-scaler.html

  • “Advanced Video Coding (AVC), also referred to as H.264, is a video compression standard.”
    — Wikipedia — Advanced Video Coding

    H.264 / Advanced Video Coding: Upscaled output is written as H.264 MP4 so the larger frame stays playable on the web and in editors. en.wikipedia.org/wiki/Advanced_Video_Coding

  • “The File interface provides information about files and allows JavaScript in a web page to access their content.”
    — MDN Web Docs — File

    File API: Your clip is read as a local File and processed on-device; nothing is uploaded for upscaling. developer.mozilla.org/en-US/docs/Web/API/File

Frequently Asked Questions

Quick answers about this tool—open a question to read more.